> Hello.
>
> I have 2 forms (Form1 and Form2). When i call the Sub placed in form1 from
> form2, i get the error "object reference not set to an instance of an object"
> !
> What can i do to solve the problem?
>
> Thanks

"rowe_newsgroups" wrote:

> Please post the code that calls the sub.
>
> Thanks,
>
> Seth Rowe
>
> vitorjol wrote:
> > Hello.
> >
> > I have 2 forms (Form1 and Form2). When i call the Sub placed in form1 from
> > form2, i get the error "object reference not set to an instance of an object"
> > !
> > What can i do to solve the problem?
> >
> > Thanks
>
>

> Here is the code:
>
> ' the code in form2
> Private Sub DataGridView1_RowHeaderMouseClick(ByVal sender As Object, ByVal
> e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles
> DataGridView1.RowHeaderMouseClick
>         dim exitvar as Integer
>         exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
>         Dim ff As New Form1
>         ff.BringToFront()
>         ff.soumavez(exitvar) ' this is the call to the sub in Form1
>     End Sub
>
> "rowe_newsgroups" wrote:
>
> > Please post the code that calls the sub.
> >
> > Thanks,
> >
> > Seth Rowe
> >
> > vitorjol wrote:
> > > Hello.
> > >
> > > I have 2 forms (Form1 and Form2). When i call the Sub placed in form1 from
> > > form2, i get the error "object reference not set to an instance of an object"
> > > !
> > > What can i do to solve the problem?
> > >
> > > Thanks
> >
> >

"rowe_newsgroups" wrote:

> Looks like it should work, when you step through the code where does
> the exception occur?  If the error occurs in somewhere other than this
> sub please post that code too. Also what does "soumavez" mean?
>
> Thanks,
>
> Seth Rowe
>
>
> vitorjol wrote:
> > Here is the code:
> >
> > ' the code in form2
> > Private Sub DataGridView1_RowHeaderMouseClick(ByVal sender As Object, ByVal
> > e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles
> > DataGridView1.RowHeaderMouseClick
> >         dim exitvar as Integer
> >         exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
> >         Dim ff As New Form1
> >         ff.BringToFront()
> >         ff.soumavez(exitvar) ' this is the call to the sub in Form1
> >     End Sub
> >
> > "rowe_newsgroups" wrote:
> >
> > > Please post the code that calls the sub.
> > >
> > > Thanks,
> > >
> > > Seth Rowe
> > >
> > > vitorjol wrote:
> > > > Hello.
> > > >
> > > > I have 2 forms (Form1 and Form2). When i call the Sub placed in form1 from
> > > > form2, i get the error "object reference not set to an instance of an object"
> > > > !
> > > > What can i do to solve the problem?
> > > >
> > > > Thanks
> > >
> > >
>
>

>
> i put here the code of Sub(its about the Mapguide ActiveX to show a map in
> VB). I'll send there to Sub in the other form the id of a polygon on the map,
> and then the Sub localize the polygon and zoom the place!!!
>
> Code of the Sub "soumavez" in the Form1:
>
> Public Sub soumavez(ByVal varin As Integer)
> ' --->"varin" its the var that i send from Form2!!!
> ' --->"mgmap" its the name of the control (mapguide activex)
>         Try
>             Dim pubmapsel As MGMapControl.MGSelection
>             Dim pubvar2 As MGMapControl.MGMapLayer
>             Dim pubmapobjectos As MGMapControl.MGCollection
>             Dim pubmapobj As MGMapControl.MGMapObject
>             pubmapsel = mgmap.getSelection()
>             pubvar2 = mgmap.getMapLayer("SIG")
>             pubmapobjectos = mgmap.createObject("MGCollection")
>             pubmapobj = pubvar2.getMapObject(varin)
>             pubmapobjectos.add(pubmapobj)
>             pubmapsel.addObjectsEx(pubmapobjectos, False)
>             mgmap.zoomSelected()
>             mgmap.zoomScale(mgmap.getLat(), mgmap.getLon(), 1500)
>             mgmap.refresh()
>         Catch ex As Exception
>             MessageBox.Show(ex.Message, "Erro", MessageBoxButtons.OK,
> MessageBoxIcon.Error)
>         End Try
>  End Sub
>
>
> "rowe_newsgroups" wrote:
>
> > Looks like it should work, when you step through the code where does
> > the exception occur?  If the error occurs in somewhere other than this
> > sub please post that code too. Also what does "soumavez" mean?
> >
> > Thanks,
> >
> > Seth Rowe
> >
> >
> > vitorjol wrote:
> > > Here is the code:
> > >
> > > ' the code in form2
> > > Private Sub DataGridView1_RowHeaderMouseClick(ByVal sender As Object, ByVal
> > > e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles
> > > DataGridView1.RowHeaderMouseClick
> > >         dim exitvar as Integer
> > >         exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
> > >         Dim ff As New Form1
> > >         ff.BringToFront()
> > >         ff.soumavez(exitvar) ' this is the call to the sub in Form1
> > >     End Sub
> > >
> > > "rowe_newsgroups" wrote:
> > >
> > > > Please post the code that calls the sub.
> > > >
> > > > Thanks,
> > > >
> > > > Seth Rowe
> > > >
> > > > vitorjol wrote:
> > > > > Hello.
> > > > >
> > > > > I have 2 forms (Form1 and Form2). When i call the Sub placed in form1 from
> > > > > form2, i get the error "object reference not set to an instance of an object"
> > > > > !
> > > > > What can i do to solve the problem?
> > > > >
> > > > > Thanks
> > > >
> > > >
> >
> >

"rowe_newsgroups" wrote:

> > ok....the name "soumavez" its a name that i called to the Sub...End Sub.
>
> It looked like a foreign langauge to me (is it?), so I was just making
> sure it was a protected keyword in a foreign language edition of visual
> studio.
>
> Anyways, I have to apologize - my "visual" debugging skills must be
> lacking today, as I still don't see anything obviously wrong. Which
> line of the code raises the exception?
>
> Thanks,
>
> Seth Rowe
>
>
> vitorjol wrote:
>
> >
> > i put here the code of Sub(its about the Mapguide ActiveX to show a map in
> > VB). I'll send there to Sub in the other form the id of a polygon on the map,
> > and then the Sub localize the polygon and zoom the place!!!
> >
> > Code of the Sub "soumavez" in the Form1:
> >
> > Public Sub soumavez(ByVal varin As Integer)
> > ' --->"varin" its the var that i send from Form2!!!
> > ' --->"mgmap" its the name of the control (mapguide activex)
> >         Try
> >             Dim pubmapsel As MGMapControl.MGSelection
> >             Dim pubvar2 As MGMapControl.MGMapLayer
> >             Dim pubmapobjectos As MGMapControl.MGCollection
> >             Dim pubmapobj As MGMapControl.MGMapObject
> >             pubmapsel = mgmap.getSelection()
> >             pubvar2 = mgmap.getMapLayer("SIG")
> >             pubmapobjectos = mgmap.createObject("MGCollection")
> >             pubmapobj = pubvar2.getMapObject(varin)
> >             pubmapobjectos.add(pubmapobj)
> >             pubmapsel.addObjectsEx(pubmapobjectos, False)
> >             mgmap.zoomSelected()
> >             mgmap.zoomScale(mgmap.getLat(), mgmap.getLon(), 1500)
> >             mgmap.refresh()
> >         Catch ex As Exception
> >             MessageBox.Show(ex.Message, "Erro", MessageBoxButtons.OK,
> > MessageBoxIcon.Error)
> >         End Try
> >  End Sub
> >
> >
> > "rowe_newsgroups" wrote:
> >
> > > Looks like it should work, when you step through the code where does
> > > the exception occur?  If the error occurs in somewhere other than this
> > > sub please post that code too. Also what does "soumavez" mean?
> > >
> > > Thanks,
> > >
> > > Seth Rowe
> > >
> > >
> > > vitorjol wrote:
> > > > Here is the code:
> > > >
> > > > ' the code in form2
> > > > Private Sub DataGridView1_RowHeaderMouseClick(ByVal sender As Object, ByVal
> > > > e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles
> > > > DataGridView1.RowHeaderMouseClick
> > > >         dim exitvar as Integer
> > > >         exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
> > > >         Dim ff As New Form1
> > > >         ff.BringToFront()
> > > >         ff.soumavez(exitvar) ' this is the call to the sub in Form1
> > > >     End Sub
> > > >
> > > > "rowe_newsgroups" wrote:
> > > >
> > > > > Please post the code that calls the sub.
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Seth Rowe
> > > > >
> > > > > vitorjol wrote:
> > > > > > Hello.
> > > > > >
> > > > > > I have 2 forms (Form1 and Form2). When i call the Sub placed in form1 from
> > > > > > form2, i get the error "object reference not set to an instance of an object"
> > > > > > !
> > > > > > What can i do to solve the problem?
> > > > > >
> > > > > > Thanks
> > > > >
> > > > >
> > >
> > >
>
>

> Yes....im portuguese....but I love America!!!!!
>
> i forgot to tell U the line with the problem!!!Sorry
>
> So, the problem "object reference not set to an instance of an object"
> occurs in the line >>pubmapobj = pubvar2.getMapObject(varin)
>
> Thanks
>
>
> "rowe_newsgroups" wrote:
>
> > > ok....the name "soumavez" its a name that i called to the Sub...End Sub.
> >
> > It looked like a foreign langauge to me (is it?), so I was just making
> > sure it was a protected keyword in a foreign language edition of visual
> > studio.
> >
> > Anyways, I have to apologize - my "visual" debugging skills must be
> > lacking today, as I still don't see anything obviously wrong. Which
> > line of the code raises the exception?
> >
> > Thanks,
> >
> > Seth Rowe
> >
> >
> > vitorjol wrote:
> >
> > >
> > > i put here the code of Sub(its about the Mapguide ActiveX to show a map in
> > > VB). I'll send there to Sub in the other form the id of a polygon on the map,
> > > and then the Sub localize the polygon and zoom the place!!!
> > >
> > > Code of the Sub "soumavez" in the Form1:
> > >
> > > Public Sub soumavez(ByVal varin As Integer)
> > > ' --->"varin" its the var that i send from Form2!!!
> > > ' --->"mgmap" its the name of the control (mapguide activex)
> > >         Try
> > >             Dim pubmapsel As MGMapControl.MGSelection
> > >             Dim pubvar2 As MGMapControl.MGMapLayer
> > >             Dim pubmapobjectos As MGMapControl.MGCollection
> > >             Dim pubmapobj As MGMapControl.MGMapObject
> > >             pubmapsel = mgmap.getSelection()
> > >             pubvar2 = mgmap.getMapLayer("SIG")
> > >             pubmapobjectos = mgmap.createObject("MGCollection")
> > >             pubmapobj = pubvar2.getMapObject(varin)
> > >             pubmapobjectos.add(pubmapobj)
> > >             pubmapsel.addObjectsEx(pubmapobjectos, False)
> > >             mgmap.zoomSelected()
> > >             mgmap.zoomScale(mgmap.getLat(), mgmap.getLon(), 1500)
> > >             mgmap.refresh()
> > >         Catch ex As Exception
> > >             MessageBox.Show(ex.Message, "Erro", MessageBoxButtons.OK,
> > > MessageBoxIcon.Error)
> > >         End Try
> > >  End Sub
> > >
> > >
> > > "rowe_newsgroups" wrote:
> > >
> > > > Looks like it should work, when you step through the code where does
> > > > the exception occur?  If the error occurs in somewhere other than this
> > > > sub please post that code too. Also what does "soumavez" mean?
> > > >
> > > > Thanks,
> > > >
> > > > Seth Rowe
> > > >
> > > >
> > > > vitorjol wrote:
> > > > > Here is the code:
> > > > >
> > > > > ' the code in form2
> > > > > Private Sub DataGridView1_RowHeaderMouseClick(ByVal sender As Object, ByVal
> > > > > e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles
> > > > > DataGridView1.RowHeaderMouseClick
> > > > >         dim exitvar as Integer
> > > > >         exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
> > > > >         Dim ff As New Form1
> > > > >         ff.BringToFront()
> > > > >         ff.soumavez(exitvar) ' this is the call to the sub in Form1
> > > > >     End Sub
> > > > >
> > > > > "rowe_newsgroups" wrote:
> > > > >
> > > > > > Please post the code that calls the sub.
> > > > > >
> > > > > > Thanks,
> > > > > >
> > > > > > Seth Rowe
> > > > > >
> > > > > > vitorjol wrote:
> > > > > > > Hello.
> > > > > > >
> > > > > > > I have 2 forms (Form1 and Form2). When i call the Sub placed in form1 from
> > > > > > > form2, i get the error "object reference not set to an instance of an object"
> > > > > > > !
> > > > > > > What can i do to solve the problem?
> > > > > > >
> > > > > > > Thanks
> > > > > >
> > > > > >
> > > >
> > > >
> >
> >

> Hmm. The "object reference not set to an instance of an object"
> exception is raised when you try to use an object that doesn't exist
> yet, like if you left out the New keyword. However, everything looks
> alright to me. The only thing I would try (outside of praying that
> someone else happens on this thread and sees what we're missing!) is
> to change this line:
>
>> pubmapobj = pubvar2.getMapObject(varin)
>>
> To this:
>
> pubmapobj = MGMapControl.MGMapLayer.getMapObject(varin)
>
> That will take the pubvar2 variable out of the equation. Note, you may
> also try throwing  the "New" keyword into that line, I'm not sure if
> you do or don't need it.
>
> Hope that helps,
>
> Seth Rowe
>
> vitorjol wrote:
>
>> Yes....im portuguese....but I love America!!!!!
>>
>> i forgot to tell U the line with the problem!!!Sorry
>>
>> So, the problem "object reference not set to an instance of an
>> object" occurs in the line >>pubmapobj = pubvar2.getMapObject(varin)
>>
>> Thanks
>>
>> "rowe_newsgroups" wrote:
>>
>>>> ok....the name "soumavez" its a name that i called to the Sub...End
>>>> Sub.
>>>>
>>> It looked like a foreign langauge to me (is it?), so I was just
>>> making sure it was a protected keyword in a foreign language edition
>>> of visual studio.
>>>
>>> Anyways, I have to apologize - my "visual" debugging skills must be
>>> lacking today, as I still don't see anything obviously wrong. Which
>>> line of the code raises the exception?
>>>
>>> Thanks,
>>>
>>> Seth Rowe
>>>
>>> vitorjol wrote:
>>>
>>>> i put here the code of Sub(its about the Mapguide ActiveX to show a
>>>> map in VB). I'll send there to Sub in the other form the id of a
>>>> polygon on the map, and then the Sub localize the polygon and zoom
>>>> the place!!!
>>>>
>>>> Code of the Sub "soumavez" in the Form1:
>>>>
>>>> Public Sub soumavez(ByVal varin As Integer)
>>>> ' --->"varin" its the var that i send from Form2!!!
>>>> ' --->"mgmap" its the name of the control (mapguide activex)
>>>> Try
>>>> Dim pubmapsel As MGMapControl.MGSelection
>>>> Dim pubvar2 As MGMapControl.MGMapLayer
>>>> Dim pubmapobjectos As MGMapControl.MGCollection
>>>> Dim pubmapobj As MGMapControl.MGMapObject
>>>> pubmapsel = mgmap.getSelection()
>>>> pubvar2 = mgmap.getMapLayer("SIG")
>>>> pubmapobjectos = mgmap.createObject("MGCollection")
>>>> pubmapobj = pubvar2.getMapObject(varin)
>>>> pubmapobjectos.add(pubmapobj)
>>>> pubmapsel.addObjectsEx(pubmapobjectos, False)
>>>> mgmap.zoomSelected()
>>>> mgmap.zoomScale(mgmap.getLat(), mgmap.getLon(), 1500)
>>>> mgmap.refresh()
>>>> Catch ex As Exception
>>>> MessageBox.Show(ex.Message, "Erro", MessageBoxButtons.OK,
>>>> MessageBoxIcon.Error)
>>>> End Try
>>>> End Sub
>>>> "rowe_newsgroups" wrote:
>>>>
>>>>> Looks like it should work, when you step through the code where
>>>>> does the exception occur?  If the error occurs in somewhere other
>>>>> than this sub please post that code too. Also what does "soumavez"
>>>>> mean?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Seth Rowe
>>>>>
>>>>> vitorjol wrote:
>>>>>
>>>>>> Here is the code:
>>>>>>
>>>>>> ' the code in form2
>>>>>> Private Sub DataGridView1_RowHeaderMouseClick(ByVal sender As
>>>>>> Object, ByVal
>>>>>> e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles
>>>>>> DataGridView1.RowHeaderMouseClick
>>>>>> dim exitvar as Integer
>>>>>> exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
>>>>>> Dim ff As New Form1
>>>>>> ff.BringToFront()
>>>>>> ff.soumavez(exitvar) ' this is the call to the sub in Form1
>>>>>> End Sub
>>>>>> "rowe_newsgroups" wrote:
>>>>>>
>>>>>>> Please post the code that calls the sub.
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Seth Rowe
>>>>>>>
>>>>>>> vitorjol wrote:
>>>>>>>
>>>>>>>> Hello.
>>>>>>>>
>>>>>>>> I have 2 forms (Form1 and Form2). When i call the Sub placed in
>>>>>>>> form1 from
>>>>>>>> form2, i get the error "object reference not set to an instance
>>>>>>>> of an object"
>>>>>>>> !
>>>>>>>> What can i do to solve the problem?
>>>>>>>> Thanks
>>>>>>>>

"Daniel Bloch" wrote:

>
> Daniel Bloch schrieb:
>
> > What I see is that you do not show the form BringToFront does not make
> > a control a top-level control, and it does not raise the Paint event.
> >
> > So with the knowledge of the last post, try following
> >
> > - Check, if you can run the sub from form2 alone. Implement a button to
> > show what you want and make a test like this.
> > - If this does not work, first correct the sub until you are able to
> > let it run.
> > - After that, first show the new form and then let sub run from
> > form1...
> >
> > Daniel
>
> Sorry, I did a mistake and mixed form1 and form2 :)
>
>

"vitorjol" wrote:

> The SUB in form2:
>
> Public Sub soumavez(ByVal varin As Integer)
>         Try
>             MessageBox.Show(varin)                                         
>             Dim pubmapsel As MGMapControl.MGSelection          
>             Dim pubvar2 As MGMapControl.MGMapLayer             
>             Dim pubmapobjectos As MGMapControl.MGCollection
>             Dim pubmapobj As MGMapControl.MGMapObject
>             pubmapsel = mgmap.getSelection()
>             pubvar2 = mgmap.getMapLayer("SIG")
>             pubmapobjectos = mgmap.createObject("MGCollection")
>             pubmapobj = mgmap.getMapLayer("SIG").getMapObject(varin)
>             pubmapobjectos.add(pubmapobj)
>             mgmap.getSelection().addObjectsEx(pubmapobjectos, False)
>             mgmap.zoomSelected()
>             mgmap.zoomScale(mgmap.getLat(), mgmap.getLon(), 1500)
>             mgmap.refresh()
>         Catch ex As Exception
>             MessageBox.Show(ex.Message, "Erro", MessageBoxButtons.OK,
> MessageBoxIcon.Error)
>         End Try
>
> End Sub
>
>
> this sub is called form Form2 with the following code:
>
>         exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
>         Dim ff As New Form1
>         ff.BringToFront()
>         ff.soumavez(exitvar)
>
> PROBLEM:
>
> if i dont put the codeline "MessageBox.Show(varin)", occurs the error at
> line "pubmapobj = mgmap.getMapLayer("SIG").getMapObject(varin)".
> If i put the message "MessageBox.Show(varin)", occurs the error at line
> "mgmap.getSelection().addObjectsEx(pubmapobjectos, False)".
>
> the test that u say to do (call the sub from a buttonclick within Form1)
> occurs with NO Error!!!!
>
> Thanks
>
> "Daniel Bloch" wrote:
>
> >
> > Daniel Bloch schrieb:
> >
> > > What I see is that you do not show the form BringToFront does not make
> > > a control a top-level control, and it does not raise the Paint event.
> > >
> > > So with the knowledge of the last post, try following
> > >
> > > - Check, if you can run the sub from form2 alone. Implement a button to
> > > show what you want and make a test like this.
> > > - If this does not work, first correct the sub until you are able to
> > > let it run.
> > > - After that, first show the new form and then let sub run from
> > > form1...
> > >
> > > Daniel
> >
> > Sorry, I did a mistake and mixed form1 and form2 :)
> >
> >

"Daniel Bloch" wrote:

> Now, have you tried to first SHOW the document with the command "show"
> before let running the sub.
>
> I realy believe that your problem just occurs because there is no valid
> form available (because it's not yet shown and has it's window handle)
> that can take the form handlings of your map software ...
>
> Daniel
>
>

"Daniel Bloch" wrote:

> Have you tried?
>
> Sometimes, software development is not about thinking but about trying.
> So give it a try and place a ".show" instead of ".bringtofront" and
> check out, what happens.
>
> Daniel
>
>

> it opens again the form1....i dont want this, and dont work anyway!!!
> i think that i solved the problem. In form1 i open the form2 with the
> command showdialog...just this!!!
>
> "Daniel Bloch" wrote:
>
> > Have you tried?
> >
> > Sometimes, software development is not about thinking but about trying.
> > So give it a try and place a ".show" instead of ".bringtofront" and
> > check out, what happens.
> >
> > Daniel
> >
> >

> Hello rowe_newsgroups,
>
> Your solutuion would not work.  MGMapControl is the namespace.. MGMapLayer
> is the type.  getMapObject is not static (shared).
> pubvar2 (GEEZ!  Use some better freakin names next time wouldja, OP!) is
> supposed to grab a reference to a specific map layer.
>
> You are correct in that the OP is trying to use an object that is null.
>
> OP:  Check your MWF, make sure you have a layer actually called "SIG".  Also,
> ZoomSelected is a terrible way to get to an object.  First, the selection
> will only succeed if the object is visible at your current zoom scale.  Second,
> MapGuide is notorious for busystate collisions.
>
> -Boo
>
> > Hmm. The "object reference not set to an instance of an object"
> > exception is raised when you try to use an object that doesn't exist
> > yet, like if you left out the New keyword. However, everything looks
> > alright to me. The only thing I would try (outside of praying that
> > someone else happens on this thread and sees what we're missing!) is
> > to change this line:
> >
> >> pubmapobj = pubvar2.getMapObject(varin)
> >>
> > To this:
> >
> > pubmapobj = MGMapControl.MGMapLayer.getMapObject(varin)
> >
> > That will take the pubvar2 variable out of the equation. Note, you may
> > also try throwing  the "New" keyword into that line, I'm not sure if
> > you do or don't need it.
> >
> > Hope that helps,
> >
> > Seth Rowe
> >
> > vitorjol wrote:
> >
> >> Yes....im portuguese....but I love America!!!!!
> >>
> >> i forgot to tell U the line with the problem!!!Sorry
> >>
> >> So, the problem "object reference not set to an instance of an
> >> object" occurs in the line >>pubmapobj = pubvar2.getMapObject(varin)
> >>
> >> Thanks
> >>
> >> "rowe_newsgroups" wrote:
> >>
> >>>> ok....the name "soumavez" its a name that i called to the Sub...End
> >>>> Sub.
> >>>>
> >>> It looked like a foreign langauge to me (is it?), so I was just
> >>> making sure it was a protected keyword in a foreign language edition
> >>> of visual studio.
> >>>
> >>> Anyways, I have to apologize - my "visual" debugging skills must be
> >>> lacking today, as I still don't see anything obviously wrong. Which
> >>> line of the code raises the exception?
> >>>
> >>> Thanks,
> >>>
> >>> Seth Rowe
> >>>
> >>> vitorjol wrote:
> >>>
> >>>> i put here the code of Sub(its about the Mapguide ActiveX to show a
> >>>> map in VB). I'll send there to Sub in the other form the id of a
> >>>> polygon on the map, and then the Sub localize the polygon and zoom
> >>>> the place!!!
> >>>>
> >>>> Code of the Sub "soumavez" in the Form1:
> >>>>
> >>>> Public Sub soumavez(ByVal varin As Integer)
> >>>> ' --->"varin" its the var that i send from Form2!!!
> >>>> ' --->"mgmap" its the name of the control (mapguide activex)
> >>>> Try
> >>>> Dim pubmapsel As MGMapControl.MGSelection
> >>>> Dim pubvar2 As MGMapControl.MGMapLayer
> >>>> Dim pubmapobjectos As MGMapControl.MGCollection
> >>>> Dim pubmapobj As MGMapControl.MGMapObject
> >>>> pubmapsel = mgmap.getSelection()
> >>>> pubvar2 = mgmap.getMapLayer("SIG")
> >>>> pubmapobjectos = mgmap.createObject("MGCollection")
> >>>> pubmapobj = pubvar2.getMapObject(varin)
> >>>> pubmapobjectos.add(pubmapobj)
> >>>> pubmapsel.addObjectsEx(pubmapobjectos, False)
> >>>> mgmap.zoomSelected()
> >>>> mgmap.zoomScale(mgmap.getLat(), mgmap.getLon(), 1500)
> >>>> mgmap.refresh()
> >>>> Catch ex As Exception
> >>>> MessageBox.Show(ex.Message, "Erro", MessageBoxButtons.OK,
> >>>> MessageBoxIcon.Error)
> >>>> End Try
> >>>> End Sub
> >>>> "rowe_newsgroups" wrote:
> >>>>
> >>>>> Looks like it should work, when you step through the code where
> >>>>> does the exception occur?  If the error occurs in somewhere other
> >>>>> than this sub please post that code too. Also what does "soumavez"
> >>>>> mean?
> >>>>>
> >>>>> Thanks,
> >>>>>
> >>>>> Seth Rowe
> >>>>>
> >>>>> vitorjol wrote:
> >>>>>
> >>>>>> Here is the code:
> >>>>>>
> >>>>>> ' the code in form2
> >>>>>> Private Sub DataGridView1_RowHeaderMouseClick(ByVal sender As
> >>>>>> Object, ByVal
> >>>>>> e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles
> >>>>>> DataGridView1.RowHeaderMouseClick
> >>>>>> dim exitvar as Integer
> >>>>>> exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
> >>>>>> Dim ff As New Form1
> >>>>>> ff.BringToFront()
> >>>>>> ff.soumavez(exitvar) ' this is the call to the sub in Form1
> >>>>>> End Sub
> >>>>>> "rowe_newsgroups" wrote:
> >>>>>>
> >>>>>>> Please post the code that calls the sub.
> >>>>>>>
> >>>>>>> Thanks,
> >>>>>>>
> >>>>>>> Seth Rowe
> >>>>>>>
> >>>>>>> vitorjol wrote:
> >>>>>>>
> >>>>>>>> Hello.
> >>>>>>>>
> >>>>>>>> I have 2 forms (Form1 and Form2). When i call the Sub placed in
> >>>>>>>> form1 from
> >>>>>>>> form2, i get the error "object reference not set to an instance
> >>>>>>>> of an object"
> >>>>>>>> !
> >>>>>>>> What can i do to solve the problem?
> >>>>>>>> Thanks
> >>>>>>>>

> Thanks for coming to my rescue here Ghost, with no experience using
> Mapguide (and not having it's SDK) I was getting in over my head!
>
> Thanks,
>
> Seth Rowe
>
> GhostInAK wrote:
>
>> Hello rowe_newsgroups,
>>
>> Your solutuion would not work.  MGMapControl is the namespace..
>> MGMapLayer
>> is the type.  getMapObject is not static (shared).
>> pubvar2 (GEEZ!  Use some better freakin names next time wouldja, OP!)
>> is
>> supposed to grab a reference to a specific map layer.
>> You are correct in that the OP is trying to use an object that is
>> null.
>>
>> OP:  Check your MWF, make sure you have a layer actually called
>> "SIG".  Also,
>> ZoomSelected is a terrible way to get to an object.  First, the
>> selection
>> will only succeed if the object is visible at your current zoom
>> scale.  Second,
>> MapGuide is notorious for busystate collisions.
>> -Boo
>>
>>> Hmm. The "object reference not set to an instance of an object"
>>> exception is raised when you try to use an object that doesn't exist
>>> yet, like if you left out the New keyword. However, everything looks
>>> alright to me. The only thing I would try (outside of praying that
>>> someone else happens on this thread and sees what we're missing!) is
>>> to change this line:
>>>
>>>> pubmapobj = pubvar2.getMapObject(varin)
>>>>
>>> To this:
>>>
>>> pubmapobj = MGMapControl.MGMapLayer.getMapObject(varin)
>>>
>>> That will take the pubvar2 variable out of the equation. Note, you
>>> may also try throwing  the "New" keyword into that line, I'm not
>>> sure if you do or don't need it.
>>>
>>> Hope that helps,
>>>
>>> Seth Rowe
>>>
>>> vitorjol wrote:
>>>
>>>> Yes....im portuguese....but I love America!!!!!
>>>>
>>>> i forgot to tell U the line with the problem!!!Sorry
>>>>
>>>> So, the problem "object reference not set to an instance of an
>>>> object" occurs in the line >>pubmapobj =
>>>> pubvar2.getMapObject(varin)
>>>>
>>>> Thanks
>>>>
>>>> "rowe_newsgroups" wrote:
>>>>
>>>>>> ok....the name "soumavez" its a name that i called to the
>>>>>> Sub...End Sub.
>>>>>>
>>>>> It looked like a foreign langauge to me (is it?), so I was just
>>>>> making sure it was a protected keyword in a foreign language
>>>>> edition of visual studio.
>>>>>
>>>>> Anyways, I have to apologize - my "visual" debugging skills must
>>>>> be lacking today, as I still don't see anything obviously wrong.
>>>>> Which line of the code raises the exception?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Seth Rowe
>>>>>
>>>>> vitorjol wrote:
>>>>>
>>>>>> i put here the code of Sub(its about the Mapguide ActiveX to show
>>>>>> a map in VB). I'll send there to Sub in the other form the id of
>>>>>> a polygon on the map, and then the Sub localize the polygon and
>>>>>> zoom the place!!!
>>>>>>
>>>>>> Code of the Sub "soumavez" in the Form1:
>>>>>>
>>>>>> Public Sub soumavez(ByVal varin As Integer)
>>>>>> ' --->"varin" its the var that i send from Form2!!!
>>>>>> ' --->"mgmap" its the name of the control (mapguide activex)
>>>>>> Try
>>>>>> Dim pubmapsel As MGMapControl.MGSelection
>>>>>> Dim pubvar2 As MGMapControl.MGMapLayer
>>>>>> Dim pubmapobjectos As MGMapControl.MGCollection
>>>>>> Dim pubmapobj As MGMapControl.MGMapObject
>>>>>> pubmapsel = mgmap.getSelection()
>>>>>> pubvar2 = mgmap.getMapLayer("SIG")
>>>>>> pubmapobjectos = mgmap.createObject("MGCollection")
>>>>>> pubmapobj = pubvar2.getMapObject(varin)
>>>>>> pubmapobjectos.add(pubmapobj)
>>>>>> pubmapsel.addObjectsEx(pubmapobjectos, False)
>>>>>> mgmap.zoomSelected()
>>>>>> mgmap.zoomScale(mgmap.getLat(), mgmap.getLon(), 1500)
>>>>>> mgmap.refresh()
>>>>>> Catch ex As Exception
>>>>>> MessageBox.Show(ex.Message, "Erro", MessageBoxButtons.OK,
>>>>>> MessageBoxIcon.Error)
>>>>>> End Try
>>>>>> End Sub
>>>>>> "rowe_newsgroups" wrote:
>>>>>>> Looks like it should work, when you step through the code where
>>>>>>> does the exception occur?  If the error occurs in somewhere
>>>>>>> other than this sub please post that code too. Also what does
>>>>>>> "soumavez" mean?
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Seth Rowe
>>>>>>>
>>>>>>> vitorjol wrote:
>>>>>>>
>>>>>>>> Here is the code:
>>>>>>>>
>>>>>>>> ' the code in form2
>>>>>>>> Private Sub DataGridView1_RowHeaderMouseClick(ByVal sender As
>>>>>>>> Object, ByVal
>>>>>>>> e As System.Windows.Forms.DataGridViewCellMouseEventArgs)
>>>>>>>> Handles
>>>>>>>> DataGridView1.RowHeaderMouseClick
>>>>>>>> dim exitvar as Integer
>>>>>>>> exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
>>>>>>>> Dim ff As New Form1
>>>>>>>> ff.BringToFront()
>>>>>>>> ff.soumavez(exitvar) ' this is the call to the sub in Form1
>>>>>>>> End Sub
>>>>>>>> "rowe_newsgroups" wrote:
>>>>>>>>> Please post the code that calls the sub.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>>
>>>>>>>>> Seth Rowe
>>>>>>>>>
>>>>>>>>> vitorjol wrote:
>>>>>>>>>
>>>>>>>>>> Hello.
>>>>>>>>>>
>>>>>>>>>> I have 2 forms (Form1 and Form2). When i call the Sub placed
>>>>>>>>>> in
>>>>>>>>>> form1 from
>>>>>>>>>> form2, i get the error "object reference not set to an
>>>>>>>>>> instance
>>>>>>>>>> of an object"
>>>>>>>>>> !
>>>>>>>>>> What can i do to solve the problem?
>>>>>>>>>> Thanks

"GhostInAK" wrote:

> Hello rowe_newsgroups,
>
> I envy you, Seth.  I have to use the abismal peice of crap every day.
>
> -Boo
>
> > Thanks for coming to my rescue here Ghost, with no experience using
> > Mapguide (and not having it's SDK) I was getting in over my head!
> >
> > Thanks,
> >
> > Seth Rowe
> >
> > GhostInAK wrote:
> >
> >> Hello rowe_newsgroups,
> >>
> >> Your solutuion would not work.  MGMapControl is the namespace..
> >> MGMapLayer
> >> is the type.  getMapObject is not static (shared).
> >> pubvar2 (GEEZ!  Use some better freakin names next time wouldja, OP!)
> >> is
> >> supposed to grab a reference to a specific map layer.
> >> You are correct in that the OP is trying to use an object that is
> >> null.
> >>
> >> OP:  Check your MWF, make sure you have a layer actually called
> >> "SIG".  Also,
> >> ZoomSelected is a terrible way to get to an object.  First, the
> >> selection
> >> will only succeed if the object is visible at your current zoom
> >> scale.  Second,
> >> MapGuide is notorious for busystate collisions.
> >> -Boo
> >>
> >>> Hmm. The "object reference not set to an instance of an object"
> >>> exception is raised when you try to use an object that doesn't exist
> >>> yet, like if you left out the New keyword. However, everything looks
> >>> alright to me. The only thing I would try (outside of praying that
> >>> someone else happens on this thread and sees what we're missing!) is
> >>> to change this line:
> >>>
> >>>> pubmapobj = pubvar2.getMapObject(varin)
> >>>>
> >>> To this:
> >>>
> >>> pubmapobj = MGMapControl.MGMapLayer.getMapObject(varin)
> >>>
> >>> That will take the pubvar2 variable out of the equation. Note, you
> >>> may also try throwing  the "New" keyword into that line, I'm not
> >>> sure if you do or don't need it.
> >>>
> >>> Hope that helps,
> >>>
> >>> Seth Rowe
> >>>
> >>> vitorjol wrote:
> >>>
> >>>> Yes....im portuguese....but I love America!!!!!
> >>>>
> >>>> i forgot to tell U the line with the problem!!!Sorry
> >>>>
> >>>> So, the problem "object reference not set to an instance of an
> >>>> object" occurs in the line >>pubmapobj =
> >>>> pubvar2.getMapObject(varin)
> >>>>
> >>>> Thanks
> >>>>
> >>>> "rowe_newsgroups" wrote:
> >>>>
> >>>>>> ok....the name "soumavez" its a name that i called to the
> >>>>>> Sub...End Sub.
> >>>>>>
> >>>>> It looked like a foreign langauge to me (is it?), so I was just
> >>>>> making sure it was a protected keyword in a foreign language
> >>>>> edition of visual studio.
> >>>>>
> >>>>> Anyways, I have to apologize - my "visual" debugging skills must
> >>>>> be lacking today, as I still don't see anything obviously wrong.
> >>>>> Which line of the code raises the exception?
> >>>>>
> >>>>> Thanks,
> >>>>>
> >>>>> Seth Rowe
> >>>>>
> >>>>> vitorjol wrote:
> >>>>>
> >>>>>> i put here the code of Sub(its about the Mapguide ActiveX to show
> >>>>>> a map in VB). I'll send there to Sub in the other form the id of
> >>>>>> a polygon on the map, and then the Sub localize the polygon and
> >>>>>> zoom the place!!!
> >>>>>>
> >>>>>> Code of the Sub "soumavez" in the Form1:
> >>>>>>
> >>>>>> Public Sub soumavez(ByVal varin As Integer)
> >>>>>> ' --->"varin" its the var that i send from Form2!!!
> >>>>>> ' --->"mgmap" its the name of the control (mapguide activex)
> >>>>>> Try
> >>>>>> Dim pubmapsel As MGMapControl.MGSelection
> >>>>>> Dim pubvar2 As MGMapControl.MGMapLayer
> >>>>>> Dim pubmapobjectos As MGMapControl.MGCollection
> >>>>>> Dim pubmapobj As MGMapControl.MGMapObject
> >>>>>> pubmapsel = mgmap.getSelection()
> >>>>>> pubvar2 = mgmap.getMapLayer("SIG")
> >>>>>> pubmapobjectos = mgmap.createObject("MGCollection")
> >>>>>> pubmapobj = pubvar2.getMapObject(varin)
> >>>>>> pubmapobjectos.add(pubmapobj)
> >>>>>> pubmapsel.addObjectsEx(pubmapobjectos, False)
> >>>>>> mgmap.zoomSelected()
> >>>>>> mgmap.zoomScale(mgmap.getLat(), mgmap.getLon(), 1500)
> >>>>>> mgmap.refresh()
> >>>>>> Catch ex As Exception
> >>>>>> MessageBox.Show(ex.Message, "Erro", MessageBoxButtons.OK,
> >>>>>> MessageBoxIcon.Error)
> >>>>>> End Try
> >>>>>> End Sub
> >>>>>> "rowe_newsgroups" wrote:
> >>>>>>> Looks like it should work, when you step through the code where
> >>>>>>> does the exception occur?  If the error occurs in somewhere
> >>>>>>> other than this sub please post that code too. Also what does
> >>>>>>> "soumavez" mean?
> >>>>>>>
> >>>>>>> Thanks,
> >>>>>>>
> >>>>>>> Seth Rowe
> >>>>>>>
> >>>>>>> vitorjol wrote:
> >>>>>>>
> >>>>>>>> Here is the code:
> >>>>>>>>
> >>>>>>>> ' the code in form2
> >>>>>>>> Private Sub DataGridView1_RowHeaderMouseClick(ByVal sender As
> >>>>>>>> Object, ByVal
> >>>>>>>> e As System.Windows.Forms.DataGridViewCellMouseEventArgs)
> >>>>>>>> Handles
> >>>>>>>> DataGridView1.RowHeaderMouseClick
> >>>>>>>> dim exitvar as Integer
> >>>>>>>> exitvar = DataGridView1.Rows(e.RowIndex).Cells(0).Value
> >>>>>>>> Dim ff As New Form1
> >>>>>>>> ff.BringToFront()
> >>>>>>>> ff.soumavez(exitvar) ' this is the call to the sub in Form1
> >>>>>>>> End Sub
> >>>>>>>> "rowe_newsgroups" wrote:
> >>>>>>>>> Please post the code that calls the sub.
> >>>>>>>>>
> >>>>>>>>> Thanks,
> >>>>>>>>>
> >>>>>>>>> Seth Rowe
> >>>>>>>>>
> >>>>>>>>> vitorjol wrote:
> >>>>>>>>>
> >>>>>>>>>> Hello.
> >>>>>>>>>>
> >>>>>>>>>> I have 2 forms (Form1 and Form2). When i call the Sub placed
> >>>>>>>>>> in
> >>>>>>>>>> form1 from
> >>>>>>>>>> form2, i get the error "object reference not set to an
> >>>>>>>>>> instance
> >>>>>>>>>> of an object"
> >>>>>>>>>> !
> >>>>>>>>>> What can i do to solve the problem?
> >>>>>>>>>> Thanks
>
>
>