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Changing the text of a Command Button using SetWindowTextI am trying to change the text of a Command button using the Windows API Function SetWindowText, which I have declared as follows: <DllImport("User32")> _ Public Function SetWindowText(ByVal hWnd As IntPtr, ByVal lpString As String) As Boolean End Function To change the text I call the function as follows in the Load event of the form. SetWindowText(Me.Button1.Handle.ToInt32, "TEST") Nothing appears to happen however when I examine the Button using Spy++ it tells me the window has the text "TEST". When I change the text of a label as follows SetWindowText(Me.Label1.Handle.ToInt32, "TEST") it works as expected, i.e. the change is immediately visible I know of course that I can change the text of the button using the syntax Button1.Text="TEST" however my objective is to use SetWindowText as I want to change the text later in an external DLL. It looks to me like this may be a window update issue. I have tried invalidating the window and repainting it with no success. Can anyone help me out on this? Thanks in advance Joe <supp***@airetec.com> schrieb:
> I am trying to change the text of a Command button using the Windows Specify the character set in 'DllImport' and set it to 'Auto'.> API Function SetWindowText, which I have declared as follows: > > <DllImport("User32")> _ > Public Function SetWindowText(ByVal hWnd As IntPtr, ByVal > lpString As String) As Boolean > End Function > To change the text I call the function as follows in the Load event of Remove the '.ToInt32'.> the form. > SetWindowText(Me.Button1.Handle.ToInt32, "TEST") > Nothing appears to happen however when I examine the Button using Spy++ Maybe the reason is that .NET draws the button. You may want to test it > it tells me the window has the text "TEST". > > When I change the text of a label as follows > SetWindowText(Me.Label1.Handle.ToInt32, "TEST") > it works as expected, i.e. the change is immediately visible > It looks to me like this may be a window update issue. with native Win32 buttons and/or set the .NET button's 'FlatStyle' property to 'System'. -- M S Herfried K. Wagner M V P <URL:http://dotnet.mvps.org/> V B <URL:http://classicvb.org/petition/> Hi,
thanks for your help. I tried what you suggested, it worked when I set the .NET button's 'FlatStyle' property to 'System'. It is not an option for me to change the property however. Can I force .NET to redraw the button using a Windows API call? I have tried InvalidateRect and UpdateWindow without any luck. Regards Joe Herfried K. Wagner [MVP] schrieb: Show quoteHide quote > <supp***@airetec.com> schrieb: > > I am trying to change the text of a Command button using the Windows > > API Function SetWindowText, which I have declared as follows: > > > > <DllImport("User32")> _ > > Public Function SetWindowText(ByVal hWnd As IntPtr, ByVal > > lpString As String) As Boolean > > End Function > > Specify the character set in 'DllImport' and set it to 'Auto'. > > > To change the text I call the function as follows in the Load event of > > the form. > > SetWindowText(Me.Button1.Handle.ToInt32, "TEST") > > Remove the '.ToInt32'. > > > Nothing appears to happen however when I examine the Button using Spy++ > > it tells me the window has the text "TEST". > > > > When I change the text of a label as follows > > SetWindowText(Me.Label1.Handle.ToInt32, "TEST") > > it works as expected, i.e. the change is immediately visible > > > It looks to me like this may be a window update issue. > > Maybe the reason is that .NET draws the button. You may want to test it > with native Win32 buttons and/or set the .NET button's 'FlatStyle' property > to 'System'. > > -- > M S Herfried K. Wagner > M V P <URL:http://dotnet.mvps.org/> > V B <URL:http://classicvb.org/petition/> Hello supp***@airetec.com,
Why not simply pass the button as a parameter to your DLL ? -Boo Show quoteHide quote > Hi, > > thanks for your help. > > I tried what you suggested, it worked when I set the .NET button's > 'FlatStyle' property to 'System'. It is not an option for me to > change the property however. > > Can I force .NET to redraw the button using a Windows API call? I have > tried InvalidateRect and UpdateWindow without any luck. > > Regards > Joe > Herfried K. Wagner [MVP] schrieb: > >> <supp***@airetec.com> schrieb: >> >>> I am trying to change the text of a Command button using the Windows >>> API Function SetWindowText, which I have declared as follows: >>> >>> <DllImport("User32")> _ >>> Public Function SetWindowText(ByVal hWnd As IntPtr, ByVal >>> lpString As String) As Boolean >>> End Function >> Specify the character set in 'DllImport' and set it to 'Auto'. >> >>> To change the text I call the function as follows in the Load event >>> of >>> the form. >>> SetWindowText(Me.Button1.Handle.ToInt32, "TEST") >> Remove the '.ToInt32'. >> >>> Nothing appears to happen however when I examine the Button using >>> Spy++ it tells me the window has the text "TEST". >>> >>> When I change the text of a label as follows >>> SetWindowText(Me.Label1.Handle.ToInt32, "TEST") >>> it works as expected, i.e. the change is immediately visible >>> It looks to me like this may be a window update issue. >>> >> Maybe the reason is that .NET draws the button. You may want to test >> it with native Win32 buttons and/or set the .NET button's 'FlatStyle' >> property to 'System'. >> >> -- >> M S Herfried K. Wagner >> M V P <URL:http://dotnet.mvps.org/> >> V B <URL:http://classicvb.org/petition/> Hi,
that is how my DLL is supposed to work. It takes the window handle as a parameter and changes the text using the Windows API call SetWindowText. That doesn't work either though, so to localise the problem I simplified it to a direct call to SetWindowText in vb.net. Joe GhostInAK schrieb: Show quoteHide quote > Hello supp***@airetec.com, > > Why not simply pass the button as a parameter to your DLL ? > > -Boo > > > Hi, > > > > thanks for your help. > > > > I tried what you suggested, it worked when I set the .NET button's > > 'FlatStyle' property to 'System'. It is not an option for me to > > change the property however. > > > > Can I force .NET to redraw the button using a Windows API call? I have > > tried InvalidateRect and UpdateWindow without any luck. > > > > Regards > > Joe > > Herfried K. Wagner [MVP] schrieb: > > > >> <supp***@airetec.com> schrieb: > >> > >>> I am trying to change the text of a Command button using the Windows > >>> API Function SetWindowText, which I have declared as follows: > >>> > >>> <DllImport("User32")> _ > >>> Public Function SetWindowText(ByVal hWnd As IntPtr, ByVal > >>> lpString As String) As Boolean > >>> End Function > >> Specify the character set in 'DllImport' and set it to 'Auto'. > >> > >>> To change the text I call the function as follows in the Load event > >>> of > >>> the form. > >>> SetWindowText(Me.Button1.Handle.ToInt32, "TEST") > >> Remove the '.ToInt32'. > >> > >>> Nothing appears to happen however when I examine the Button using > >>> Spy++ it tells me the window has the text "TEST". > >>> > >>> When I change the text of a label as follows > >>> SetWindowText(Me.Label1.Handle.ToInt32, "TEST") > >>> it works as expected, i.e. the change is immediately visible > >>> It looks to me like this may be a window update issue. > >>> > >> Maybe the reason is that .NET draws the button. You may want to test > >> it with native Win32 buttons and/or set the .NET button's 'FlatStyle' > >> property to 'System'. > >> > >> -- > >> M S Herfried K. Wagner > >> M V P <URL:http://dotnet.mvps.org/> > >> V B <URL:http://classicvb.org/petition/> Joe,
Is there a reason you need to use SetWindowText as opposed to simply using Control.Text? | Can I force .NET to redraw the button using a Windows API call? I have I'm not certain, however I would question the need to, as Control.Text | tried InvalidateRect and UpdateWindow without any luck. causes the button to be redrawn... -- Show quoteHide quoteHope this helps Jay B. Harlow [MVP - Outlook] ..NET Application Architect, Enthusiast, & Evangelist T.S. Bradley - http://www.tsbradley.net <supp***@airetec.com> wrote in message news:1157139501.091271.88450@74g2000cwt.googlegroups.com... | Hi, | | thanks for your help. | | I tried what you suggested, it worked when I set the .NET button's | 'FlatStyle' property to 'System'. It is not an option for me to | change the property however. | | Can I force .NET to redraw the button using a Windows API call? I have | tried InvalidateRect and UpdateWindow without any luck. | | Regards | Joe | | Herfried K. Wagner [MVP] schrieb: | | > <supp***@airetec.com> schrieb: | > > I am trying to change the text of a Command button using the Windows | > > API Function SetWindowText, which I have declared as follows: | > > | > > <DllImport("User32")> _ | > > Public Function SetWindowText(ByVal hWnd As IntPtr, ByVal | > > lpString As String) As Boolean | > > End Function | > | > Specify the character set in 'DllImport' and set it to 'Auto'. | > | > > To change the text I call the function as follows in the Load event of | > > the form. | > > SetWindowText(Me.Button1.Handle.ToInt32, "TEST") | > | > Remove the '.ToInt32'. | > | > > Nothing appears to happen however when I examine the Button using Spy++ | > > it tells me the window has the text "TEST". | > > | > > When I change the text of a label as follows | > > SetWindowText(Me.Label1.Handle.ToInt32, "TEST") | > > it works as expected, i.e. the change is immediately visible | > | > > It looks to me like this may be a window update issue. | > | > Maybe the reason is that .NET draws the button. You may want to test it | > with native Win32 buttons and/or set the .NET button's 'FlatStyle' property | > to 'System'. | > | > -- | > M S Herfried K. Wagner | > M V P <URL:http://dotnet.mvps.org/> | > V B <URL:http://classicvb.org/petition/> | Doh! missed the lower half of the question here.
| I know of course that I can change the text of the button using the I missed the part of the external DLL.| syntax Button1.Text="TEST" however my objective is to use SetWindowText | as I want to change the text later in an external DLL. Is the external DLL written in unmanaged C/C++ or is it a managed (VB, C#) dll? If its a managed Dll; Why not simply pass Button or Control to the external DLL allowing it to use Control.Text? -- Show quoteHide quoteHope this helps Jay B. Harlow [MVP - Outlook] ..NET Application Architect, Enthusiast, & Evangelist T.S. Bradley - http://www.tsbradley.net <supp***@airetec.com> wrote in message news:1157136111.300218.80310@b28g2000cwb.googlegroups.com... | | Hi, | | I am trying to change the text of a Command button using the Windows | API Function SetWindowText, which I have declared as follows: | | <DllImport("User32")> _ | Public Function SetWindowText(ByVal hWnd As IntPtr, ByVal | lpString As String) As Boolean | End Function | | To change the text I call the function as follows in the Load event of | the form. | SetWindowText(Me.Button1.Handle.ToInt32, "TEST") | Nothing appears to happen however when I examine the Button using Spy++ | it tells me the window has the text "TEST". | | When I change the text of a label as follows | SetWindowText(Me.Label1.Handle.ToInt32, "TEST") | it works as expected, i.e. the change is immediately visible | | I know of course that I can change the text of the button using the | syntax Button1.Text="TEST" however my objective is to use SetWindowText | as I want to change the text later in an external DLL. | | It looks to me like this may be a window update issue. I have tried | invalidating the window and repainting it with no success. Can anyone | help me out on this? | | Thanks in advance | | Joe | Hi Jay,
its an unmanaged C++ DLL. The curious thing is if I set the text of the button using SetWindowText to say "XYZ" and then read it back using GetWindowText I get "XYZ" as a result. It just doesn't display the text I set even if I repaint the screen. If however I change the flatstyle of the button to system, then it works. Problem is that is not an option. Regards Joe Jay B. Harlow [MVP - Outlook] schrieb: Show quoteHide quote > Doh! missed the lower half of the question here. > > > | I know of course that I can change the text of the button using the > | syntax Button1.Text="TEST" however my objective is to use SetWindowText > | as I want to change the text later in an external DLL. > I missed the part of the external DLL. > > Is the external DLL written in unmanaged C/C++ or is it a managed (VB, C#) > dll? > > If its a managed Dll; Why not simply pass Button or Control to the external > DLL allowing it to use Control.Text? > > -- > Hope this helps > Jay B. Harlow [MVP - Outlook] > .NET Application Architect, Enthusiast, & Evangelist > T.S. Bradley - http://www.tsbradley.net > > > <supp***@airetec.com> wrote in message > news:1157136111.300218.80310@b28g2000cwb.googlegroups.com... > | > | Hi, > | > | I am trying to change the text of a Command button using the Windows > | API Function SetWindowText, which I have declared as follows: > | > | <DllImport("User32")> _ > | Public Function SetWindowText(ByVal hWnd As IntPtr, ByVal > | lpString As String) As Boolean > | End Function > | > | To change the text I call the function as follows in the Load event of > | the form. > | SetWindowText(Me.Button1.Handle.ToInt32, "TEST") > | Nothing appears to happen however when I examine the Button using Spy++ > | it tells me the window has the text "TEST". > | > | When I change the text of a label as follows > | SetWindowText(Me.Label1.Handle.ToInt32, "TEST") > | it works as expected, i.e. the change is immediately visible > | > | I know of course that I can change the text of the button using the > | syntax Button1.Text="TEST" however my objective is to use SetWindowText > | as I want to change the text later in an external DLL. > | > | It looks to me like this may be a window update issue. I have tried > | invalidating the window and repainting it with no success. Can anyone > | help me out on this? > | > | Thanks in advance > | > | Joe > | 
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