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Object variable or With block variable not setfollowing error: Server Error in '/' Application. Object variable or With block variable not set. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object variable or With block variable not set. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [NullReferenceException: Object variable or With block variable not set.] Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet(Object o, Type objType, String name, Object[] args, String[] paramnames, Boolean[] CopyBack) +934 TeamMetz.Add30_Preview(Object sender, EventArgs e) +73 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain() +1292 Version Information: Microsoft .NET Framework Version:1.1.4322.2300; ASP.NET Version:1.1.4322.2300 What is happening is that I try to catch the image using the following: Private Sub Add30_Preview(ByVal sender As Object, ByVal e As EventArgs) Dim imgContent as Object = request.form("ImageUpLoad") Dim imgStream as Stream imgStream = imgContent.PostedFile.InputStream It is clear that the error occurs at the last two lines, because if I comment them out, everything goes fine (except that the images cannot be "handled", and therefore do not come up in the preview). TIA. ...Geshel -- *********************************************************************** * My reply-to is an automatically monitored spam honeypot. Do not use * * it unless you want to be blacklisted by SpamCop. Please reply to my * * first name at my last name dot org. * *********************************************************************** * “I contend that we are both atheists. I just believe in one fewer * * god than you do. When you understand why you dismiss all the other * * possible gods, you will understand why I dismiss yours.†* * - Stephen F. Roberts * *********************************************************************** * “Anyone who believes in Intelligent Design (“creationismâ€) is just * * as ignorant, irrational and ill-educated as someone who believes * * that the world is a flat disc, that the Sun circles the Earth or * * that there really is a tooth fairy. Darwinism has an overwhelming * * foundation of evidence that can be tested and reproduced. * * * * “Intelligent Design, on the other hand, has no evidence at all; not * * one single shred of testable proof. As such, Intelligent Design is * * Religious Mythology, and has no right whatsoever to be in our * * Science classrooms.†- 99.99+% of Scientists * *********************************************************************** Mignon McLaughlin once said that “A nymphomaniac is a woman [who is] as obsessed with sex as the average man.†Unfortunately, since true nymphomaniacs are so rare, this means that it takes an extraordinary woman to keep up with an ordinary man. *********************************************************************** Neo,
This is a class where is written "must inherit" so it cannot used as this, beside that you have to instance a class as new. Would you not have to overlook your code what was the base for this. Cor "Neo Geshel" <got***@geshel.org> schreef in bericht I am trying to deal with an image in code-behind. I consistently get thenews:eiIwVRTTGHA.424@TK2MSFTNGP12.phx.gbl... following error: Server Error in '/' Application. Object variable or With block variable not set. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object variable or With block variable not set. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [NullReferenceException: Object variable or With block variable not set.] Microsoft.VisualBasic.CompilerServices.LateBinding.LateGet(Object o, Type objType, String name, Object[] args, String[] paramnames, Boolean[] CopyBack) +934 TeamMetz.Add30_Preview(Object sender, EventArgs e) +73 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain() +1292 Version Information: Microsoft .NET Framework Version:1.1.4322.2300; ASP.NET Version:1.1.4322.2300 What is happening is that I try to catch the image using the following: Private Sub Add30_Preview(ByVal sender As Object, ByVal e As EventArgs) Dim imgContent as Object = request.form("ImageUpLoad") Dim imgStream as Stream imgStream = imgContent.PostedFile.InputStream It is clear that the error occurs at the last two lines, because if I comment them out, everything goes fine (except that the images cannot be "handled", and therefore do not come up in the preview). TIA. ....Geshel -- *********************************************************************** * My reply-to is an automatically monitored spam honeypot. Do not use * * it unless you want to be blacklisted by SpamCop. Please reply to my * * first name at my last name dot org. * *********************************************************************** * "I contend that we are both atheists. I just believe in one fewer * * god than you do. When you understand why you dismiss all the other * * possible gods, you will understand why I dismiss yours." * * - Stephen F. Roberts * *********************************************************************** * "Anyone who believes in Intelligent Design ("creationism") is just * * as ignorant, irrational and ill-educated as someone who believes * * that the world is a flat disc, that the Sun circles the Earth or * * that there really is a tooth fairy. Darwinism has an overwhelming * * foundation of evidence that can be tested and reproduced. * * * * "Intelligent Design, on the other hand, has no evidence at all; not * * one single shred of testable proof. As such, Intelligent Design is * * Religious Mythology, and has no right whatsoever to be in our * * Science classrooms." - 99.99+% of Scientists * *********************************************************************** Mignon McLaughlin once said that "A nymphomaniac is a woman [who is] as obsessed with sex as the average man." Unfortunately, since true nymphomaniacs are so rare, this means that it takes an extraordinary woman to keep up with an ordinary man. *********************************************************************** Hi,
>> Private Sub Add30_Preview(ByVal sender As Object, ByVal e As EventArgs) 1. >> Dim imgContent as Object = request.form("ImageUpLoad")2. >> Dim imgStream as Stream 3. >> imgStream = imgContent.PostedFile.InputStream >> It is clear that the error occurs at the last two lines, because if I IMHO, It is the first line and not the last 2 lines that have the>> comment them out, everything goes fine (except that the images cannot be >> "handled", and therefore do not come up in the preview) problem. The HttpPostedFile.InputStream method *does* return a System.IO.Stream object. So, the problem in my view is how you are constructing your HttpPostedFile object. Assuming that "request" is an HttpRequest object, then it's Form property would return a NameValueCollection of all the Form items. That is where you need to pay attention. Cor wrote : >> This is a class where is written "must inherit" so it cannot used as this, Err... Cor, now I'm a little confused. I understand that a class that>> beside that you have to instance a class as new. is "MustInherit" cannot be instantiated directly, (using the New keyword), but I think that it can still hold an object of that type. For instance, is this code wrong ? :- --------------------------------------------------- Dim MyFile As HttpPostedFile Dim MyStream As System.IO.Stream MyFileCollection = Request.Files MyFile = MyFileCollection(0) ' Initialize the stream. MyStream = MyFile.InputStream --------------------------------------------------- Regards, Cerebrus. Cerebrus wrote:
Show quoteHide quote > Hi, When I try out your code snippet there, I get the following error:> >>> Private Sub Add30_Preview(ByVal sender As Object, ByVal e As EventArgs) > 1. >> Dim imgContent as Object = request.form("ImageUpLoad") > 2. >> Dim imgStream as Stream > 3. >> imgStream = imgContent.PostedFile.InputStream > >>> It is clear that the error occurs at the last two lines, because if I >>> comment them out, everything goes fine (except that the images cannot be >>> "handled", and therefore do not come up in the preview) > > IMHO, It is the first line and not the last 2 lines that have the > problem. > The HttpPostedFile.InputStream method *does* return a System.IO.Stream > object. > > So, the problem in my view is how you are constructing your > HttpPostedFile object. Assuming that "request" is an HttpRequest > object, then it's Form property would return a NameValueCollection of > all the Form items. That is where you need to pay attention. > > Cor wrote : > >>> This is a class where is written "must inherit" so it cannot used as this, >>> beside that you have to instance a class as new. > > Err... Cor, now I'm a little confused. I understand that a class that > is "MustInherit" cannot be instantiated directly, (using the New > keyword), but I think that it can still hold an object of that type. > > For instance, is this code wrong ? :- > --------------------------------------------------- > Dim MyFile As HttpPostedFile > Dim MyStream As System.IO.Stream > > MyFileCollection = Request.Files > MyFile = MyFileCollection(0) > > ' Initialize the stream. > MyStream = MyFile.InputStream > --------------------------------------------------- > > Regards, > > Cerebrus. > Compiler Error Message: BC30002: Type 'HttpPostedFile' is not defined. Source Error: Line 203: End Sub Line 204: Private Sub Add30_Preview(ByVal sender As Object, ByVal e As EventArgs) Line 205:Dim MyFile As HttpPostedFile Line 206:Dim imgStream As System.IO.Stream Line 207: So it appears that no, the code is not correct. TIA. ...Geshel -- *********************************************************************** * My reply-to is an automatically monitored spam honeypot. Do not use * * it unless you want to be blacklisted by SpamCop. Please reply to my * * first name at my last name dot org. * *********************************************************************** * “I contend that we are both atheists. I just believe in one fewer * * god than you do. When you understand why you dismiss all the other * * possible gods, you will understand why I dismiss yours.†* * - Stephen F. Roberts * *********************************************************************** * “Anyone who believes in Intelligent Design (“creationismâ€) is just * * as ignorant, irrational and ill-educated as someone who believes * * that the world is a flat disc, that the Sun circles the Earth or * * that there really is a tooth fairy. Darwinism has an overwhelming * * foundation of evidence that can be tested and reproduced. * * * * “Intelligent Design, on the other hand, has no evidence at all; not * * one single shred of testable proof. As such, Intelligent Design is * * Religious Mythology, and has no right whatsoever to be in our * * Science classrooms.†- 99.99+% of Scientists * *********************************************************************** Mignon McLaughlin once said that “A nymphomaniac is a woman [who is] as obsessed with sex as the average man.†Unfortunately, since true nymphomaniacs are so rare, this means that it takes an extraordinary woman to keep up with an ordinary man. *********************************************************************** Cerebrus wrote:
Show quoteHide quote > For instance, is this code wrong ? :- As well, when I do the following:> --------------------------------------------------- > Dim MyFile As HttpPostedFile > Dim MyStream As System.IO.Stream > > MyFileCollection = Request.Files > MyFile = MyFileCollection(0) > > ' Initialize the stream. > MyStream = MyFile.InputStream > --------------------------------------------------- > > Regards, > > Cerebrus. > Private Sub Add30_Preview(ByVal sender As Object, ByVal e As EventArgs) If Nothing <> ImageUpLoad.PostedFile Then Dim imgStream As Stream = ImageUpLoad.PostedFile.InputStream Dim imgLen As Integer = ImageUpLoad.PostedFile.ContentLength Dim imgType as String = ImageUpLoad.PostedFile.ContentType.ToString().ToLower() End If I get the following error message: Compiler Error Message: BC30451: Name 'ImageUpLoad' is not declared. Source Error: Line 203: End Sub Line 204: Private Sub Add30_Preview(ByVal sender As Object, ByVal e As EventArgs) Line 205: If Nothing <> ImageUpLoad.PostedFile Then Line 206: Dim imgStream As Stream = ImageUpLoad.PostedFile.InputStream Line 207: Dim imgLen As Integer = ImageUpLoad.PostedFile.ContentLength The problem is, ImageUpLoad is properly declared in the code!! It is properly declared as an HtmlInputFile in the Page_Load in the following manner: Dim imgupload As New HtmlInputFile myForm.Controls.Add(imgupload) imgupload.ID = "ImageUpLoad" imgupload.Accept = "image/jpg" Please Help! TIA. ...Geshel -- *********************************************************************** * My reply-to is an automatically monitored spam honeypot. Do not use * * it unless you want to be blacklisted by SpamCop. Please reply to my * * first name at my last name dot org. * *********************************************************************** * “I contend that we are both atheists. I just believe in one fewer * * god than you do. When you understand why you dismiss all the other * * possible gods, you will understand why I dismiss yours.†* * - Stephen F. Roberts * *********************************************************************** * “Anyone who believes in Intelligent Design (“creationismâ€) is just * * as ignorant, irrational and ill-educated as someone who believes * * that the world is a flat disc, that the Sun circles the Earth or * * that there really is a tooth fairy. Darwinism has an overwhelming * * foundation of evidence that can be tested and reproduced. * * * * “Intelligent Design, on the other hand, has no evidence at all; not * * one single shred of testable proof. As such, Intelligent Design is * * Religious Mythology, and has no right whatsoever to be in our * * Science classrooms.†- 99.99+% of Scientists * *********************************************************************** Mignon McLaughlin once said that “A nymphomaniac is a woman [who is] as obsessed with sex as the average man.†Unfortunately, since true nymphomaniacs are so rare, this means that it takes an extraordinary woman to keep up with an ordinary man. *********************************************************************** Neo wrote :
>> So it appears that no, the code is not correct. Actually not, Neo, since the code was copied from an MSDN page, so it>> TIA. >> ...Geshel *is* correct. HttpPostedFile is not recognized probably since you need to import the System.Web namespace. When I asked Cor Ligthert if the code was *wrong*, I didn't mean syntactically wrong, I just meant Logically wrong. >> It is properly declared as an HtmlInputFile in the Page_Load... There you have a problem ! Declare it outside of any method, so it willbe a global variable. Then you can instantiate it within the Load method. Since you have declared it within the Page_Load method, it goes out of context the moment the Page_Load method completes. Therefore, when you reference it within another method, the compiler will ring the alarm bells, saying the variable is not declared ! Outside any method : ------------------------------- Dim imgupload As New HtmlInputFile Within Page_Load method : ---------------------------------------- imgUpload = New HtmlInputFile () Now go ahead and use it in your Add30_Preview method. HTH, Regards, Cerebrus. 
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