> I am doing something wrong, but I cannot tell what. Either the web
> browser is failing to upload the file, or the script is failing to catch
> it. Either way, PostedFile is ending up empty.
>
> First of all, I must specify a few things.
>
> EVERYTHING IS SET UP IN THE CODE-BEHIND. THAT INCLUDES WRITING OUT ALL
> OF THE HTML, AND ALL OF THE PAGE ELEMENTS. THERE IS NOTHING WHATSOEVER
> IS THE WEB PAGE ITSELF, ASIDE FROM THE LINK TO THE CODE-BEHIND .VB FILE.
>
> ALSO, CODE IS ONLY SNIPPETS; IT IS NOT THE COMPLETE SCRIPT. THE COMPLETE
> SCRIPT RUNS AT OVER 3600 LINES, I DOUBT YOU WANT TO SEE THAT HERE. SO
> DON'T BITCH THAT MY CODE IS NOT "COMPLETE", AS IT ACTUALLY IS, I'M JUST
> LEAVING OUT REDUNDANT CODE.
>
> Sorry for the shouting text, but some people just won't read the
> details, and get bent out of shape when I have to repeat myself.
>
> I have set up the form as follows:
>
>     myForm.ID = "myForm"
>     myForm.EncType = "multipart/form-data"
>     Controls.Add(myForm)
>     inputfile.id = "ImageUpload"
>     inputfile.Accept = "image/jpg"
>     myForm.Controls.Add(inputfile)
>
> when I submit a fully-filled out form, other form elements (such as
> textareas and input fields) can be easily recovered using
> "inputfield.value", but using "inputfile.PostedFile" doesn't get me
> anything back. That is, it is completely empty. When I try to get its
> contents written out
>
> ltrlPreview.Text = inputfile.PostedFile.ContentLength
>
> I get "0"
>
> When I use
>
> ltrlPreview.Text = inputfile.PostedFile.ToString()
>
> I get "System.Web.HttpPostedFile"
>
> When I try "ImageUpload.PostedFile.ToString()" instead, the script
> claims that ImageUpload has not been defined (even though it's clearly
> used as the ID for the inputfile element). When I add:
>
> Protected WithEvents ImageUpload As
> System.Web.UI.HtmlControls.HtmlInputFile
>
> to appease the script (which doesn't make sense, since I don't have any
> raw HTML, everything is created in the code-behind, so this shouldn't
> have to be implemented) I get:
>
>
>  Object reference not set to an instance of an object.
> Exception Details: System.NullReferenceException: Object reference not
> set to an instance of an object.
> Stack Trace:
>
> [NullReferenceException: Object reference not set to an instance of an
> object.]
>    TeamMetz.Add30_Preview(Object sender, EventArgs e) +395
>    System.Web.UI.HtmlControls.HtmlInputButton.OnServerClick(EventArgs e)
> +108
>
> System.Web.UI.HtmlControls.HtmlInputButton.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
>
>
> (In fact, when trying about a dozen other methods to retrieve the
> contents of the uploaded file, the same error occurs. WHY??? What the
> *f*cking hell* does this error really mean?? Everything on the 'Net
> about this error seems to make use of doublespeak, smoke & mirrors and
> 20-syllable tech words that are probably only found in PhD dissertions)
>
> The really strange thing is that every other form field element can be
> easily retrieved by calling its .value content. That is, if I add a text
> field using:
>
>     inputtext.id = "Name"
>     inputtext.MaxLength = 50
>     myForm.Controls.Add(inputtext)
>
> all I have to use to access the value I put in the field is:
>
> inputtext.value
>
> I don't even have to do a Request.Form("Name") to access it (unless I
> have used more than one inputtext in a form). However, the inputfile
> field seems to have resisted all attempts to retrieve data from it. I
> select a proper file, attempt to upload it, and *poof*; nothing happens.
> Nothing *appears* to have been uploaded, because inputfile.PostedFile is
> empty.
>
> Any help whatsoever would be greatly appreciated.
>
> TIA,
> ...Geshel

> Please post your full code.
>
>
>
>
> Only joking.
>
> The error message "Object reference not set to an instance of an object"
> usually means you've declared a variable but have not created an
> instance of it, for example.
>
> Assuming I have a placeholder on a page called plhTest:
>
> Dim objTextbox As TextBox
> objTextbox.Text = "Hello World"
> plhTest.Controls.Add(objTextbox)
>
> This would give the object reference error message. I've declared a
> variable of type textbox but I haven't created an instance using New:
>
> Dim objTextbox As New TextBox
> objTextbox.Text = "Hello World"
> plhTest.Controls.Add(objTextbox)
>
> Or if you prefer:
>
> Dim objTextbox As TextBox
> objTextbox = New TextBox
> objTextbox.Text = "Hello World"
> plhTest.Controls.Add(objTextbox)
>
> With regard to the upload, is a file created on the server at all? If
> not check the permissions on the folder you are trying to write to.
>
>
> Here's some simple test code if you want to try this
>
> Protected Sub btnUpload_Click(ByVal sender As Object, ByVal e As _
> System.EventArgs) Handles btnUpload.Click
> Dim strUploadPath As String = Server.MapPath("~/imguploads/")
> Dim fileOK As Boolean = False
> Dim strFileExt As String
> Dim strAllowedExt As String() = {".jpg", ".jpeg", ".png", ".gif"}
>
> If fupImage.HasFile Then
>  strFileExt = System.IO.Path.GetExtension(fupImage.FileName).ToLower()
>
>  For i As Integer = 0 To strAllowedExt.Length - 1
>   If strFileExt = strAllowedExt(i) Then
>    Try
>       fupImage.PostedFile.SaveAs(strUploadPath & _
>        fupImage.FileName)
>    Catch ex As Exception
>      lblError.Text = ex.Message.ToString
>    End Try
>
>   End If
>   Next
>  End If
> End Sub
>
> Just add an upload control (fupImage) a label (lblError) and a button
> (btnUpload) to a page and create a folder called imguploads in the root
> of the website.

> Neo Geshel wrote:
>  >
>> The file is being placed into a database. Also, when I attempt to
>> parse the file (either by ID value,
>> ImageUpload.PostedFile.ContentLength or by control name,
>> uploadfile.PostedFile.ContentLength) it always comes out to zero,
>> regardless of file. It's as if the browser never uploaded the file to
>> begin with.
>>
>> VERY FRUSTRATING!!
>>
>> TIA
>> ...Geshel
>
> it certainly sounds like it could be something wrong with the browser.
> Does it have a virus checker/personal firewall that could be blocking
> the upload?
>
> Out of interest, try that code I gave you earlier to see if the browser
> is uploading files at all.
>
> Tony

> I think I managed to find out what is going wrong.
>
> It appears that Firefox is the problem. I can't check it on IE, because
> the method of previewing the images prior to submission into the
> database is too advanced for IE to use (that is, I use <img
> src="data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAY.... to preview the
> form contents prior to a formal database submission, which IE is to
> primitive and out-of-date to handle). However, everything works fine
> with Opera. I can upload images, no problem.
>
> Any ideas if 1.5.0.2 is the culprit??
>
> TIA.
> ...Geshel

> I think I managed to find out what is going wrong.
>
> It appears that Firefox is the problem. I can't check it on IE, because
> the method of previewing the images prior to submission into the
> database is too advanced for IE to use (that is, I use <img
> src="data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAY.... to preview the
> form contents prior to a formal database submission, which IE is to
> primitive and out-of-date to handle). However, everything works fine
> with Opera. I can upload images, no problem.
>
> Any ideas if 1.5.0.2 is the culprit??
>
> TIA.
> ...Geshel