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Shell Execute VB Error Message - Unbalanced Stack

Posted on 2007-03-22
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Last Modified: 2013-11-27
Hi Experts

I am trying to open a doc file using a VB application.
The code I am using is as below:

Public Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hWnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long

ShellExecute(0&, "Open", "MyFileName.doc", CommandLine, vbNullString, 1)

i end up in getting the error message "A call to PInvoke function 'SampleWorkFlowAppln!SampleWorkFlowAppln.Form1::ShellExecute' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature."

Any suggestions on what could be wrong?
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Question by:arsmed840
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Mike Tomlinson earned 200 total points
ID: 18793899
You must be using VB.Net.

The problem is your API Declare is using VB6 data types.

In general, when converting API declares from VB6 to VB.Net, just change "Long" to "Integer":

    Public Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hWnd As Integer, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Integer) As Integer

But this doesn't matter since ShellExecute() isn't really needed for your case...

Just use:

    Process.Start("MyFileName.doc")

and the document should open.  =)
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