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A call to PInvoke function unbalanced the stack.

Posted on 2006-07-11
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Last Modified: 2008-02-20
I got this error when running the following code:
A call to PInvoke function 'tonin_image!tonin_image.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.


Public Class Form1

    Private 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

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles a.Click
        Dim HttpJump
        Dim MyUrl As String

        MyUrl = "http://server/default.aspx?lease=" + a.Text + "&file_sufx=" + File_Sufx.Text
        ShellExecute(0, "", MyUrl, "", "", vbNormalFocus)

    End Sub
End Class
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Question by:ewang1205
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Expert Comment

by:Mike Tomlinson
ID: 17086015
You've got a VB6 declaration there...

Convert all "Long" to "Integer" and you should be good to go:

    Private 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
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Mike Tomlinson earned 500 total points
ID: 17086049
On a side note, you don't really need ShellExecute in VB.Net...

Try this instead:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles a.Click
        Process.Start("http://server/default.aspx?lease=" & a.Text & "&file_sufx=" & File_Sufx.Text)
    End Sub

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