Hi all,

 I'm not quite sure what's going on, but, here goes: I have a project
in VB.NET 2005 going.  I make a call to an unmanaged function.  I'm
using the declaration below:

Private Declare Function GetWindowModuleFileName Lib "user32.dll"
Alias "GetWindowModuleFileNameA" (ByVal hwnd As Integer, ByRef
pszFileName As String, ByVal cchFileNameMax As Integer) As Integer

 Now, elsewhere, I have a call that looks like this:

Dim Str As String
Dim StrLen As Integer
StrLen = 300
Str = Space(StrLen)
StrLen = GetWindowModuleFileName(iHwnd, Str, StrLen)

 ...where iHwnd is passed in as a parameter.  I do know that in each
case iHwnd is a valid handle.

 Here's the weird part: I get a PInvokeStackImbalance Exception
complaining about a probable mismatch in the function's signature.
The thing is, this code is only called when I hit a certain key.  Now,
if, say, Notepad or the DevEnv has the focus and I hit the key, all is
well and my code works fine.  However, when a couple of apps have the
focus (e.g. Windows Explorer) and I hit the key, I get that
PInvokeStackImbalance.

 Can anyone help?  If more info is needed, just let me know.

 Thanks in advance!