Hello All,
I was wondering how to call API functions within .NET. I'm getting:
An unhandled exception of type
'System.Runtime.InteropServices.MarshalDirectiveEx ception' occurred in
WindowsApplication1.exe
Additional information: PInvoke restriction: can not return variants.
when running this code:
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As Long,
ByVal lpdwProcessID As Long)
************************************************** **********
Dim objExcel As New Excel.ApplicationClass()
Dim lngProcessID As Long
Dim lngHwnd As Long
With objExcel
lngHwnd = .Hwnd
GetWindowThreadProcessID(lngHwnd, lngProcessID) <---- error occurs
.Quit()
End With
I have no clue why this is happening. Any ideas or guidance would be
greatly appreciated.
Thanks,
Frank
10  4044 
Frank, Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As Long,
ByVal lpdwProcessID As Long)
- Turn on Option Strict
- Change the declaration to
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Frank, Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As Long,
ByVal lpdwProcessID As Long)
- Turn on Option Strict
- Change the declaration to
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Frank DeLuccia wrote: Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
Long, ByVal lpdwProcessID As Long)
You missed an "as System.UInt32"
And the correct definition is (for C#):
[DllImport("user32.dll")]
static extern uint GetWindowThreadProcessId(IntPtr hWnd,
out IntPtr lpdwProcessId);
For more info see www.pinvoke.net
--
Greetings
Jochen
Do you need a memory-leak finder ? http://www.codeproject.com/tools/leakfinder.asp
Do you need daily reports from your server? http://sourceforge.net/projects/srvreport/
Frank DeLuccia wrote: Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
Long, ByVal lpdwProcessID As Long)
You missed an "as System.UInt32"
And the correct definition is (for C#):
[DllImport("user32.dll")]
static extern uint GetWindowThreadProcessId(IntPtr hWnd,
out IntPtr lpdwProcessId);
For more info see www.pinvoke.net
--
Greetings
Jochen
Do you need a memory-leak finder ? http://www.codeproject.com/tools/leakfinder.asp
Do you need daily reports from your server? http://sourceforge.net/projects/srvreport/
Thanks for the response! I changed the declaration as instructed and now
I'm getting this:
An unhandled exception of type 'System.EntryPointNotFoundException' occurred
in WindowsApplication1.exe
Additional information: Unable to find an entry point named
GetWindowThreadProcessID in DLL user32.
Here is the change:
Option Strict On
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
************************************************** *******
Dim objExcel As New Excel.ApplicationClass()
Dim objPtr As IntPtr
Dim intID As Integer
With objExcel
objPtr = New IntPtr(objExcel.Hwnd)
GetWindowThreadProcessID(objPtr, intID) <---- Fails
End With
Thanks again for your time,
Frank
"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:Op**************@tk2msftngp13.phx.gbl... Frank,
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
Long,ByVal lpdwProcessID As Long)
- Turn on Option Strict
- Change the declaration to
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Thanks for the response! I changed the declaration as instructed and now
I'm getting this:
An unhandled exception of type 'System.EntryPointNotFoundException' occurred
in WindowsApplication1.exe
Additional information: Unable to find an entry point named
GetWindowThreadProcessID in DLL user32.
Here is the change:
Option Strict On
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
************************************************** *******
Dim objExcel As New Excel.ApplicationClass()
Dim objPtr As IntPtr
Dim intID As Integer
With objExcel
objPtr = New IntPtr(objExcel.Hwnd)
GetWindowThreadProcessID(objPtr, intID) <---- Fails
End With
Thanks again for your time,
Frank
"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:Op**************@tk2msftngp13.phx.gbl... Frank,
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
Long,ByVal lpdwProcessID As Long)
- Turn on Option Strict
- Change the declaration to
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Frank, Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
The function name should en with Id, not ID. Yes, Win32 entry points
are case sensitive. Sorry I missed that before.
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Frank, Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
The function name should en with Id, not ID. Yes, Win32 entry points
are case sensitive. Sorry I missed that before.
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
No need to apologize. I should have seen it.
It worked!!! Thanks for your help!!
It's greatly appreciated!!!
-Frank
"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:u5**************@TK2MSFTNGP12.phx.gbl... Frank,
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
The function name should en with Id, not ID. Yes, Win32 entry points
are case sensitive. Sorry I missed that before.
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
No need to apologize. I should have seen it.
It worked!!! Thanks for your help!!
It's greatly appreciated!!!
-Frank
"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:u5**************@TK2MSFTNGP12.phx.gbl... Frank,
Declare Function GetWindowThreadProcessID Lib "user32" (ByVal hwnd As
IntPtr, ByRef lpdwProcessID As Integer) As Integer
The function name should en with Id, not ID. Yes, Win32 entry points
are case sensitive. Sorry I missed that before.
Mattias
--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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