sendmessage not sending in VB dll:

[ns]

The VB dll has in a function:

result = SendMessage(PbarHandle, 1026, 5, 0)

The VC client sends in the handle of a progressbar. I verfied that handle sent in is being received by the VB dll. However if I put a msgBox right after the SendMessage, it doesnt fire. In the VC client, at the call to the dll, a com error happens:

void CMswayView::OnButton2() 
{

     try
      {
      CoInitialize(NULL);
	  _Class1Ptr ptr;
	  ptr.CreateInstance(__uuidof(Class1));
	  m_Progress1.SetStep(1);

	  m_Progress1.SetRange(1, 10);


		
		long lHwnd=(long)m_Progress1.GetSafeHwnd();
		
		ptr->CheckingStuff(&lHwnd);  //com error happens here

      }
      catch(_com_error &e)
      {
       bstrDesc = e.Description();

      }
      CoUninitialize();
}

But we know the error is happening in the VB dll since the we cant get past the sendmessage, and the very next line: msgbox doesnt fire. How can I figure out what is happening? Why is sendmessage not working? Is it that I've done something dumb in sending in the handle and its not valid anymore or something? I have a #import in my VC client for the VB dll. Thanks, ns 1026 is just setting the position. Not even 1029 (PBM_STEPIT) works. Somethigs fundamentally flawed in my assumptions here...

[Matt Philmon]

Show me how you declared SendMessage (hint: in VB6 you used Long for Window Handle. In VB.NET you need to use Integer)

[nss]

Private Declare Function SendMessage Lib "User" (ByVal hWnd As Long, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Long) As Long

I changed it to ByVal hWnd As Long, it was originally integer from the msDN. But it still doesnt work.....:confused::confused: The msgbox doesnt fire,

               result = SendMessage(pBAr, 1029, 0, 0)
               
               MsgBox result   /// never fires

The VC client gets a com error at runtime (goes into the catch(com e) block) is:

sway.exe (KERNEL32.DLL): 0xC000008F: Float Inexact Result.

Desperate!