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Article View: borland.public.cppbuilder.nativeapi
Article #8929

Re: SetClassLong problems

#8929
From: Lynn Morrison
Date: Mon, 06 Sep 2004 01:38
40 lines
2337 bytes
When I run it, I get an access violation and my app shuts down.... can you
look at my code below? I get it on the call to CreateWindowEx... The
register class seems ok...
Thanks, Lynn


bool ClassRegistered;
TWndClassEx C;
ATOM A;
  MCustomSocketWindowClass.cbSize = sizeof(TWndClassEx);
  MCustomSocketWindowClass.style = 0;
  MCustomSocketWindowClass.cbClsExtra = sizeof(long);
  MCustomSocketWindowClass.cbWndExtra = 0;
  MCustomSocketWindowClass.hInstance = HInstance;
  MCustomSocketWindowClass.hIcon = 0;
  MCustomSocketWindowClass.hCursor = 0;
  MCustomSocketWindowClass.hbrBackground;
  MCustomSocketWindowClass.lpszMenuName = NULL;
  MCustomSocketWindowClass.lpszClassName = "MCustomSocketWindowClass";

  // Just use C as a temp to fetch the info
  ClassRegistered =
GetClassInfoEx(HInstance,MCustomSocketWindowClass.lpszClassName,&C);
  if (!ClassRegistered) {
    A = RegisterClassEx(&MCustomSocketWindowClass);
    if(!A) {
      FErrorCode = GetLastError();
      return 0;
    }
  }
  FHandle =
CreateWindowEx(WS_EX_TOOLWINDOW,"MCustomSocketWindowClass","",WS_POPUP,0,0,0
,0,0,0,HInstance,NULL);
  if(FHandle == NULL) {
    return 0;
  }
  FWndProc = MakeObjectInstance(LocalWindProc);
  FOldWndProc = SetWindowLong(FHandle, GWL_WNDPROC, (LONG)FWndProc);
  SetWindowLong(FHandle, GWL_USERDATA, (LONG) this);
  return FHandle;
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From: "Lynn Morrison" <Cranky@__whisp.com>
Newsgroups: borland.public.cppbuilder.nativeapi
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Subject: Re: SetClassLong problems
Date: Sun, 5 Sep 2004 21:38:39 -0400
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