Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!helios!tamuts!n077dr
From: n077dr@tamuts.tamu.edu (Xuejun Yang)
Newsgroups: comp.windows.ms
Subject: Re: SDK and Turbo C++
Keywords: Win3, SDK
Message-ID: <8223@helios.TAMU.EDU>
Date: 13 Sep 90 19:09:50 GMT
References: <15962@thorin.cs.unc.edu> <3279@PEDEV.Columbia.NCR.COM>
Sender: usenet@helios.TAMU.EDU
Organization: Texas A&M University
Lines: 60

Dear netters:
I am trying to build a Windows interface to the PC VisionPlus frame grabber so
that the images captured by the frame grabber can be transferred into Windows
for display. I have successfully captured images by issuing window commands.
The problem is as soon as I try to copy the digitized image from the frame
grabber into Windows, I get a "Unrecoverable Application Error, Program
Terminated!". The Window version is 3.0 and the frame grabber library is
image tool by Werner Frei Associates. Everything works fine separately.
My suspicion is that there is a resource conflict(mouse,curser,memory).
Below is the code segment:
 -----------------------Cut Here-------------------------

#include "d:\windev\include\windows.h"
#include "imtool.h"

void SnapInitial(hWnd)
HWND	hWnd;
{
    int     i,j,mode,x,y,dx,dy,value;
    HDC     hDC;
    HDC     hMemoryDC;
    HBITMAP hBitmap;
    HBITMAP hOldBitmap;

    init();
    mode = 1;
    DIGITZ(&mode); /* snaps an image */
    x = 0;
    y = 0;
    dx = 64;
    dy = 64;

    hDC = GetDC(hWnd);
    hMemoryDC = CreateCompatibleDC(hDC);
    hBitmap = CreateCompatibleBitmap(hDC,dx,dy);
    hOldBitmap = SelectObject(hMemoryDC,hBitmap);
    PatBlt(hMemoryDC,x,y,dx,dy,WHITENESS);

      for(i=x;i<dx;i++)
	for(j=x;j<dy;j++)
	{
	  RDPXL(&i,&j,&value); /*Read a pixel*/ /* HERE IS THE PROBLEM*/
	  SetPixel(hMemoryDC,i,j,RGB(value,value,value));
	}
    BitBlt(hDC,x,y,dx,dy,hMemoryDC,0,0,SRCCOPY);
    SelectObject(hMemoryDC,hOldBitmap);
    DeleteDC(hMemoryDC);
    ReleaseDC(hWnd,hDC);
}
 ---------------------Cut Here----------------------
 Am I missing something or doing something wrong? How can I fix it?
 Is there any other way? Please E-mail to me directly. I will summarize
 the response and post it. Any help will be greatly appreciated?

  Sherman

  Email: x0y3510@venus.tamu.edu

  phone: (409) 845 7942
  Fax:	 (409) 847 8553