captomem.cpp

一个完整的数字硬盘录像机系统软件

void CMainFrame::OnViewCaptomem() 
{
	// TODO: Add your command handler code here
	GetClientRect(&DisplayRect);
	BITMAPINFO BMIInfo;
	BMIInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
	BMIInfo.bmiHeader.biWidth = DisplayRect.Width();
	BMIInfo.bmiHeader.biHeight = DisplayRect.Height();
	BMIInfo.bmiHeader.biPlanes = 1;
	BMIInfo.bmiHeader.biBitCount = 24;
	BMIInfo.bmiHeader.biCompression = BI_RGB;
	BMIInfo.bmiHeader.biSizeImage = 0;
	BMIInfo.bmiHeader.biXPelsPerMeter = 0;
	BMIInfo.bmiHeader.biYPelsPerMeter = 0;
	BMIInfo.bmiHeader.biClrUsed = 0;
	BMIInfo.bmiHeader.biClrImportant = 0;

	HGLOBAL hDIB;
	DWORD dwSize = (long)DisplayRect.Width() * 
				   (long)DisplayRect.Height()*3L;
	hDIB = GlobalAlloc(GHND, dwSize);
	if( hDIB ){
		char* lpvBits = (char *)GlobalLock(hDIB);
		CDC* pScrnDC = GetDC();
		HANDLE vxdHandle = LoadDevice();
		DWORD dwPage;
		DWORD PhysMemAddr;
		DWORD MemHandle;
		DWORD LineAddr;
		StaticMemAlloc(&dwPage, &PhysMemAddr, &MemHandle, &LineAddr);
		char *lpSourceBuf = (char *)LineAddr;
		int nSum = 23;
		CG200CaptureToMem(hcg200, PhysMemAddr, dwPage*4*1024, 2 ,FRAME, nSum);

		for(int k = 0; ; ++k){	
			CG200ReadFromMem( hcg200, lpSourceBuf, dwPage*4*1024, k, lpvBits);
			
			pScrnDC->SetStretchBltMode(COLORONCOLOR);
			SetDIBitsToDevice( (HDC)*pScrnDC,
								DisplayRect.left, DisplayRect.top,
								DisplayRect.Width(), DisplayRect.Height(),
								DisplayRect.left, DisplayRect.top,
								0, DisplayRect.Height(), lpvBits,
								&BMIInfo, DIB_RGB_COLORS);
			if(k > 21)
		    	k = -1; 

			MSG	lpMsg;
		    PeekMessage(&lpMsg,NULL,0,0,PM_REMOVE);
			if( (GetKeyState(VK_ESCAPE) &0x80) == 0x80 ||
				(GetKeyState(VK_LBUTTON)&0x80) == 0x80 ||
				(GetKeyState(VK_RBUTTON)&0x80) == 0x80 )
				break; 
		}

	//	bRet = PhysMemFree(vxdHandle, MemAlloc.Handle);
		ReleaseDC(pScrnDC);
		GlobalUnlock(hDIB);
		GlobalFree(hDIB);
		CloseDevice(vxdHandle);
	}
}