小弟想從webcam的動態影像抓出影像 用getpixel取得RGB數值,再顯示所抓到影像 我的程式不能顯示抓到影像 請各位指出我的程式問題所在,給我一些提議 [code]  void BitmapDemo (HWND hwnd) {     HDC hdc2,hdcR,hdc;     PAINTSTRUCT ps;         int x,TRed;         HBITMAP hBitmapTransparent;          COLORREF n[240][320];         hdc2 = GetDC(hWndC); /* get device context */                 hdc = BeginPaint(hWndC, &ps);                 hdcR = CreateCompatibleDC(hdc);                                  for (y=0; y<241 ;y ) for (x=0; x<321 ; x ) n[y][x] = GetPixel(hdc, x, y); BitBlt(hdc, 0, 0, 320, 240, hdcR, 320,0, SRCCOPY); hBitmapTransparent = CreateBitmap(320,240,1,24,&n); SelectObject(hdcR, hBitmapTransparent); BITMAP bitmapTransparent; GetObject(hBitmapTransparent,sizeof(bitmapTransparent), &bitmapTransparent); for ( TRed =0; TRed <256 ; TRed ) TransparentBlt(hdc, 320, 0, 320, 240, hdcR, 320, 0, 320, 240, RGB(TRed, 0, 0)); BitBlt(hdc, 0, 0, 320, 240, hdcR, 320,0, SRCCOPY); DeleteObject(hBitmapTransparent); ReleaseDC(hWndC, hdc); EndPaint(hWndC, &ps); }