拉伸图像和窗口

以下示例拉伸视频剪辑的图像并更改所显示帧的纵横比。 MCIWnd 窗口中显示的帧高度是原始框架的两倍，宽度是原始框架的三倍。 MCIWndGetDest 和 MCIWndPutDest 宏检索并重新定义目标矩形坐标。 GetWindowRect 和 SetWindowPos 函数管理对 MCIWnd 窗口维度的更改。

// extern RECT rCurrent, rDest; 
 
case WM_COMMAND: 
   switch (wParam) 
   { 
       case IDM_CREATEMCIWND: 
           g_hwndMCIWnd = MCIWndCreate(hwnd, 
           g_hinst, 
           WS_CHILD | WS_VISIBLE, 
          "sample.avi"); 
           break;    
 
       case IDM_RESIZEWINDOW: // destination RECT and playback area
           GetWindowRect(g_hwndMCIWnd, &rWin);     // window size 
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT
           rDest.top = rCurrent.top;               // new boundaries 
           rDest.right = rCurrent.right; 
           rDest.left = rCurrent.left + 
               ((rCurrent.left - rCurrent.right) * 3); 
           rDest.bottom = rCurrent.top + 
               ((rCurrent.bottom - rCurrent.top) * 2); 
           MCIWndPutDest(g_hwndMCIWnd, &rDest); // new RECT
           SetWindowPos(g_hwndMCIWnd,           // window to resize 
               NULL,                          // z-order: don't care 
               0, 0,                          // position: don't care
               rDest.right - rDest.left,      // width 
               (rWin.bottom - rWin.top +           // height (window - 
               (rCurrent.bottom - rCurrent.top) +  //  original RECT +
               (rDest.bottom - rDest.top)),        //  new RECT
               SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE); 
           break; 
   } 
   break; 
 
   // Handle other messages here.