如何检查其他程序是否以全屏模式运行，例如.媒体播放器

using a combination of EnumWindows, GetWindowInfo and GetWindowRect does the trick.

bool IsTopMost( HWND hwnd )
{
  WINDOWINFO info;
  GetWindowInfo( hwnd, &info );
  return ( info.dwExStyle & WS_EX_TOPMOST ) ? true : false;
}

bool IsFullScreenSize( HWND hwnd, const int cx, const int cy )
{
  RECT r;
  ::GetWindowRect( hwnd, &r );
  return r.right - r.left == cx && r.bottom - r.top == cy;
}

bool IsFullscreenAndMaximized( HWND hwnd )
{
  if( IsTopMost( hwnd ) )
  {
    const int cx = GetSystemMetrics( SM_CXSCREEN );
    const int cy = GetSystemMetrics( SM_CYSCREEN );
    if( IsFullScreenSize( hwnd, cx, cy ) )
      return true;
  }
  return false;
}

BOOL CALLBACK CheckMaximized( HWND hwnd, LPARAM lParam )
{
  if( IsFullscreenAndMaximized( hwnd ) )
  {
    * (bool*) lParam = true;
    return FALSE; //there can be only one so quit here
  }
  return TRUE;
}

bool bThereIsAFullscreenWin = false;
EnumWindows( (WNDENUMPROC) CheckMaximized, (LPARAM) &bThereIsAFullscreenWin );

edit2:使用经过测试的代码进行了更新，在 Windows 7 上的 MediaPlayer 中运行良好.我尝试使用 GetForeGroundWindow 而不是 EnumWindows，但随后 IsFullScreenSize() 检查仅根据鼠标所在的媒体播放器区域起作用.