使窗口透明

 

long lExstyle = GetWindowLong(m_hWnd, GWL_EXSTYLE);
 lExstyle = lExstyle|WS_EX_LAYERED;
 SetWindowLong(m_hWnd, GWL_EXSTYLE, lExstyle);

 BYTE m_bytAlpha = 50;    //透明度

 SetLayeredWindowAttributes(NULL, m_bytAlpha, LWA_ALPHA);