mfc中的透明窗体的设置

Using Layered Windows

To have a dialog box come up as a translucent window, first create the dialog as usual. Then, on WM_INITDIALOG, set the layered bit of the window's extended style and callSetLayeredWindowAttributes with the desired alpha value. The code might look like this:

 

// Set WS_EX_LAYERED on this window

SetWindowLong(hwnd,

              GWL_EXSTYLE,

              GetWindowLong(hwnd, GWL_EXSTYLE) | WS_EX_LAYERED);

 

// Make this window 70% alpha

SetLayeredWindowAttributes(hwnd, 0, (255 * 70) / 100, LWA_ALPHA);

SetLayeredWindowAttributes函数是全局api函数，需要在前面加::

上面来自于MSDN。