WinForm特效之桌面上的遮罩层实现方法

本文实例讲述了winform特效之桌面上的遮罩层实现方法，分享给大家供大家参考之用。具体如下：

这个一个窗体特效，可以帮你了解几个windows api函数。

效果：windows桌面上增加一个简单的遮罩层,其中ws_ex_transparent 比较重要，它实现了鼠标穿透的功能。

主要功能代码如下：

using system; 
using system.drawing; 
using system.windows.forms; 
using system.runtime.interopservices; 
namespace windowsapplication40 
{ 
  public partial class form1 : form 
  { 
    public form1() 
    { 
      initializecomponent(); 
    } 
    [dllimport("user32.dll", entrypoint = "getwindowlong")] 
    public static extern long getwindowlong(intptr hwnd, int nindex); 
 
    [dllimport("user32.dll", entrypoint = "setwindowlong")] 
    public static extern long setwindowlong(intptr hwnd, int nindex, long dwnewlong); 
 
    [dllimport("user32", entrypoint = "setlayeredwindowattributes")] 
    private static extern int setlayeredwindowattributes(intptr handle, int crkey, byte balpha, int dwflags); 
 
    const int gwl_exstyle = -20; 
    const int ws_ex_transparent = 0x20; 
    const int ws_ex_layered = 0x80000; 
    const int lwa_alpha = 2; 
 
 
    private void form1_load(object sender, eventargs e) 
    { 
      this.backcolor = color.silver; 
      this.topmost = true; 
      this.formborderstyle = formborderstyle.none; 
      this.windowstate = formwindowstate.maximized; 
      setwindowlong(handle, gwl_exstyle, getwindowlong(handle, gwl_exstyle) | ws_ex_transparent | ws_ex_layered); 
      setlayeredwindowattributes(handle, 0, 128, lwa_alpha ); 
 
    } 
  } 
}

希望本文所述对大家c#程序设计的学习有所帮助。