www.pudn.com > IntMail.rar > WinAPI.cs

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Runtime.InteropServices; 
 
namespace IntMail 
{ 
    class WinAPI 
    { 
        [DllImport("user32.dll")] 
        public extern static IntPtr GetWindow(); 
 
        [DllImport("user32.dll")] 
        public extern static bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags); 
        public static uint LWA_COLORKEY = 0x00000001; 
        public static uint LWA_ALPHA = 0x00000002; 
 
        #region 阴影效果变量 
        //声明Win32 API 
        [DllImport("user32.dll", CharSet = CharSet.Auto)] 
        public static extern int SetClassLong(IntPtr hwnd, int nIndex, int dwNewLong); 
        [DllImport("user32.dll", CharSet = CharSet.Auto)] 
        public static extern int GetClassLong(IntPtr hwnd, int nIndex); 
        [DllImport("user32.dll")] 
        public extern static uint SetWindowLong(IntPtr hwnd, int nIndex, uint dwNewLong); 
        [DllImport("user32.dll")] 
        public extern static uint GetWindowLong(IntPtr hwnd, int nIndex); 
        #endregion 
 
        public enum WindowStyle : int 
        { 
            GWL_EXSTYLE = -20 
        } 
 
        public enum ExWindowStyle : uint 
        { 
            WS_EX_LAYERED = 0x00080000 
        } 
 
    } 
}