C#制作鼠标可以穿透的窗体

2011-11-11 2:54

转载自

最终编辑

把窗体的FormBorderStyle设为FormBorderStyle.None

using System.Runtime.InteropServices;

 

        private const uint WS_EX_LAYERED = 0x80000;

        private const int WS_EX_TRANSPARENT = 0x20;

        private const int GWL_STYLE = (-16);

        private const int GWL_EXSTYLE = (-20);

        private const int LWA_ALPHA = 0x2;

        [DllImport("user32", EntryPoint = "SetWindowLong")]

        private static extern uint SetWindowLong(

        IntPtr hwnd,

        int nIndex,

        uint dwNewLong

        );

        [DllImport("user32", EntryPoint = "GetWindowLong")]

        private static extern uint GetWindowLong(

        IntPtr hwnd,

        int nIndex

        );

        [DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]

        private static extern int SetLayeredWindowAttributes(

        IntPtr hwnd,

        int crKey,

        int bAlpha,

        int dwFlags

        );

        /// <summary>

        /// 使窗口有鼠标穿透功能

        /// </summary>

        public void CanPenetrate()

        {

            uint intExTemp = GetWindowLong(this.Handle, GWL_EXSTYLE);

            uint oldGWLEx = SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);

            SetLayeredWindowAttributes(this.Handle, 0, 100, LWA_ALPHA);

        }

要时窗体恢复正常，只要执行以下语句：

                this.FormBorderStyle = FormBorderStyle.None;