一个窗体特效，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。
- 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 );
- }
- }
- }