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。
[csharp]class="Apple-converted-space"> view plaincopy
- using System;
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- using System.Drawing;
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- using System.Windows.Forms;
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- using System.Runtime.InteropServices;
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- namespace WindowsApplication40
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- {
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- public partial class Form1 : Form
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- {
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- public Form1()
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- {
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- InitializeComponent();
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- }
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- [DllImport("user32.dll", EntryPoint = "GetWindowLong")]
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- public static extern long GetWindowLong(IntPtr hwnd, int nIndex);
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-
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- [DllImport("user32.dll", EntryPoint = "SetWindowLong")]
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- public static extern long SetWindowLong(IntPtr hwnd, int nIndex, long dwNewLong);
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-
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- [DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]
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- private static extern int SetLayeredWindowAttributes(IntPtr Handle, int crKey, byte bAlpha, int dwFlags);
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-
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- const int GWL_EXSTYLE = -20;
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- const int WS_EX_TRANSPARENT = 0x20;
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- const int WS_EX_LAYERED = 0x80000;
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- const int LWA_ALPHA = 2;
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-
-
-
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- private void Form1_Load(object sender, EventArgs e)
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- {
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- this.BackColor = Color.Silver;
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- this.TopMost = true;
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- this.FormBorderStyle = FormBorderStyle.None;
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- this.WindowState = FormWindowState.Maximized;
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- SetWindowLong(Handle, GWL_EXSTYLE, GetWindowLong(Handle, GWL_EXSTYLE) | WS_EX_TRANSPARENT | WS_EX_LAYERED);
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- SetLayeredWindowAttributes(Handle, 0, 128, LWA_ALPHA );
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-
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- }
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- }
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- }