好久不写Blog了，这一个礼拜忙的要死，又是考试，又是数模，天天忙的要死，真是没有时间去弄Blog

这次把前一段时间更新Service Master时写的窗体透明代码贴到这里

WinAPI.cs类文件，Invoke & Wrap了窗体透明所需要的API函数：


[coolcode lang="cpp" download="WinAPI.cs"]
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace TransForm
{
class WinAPI
{
[DllImport("user32.dll")]
public extern static IntPtr GetDesktopWindow();

[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;

[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);

public enum WindowStyle : int
{
GWL_EXSTYLE = -20
}

public enum ExWindowStyle : uint
{
WS_EX_LAYERED = 0x00080000
}

}
}
[/coolcode]

DeviceForm.cs单元是API函数的调用方式：

[coolcode lang="cpp" download="form1.cs"]
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace TransForm
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
this.SetWindowTransparent(100);
}
private void SetWindowTransparent(byte bAlpha)
{
try
{
WinAPI.SetWindowLong(this.Handle, (int)WinAPI.WindowStyle.GWL_EXSTYLE,
WinAPI.GetWindowLong(this.Handle, (int)WinAPI.WindowStyle.GWL_EXSTYLE) | (uint)WinAPI.ExWindowStyle.WS_EX_LAYERED);

WinAPI.SetLayeredWindowAttributes(this.Handle, 0, bAlpha, WinAPI.LWA_COLORKEY | WinAPI.LWA_ALPHA);
}
catch
{
}
}
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;

cp.Parent = WinAPI.GetDesktopWindow();
cp.ExStyle = 0x00000080 | 0x00000008;//WS_EX_TOOLWINDOW | WS_EX_TOPMOST

return cp;
}
}
}
}
[/coolcode]