c# winform窗口置顶或置底显示的方法__IntPtr_hDesktop_DllImport_HandleRef_System_

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c# winform窗口置顶或置底显示的方法

来源: 互联网发布时间：2014-08-30

本文导语: 用c#实现winform窗口总是置顶显示在桌面最上方，或置底显示在桌面最下方，真是个实用又酷酷的功能哦。有需要的朋友，可以参看本文，学习研究下。一、窗口置顶的思路 using System.Runtime.InteropServices; 在定义部分引入下面两...

用c#实现winform窗口总是置顶显示在桌面最上方，或置底显示在桌面最下方，真是个实用又酷酷的功能哦。
有需要的朋友，可以参看本文，学习研究下。

一、窗口置顶的思路
using System.Runtime.InteropServices;
在定义部分引入下面两个函数：
[DllImport( "user32 ")]
private static extern IntPtr FindWindow(string lpClassName,string lpWindowName);
[DllImport( "user32 ")]
private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
在窗体On_Load事件中添加（Santos的代码）：
IntPtr hDeskTop=FindWindow( "Progman ", "Program Manager ");
SetParent(this.Handle,hDeskTop);
也可以通过修改桌面壁纸实现。
经测试，win2000--win2003 、xp下嵌入桌面，不支持vista和win7以上系统

二、代码
1、

代码示例:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace ShowInDesk

{

publicpartialclass Form1 : Form

{

IntPtr hDesktop;

publicconstint GW_CHILD =5;

public Form1()

{

InitializeComponent();

this.hDesktop = GetDesktopHandle(DesktopLayer.Progman);

EmbedDesktop(this, this.Handle, this.hDesktop);

isMouseDown =false;

}

public IntPtr GetDesktopHandle(DesktopLayer layer) { //hWnd = new HandleRef();

HandleRef hWnd;

IntPtr hDesktop =new IntPtr();

switch (layer)

{

case DesktopLayer.Progman:

hDesktop = Win32Support.FindWindow("Progman", null);//第一层桌面

break;

case DesktopLayer.SHELLDLL:

hDesktop = Win32Support.FindWindow("Progman", null);//第一层桌面

hWnd =new HandleRef(this, hDesktop);

hDesktop = Win32Support.GetWindow(hWnd, GW_CHILD);//第2层桌面

break;

case DesktopLayer.FolderView:

hDesktop = Win32Support.FindWindow("Progman", null);//第一层桌面

hWnd =new HandleRef(this, hDesktop);

hDesktop = Win32Support.GetWindow(hWnd, GW_CHILD);//第2层桌面

hWnd =new HandleRef(this, hDesktop);

hDesktop = Win32Support.GetWindow(hWnd, GW_CHILD);//第3层桌面

break;

}

return hDesktop;

}

publicvoid EmbedDesktop(Object embeddedWindow, IntPtr childWindow, IntPtr parentWindow)

{

Form window = (Form)embeddedWindow;

HandleRef HWND_BOTTOM =new HandleRef(embeddedWindow, new IntPtr(1));

constint SWP_FRAMECHANGED =0x0020;//发送窗口大小改变消息

Win32Support.SetParent(childWindow, parentWindow);

Win32Support.SetWindowPos(new HandleRef(window, childWindow), HWND_BOTTOM, 300, 300, window.Width, window.Height, SWP_FRAMECHANGED);

}

}

}

2、

代码示例:

using System;

using System.Collections.Generic;

using System.Text;

using System.Runtime.InteropServices;

namespace ShowInDesk

{

class Win32Support

{

[DllImport("user32.dll", CharSet = CharSet.Auto)]

publicstaticextern IntPtr FindWindow(string className, string windowName);

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling =true)]

publicstaticextern IntPtr GetWindow(HandleRef hWnd, int nCmd);

[DllImport("user32.dll")]

publicstaticextern IntPtr SetParent(IntPtr child, IntPtr parent);

[DllImport("user32.dll", EntryPoint ="GetDCEx", CharSet = CharSet.Auto, ExactSpelling =true)]

publicstaticextern IntPtr GetDCEx(IntPtr hWnd, IntPtr hrgnClip, int flags);

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling =true)]

publicstaticexternbool SetWindowPos(HandleRef hWnd, HandleRef hWndInsertAfter, int x, int y, int cx, int cy, int flags);

[DllImport("user32.dll")]

publicstaticexternint ReleaseDC(IntPtr window, IntPtr handle);

}

}

3、

代码示例:

namespace ShowInDesk

{

publicenum DesktopLayer

{

Progman =0,

SHELLDLL =1,

FolderView =2

}

}

三、窗口置底，在桌面最底层
此类将窗体永远置于窗口最底层。
首先, 调用一些User32.dll的WinAPI函数。

代码示例:

internal class User32

{

public const int SE_SHUTDOWN_PRIVILEGE =0x13;

[DllImport("user32.dll")]

public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

[DllImport("user32.dll")]

public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

[DllImport("user32.dll")]

public static externbool SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int X, int Y, int cx,

int cy, uint uFlags);

}

然后, 在WinForm里面：

代码示例:

public MainForm()

{

InitializeComponent();

try

{

if (Environment.OSVersion.Version.Major =6)

{

User32.SetWindowPos(base.Handle, 1, 0, 0, 0, 0, User32.SE_SHUTDOWN_PRIVILEGE);

}

}

private void MainForm_Paint(object sender, PaintEventArgs e)

{

if (Environment.OSVersion.Version.Major >=6)

{

User32.SetWindowPos(base.Handle, 1, 0, 0, 0, 0, User32.SE_SHUTDOWN_PRIVILEGE);

}

}

还是那句话，学编程，重在多看多练，大家实际动手测试一下上面的代码吧。