using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.Serialization.Formatters.Binary;
namespace _ClipboardTest_
{
public partial class Form1 : Form
{
[System.Runtime.InteropServices.DllImport("user32")]
private static extern IntPtr SetClipboardViewer(IntPtr hwnd);
[System.Runtime.InteropServices.DllImport("user32")]
private static extern IntPtr ChangeClipboardChain(IntPtr hwnd, IntPtr hWndNext);
[System.Runtime.InteropServices.DllImport("user32")]
private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam);
const int WM_DRAWCLIPBOARD = 0x308;
const int WM_CHANGECBCHAIN = 0x30D;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
//获得观察链中下一个窗口句柄
NextClipHwnd = SetClipboardViewer(this.Handle);
}
protected override void WndProc(ref System.Windows.Forms.Message m)
{
switch (m.Msg)
{
case WM_DRAWCLIPBOARD:
//将WM_DRAWCLIPBOARD消息传递到下一个观察链中的窗口
SendMessage(NextClipHwnd, m.Msg, m.WParam, m.LParam);
IDataObject iData = Clipboard.GetDataObject();
//检测文本
if (iData.GetDataPresent(DataFormats.Text) | iData.GetDataPresent(DataFormats.OemText))
{
this.richTextBox1.Text = (String)iData.GetData(DataFormats.Text);
}
//检测图像
if (iData.GetDataPresent(DataFormats.Bitmap))
{
pictureBox1.Image = Clipboard.GetImage();
MyItem item = new MyItem();
item.CopyToClipboard();
}
//检测自定义类型
if (iData.GetDataPresent(typeof(MyItem).FullName))
{
// MyItem item = (MyItem)iData.GetData(typeof(MyItem).FullName);
MyItem item = GetFromClipboard();
if (item != null)
{
this.richTextBox1.Text = item.ItemName;
}
}
break;
default:
base.WndProc(ref m);
break;
}
}
private void Form1_Closed(object sender, System.EventArgs e)
{
//从观察链中删除本观察窗口(第一个参数：将要删除的窗口的句柄；
//第二个参数：观察链中下一个窗口的句柄 )
ChangeClipboardChain(this.Handle, NextClipHwnd);
//将变动消息WM_CHANGECBCHAIN消息传递到下一个观察链中的窗口
SendMessage(NextClipHwnd, WM_CHANGECBCHAIN, this.Handle, NextClipHwnd);
}
IntPtr NextClipHwnd;
protected static MyItem GetFromClipboard()
{
MyItem item = null;
IDataObject dataObj = Clipboard.GetDataObject();
string format = typeof(MyItem).FullName;
if (dataObj.GetDataPresent(format))
{
item = dataObj.GetData(format) as MyItem;
}
return item;
}
}
[Serializable]
public class MyItem
{
public MyItem()
{
itemName = "This is a Custom Item";
}
public string ItemName
{
get { return itemName; }
}
private string itemName;

public void CopyToClipboard()
{
DataFormats.Format format = DataFormats.GetFormat(typeof(MyItem).FullName);
IDataObject dataObj = new DataObject();
dataObj.SetData(format.Name, false, this);
Clipboard.SetDataObject(dataObj, false);
}
}
}