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){//獲得觀察鏈中下一個(gè)窗口句柄NextClipHwnd = SetClipboardViewer(this.Handle);}protected override void WndProc(ref System.Windows.Forms.Message m){switch (m.Msg){case WM_DRAWCLIPBOARD://將WM_DRAWCLIPBOARD消息傳遞到下一個(gè)觀察鏈中的窗口SendMessage(NextClipHwnd, m.Msg, m.WParam, m.LParam);IDataObject iData = Clipboard.GetDataObject();//檢測文本if (iData.GetDataPresent(DataFormats.Text) | iData.GetDataPresent(DataFormats.OemText)){this.richTextBox1.Text = (String)iData.GetData(DataFormats.Text);}//檢測圖像if (iData.GetDataPresent(DataFormats.Bitmap)){pictureBox1.Image = Clipboard.GetImage();MyItem item = new MyItem();item.CopyToClipboard();}//檢測自定義類型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){//從觀察鏈中刪除本觀察窗口(第一個(gè)參數(shù)：將要?jiǎng)h除的窗口的句柄；//第二個(gè)參數(shù)：觀察鏈中下一個(gè)窗口的句柄 )ChangeClipboardChain(this.Handle, NextClipHwnd);//將變動(dòng)消息WM_CHANGECBCHAIN消息傳遞到下一個(gè)觀察鏈中的窗口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);}}}