C#读取剪切板(Clipboard)中的数据的方法

1 自定义一个类,并且保证它的可序列化的:实现ISerializable接口;或者用[Serializable]标记(如果有父类,则父类也需要被标记;可以[NonSerialized()]标记类中不想被序列化的字段)

   2 注册自定义数据格式:调用静态方法DataFormats.GetFormat()

   3 保存数据到clipboard:利用IdataObject接口,创建一个数据对象,并设置数据;调用Clipboard.SetDataObject()方法

   4 从clipboard获取数据:调用DataObject 实例的GetDataPresent()保证数据格式与应用程序兼容;调用IDataObject 的GetData()方法获取数据

   示例程序:
 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);
}
}
}

posted @ 2011-06-01 15:56  陌香  阅读(18114)  评论(1编辑  收藏  举报