命名空间
using System.Runtime.InteropServices;
API
/// <summary>
/// 注册剪贴板观察链
/// </summary>
/// <param name="hwnd">当前窗口句柄</param>
/// <returns></returns>
[DllImport("user32")]
private static extern IntPtr SetClipboardViewer(IntPtr hwnd);
/// <summary>
/// 注销剪贴板观察链
/// </summary>
/// <param name="hwnd">当前句柄</param>
/// <param name="hWndNext">下一个句柄</param>
/// <returns></returns>
[DllImport("user32")]
private static extern IntPtr ChangeClipboardChain(IntPtr hwnd, IntPtr hWndNext);
/// <summary>
/// 发送消息
/// </summary>
/// <param name="hwnd"></param>
/// <param name="wMsg"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns></returns>
[DllImport("user32")]
private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam);
常量
/// <summary>
/// 776
/// 当剪贴板的内容变化时发送此消息给剪贴板观察链的窗口
/// </summary>
const int WM_DRAWCLIPBOARD = 0x308;
/// <summary>
/// 781
/// 当一个窗口从剪贴板观察链中移去时发送此消息给剪贴板观察链的窗口；
/// </summary>
const int WM_CHANGECBCHAIN = 0x30D;
使用
IntPtr NextClipHwnd;
private void Form1_Load(object sender, EventArgs e)
{
NextClipHwnd = SetClipboardViewer(this.Handle);
}
protected override void WndProc(ref System.Windows.Forms.Message m)
{
switch (m.Msg)
{
case WM_DRAWCLIPBOARD:
IDataObject iData = Clipboard.GetDataObject();
if (iData.GetDataPresent(DataFormats.Text) | iData.GetDataPresent(DataFormats.OemText)) //文本
{
this.textBox1 .Text = (String)iData.GetData(DataFormats.Text);
}
SendMessage(NextClipHwnd, m.Msg, m.WParam, m.LParam);
break;
default:
base.WndProc(ref m);
break;
}
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
ChangeClipboardChain(this.Handle, NextClipHwnd);
SendMessage(NextClipHwnd, WM_CHANGECBCHAIN, this.Handle, NextClipHwnd);
}
