1、常規方法
在C#中,有一個常規檢測剪貼板的方法,用的是 System.Windows.Forms.Clipboard;
使用起來很簡單,代碼如下:
/// <summary>
/// 設置剪貼板的文本內容
/// </summary>
/// <param name="s">文本內容</param>
public static void SetText(string s)
{
Clipboard.SetDataObject(s ?? "");
}
/// <summary>
/// 獲取剪貼板中的文本內容
/// </summary>
/// <returns>返回剪貼板文本</returns>
public static string GetText()
{
IDataObject iData = Clipboard.GetDataObject();
return (string)iData.GetData(DataFormats.Text);
}
/// <summary>
/// 獲取剪貼板位圖格式數據(比如從畫圖軟件裏複製的圖片……)
/// </summary>
/// <returns>位圖</returns>
public static Bitmap GetBitmap()
{
IDataObject iData = Clipboard.GetDataObject();
//確定此實例中存儲的數據是否與指定的格式關聯,或是否可以轉換成指定的格式
if (iData.GetDataPresent(DataFormats.Bitmap))
{
Bitmap bt = (Bitmap)iData.GetData(DataFormats.Bitmap);
return bt;
}
return null;
}
2、通知檢測剪貼板
常規方法沒有通知來告訴我們有數據,所以再來一個帶通知的方案:
這個代碼比較長……
public partial class Form2 : Form
{
IntPtr nextClipboardViewer;
public Form2()
{
InitializeComponent();
nextClipboardViewer = (IntPtr)SetClipboardViewer((int)Handle);
}
/// <summary>
/// 要處理的 WindowsSystem.Windows.Forms.Message。
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref Message m)
{
// defined in winuser.h
const int WM_DRAWCLIPBOARD = 0x308;
const int WM_CHANGECBCHAIN = 0x030D;
switch (m.Msg)
{
case WM_DRAWCLIPBOARD:
DisplayClipboardData();
SendMessage(nextClipboardViewer, m.Msg, m.WParam, m.LParam);
break;
case WM_CHANGECBCHAIN:
if (m.WParam == nextClipboardViewer)
nextClipboardViewer = m.LParam;
else
SendMessage(nextClipboardViewer, m.Msg, m.WParam, m.LParam);
break;
default:
base.WndProc(ref m);
break;
}
}
/// <summary>
/// 顯示剪貼板內容
/// </summary>
public void DisplayClipboardData()
{
try
{
IDataObject iData = new DataObject();
iData = Clipboard.GetDataObject();
if (iData.GetDataPresent(DataFormats.Rtf))
richTextBox1.Rtf = (string)iData.GetData(DataFormats.Rtf);
else if (iData.GetDataPresent(DataFormats.Text))
richTextBox1.Text = (string)iData.GetData(DataFormats.Text);
else
richTextBox1.Text = "[Clipboard data is not RTF or ASCII Text]";
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
}
/// <summary>
/// 關閉程序,從觀察鏈移除
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Form2_FormClosed(object sender, FormClosedEventArgs e)
{
ChangeClipboardChain(Handle, nextClipboardViewer);
}
#region WindowsAPI
/// <summary>
/// 將CWnd加入一個窗口鏈,每當剪貼板的內容發生變化時,就會通知這些窗口
/// </summary>
/// <param name="hWndNewViewer">句柄</param>
/// <returns>返回剪貼板觀察器鏈中下一個窗口的句柄</returns>
[DllImport("User32.dll")]
protected static extern int SetClipboardViewer(int hWndNewViewer);
/// <summary>
/// 從剪貼板鏈中移出的窗口句柄
/// </summary>
/// <param name="hWndRemove">從剪貼板鏈中移出的窗口句柄</param>
/// <param name="hWndNewNext">hWndRemove的下一個在剪貼板鏈中的窗口句柄</param>
/// <returns>如果成功,非零;否則爲0。</returns>
[DllImport("User32.dll", CharSet = CharSet.Auto)]
public static extern bool ChangeClipboardChain(IntPtr hWndRemove, IntPtr hWndNewNext);
/// <summary>
/// 將指定的消息發送到一個或多個窗口
/// </summary>
/// <param name="hwnd">其窗口程序將接收消息的窗口的句柄</param>
/// <param name="wMsg">指定被髮送的消息</param>
/// <param name="wParam">指定附加的消息特定信息</param>
/// <param name="lParam">指定附加的消息特定信息</param>
/// <returns>消息處理的結果</returns>
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam);
#endregion
}
認真看一下並不難理解,這種帶通知的方式更方便操作。
3、代碼
另外代碼打了個包(Form1是方案一,Form2是方案二)
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