我知道如何将内容放入剪贴板并从剪贴板检索内容。
但是，在这两个操作之间，可能会有其他操作更改剪贴板的内容。
是否有一种方法可以在任何应用程序修改剪贴板时得到通知？
4个回答
21
您需要添加的唯一引用是在您的wpf应用程序中的windows表单。我创建了一个包装器来封装我在互联网上找到的功能。
大多数示例做的事情比我需要的多，所以我决定创建自己的类。我喜欢隔离问题，因此这个类只是监听剪贴板的变化，并告诉您剪贴板上的数据类型。例如，它是文本？图像？还是其他什么？
无论如何，这是我的包装器：
using System;
using System.Windows.Forms;
using System.Threading;
using System.Runtime.InteropServices;
public static class ClipboardMonitor
{
public delegate void OnClipboardChangeEventHandler(ClipboardFormat format, object data);
public static event OnClipboardChangeEventHandler OnClipboardChange;
public static void Start()
{
ClipboardWatcher.Start();
ClipboardWatcher.OnClipboardChange += (ClipboardFormat format, object data) =>
{
if (OnClipboardChange != null)
OnClipboardChange(format, data);
};
}
public static void Stop()
{
OnClipboardChange = null;
ClipboardWatcher.Stop();
}
class ClipboardWatcher : Form
{
// static instance of this form
private static ClipboardWatcher mInstance;
// needed to dispose this form
static IntPtr nextClipboardViewer;
public delegate void OnClipboardChangeEventHandler(ClipboardFormat format, object data);
public static event OnClipboardChangeEventHandler OnClipboardChange;
// start listening
public static void Start()
{
// we can only have one instance if this class
if (mInstance != null)
return;
Thread t = new Thread(new ParameterizedThreadStart(x =>
{
Application.Run(new ClipboardWatcher());
}));
t.SetApartmentState(ApartmentState.STA); // give the [STAThread] attribute
t.Start();
}
// stop listening (dispose form)
public static void Stop()
{
mInstance.Invoke(new MethodInvoker(() =>
{
ChangeClipboardChain(mInstance.Handle, nextClipboardViewer);
}));
mInstance.Invoke(new MethodInvoker(mInstance.Close));
mInstance.Dispose();
mInstance = null;
}
// on load: (hide this window)
protected override void SetVisibleCore(bool value)
{
CreateHandle();
mInstance = this;
nextClipboardViewer = SetClipboardViewer(mInstance.Handle);
base.SetVisibleCore(false);
}
[DllImport("User32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);
[DllImport("User32.dll", CharSet = CharSet.Auto)]
public static extern bool ChangeClipboardChain(IntPtr hWndRemove, IntPtr hWndNewNext);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, IntPtr lParam);
// defined in winuser.h
const int WM_DRAWCLIPBOARD = 0x308;
const int WM_CHANGECBCHAIN = 0x030D;
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case WM_DRAWCLIPBOARD:
ClipChanged();
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;
}
}
static readonly string[] formats = Enum.GetNames(typeof(ClipboardFormat));
private void ClipChanged()
{
IDataObject iData = Clipboard.GetDataObject();
ClipboardFormat? format = null;
foreach (var f in formats)
{
if (iData.GetDataPresent(f))
{
format = (ClipboardFormat)Enum.Parse(typeof(ClipboardFormat), f);
break;
}
}
object data = iData.GetData(format.ToString());
if (data == null || format == null)
return;
if (OnClipboardChange != null)
OnClipboardChange((ClipboardFormat)format, data);
}
}
}
public enum ClipboardFormat : byte
{
/// <summary>Specifies the standard ANSI text format. This static field is read-only.
/// </summary>
/// <filterpriority>1</filterpriority>
Text,
/// <summary>Specifies the standard Windows Unicode text format. This static field
/// is read-only.</summary>
/// <filterpriority>1</filterpriority>
UnicodeText,
/// <summary>Specifies the Windows device-independent bitmap (DIB) format. This static
/// field is read-only.</summary>
/// <filterpriority>1</filterpriority>
Dib,
/// <summary>Specifies a Windows bitmap format. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
Bitmap,
/// <summary>Specifies the Windows enhanced metafile format. This static field is
/// read-only.</summary>
/// <filterpriority>1</filterpriority>
EnhancedMetafile,
/// <summary>Specifies the Windows metafile format, which Windows Forms does not
/// directly use. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
MetafilePict,
/// <summary>Specifies the Windows symbolic link format, which Windows Forms does
/// not directly use. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
SymbolicLink,
/// <summary>Specifies the Windows Data Interchange Format (DIF), which Windows Forms
/// does not directly use. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
Dif,
/// <summary>Specifies the Tagged Image File Format (TIFF), which Windows Forms does
/// not directly use. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
Tiff,
/// <summary>Specifies the standard Windows original equipment manufacturer (OEM)
/// text format. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
OemText,
/// <summary>Specifies the Windows palette format. This static field is read-only.
/// </summary>
/// <filterpriority>1</filterpriority>
Palette,
/// <summary>Specifies the Windows pen data format, which consists of pen strokes
/// for handwriting software, Windows Forms does not use this format. This static
/// field is read-only.</summary>
/// <filterpriority>1</filterpriority>
PenData,
/// <summary>Specifies the Resource Interchange File Format (RIFF) audio format,
/// which Windows Forms does not directly use. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
Riff,
/// <summary>Specifies the wave audio format, which Windows Forms does not directly
/// use. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
WaveAudio,
/// <summary>Specifies the Windows file drop format, which Windows Forms does not
/// directly use. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
FileDrop,
/// <summary>Specifies the Windows culture format, which Windows Forms does not directly
/// use. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
Locale,
/// <summary>Specifies text consisting of HTML data. This static field is read-only.
/// </summary>
/// <filterpriority>1</filterpriority>
Html,
/// <summary>Specifies text consisting of Rich Text Format (RTF) data. This static
/// field is read-only.</summary>
/// <filterpriority>1</filterpriority>
Rtf,
/// <summary>Specifies a comma-separated value (CSV) format, which is a common interchange
/// format used by spreadsheets. This format is not used directly by Windows Forms.
/// This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
CommaSeparatedValue,
/// <summary>Specifies the Windows Forms string class format, which Windows Forms
/// uses to store string objects. This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
StringFormat,
/// <summary>Specifies a format that encapsulates any type of Windows Forms object.
/// This static field is read-only.</summary>
/// <filterpriority>1</filterpriority>
Serializable,
}
我知道这可能有些多，但是在包装后它应该看起来像这样：
然后你可以使用这个类：
static void Main(string[] args)
{
ClipboardMonitor.Start();
ClipboardMonitor.OnClipboardChange += new ClipboardMonitor.OnClipboardChangeEventHandler(ClipboardMonitor_OnClipboardChange);
Console.Read();
ClipboardMonitor.Stop(); // do not forget to stop
}
static void ClipboardMonitor_OnClipboardChange(ClipboardFormat format, object data)
{
Console.WriteLine("Clipboard changed and it has the format: "+format.ToString());
}
- Tono Nam
1
感谢您的实现。但它不是线程安全的，事件将在您创建的线程上引发，而不是在注册事件的线程上引发。这可能会导致UI出现问题。 - metacircle
5
我能找到的只有一个用C#/VB.NET编写的剪贴板监视器。我看到了WPF和WinForms，所以我假设这是一个可行的选项。
涉及从user32 dll中调用一些方法pinvoke。
涉及从user32 dll中调用一些方法pinvoke。
编辑
在编辑时，上面的原始链接已经失效。这里是一个archive.org快照
- Brad Christie
2
然而，在这两个操作之间，有可能会有另一个操作改变剪贴板的内容。
当一个应用程序调用OpenClipboard()时，没有其他应用程序可以使用剪贴板。一旦锁定剪贴板的应用程序调用CloseClipboard()，则任何应用程序都可以使用和锁定剪贴板。
有没有办法在任何应用程序修改剪贴板时得到通知？
是的。请参阅API SetClipboardViewer()和消息WM_DRAWCLIPBOARD和WM_CHANGECBCHAIN。
更多信息，请查看此处：http://msdn.microsoft.com/en-us/library/ms649016(v=vs.85).aspx#_win32_Adding_a_Window_to_the_Clipboard_Viewer_Chain
当一个应用程序调用OpenClipboard()时，没有其他应用程序可以使用剪贴板。一旦锁定剪贴板的应用程序调用CloseClipboard()，则任何应用程序都可以使用和锁定剪贴板。
有没有办法在任何应用程序修改剪贴板时得到通知？
是的。请参阅API SetClipboardViewer()和消息WM_DRAWCLIPBOARD和WM_CHANGECBCHAIN。
更多信息，请查看此处：http://msdn.microsoft.com/en-us/library/ms649016(v=vs.85).aspx#_win32_Adding_a_Window_to_the_Clipboard_Viewer_Chain
- user732592
0
这是我几年前写的一篇文章，详细介绍了如何通过Windows API监控剪贴板： http://www.clipboardextender.com/developing-clipboard-aware-programs-for-windows/6 请特别注意“常见错误”部分。很少有人第一次就能正确地完成。
- Chris Thornton
网页内容由stack overflow 提供, 点击上面的可以查看英文原文，
原文链接
原文链接