在C#中是否有可访问的剪贴板更改或更新事件?
为了完整性,这是我在生产代码中使用的控件。只需从设计师处拖动并双击创建事件处理程序即可。
using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing;
namespace ClipboardAssist {
// Must inherit Control, not Component, in order to have Handle
[DefaultEvent("ClipboardChanged")]
public partial class ClipboardMonitor : Control
{
IntPtr nextClipboardViewer;
public ClipboardMonitor()
{
this.BackColor = Color.Red;
this.Visible = false;
nextClipboardViewer = (IntPtr)SetClipboardViewer((int)this.Handle);
}
/// <summary>
/// Clipboard contents changed.
/// </summary>
public event EventHandler<ClipboardChangedEventArgs> ClipboardChanged;
protected override void Dispose(bool disposing)
{
ChangeClipboardChain(this.Handle, nextClipboardViewer);
}
[DllImport("User32.dll")]
protected static extern int SetClipboardViewer(int 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);
protected override void WndProc(ref System.Windows.Forms.Message m)
{
// defined in winuser.h
const int WM_DRAWCLIPBOARD = 0x308;
const int WM_CHANGECBCHAIN = 0x030D;
switch (m.Msg)
{
case WM_DRAWCLIPBOARD:
OnClipboardChanged();
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;
}
}
void OnClipboardChanged()
{
try
{
IDataObject iData = Clipboard.GetDataObject();
if (ClipboardChanged != null)
{
ClipboardChanged(this, new ClipboardChangedEventArgs(iData));
}
}
catch (Exception e)
{
// Swallow or pop-up, not sure
// Trace.Write(e.ToString());
MessageBox.Show(e.ToString());
}
}
}
public class ClipboardChangedEventArgs : EventArgs
{
public readonly IDataObject DataObject;
public ClipboardChangedEventArgs(IDataObject dataObject)
{
DataObject = dataObject;
}
}
}
protected override void Dispose(bool disposing)
{
if (nextClipboardViewer != IntPtr.Zero)
{
ChangeClipboardChain(this.Handle, nextClipboardViewer);
nextClipboardViewer = IntPtr.Zero;
}
base.Dispose(disposing);
}
- SprottyClipboardChanged
事件,并在剪切/复制时检测各种数据格式。 - Willy Kimura我认为你需要使用一些p/invoke:
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);
基本上,您需要使用以下代码将应用程序注册为剪贴板查看器:
_ClipboardViewerNext = SetClipboardViewer(this.Handle);
接着您会收到WM_DRAWCLIPBOARD
消息,您可以通过重写WndProc
来处理它:
protected override void WndProc(ref Message m)
{
switch ((Win32.Msgs)m.Msg)
{
case Win32.Msgs.WM_DRAWCLIPBOARD:
// Handle clipboard changed
break;
// ...
}
}
还有更多需要完成的工作,例如将东西沿着剪贴板链传递并注销您的视图,但您可以从文章中获取这些信息。
ClipboardChanged
事件,并在剪切/复制时检测各种数据格式。 - Willy Kimura在WPF中我遇到了这个问题,最终采用下面描述的方法解决。对于Windows Forms来说,在本答案的其他地方有出色的示例,例如ClipboardHelper控件。
在WPF中,我们无法覆盖WndProc,因此必须使用窗口的Source通过HwndSource AddHook调用来显式地挂钩它。剪贴板监听器仍然使用AddClipboardFormatListener本机Interop调用。
本机方法:
internal static class NativeMethods
{
// See http://msdn.microsoft.com/en-us/library/ms649021%28v=vs.85%29.aspx
public const int WM_CLIPBOARDUPDATE = 0x031D;
public static IntPtr HWND_MESSAGE = new IntPtr(-3);
// See http://msdn.microsoft.com/en-us/library/ms632599%28VS.85%29.aspx#message_only
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool AddClipboardFormatListener(IntPtr hwnd);
}
剪贴板管理器类:
using System.Windows;
using System.Windows.Interop;
public class ClipboardManager
{
public event EventHandler ClipboardChanged;
public ClipboardManager(Window windowSource)
{
HwndSource source = PresentationSource.FromVisual(windowSource) as HwndSource;
if(source == null)
{
throw new ArgumentException(
"Window source MUST be initialized first, such as in the Window's OnSourceInitialized handler."
, nameof(windowSource));
}
source.AddHook(WndProc);
// get window handle for interop
IntPtr windowHandle = new WindowInteropHelper(windowSource).Handle;
// register for clipboard events
NativeMethods.AddClipboardFormatListener(windowHandle);
}
private void OnClipboardChanged()
{
ClipboardChanged?.Invoke(this, EventArgs.Empty);
}
private static readonly IntPtr WndProcSuccess = IntPtr.Zero;
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (msg == NativeMethods.WM_CLIPBOARDUPDATE)
{
OnClipboardChanged();
handled = true;
}
return WndProcSuccess;
}
}
通过在OnSourceInitialized事件中添加该事件或稍后添加,例如Window.Loaded事件或在操作期间添加到WPF窗口中使用(当我们有足够的信息来使用本地钩子):
这可以在WPF窗口中使用,在OnSourceInitialized事件中添加该事件或稍后添加,例如在Window.Loaded事件或操作期间。 (当我们有足够的信息来使用本机挂钩):
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
// Initialize the clipboard now that we have a window soruce to use
var windowClipboardManager = new ClipboardManager(this);
windowClipboardManager.ClipboardChanged += ClipboardChanged;
}
private void ClipboardChanged(object sender, EventArgs e)
{
// Handle your clipboard update here, debug logging example:
if (Clipboard.ContainsText())
{
Debug.WriteLine(Clipboard.GetText());
}
}
}
我在“流亡之路”物品分析项目中使用此方法,因为游戏在按下Ctrl-C时通过剪贴板公开物品信息。
https://github.com/ColinDabritz/PoeItemAnalyzer
希望这能对需要处理WPF剪贴板变化的人有所帮助!
好的,这是一篇旧帖子,但我们找到了一个看起来比当前答案组简单得多的解决方案。我们正在使用WPF,并希望在ContextMenu中启用和禁用我们自己的自定义命令(如果剪贴板包含文本)。已经有ApplicationCommands.Cut、Copy和Paste,这些命令对剪贴板变化做出正确响应。所以我们只需添加以下EventHandler。
ApplicationCommands.Paste.CanExecuteChanged += new EventHandler(Paste_CanExecuteChanged);
private void Paste_CanExecuteChanged(object sender, EventArgs e) {
ourVariable= Clipboard.ContainsText();
}
我们实际上是通过这种方式来控制自己的命令的CanExecute。 对于我们需要的内容有效,并且也许会帮助其他人。
using System;
using System.Windows.Forms;
using System.Threading;
using System.Runtime.InteropServices;
namespace ClipboardHelper
{
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;
var 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)]
private static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);
[DllImport("User32.dll", CharSet = CharSet.Auto)]
private static extern bool ChangeClipboardChain(IntPtr hWndRemove, IntPtr hWndNewNext);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private 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,
}
}
You may now type ClipboardMonitor.Start or .Stop or .OnClipboardChanged
using ClipboardHelper;
namespace Something.Something.DarkSide
{
public class MainWindow
{
public MainWindow()
{
InitializeComponent();
Loaded += MainWindow_Loaded;
}
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
ClipboardMonitor.OnClipboardChange += ClipboardMonitor_OnClipboardChange;
ClipboardMonitor.Start();
}
private void ClipboardMonitor_OnClipboardChange(ClipboardFormat format, object data)
{
// Do Something...
}
}
ClipboardChanged
事件,并在剪切/复制时检测各种数据格式。var clipboard = new SharpClipboard();
clipboard.ObservableFormats.Texts = true;
clipboard.ObservableFormats.Files = true;
clipboard.ObservableFormats.Images = true;
clipboard.ObservableFormats.Others = true;
ClipboardChanged
事件:private void ClipboardChanged(Object sender, ClipboardChangedEventArgs e)
{
// Is the content copied of text type?
if (e.ContentType == SharpClipboard.ContentTypes.Text)
{
// Get the cut/copied text.
Debug.WriteLine(clipboard.ClipboardText);
}
// Is the content copied of image type?
else if (e.ContentType == SharpClipboard.ContentTypes.Image)
{
// Get the cut/copied image.
Image img = clipboard.ClipboardImage;
}
// Is the content copied of file type?
else if (e.ContentType == SharpClipboard.ContentTypes.Files)
{
// Get the cut/copied file/files.
Debug.WriteLine(clipboard.ClipboardFiles.ToArray());
// ...or use 'ClipboardFile' to get a single copied file.
Debug.WriteLine(clipboard.ClipboardFile);
}
// If the cut/copied content is complex, use 'Other'.
else if (e.ContentType == SharpClipboard.ContentTypes.Other)
{
// Do something with 'e.Content' here...
}
}
private void ClipboardChanged(Object sender, SharpClipboard.ClipboardChangedEventArgs e)
{
// Gets the application's executable name.
Debug.WriteLine(e.SourceApplication.Name);
// Gets the application's window title.
Debug.WriteLine(e.SourceApplication.Title);
// Gets the application's process ID.
Debug.WriteLine(e.SourceApplication.ID.ToString());
// Gets the application's executable path.
Debug.WriteLine(e.SourceApplication.Path);
}
还有其他事件,比如MonitorChanged
事件,它监听剪贴板监视被禁用的情况,这意味着您可以在运行时启用或禁用监视剪贴板。
除此之外,由于它是一个组件,您可以通过将其拖放到Windows窗体中的设计视图中使用它,使任何人都能轻松自定义其选项并使用其内置事件。
SharpClipboard似乎是.NET中监视剪贴板场景的最佳选择。
我认为早期的解决方案在dispose方法上没有检查null:
using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing;
namespace ClipboardAssist {
// Must inherit Control, not Component, in order to have Handle
[DefaultEvent("ClipboardChanged")]
public partial class ClipboardMonitor : Control
{
IntPtr nextClipboardViewer;
public ClipboardMonitor()
{
this.BackColor = Color.Red;
this.Visible = false;
nextClipboardViewer = (IntPtr)SetClipboardViewer((int)this.Handle);
}
/// <summary>
/// Clipboard contents changed.
/// </summary>
public event EventHandler<ClipboardChangedEventArgs> ClipboardChanged;
protected override void Dispose(bool disposing)
{
if(nextClipboardViewer != null)
ChangeClipboardChain(this.Handle, nextClipboardViewer);
}
[DllImport("User32.dll")]
protected static extern int SetClipboardViewer(int 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);
protected override void WndProc(ref System.Windows.Forms.Message m)
{
// defined in winuser.h
const int WM_DRAWCLIPBOARD = 0x308;
const int WM_CHANGECBCHAIN = 0x030D;
switch (m.Msg)
{
case WM_DRAWCLIPBOARD:
OnClipboardChanged();
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;
}
}
void OnClipboardChanged()
{
try
{
IDataObject iData = Clipboard.GetDataObject();
if (ClipboardChanged != null)
{
ClipboardChanged(this, new ClipboardChangedEventArgs(iData));
}
}
catch (Exception e)
{
// Swallow or pop-up, not sure
// Trace.Write(e.ToString());
MessageBox.Show(e.ToString());
}
}
}
public class ClipboardChangedEventArgs : EventArgs
{
public readonly IDataObject DataObject;
public ClipboardChangedEventArgs(IDataObject dataObject)
{
DataObject = dataObject;
}
}
}
base.Dispose()
。 - jedmao在剪贴板查看器中,您可能会遇到另一个问题:在一段时间后,它停止接收WM_DRAWCLIPBOARD消息(似乎剪贴板链已经被某种方式打破)。 我找到的唯一解决方案是,如果发现了断开的链路,则重新注册剪贴板查看器。
为了满足我的需求,我创建了nuget包https://github.com/magicmanam/windows-clipboard-viewer,它包装了所有需要的Windows消息处理,并提供了刷新剪贴板查看器的方法。该包的描述包含使用示例。
[DllImport("User32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);
private IntPtr _ClipboardViewerNext;
private void Form1_Load(object sender, EventArgs e)
{
_ClipboardViewerNext = SetClipboardViewer(this.Handle);
}
protected override void WndProc(ref System.Windows.Forms.Message m)
{
const int WM_DRAWCLIPBOARD = 0x308;
switch (m.Msg)
{
case WM_DRAWCLIPBOARD:
//Clipboard is Change
//your code..............
break;
default:
base.WndProc(ref m);
break;
}
}
还有一个答案(在2022年我知道!):
如果您在控制台应用程序中,您需要使用[STAThread]才能监视剪贴板(并导入System.Windows.Forms以获取Clipboard类)。
SharpClipboard特别是在[STAThread]环境中也不会工作。
using System;
using System.Windows.Forms;
class Main {
[STAThread]
static void Main() {
if (Clipboard.ContainsText()) {
string text = Clipboard.GetText();
Console.Writeline(text);
}
}
}
编辑:
也许可以钩取DLL函数来访问剪贴板,而无需导入System.Windows.Forms。
SharpClipboard
NuGet 包添加到您的项目中即可。 - BrainSlugs83