是否有可以通过C#访问的剪贴板更改或更新事件？
为了完整起见,这是我在生产代码中使用的控件.只需从设计器拖动并双击即可创建事件处理程序.
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);
}
///
/// Clipboard contents changed.
///
public event EventHandler 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;
}
}
}
我想你将不得不使用一些p/invoke:
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);
请参阅此文章,了解如何在c#中设置剪贴板监视器
基本上,您使用注册表作为剪贴板查看器
_ClipboardViewerNext = SetClipboardViewer(this.Handle);
然后你会收到WM_DRAWCLIPBOARD消息,你可以通过覆盖来处理WndProc:
protected override void WndProc(ref Message m)
{
switch ((Win32.Msgs)m.Msg)
{
case Win32.Msgs.WM_DRAWCLIPBOARD:
// Handle clipboard changed
break;
// ...
}
}
(还有更多工作要做;沿剪贴板链传递内容并取消注册视图,但是你可以从文章中获得)
我在WPF中遇到了这个挑战,最终使用了下面描述的方法.对于Windows表单,在这个答案的其他地方有很好的例子,例如ClipboardHelper控件.
对于WPF,我们不能覆盖WndProc,因此我们必须使用窗口中的Source显式地将其与HwndSource AddHook调用挂钩.剪贴板侦听器仍使用AddClipboardFormatListener本机互操作调用.
原生方法:
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或更高版本中添加事件(例如Window.Loaded事件或在操作期间),可以在WPF窗口中使用它.(当我们有足够的信息来使用本机钩子时):
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Path of Exile项目分析器项目中使用此方法,因为当您按Ctrl-C时游戏通过剪贴板公开项目信息.
https://github.com/ColinDabritz/PoeItemAnalyzer
我希望这有助于WPF剪贴板更改处理的人!
好的,这是一篇旧帖子,但我们发现一个解决方案与目前的答案相比看起来非常简单.我们正在使用WPF,如果剪贴板包含文本,我们希望自己的自定义命令(在ContextMenu中)启用和禁用.已有ApplicationCommands.Cut,Copy和Paste,这些命令可以正确响应剪贴板更改.所以我们刚刚添加了以下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在我们自己的Command上控制CanExecute.为我们需要的东西工作,也许它会帮助其他人.
有多种方法可以做到这一点,但这是我最喜欢的,也适合我.我已经创建了一个类库,以便其他人可以添加项目并包含DLL然后只需调用它并在其应用程序中的任何地方使用它.
这个答案的帮助下做这一个.
创建类库项目并将其命名为ClipboardHelper.
用ClipboardMonitor替换Class1名称.
将以下代码添加到其中.
添加System.Windows.Forms参考.
代码下的更多步骤.
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
{
/// Specifies the standard ANSI text format. This static field is read-only.
///
/// 1
Text,
/// Specifies the standard Windows Unicode text format. This static field
/// is read-only.
/// 1
UnicodeText,
/// Specifies the Windows device-independent bitmap (DIB) format. This static
/// field is read-only.
/// 1
Dib,
/// Specifies a Windows bitmap format. This static field is read-only.
/// 1
Bitmap,
/// Specifies the Windows enhanced metafile format. This static field is
/// read-only.
/// 1
EnhancedMetafile,
/// Specifies the Windows metafile format, which Windows Forms does not
/// directly use. This static field is read-only.
/// 1
MetafilePict,
/// Specifies the Windows symbolic link format, which Windows Forms does
/// not directly use. This static field is read-only.
/// 1
SymbolicLink,
/// Specifies the Windows Data Interchange Format (DIF), which Windows Forms
/// does not directly use. This static field is read-only.
/// 1
Dif,
/// Specifies the Tagged Image File Format (TIFF), which Windows Forms does
/// not directly use. This static field is read-only.
/// 1
Tiff,
/// Specifies the standard Windows original equipment manufacturer (OEM)
/// text format. This static field is read-only.
/// 1
OemText,
/// Specifies the Windows palette format. This static field is read-only.
///
/// 1
Palette,
/// 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.
/// 1
PenData,
/// Specifies the Resource Interchange File Format (RIFF) audio format,
/// which Windows Forms does not directly use. This static field is read-only.
/// 1
Riff,
/// Specifies the wave audio format, which Windows Forms does not directly
/// use. This static field is read-only.
/// 1
WaveAudio,
/// Specifies the Windows file drop format, which Windows Forms does not
/// directly use. This static field is read-only.
/// 1
FileDrop,
/// Specifies the Windows culture format, which Windows Forms does not directly
/// use. This static field is read-only.
/// 1
Locale,
/// Specifies text consisting of HTML data. This static field is read-only.
///
/// 1
Html,
/// Specifies text consisting of Rich Text Format (RTF) data. This static
/// field is read-only.
/// 1
Rtf,
/// 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.
/// 1
CommaSeparatedValue,
/// Specifies the Windows Forms string class format, which Windows Forms
/// uses to store string objects. This static field is read-only.
/// 1
StringFormat,
/// Specifies a format that encapsulates any type of Windows Forms object.
/// This static field is read-only.
/// 1
Serializable,
}
}
在您的其他项目中右键单击解决方案并添加 - >退出项目 - > ClipboardHelper.csproj
在您的项目上转到并右键单击引用 - >添加引用 - >解决方案 - >选择ClipboardHelper.
在使用ClipboardHelper的项目类型的类文件中.
您现在可以键入ClipboardMonitor.Start或.Stop或.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...
}
}
我相信早期解决方案之一不会检查dispose方法的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);
}
///
/// Clipboard contents changed.
///
public event EventHandler 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;
}
}
}
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