是否有可以通过C#访问的剪贴板更改或更新的事件?
答案 0 :(得分:73)
为了完整性,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);
}
/// <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;
}
}
}
答案 1 :(得分:70)
我认为你必须使用一些p / invoke:
[DllImport("User32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);
请参阅this article on how to set up a clipboard monitor in c#
基本上,您使用
将您的应用注册为剪贴板查看器_ClipboardViewerNext = SetClipboardViewer(this.Handle);
然后您将收到WM_DRAWCLIPBOARD
消息,您可以通过覆盖WndProc
来处理该消息:
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;在剪贴板链上传递内容并取消注册视图,但您可以从the article获取
答案 2 :(得分:22)
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(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“流亡之路”项目分析器项目中使用此方法,因为当您按Ctrl-C时,游戏会通过剪贴板显示项目信息。
https://github.com/ColinDabritz/PoeItemAnalyzer
我希望这可以帮助有WPF剪贴板更改处理的人!
答案 3 :(得分:10)
好的,所以这是一篇旧帖子,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。
答案 4 :(得分:9)
有多种方法可以做到这一点,但这是我的最爱,也适合我。我创建了一个类库,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。
这个答案是在this one的帮助下完成的。
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
{
/// <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,
}
}
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...
}
}
答案 5 :(得分:6)
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);
}
/// <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;
}
}
}
答案 6 :(得分:4)
here是使用AddClipboardFormatListener
的一个很好的例子。
为了做到这一点,我们需要对AddClipboardFormatListener
和RemoveClipboardFormatListener
进行异议。
/// <summary>
/// Places the given window in the system-maintained clipboard format listener list.
/// </summary>
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool AddClipboardFormatListener(IntPtr hwnd);
/// <summary>
/// Removes the given window from the system-maintained clipboard format listener list.
/// </summary>
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool RemoveClipboardFormatListener(IntPtr hwnd);
/// <summary>
/// Sent when the contents of the clipboard have changed.
/// </summary>
private const int WM_CLIPBOARDUPDATE = 0x031D;
然后我们需要通过使用窗口的句柄作为参数调用AddClipboardFormatListener
方法将我们的窗口添加到剪贴板格式侦听器列表。将以下代码放在主窗口窗体构造函数或其任何加载事件中。
AddClipboardFormatListener(this.Handle); // Add our window to the clipboard's format listener list.
覆盖WndProc
方法,以便我们可以在发送 WM_CLIPBOARDUPDATE 时捕获。
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_CLIPBOARDUPDATE)
{
IDataObject iData = Clipboard.GetDataObject(); // Clipboard's data.
/* Depending on the clipboard's current data format we can process the data differently.
* Feel free to add more checks if you want to process more formats. */
if (iData.GetDataPresent(DataFormats.Text))
{
string text = (string)iData.GetData(DataFormats.Text);
// do something with it
}
else if (iData.GetDataPresent(DataFormats.Bitmap))
{
Bitmap image = (Bitmap)iData.GetData(DataFormats.Bitmap);
// do something with it
}
}
}
最后确保在关闭表单之前从剪贴板格式侦听器列表中删除主窗口。
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
RemoveClipboardFormatListener(this.Handle); // Remove our window from the clipboard's format listener list.
}
答案 7 :(得分:1)
SharpClipboard作为一种库可能会更有好处,因为它将相同的功能封装到一个精细的组件库中。然后,您可以访问其ClipboardChanged
事件,并在剪切/复制它们时检测各种数据格式。
您可以选择要监视的各种数据格式:
var clipboard = new SharpClipboard();
clipboard.ObservableFormats.Texts = true;
clipboard.ObservableFormats.Files = true;
clipboard.ObservableFormats.Images = true;
clipboard.ObservableFormats.Others = true;
以下是使用其ClipboardChanged
事件的示例:
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...
}
}
您还可以找出发生剪切/复制事件的应用程序及其详细信息:
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,例如MonitorChanged
事件,它在禁用剪贴板监视时会监听,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,由于它是组件,因此您可以通过将其拖放到Windows窗体中,在 Designer View 中使用它,这使任何人都可以非常轻松地自定义其选项并处理其内置事件。
SharpClipboard似乎是.NET中剪贴板监视方案的最佳选择。
答案 8 :(得分:0)
[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;
}
}
答案 9 :(得分:0)
剪贴板查看器可能会遇到的另一个问题:一段时间后它停止接收 WM_DRAWCLIPBOARD 消息(似乎剪贴板链不知何故损坏)。 我找到的唯一解决方案是在发现链断裂时重新注册剪贴板查看器。
为了我的需要,我创建了 nuget 包 https://github.com/magicmanam/windows-clipboard-viewer,它包装了所有需要的 Windows 消息的处理,并提供了刷新剪贴板查看器的方法。包的描述包含使用示例