我有个问题.我正在尝试将ClipboardMonitor用于我的C#应用​​程序.目标是监控剪贴板中的每个更改.
开始监控时：

AddClipboardFormatListener(this.Handle);

当停止听众时：

RemoveClipboardFormatListener(this.Handle);

和覆盖方法：

const int WM_DRAWCLIPBOARD = 0x308;
const int WM_CHANGECBCHAIN = 0x030D;

protected override void WndProc(ref Message m)
{
    switch (m.Msg)
    {
        case WM_DRAWCLIPBOARD:
            IDataObject iData = Clipboard.GetDataObject();
            if (iData.GetDataPresent(DataFormats.Text))
            {
                ClipboardMonitor_OnClipboardChange((string)iData.GetData(DataFormats.Text));
            }
            break;

        default:
            base.WndProc(ref m);
            break;
    }
}

当然还有DLL导入：

[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool AddClipboardFormatListener(IntPtr hwnd);

[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool RemoveClipboardFormatListener(IntPtr hwnd);

但是当在方法中调用一个断点时,调用ClipboardMonitor_OnClipboardChange并更改剪贴板,我从来没有得到它.

解决方法:

问题是你正在处理错误的窗口消息.引用AddClipboardFormatListener的文档：

When a window has been added to the clipboard format listener list, it is posted a WM_CLIPBOARDUPDATE message whenever the contents of the clipboard have changed.

有了这些知识,请将代码更改为：

const int WM_CLIPBOARDUPDATE = 0x031D;
protected override void WndProc(ref Message m)
{
    switch (m.Msg)
    {
        case WM_CLIPBOARDUPDATE:
            IDataObject iData = Clipboard.GetDataObject();
            if (iData.GetDataPresent(DataFormats.Text))
            {
                string data = (string)iData.GetData(DataFormats.Text);
            }
            break;


        default:
            base.WndProc(ref m);
            break;
    }
}