剪贴板监视器

Question

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);

但是当在方法调用中设置断点ClipboardMonitor_OnClipboardChange并更改剪贴板时,我从未接触到它.

Answer 1

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

将一个窗口添加到剪贴板格式侦听器列表后,WM_CLIPBOARDUPDATE只要剪贴板的内容发生更改,就会向其发送一条消息.

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;
    }
}