Question

如果我将选定的网页从Firefox拖放到HTML-Kit，HTML-Kit会询问我是否要粘贴为文本或HTML。如果我选择“文字”，我会得到这个：

Version:0.9
StartHTML:00000147
EndHTML:00000516
StartFragment:00000181
EndFragment:00000480
SourceURL:http://en.wikipedia.org/wiki/Herodotus
<html><body>
<!--StartFragment-->Additional details have been garnered from the <i><a href="http://en.wikipedia.org/wiki/Suda" title="Suda">Suda</a></i>, an 11th-century encyclopaedia of the <a href="http://en.wikipedia.org/wiki/Byzantium" title="Byzantium">Byzantium</a> which likely took its information from traditional accounts.<!--EndFragment-->
</body>
</html>

According to MSDN，这是“CF_HTML”格式的剪贴板数据。在OS X和Linux系统上是否相同？

有没有办法在网页到网页的拖放操作中访问这种详细信息（而不仅仅是普通剪辑片段）？如何使用C＃WinForms桌面应用程序？

Answer 1

这是微软特有的，不要指望在其他操作系统中看到相同的信息请注意，从IE复制片段时，您将获得相同的格式。

我不确定“网页到网页拖放操作”是什么意思。要放在哪里？ textarea？

我不知道C＃，但在C / C ++应用程序中，您必须使用OpenClipboard和相关的Win32 API来获取此信息。特别是，GetClipboardData（CF_HTML）允许您获取此信息（例如，也可以以纯文本形式获取，或者使用Unicode数据等）。

Answer 2

WinForms应用可以使用Clipboard.GetText来获取它。但是，我认为没有办法在网页中进行此操作。

Answer 3

为完整起见，这是获取RAW剪贴板数据的P / Invoke Win32 API代码

using System;
using System.Runtime.InteropServices;
using System.Text;

//--------------------------------------------------------------------------------
http://metadataconsulting.blogspot.com/2019/06/How-to-get-HTML-from-the-Windows-system-clipboard-directly-using-PInvoke-Win32-Native-methods-avoiding-bad-funny-characters.html
//--------------------------------------------------------------------------------

public class ClipboardHelper
{
    #region Win32 Native PInvoke

    [DllImport("User32.dll", SetLastError = true)]
    private static extern uint RegisterClipboardFormat(string lpszFormat);
    //or specifically - private static extern uint RegisterClipboardFormatA(string lpszFormat);

    [DllImport("User32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool IsClipboardFormatAvailable(uint format);

    [DllImport("User32.dll", SetLastError = true)]
    private static extern IntPtr GetClipboardData(uint uFormat);

    [DllImport("User32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool OpenClipboard(IntPtr hWndNewOwner);

    [DllImport("User32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool CloseClipboard();

    [DllImport("Kernel32.dll", SetLastError = true)]
    private static extern IntPtr GlobalLock(IntPtr hMem);

    [DllImport("Kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool GlobalUnlock(IntPtr hMem);

    [DllImport("Kernel32.dll", SetLastError = true)]
    private static extern int GlobalSize(IntPtr hMem);

    #endregion

    public static string GetHTMLWin32Native()
    {

        string strHTMLUTF8 = string.Empty; 
        uint CF_HTML = RegisterClipboardFormatA("HTML Format");
        if (CF_HTML != null || CF_HTML == 0)
                return null;

        if (!IsClipboardFormatAvailable(CF_HTML))
            return null;

        try
        {
            if (!OpenClipboard(IntPtr.Zero))
                return null;

            IntPtr handle = GetClipboardData(CF_HTML);
            if (handle == IntPtr.Zero)
                return null;

            IntPtr pointer = IntPtr.Zero;

            try
            {
                pointer = GlobalLock(handle);
                if (pointer == IntPtr.Zero)
                    return null;

                uint size = GlobalSize(handle);
                byte[] buff = new byte[size];

                Marshal.Copy(pointer, buff, 0, (int)size);

            strHTMLUTF8 = System.Text.Encoding.UTF8.GetString(buff);
            }
            finally
            {
                if (pointer != IntPtr.Zero)
                    GlobalUnlock(handle);
            }
        }
        finally
        {
            CloseClipboard();
        }

        return strHTMLUTF8; 
    }
}

如何在网页或C＃中读取原始（CF_HTML）剪贴板数据？

3 个答案: