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If I drag and drop a selection of a webpage from Firefox to HTML-Kit, HTML-Kit asks me whether I want to paste as text or HTML. If I select "text," I get this:
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, this is "CF_HTML" formatted clipboard data. Is it the same on OS X and Linux systems?
Is there any way to access this kind of detailed information (as opposed to just the plain clip fragment) in a webpage-to-webpage drag and drop operation? What about to a C# WinForms desktop application?
859
For completeness, here is the P/Invoke Win32 API code to get RAW clipboard data
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;
}
}
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