下面的 GetRTF() 方法可以工作,但它只检索元数据:
public string GetRTF(IntPtr handle)
{
string result = String.Empty;
using (System.IO.MemoryStream stream = new MemoryStream())
{
EDITSTREAM editStream = new EDITSTREAM();
editStream.pfnCallback = new EditStreamCallback(EditStreamProc);
editStream.dwCookie = stream;
SendMessage(handle, EM_STREAMOUT, SF_RTF, ref editStream);
stream.Seek(0, SeekOrigin.Begin);
using (StreamReader reader = new StreamReader(stream))
{
result = reader.ReadToEnd();
}
}
return result;
}
private int EditStreamProc(MemoryStream dwCookie, IntPtr pbBuff, int cb, out int pcb)
{
pcb = cb;
byte[] buffer = new byte[cb];
Marshal.Copy(pbBuff, buffer, 0, cb);
dwCookie.Write(buffer, 0, cb);
return 0;
}
private delegate int EditStreamCallback(MemoryStream dwCookie, IntPtr pbBuff, int cb, out int pcb);
[StructLayout(LayoutKind.Sequential)]
private struct EDITSTREAM
{
public MemoryStream dwCookie;
public int dwError;
public EditStreamCallback pfnCallback;
}
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr SendMessage(IntPtr hwnd, uint msg, uint wParam, ref EDITSTREAM lParam);
private const int WM_USER = 0x0400;
private const int SF_RTF = 2;
private const int EM_STREAMOUT = WM_USER + 74;
因此,当我使用富文本控件的句柄调用 GetRTF() 时,返回值为:
{\rtf1\ansi\ansicpg1252\deff0\nouicompat\deflang1033{\fonttbl{\f0\fnil\fprq2\fcharset0 Tahoma;}}{\colortbl ;\red59\green59\blue59;}{\*\generator Riched20 14.0.6015.1000;}{\*\mmathPr\mwrapIndent1440}\viewkind4\uc1\pard\cf1\f0\fs17{\pict\wmetafile0}}
但这不是富文本控件显示的文本(它只是一个电子邮件地址)。
检索我正在寻找的数据的正确方法是什么?