用这段代码找文本为什么文本输一多就找不到？(50分)

用以下代码找richedit里的文本<br>Var<br>Ret:LongInt;<br>mTextChar;<br>Buf:Integer;<br>begin<br>&nbsp; Ret:=SendMessage(qqformid,WM_GETTEXTLENGTH,0,0)+1;<br>&nbsp; GetMem(mText,Ret);<br>&nbsp; try<br>&nbsp; &nbsp; Buf:=LongInt(mText);<br>&nbsp; &nbsp; SendMessage(hWnd,WM_GETTEXT,Ret,Buf);<br>&nbsp; &nbsp; Result:=StrPas(mText);<br>&nbsp; finally<br>&nbsp; &nbsp; FreeMem(mText,Ret);<br>&nbsp; end;<br>用这段代码找文本为什么文本输一多就找不到？

？qqformid &nbsp;和 hWnd &nbsp;，这两个是同一个句柄吗？