解决办法如下：

（1）、将写入字符串转换编码为：ANSI

	char* pBuffer = NULL;
	long lBufferSize;

	lBufferSize = WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, m_sRtf, -1, NULL, 0, NULL, NULL);
	pBuffer = new char[lBufferSize + 1];
	WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, m_sRtf, -1, pBuffer, lBufferSize + 1, NULL, NULL);

	CFile file(_T("E://a.rtf"), CFile::modeCreate | CFile::modeWrite);
	file.Write(pBuffer, lBufferSize);
	file.Close();

</pre><pre name="code" class="cpp"><span style="font-size:24px;">（2）、写入之前调用如下函数：</span>

<span style="font-size:24px;"></span>

</pre><pre name="code" class="cpp"><span style="white-space:pre">	</span>char* old_locale = _strdup( setlocale(LC_CTYPE,NULL) );
	setlocale( LC_CTYPE, "chs" );

</pre><pre name="code" class="cpp"> <span style="font-size:24px;">（3）、写入结束后调用如下函数：</span>

<span style="white-space:pre">	</span>setlocale( LC_CTYPE, old_locale );
	free( old_locale );//还原区域设定

CStdioFile::WriteString 不能写入中文问题