cannot convert parameter from 'class CStdioFile' to 'class CStdioFile'

void CLhstrackingcvDoc::SendData(CStdioFile File)
{
File.WriteString(m_strSend);
File.WriteString("\n");
}
调用：
CStdioFile myFile;
char* pszFileName="C:\\myfile.txt";
CFileException fileException;
if(myFile.Open(pszFileName,CFile::typeText|CFile::modeCreate|CFile::modeReadWrite),&fileException)
{
}
else
{
TRACE("Can't open file %s,error=%u\n",pszFileName,fileException.m_cause);
}

SendData(myFile);

提示：SendData cannot convert parameter 1 from 'class CStdioFile' to 'class CStdioFile'
解决办法：
void CLhstrackingcvDoc::SendData(CStdioFile &File)
{
File.WriteString(m_strSend);
File.WriteString("\n");
}