title: CStdioFile Undeclared Identifier
body: <p>I am unable to compile my code when using a CStdioFile type.  I have included the afx.h header file but I am still receiving errors.  What I am trying to do is write a cstring that contains an entire xml document to file.  This cstring contains comments inside of it, but when I use other objects such as wofstream to write it to file, these comments are striped out for some reason.  So that is why I am trying to write this to file using CStdioFile now.  If anyone can help me out as to why I cannot compile my code using CStdioFile, or any other way to write a cstring that contains xml comments to file, please let me know!  Below is my code using CStdioFile:</p>
  
  <pre><code>CStdioFile xmlFile;
  xmlFile.Open( "c:\\test.txt", CFile::modeCreate | CFile::modeWrite | CFile::typeText );
  xmlFile.WriteString( m_sData );
  xmlFile.Close();
  </code></pre>
  
  <p>And my errors:
  error C2065: 'CStdioFile' : undeclared identifier
  error C2065: 'modeCreate' : undeclared identifier
  error C2065: 'modeWrite' : undeclared identifier
  error C2065: 'typeText' : undeclared identifier
  error C2065: 'xmlFile' : undeclared identifier
  error C2146: syntax error : missing ';' before identifier 'xmlFile'
  error C2228: left of '.Close' must have class/struct/union type    type is ''unknown-type''
  error C2228: left of '.Open' must have class/struct/union type    type is ''unknown-type''
  error C2228: left of '.WriteString' must have class/struct/union type    type is ''unknown-type''
  error C2653: 'CFile' : is not a class or namespace name
  error C2653: 'CFile' : is not a class or namespace name
  error C2653: 'CFile' : is not a class or namespace name
  error C3861: 'xmlFile': identifier not found, even with argument-dependent lookup
  error C3861: 'xmlFile': identifier not found, even with argument-dependent lookup
  error C3861: 'xmlFile': identifier not found, even with argument-dependent lookup</p>