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CStdioFile is a wrapper on CFile with additional methods. This gives the facility to read a single line of string from a text file. It also has write function to write a line of string to a file.

String read/write

CStdioFile::ReadString - Reads a single line of text and put in the CString argument passed as reference.

CStdioFile::WriteString Writes a single line of string to a file and adds a newline character at the end.

ReadString example

#include "stdafx.h"
CWinApp theApp;
using namespace std;
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
  CStdioFile textFile;
10    CString strLine;
12    /*initialize MFC and print and error on failure */
13    if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
14    {
15      cerr << _T("Fatal Error: MFC initialization failed") << endl;
16      return 1;
17    }
18    if (argc < 2)
19    {
20      cerr << "Give a text file as input";
21      retun -1;
22    }
23    /* Open a text file as given in argument */
24    if(textFile.Open(argv[1], CFile::modeRead|CFile::typeText) != TRUE)
25    {
26      cout << "cannot open file ";
27      return -1;
28    }
29    /*Read one line at a time and print in console */
30    while(textFile.ReadString(strLine) != NULL)
31    {
32      cout << (LPCTSTR)strLine << endl;
33    }
34    textFile.Close();
35    return 0;
36  }

ReadString output

We are printing our own program source file using our executable.

C:\>StdioFileDemo.exe StdioFileDemo.cpp

#include "stdafx.h"

CWinApp theApp;

using namespace std;

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
  CStdioFile textFile;
  CString strLine;
  /*initialize MFC and print and error on failure */
  if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
    cerr << _T("Fatal Error: MFC initialization failed") << endl;
    return 1;
  if (argc < 2)
    cerr << "Give a text file as input";
    retun -1;
  /* Open a text file as given in argument */
  if(textFile.Open(argv[1], CFile::modeRead|CFile::typeText) != TRUE)
    cout << "cannot open file ";
    return -1;
  /*Read one line at a time and print in console */
  while(textFile.ReadString(strLine) != NULL)
    cout << (LPCTSTR)strLine << endl;
  return 0;

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#Programming Windows, Fifth Edition (Developer Reference)
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#Programming Windows with MFC, Second Edition
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#Programming Microsoft Visual C++, Fifth Edition

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