Writing CR/LF Combination Using CFile::Write() Function

MS-DOS | WINDOWS             | WINDOWS NT

The information in this article applies to:

• The Microsoft Foundation Classes (MFC), included with:

      - Microsoft C/C++ version 7.0
      - Microsoft Visual C++ for Windows, versions 1.0, 1.5, 1.51, and
        1.52
      - Microsoft Visual C++ 32-bit Edition, versions 1.0, 2.0, 2.1, 4.0, 4.1
  

SUMMARY

In an application developed with the Microsoft Foundation Classes (MFC) that uses the CFile class, the Write() member function may appear not to correctly process the carriage return-linefeed (CR/LF) combination unless both the carriage return and linefeed are explicitly stated.

For example, the following code

   CFile file;

   // ...

   file.Write("Hello\n", 6);
   file.Write("Hello\n", 6);

Hello

     Hello

However, the following code

   file.Write("Hello\n\r", 7);
   file.Write("Hello\n\r", 7);

Hello Hello

MORE INFORMATION

When an application uses the CStdioFile class derived from CFile, an application can open a file in either text mode or binary mode. Using a CStdioFile object is the preferred method to place a CR/LF combination into a file. However, if the application must use a CFile object, a CR/LF combination may be explicitly output as demonstrated above.