How To Test for End of File with CFile and CStdioFile (88769)
The information in this article applies to:
- The Microsoft Foundation Classes (MFC), when used with:
- Microsoft Visual C++ for Windows, 16-bit edition 1.0
- Microsoft Visual C++ for Windows, 16-bit edition 1.5
- Microsoft Visual C++ for Windows, 16-bit edition 1.51
- Microsoft Visual C++ for Windows, 16-bit edition 1.52
- Microsoft Visual C++, 32-bit Editions 1.0
- Microsoft Visual C++, 32-bit Editions 2.0
- Microsoft Visual C++, 32-bit Editions 2.1
- Microsoft Visual C++, 32-bit Editions 2.2
- Microsoft Visual C++, 32-bit Editions 4.0
This article was previously published under Q88769 SUMMARY
The Microsoft Foundation Classes (MFC) provide a CFileException class. The
CFileException class includes public data members that contain operating-
system errors and C Run-time errors that may be generated by certain file
operations.
MORE INFORMATION
The CFile and CStdioFile classes may throw a CFileException when certain
error conditions occur; however, these classes do not throw a
CFileException when the end of file is reached. If an application using the
CFile or CStdioFile class needs to check for the end-of-file condition when
reading from a file, the return values from the Read() and ReadString()
member functions should be checked.
CFile::Read returns the actual number of bytes read. If this number is less
than the bytes requested, then the end of file has been reached.
CStdioFile::ReadString returns a NULL pointer when the end of file has been
reached.
| Modification Type: | Minor | Last Reviewed: | 7/13/2004 |
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| Keywords: | kbFileIO kbhowto KB88769 |
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