CFile class

Written by Bjarke Viksoe.
This article was submitted 6/7/2001.

If you have worked with the ATL library 3.0 you have probably been needing a wrapper class for the Windows File functions. A simple class like the CFile class from MFC would cover the most urgent needs.
This wrapper class implements just that.

You get an intuitive interface to files with easy-to-remember access methods like Open() and Create(). And of course the destructor will close the file, so you don't need to remember to call Close().

The following code sample should give you an idea about how it is used:

CFile f;
if( f.Open(szFilename)==TRUE ) {
   FILETIME ftModified;
   f.GetFileTime(NULL, NULL, &ftModified);
   DWORD dwSize = f.GetSize();
   LPSTR pBuffer = (LPSTR) new CHAR[dwSize + 1];
   f.Read(pBuffer, dwSize);
   pBuffer[dwSize] = '\0';
   f.Close();
   ...
   delete [] pBuffer;
}

Interface

	Name	Description
	Create	Creates a new file
	Open	Opens an existing file.
	Close	Closes the file.
	Read	Reads a number of bytes from the file.
	Write	Writes a number of bytes to the file.
	Seek	Sets the file position.
	GetPosition	Returns the current file position.
	Flush	Flushes all uncommitted data to the file.
	DuplicateHandle	Duplicate file handle.
	GetSize	Returns the size of the file.
	GetFileTime	Returns the file creation-, modification- and access-times.
	FileExists	Returns whether a filename exists.
	Delete	Deletes a file.
	Rename	Renames a file.

Source Code Dependencies

Microsoft ATL Library

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Source Code (3 Kb)