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MFC Example: CFile and Creating a File, Open, Write, CFile::modeCreate, CFile:: modeReadWrite

CFile is the class used for handling Files in MFC. This class can be used for creating, reading, writing and modifying files. It directly provides unbuffered, binary disk input/output services, and it indirectly supports text files and memory files through its derived classes.

CFile - Creating a File:

   There are two ways of creating files. One way is to instantiate the CFile object with the file path. This creates the file. The second way is to call the Open function. This also creates the file.

     CFile cfile_object( "c:\\test\\ucancode_cfile_example.txt", CFile::modeCreate|CFile:: modeReadWrite);

     CFile cfile_object;
     cfile_object.Open( "c:\\test\\
ucancode_cfile_example.txt
",  CFile::modeCreate|CFile:: modeReadWrite);
   
   The first parameter to both the functions (CFile() constructor and Open()) is the physical path of the file in the disk. The second parameter is an enumerated constant. This specifies the mode of opening the file object. The above constants modeCreate implies "create a new file" and modeReadWrite means "open the file for both reading and writing".

   If the file is opened without specifying the mode constant shareDenyNone, this file can be opened in read mode by other programs. This feature will be necessary for text files, logs created by programs. For creating text files we use CFile::typeText and for binary files CFile::typeBinary.

CFile - Writing to a File:

   The function Write is used to write data to the files. The sample code is as follows.

     CFile cfile_object;
     cfile_object.Open( "c:\\test\\
ucancode_cfile_example.txt", CFile::modeCreate|CFile::modeWrite);

     char szSampleText[100];
     strcpy(szSampleText, "Sample Text for CFile Write function Example");
     cfile_object.Write (szSampleText,100); 

   If there is any need to write text line by line, it is better to use the class CStdioFile.

CFile - Reading from a file:

   The function Read is used to read data from files. The sample code is,

     CFile cfile_object;
     cfile_object.Open( "c:\\test\\
ucancode
_cfile_example.txt", CFile::modeCreate|CFile::modeWrite);

     char szSampleText[100];
     UINT lBytesRead = cfile_object.Read (szSampleText,100); 

   The function returns the number of bytes read from the file. The maximum number of characters read will be the second parameter of the Read function.

CFile - closing the file:

   The Close function is used to close the file. But the close function need not be called, as the destructor will automatically call it if the file is open. So when the object goes out of scope, the destructor calls close function.

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