HP Integrity NonStop J-Series - Manual (Page 86)

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©Copyright 1996 Rogue Wave Software
Example
Class RWFile also has member functions to determine the status of a file, and to read and write a
wide variety of built-in types, either one at a time, or as arrays. The file pointer may be
repositioned with functions SeekTo(), SeekToBegin(), and SeekToEnd(). The details of the
RWFile class capabilities are summarized in the Class Reference.
The following example creates an RWFile with filename test.dat. The code reads an int (if the
file is not empty), increments it, and writes it back to the file:
#include
main(){
RWFile file("test.dat"); // Construct the RWFile.
// Check that the file exists, and that it has
// read/write permission:
if ( file.Exists() )
{
int i = 0;
// Read the int if the file is not empty:
if ( !file.IsEmpty() ) file.Read(i);
i++;
file.SeekToBegin();
file.Write(i); // Rewrite the int.
}
return 0;
}