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Clib.freopen() Method

This method closes the file associated with a file pointer and then opens a file and associates it with the file pointer of the file that has been closed.

Syntax

Clib.freopen(filename, mode, oldFilePointer)

Returns

A copy of the old file pointer after reassignment, or null if the function fails.

Usage

This method closes the file associated with oldFilePointer (ignoring any close errors) and then opens filename according to mode (as in Clib.fopen()) and reassociates oldFilePointer to this new file specification. It is commonly used to redirect one of the predefined file handles (stdout, stderr, stdin) to or from a file.

Example

The following sample script writes to two different files using the same filepointer.

var oFile = Clib.fopen("c:\\temp\\firstfile","w");
if (oFile == null)
{
   TheApplication().RaiseErrorText("File not found.");
}
Clib.fprintf(oFile, "Writing to first file\n");
Clib.freopen("c:\\temp\\secondfile", "w", oFile);
if (oFile == null)
{
   TheApplication().RaiseErrorText("File not found.");
}
Clib.fprintf(oFile, "Writing to second file\n");
Clib.fclose(oFile);

See Also

Clib.getenv() Method
Clib.fopen() Method