fopen command

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Synopsis

fopen [ <string> ] <string>

fopen is undoable, queryable, and editable.

This command defaults to opening a file for writing and returns a file identifier.

The optional mode string may be one of the following:

"w" open file for writing (destroys prior contents of file).

"a" append for writing (appends to end of file).

"r" open for reading.

A "+" optionally after the mode character opens for both reading and writing.

If an error occurs while attempting to open the file, fopen will return zero. For more information see the C implementation of the function fopen.

Return value

int

In query mode, return type is based on queried flag.

fclose, feof, fflush, fgetline, fgetword, fprint, fread, frewind, fwrite, pclose, popen

MEL examples

// Open a file for writing, the default behavior of the command
//
$exampleFileName = ( `internalVar -userTmpDir` + "example.tmp" );
$fileId=`fopen $exampleFileName`;
fprint $fileId "Hello there\n";
fclose $fileId;

// OR

// Do the same as above, but include the "w" argument to explicitly
// say that we wish to open the file for writing
//
$exampleFileName = ( `internalVar -userTmpDir` + "example.tmp" );
$fileId=`fopen $exampleFileName "w"`;
fprint $fileId "Hello there\n";
fclose $fileId;