Initializing help system before first use

fopen

Purpose
Open a file and make it the active input, output or error stream.
Synopsis
procedure fopen(f:string, mode:integer)
Arguments
f 
The name of the file to be opened
mode 
The open mode that consists in a stream selection and optional flags. The stream is one of:
F_INPUT 
Input stream (for reading)
F_OUTPUT 
Output stream (for writing)
F_ERROR 
Error stream (for writing error messages)
Possible optional flags (to be combined with the stream selection):
F_APPEND 
Open for writing, appending new data to the end of the file (otherwise the file is cleared before opening)
F_TEXT 
Text mode (the default)
F_BINARY 
Binary mode
F_LINBUF 
If open for writing, flushes buffer after end of each line (default when writing to a console or for an error stream)
F_SILENT 
Do not display IO error messages
Further information
1. This procedure opens a file for reading or writing. If the operation succeeds, depending on the opening mode, the file becomes the active input, output or error stream. The procedures write and writeln are used to write data to the default output stream and the functions read, readln, and fskipline are used to read data from the default input stream. Error messages are sent to the error stream.
2. The behavior of this function in case of an IO error ( i.e. the file cannot be opened) is directed by the control parameter ioctrl (see setparam): if the value of this parameter is `false' (default value), the interpreter stops. Otherwise, the interpreter ignores the error and continues. The error status of an IO operation is stored in the control parameter iostatus (see getparam) which is 0 when the last operation has been executed successfully. Note that this parameter is automatically reset once its value has been read using the function getparam. The behavior of IO operations after an unhandled error is not defined.
3. The binary mode disables character encoding conversion (see section Character encoding of text files).
Related topics
fclose, fselect, getfid.

Parent Topic Predefined functions and procedures

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