Share this page

# rewind

Input-Output Functions

Rewinds a file.

    void rewind( FILE *file_pointer);

file_pointer | A pointer to the file to rewind.

For rewind details, refer to your C language documentation.

## Return Values

This function has no return value.

## Example

This example creates a log file and writes the following to it:

- the string "Vuser"

- the integer "Vuser ID"

the time, as returned by the time function.

To read these values back again, the file cursor is moved to the beginning of the file, using rewind.

    #include <time.h>
    #include <stdio.h>
            #ifdef unix
                char *filename = "/tmp/logfile.txt";
            #else
                char *filename = "c:\\logfile.txt";
            #endif

        FILE* file, thetime;
        int id, id2;
        time_t t;
        char s[32];

        // Create a new file

        if ((file = fopen(filename, "w+" )) == NULL) {
            lr_output_message ("Unable to create %s", filename);
            return -1;
        }

        // Write the Vuser ID and time

        lr_whoami (&id, NULL, NULL);
        fprintf(file, "Vuser %d %ld", id, time(&t));

        // Now read what we've just written. Rewind to start of file

        rewind(file);
        fscanf(file, "%s", &s);
        fscanf(file, "%d", &id2);
        fscanf(file, "%ld", &thetime);
        lr_output_message ("%s %d %ld", s, id2, thetime);
        fclose(file);

    Example: Output:
    Vuser -1 1020675497

Tips to improve your search results... VuGen Function Reference Version 26.1 Function Reference 26.1 All View Local Help Center View Online Help Center Version: