fwrite

Write unformatted data from a buffer to a stream.

size_t fwrite( const void *buffer, size_t size, size_t count, FILE *file_pointer);

Return Values

If successful, the function returns the number of full items (not bytes) successfully written.

Example

The following example gives values to a student record, sd, and then writes it to a file using fwrite.

    #include <stdio.h>

    #ifdef unix
        char * filename = "/tmp/marks.txt";
    #else
        char * filename = "c:\\marks.txt";
    #endif

    struct student_data {
        int student_id;
        unsigned char marks[10];
    };

    FILE* file;
    struct student_data sd;
    int i;

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

    sd.student_id = 1001;

// Set the marks of student 1001

    for (i = 0; i < 10; i++)
         sd.marks[i] = (unsigned char)(85 + i);

// Write student record to the file

        i = fwrite(&sd, sizeof(struct student_data), 1, file);
    if (i > 0)
        lr_output_message ("Successfully wrote %d record", i);

    fclose(file);

Example: Output:
Successfully wrote 1 record