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fwrite

Header File

stdio.h

Category

Input/output Routines

Prototype

size_t fwrite(const void *ptr, size_t size, size_t n, FILE *stream);

Description

Writes to a stream.

fwrite appends n items of data each of length size bytes to the given output file. The data written begins at ptr. The total number of bytes written is (n x size). ptr in the declarations is a pointer to any object.

Return Value

On successful completion fwrite returns the number of items (not bytes) actually written.

On error it returns a short count.

Example

Copy Code

    #include <stdio.h>
    struct mystruct
    {
      int i;
      char ch;
    };
    int main(void)
    {
       FILE *stream;
       struct mystruct s;
       if ((stream = fopen("TEST.$$$", "wb")) == NULL) /* open file TEST.$$$ */
       {
          fprintf(stderr, "Cannot open output file.\n");
          return 1;
       }
       s.i = 0;
       s.ch = 'A';
       fwrite(&s, sizeof(s), 1, stream); /* write struct s to file */
       fclose(stream); /* close file */
       return 0;
    }

Portability

POSIX | Win32 | ANSI C | ANSI C++
+ | + | + | +

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