从一个流中读数据

[c]代码库

#include <string.h>
#include <stdio.h>

int main ( void )
{
	FILE *stream;
	char msg[] = "this is a test";
	char buf[20];

	if ( ( stream = fopen ( "DUMMY.FIL", "w+" ) )
	        == NULL )
	{
		fprintf ( stderr,
		          "Cannot open output file.\n" );
		return 1;
	}

	/* write some data to the file */
	fwrite ( msg, strlen ( msg ) +1, 1, stream );

	/* seek to the beginning of the file */
	fseek ( stream, SEEK_SET, 0 );

	/* read the data and display it */
	fread ( buf, strlen ( msg ) +1, 1, stream );
	printf ( "%s\n", buf );

	fclose ( stream );
	return 0;
}