how to use the read/write

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how to use the read/write
\ yu jie (5 May 2008)
. \ Tor Lillqvist (5 May 2008)
. . \ yu jie (5 May 2008)

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Subject:	how to use the read/write
Group:	Mingw-users
From:	yu jie
Date:	5 May 2008

Hi, all:
The size of a.pdf is about 24M. I get weird result from the following code,
the read function in while condition only returns twice.

#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
int main()
{
int fd, i = 0;
ssize_t ret;
char buffer[4*1024];
fd = open("d:/a.pdf", O_RDONLY);
if (fd < 0) {
printf("can't open\n");
return 0;
}
while ((ret = read(fd, buffer, 4*1024)) > 0) {
printf("%d, %d\n", ret, ++i);
}
close(fd);
return 0;
}

Best wishes.

Kevin

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