Simple binary File I/O problem with cstdio(c++)
- by Atilla Filiz
The c++ program below fails to read the file. I know using cstdio is not good practice but that what I am used to and it should work anyway.
$ ls -l l.uyvy
-rw-r--r-- 1 atilla atilla 614400 2010-04-24 18:11 l.uyvy
$ ./a.out l.uyvy
Read 0 bytes out of 614400, possibly wrong file
code:
#include<cstdio>
int main(int argc, char* argv[])
{
FILE *fp;
if(argc<2)
{
printf("usage: %s <input>\n",argv[0]);
return 1;
}
fp=fopen(argv[1],"rb");
if(!fp)
{
printf("erör, cannot open %s for reading\n",argv[1]);
return -1;
}
int bytes_read=fread(imgdata,1,2*IMAGE_SIZE,fp); //2bytes per pixel
fclose(fp);
if(bytes_read < 2*IMAGE_SIZE)
{
printf("Read %d bytes out of %d, possibly wrong file\n",
bytes_read, 2*IMAGE_SIZE);
return -1;
}
return 0;
}
