Question

如何使用C语言Fread函数循环读取指定文件1.DAT，每次读取512 byte，再次读取是就是下一个512byte直至EOF

Answer 1

#include <stdio.h>
#include <stdlib.h>

int main ()
{
FILE * pFile;
long lSize;
char * buffer;
size_t result;

pFile = fopen ( "myfile.bin" , "rb" );
if (pFile==NULL)
{
fputs ("File error",stderr);
exit (1);
}

// obtain file size:
fseek (pFile , 0 , SEEK_END);
lSize = ftell (pFile);
rewind (pFile);

// allocate memory to contain the whole file:
buffer = (char*) malloc (sizeof(char)*lSize);
if (buffer == NULL)
{
fputs ("Memory error",stderr);
exit (2);
}

// copy the file into the buffer:
result = fread (buffer,1,lSize,pFile);
if (result != lSize)
{
fputs ("Reading error",stderr);
exit (3);
}

/* the whole file is now loaded in the memory buffer. */

// terminate
fclose (pFile);
free (buffer);
return 0;
}