文件的读取&拷贝
#include <stdio.h>
#include <stdlib.h>
void main()
{
FILE *fp;
long int size;
char * buff;
if ((fp=fopen("test.msi","rb"))==NULL) {
printf("cannot open file/n");
exit(1);
}
fseek(fp,0,SEEK_END);
size=ftell(fp);
buff=(char *) malloc(size);
fseek(fp,0,SEEK_SET);
int iSize = fread(buff,1,size,fp);
if (iSize != size) {
printf("read error!!");
}
}
注意， 在打开文件的时候一定要用‘rb’选项，以二进制打开，否则fread读到的长度就不准确
拷贝文件的代码
/*
* FCOPY.C - copy one file to another. Returns the (positive)
* number of bytes copied, or -1 if an error occurred.
* by: Bob Jarvis
*/
#include <stdio.h>
#include <stdlib.h>
#define BUFFER_SIZE 1024
long fcopy(char *dest, char *source)
{
FILE *d, *s;
char *buffer;
size_t incount;
long totcount = 0L;
s = fopen(source, "rb");
if(s == NULL)
return -1L;
d = fopen(dest, "wb");
if(d == NULL)
{
fclose(s);
return -1L;
}
buffer = malloc(BUFFER_SIZE);
if(buffer == NULL)
{
fclose(s);
fclose(d);
return -1L;
}
incount = fread(buffer, sizeof(char), BUFFER_SIZE, s);
while(!feof(s))
{
totcount += (long)incount;
fwrite(buffer, sizeof(char), incount, d);
incount = fread(buffer, sizeof(char), BUFFER_SIZE, s);
}
totcount += (long)incount;
fwrite(buffer, sizeof(char), incount, d);
free(buffer);
fclose(s);
fclose(d);
return totcount;
}