c - 为什么 fread() 在文件读取期间失败？

Question

为什么我得到:

fread() failed

我在 VS 2010 中运行这段代码

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

#define SIZE 1
#define NUMELEM 5

int main(void)
{
    FILE* fd = NULL;
    char buff[100];
    memset(buff,0,sizeof(buff));

    printf(" Starting to open");

    fd = fopen("test","r+");

    if(NULL == fd)
    {
        printf("\n fopen() Error!!!\n");
        return 1;
    }

    printf("\n File opened successfully through fopen()\n");

    if(SIZE*NUMELEM != fread(buff,SIZE,NUMELEM,fd))
    {
        printf("\n fread() failed\n");
        return 1;
    }

Answer 1

因为你还没有读过 documentation fread()。它返回 NUMELEM，不 SIZE * NUMELEM。