fprintf写入字符串入文件/fread读取文件内的字符串

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

int main(void)
{
    FILE *fp = NULL;
    char name[12] = "tom";
    int age = 12; 
    int ret = 0;

    char readName[12];
    int readAge;

//    scanf("%s",name);    //不能手动输入字符串，会导致读取不出来字符
//    scanf("%d",&age);

    #if 0  //字符串写入文件
    fp = fopen("./file","w");
    if(!fp)
    {
        printf("fopen error!\n");
        return -1;
    }
    //将字符串写入fp指向文件
    ret = fprintf(fp,"%s : %d\n",name,age);
    if(ret<0) //fprintf返回写入字符数，发生错误，返回一个负值
    {
        printf("fprintf error!\n");
        return -1;    
    }
    #else 
    fp = fopen("./file","r");
    if(!fp)
    {
        printf("fopen error!\n");
        return -1;
    }
    //读取fp的内容，写入name,age内
    ret = fscanf(fp,"%s : %d",readName,&readAge);
    if(ret<0) //fprintf返回写入字符数，发生错误，返回一个负值
    {
        printf("scanf error!\n");
        return -1;    
    }

    printf("fscanf: name=%s,age=%d\n",readName,readAge);
    #endif

    free(fp);

    return 0;
}

 

转载于:https://www.cnblogs.com/linuxAndMcu/p/7583456.html