将文件中数据一次性全部读出并打印。

文件示例

文件名：json_str3.txt
文件内容：

{ 
    "people": [
        { 
            "firstName": "z",
            "lastName": "Jason",
            "email": "bbbb@126.com",
            "height": 1.67
        },
        { 
            "lastName": "jadena",
            "email": "jadena@126.com",
            "age": 8,
            "height": 1.17
        },
        { 
            "email": "cccc@126.com",
            "firstName": "z",
            "lastName": "Juliet",
            "age": 36,
            "height": 1.55
        }
    ]
}

C语言程序实现

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char **argv)
{ 
	FILE *f;
	int len;
	char *data;
	
	f=fopen("json_str3.txt","rb");
	fseek(f,0,SEEK_END);
	len=ftell(f);
	fseek(f,0,SEEK_SET);
	data=(char*)malloc(len+1);
	fread(data,1,len,f);
	fclose(f);
	printf("data :\n%s\n", data);
	return 0;
}

结果