C语言中文件的基本读写操作

Sian

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

int write()
{
    // 文件路径
    const char *filepath = "/Users/yusian/Desktop/hello.txt";
    // 定义文件指针
    FILE *fp = fopen(filepath, "wb");
    if (fp == NULL){
        printf("Faild to open file!\n");
        return -1;
    }
    
    {   // code...
        char ip[] = "192.168.1.254";
        int port = 8080;
        
        fprintf(fp, "ip=%s\n", ip);
        fprintf(fp, "port=%d", port);
    }
    // end
    fclose(fp);
    return 0;
}

int load()
{
    const char *filepath = "/Users/yusian/Desktop/hello.txt";
    FILE *fp = fopen(filepath, "rw");
    if (fp == NULL){
        printf("Faild to open file!\n");
        return -1;
    }
    // code...
    
    char bf[512];
    
    while(!feof(fp)){
        // 按行读取
        char *line = fgets(bf, 512, fp);
        if(line){
            printf("%s", line);
        }
    }
    
    // end
    fclose(fp);
    return 0;
}

int main()
{
    write();
    load();
    return 0;
}

运行结果：

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ip=192.168.1.254
port=8080Program ended with exit code: 0