RT-Thread-7天网络编程课程作业 DAY1-2RT-Thread问答社区

7天网络编程课程作业 DAY1-2

发布于 2018-10-16 23:17:07 浏览：1808 订阅该版

先说思路再贴代码
跟着视频跑一遍基本例程 作业1就完成了
我把作业2和作业3和并一起完成，做了两个函数 homework1 和homework2，
homework1是在ramfs里创建了三个文件 并在1.txt文件里写入1234567890
homework2是遍历文件目录并找到1.txt,然后替换 abc

然后将这两个函数导出成两个命令行 然后运行后去执行就好了

最后贴代码 这是main.c```#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
 printf("hello rt-thread ");

return 0;
}

#include <rtthread.h> 
#include <dfs_posix.h> /* 当需要使用文件操作时，需要包含这个头文件 */

char* file_name3 =  "/3.txt";
char* file_name2 =  "/2.txt";
char* file_name1 =  "/1.txt";

char* file_buff[1024] = {0};

int homework1(void)
{
    int i = 0;
    int fd; 
    int index, length, pos;

/* 只写 & 创建 打开 */
 fd = open(file_name3,O_WRONLY | O_CREAT | O_TRUNC, 0); 
 if (fd < 0) {
 rt_kprintf("open file 3.txt for write failed ");
 return 0; 
 }else{
 rt_kprintf("open file 3.txt for write ok ");
 close(fd); 
 }

fd = open(file_name2, O_WRONLY | O_CREAT | O_TRUNC, 0); 
 if (fd < 0) {
 rt_kprintf("open file 2.txt for write failed ");
 return 0; 
 }else{
 rt_kprintf("open file 2.txt for write ok ");
 close(fd); 
 }

fd = open(file_name1, O_WRONLY | O_CREAT | O_TRUNC, 0); 
 if (fd < 0) {
 rt_kprintf("open file 1.txt for write failed ");
 return 0; 
 }else{
 rt_kprintf("step 1: open file 1.txt for write ok ");
 }

/* 写入数据 */ 
 length = write(fd, "1234567890", 10); 
 if (length != 10){ 
 rt_kprintf("write data failed "); 
 close(fd); 
 return 0; 
 }else{
 rt_kprintf("step 2: write data ok ");
 close(fd); 
 }
 return 0;
}

int homework2(void)
{
    int fd; 
    int index, length;
    DIR *dirp;
    struct dirent *d;

dirp = opendir("/"); 
 if(dirp == RT_NULL){
 rt_kprintf("open directory error! "); 
 }else { 
 /* 读取目录*/ 
 while ((d = readdir(dirp)) != RT_NULL) 
 { 
 rt_kprintf("found %s", d->d_name);
 if(strcmp(d->d_name, "1.txt") == 0){
 rt_kprintf("yes ");
 }else{
 rt_kprintf("no ", d->d_name);
 }
 } 
 fd = open(file_name1, O_WRONLY | O_CREAT | O_TRUNC, 0); 
 if (fd < 0) 
 { 
 rt_kprintf("open file for write failed "); 
 return; 
 } 
 /* 准备写入数据 */ 
 for (index = 0; index < 3; index ++) 
 { 
 file_buff[index] = 'a' + index; 
 }
 /* 写入数据 */ 
 length = write(fd, file_buff, 3); 
 if (length != 3) 
 { 
 rt_kprintf("write data failed "); 
 close(fd); 
 return; 
 } 
 /* 关闭文件 */ 
 close(fd);

/* 关闭目录 */ 
        closedir(dirp); 
    }

dirp = opendir("/web");

fd = open(file_name1, O_WRONLY , 0); 
 if (fd < 0) 
 { 
 rt_kprintf("open file for write failed "); 
 return; 
 }
 strcpy(file_buff, "abc");
 length = write(fd, file_buff, 3); 
 if (length != 3) 
 { 
 rt_kprintf("write data failed "); 
 close(fd); 
 return; 
 }
 /* 关闭文件 */ 
 close(fd); 
}

#ifdef RT_USING_FINSH 
#include <finsh.h> 
/* 输出函数到finsh shell 命令行中 */ 
MSH_CMD_EXPORT(homework1, this is a homework for part1 write); 
MSH_CMD_EXPORT(homework2, this is a homework for part1 rewrite); 
#endif```疑问1 官方文档里写的是

FINSH_FUNCTION_EXPORT
好像用不了 
MSH_CMD_EXPORT
这个可以用疑问2 strcpy(file_buff, "abc");
    length = write(fd, file_buff, 3);

填充数据后 再覆盖写入后 cat 得到的是abc,456789被截断了 小遗憾 实在没时间弄了 要休息了呀

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