【7天入门RTOS网络编程】Young day1-2 作业

发布于 2018-10-17 20:21:15 浏览：1187 订阅该版

* 本帖最后由 爱喝柠檬水 于 2018-10-25 21:19 编辑 *

**替换字符串函数代码：**
```void Replace_char()
{
int fd;
int length;
char *p_str;
p_str = strstr(buffer,"123"); //查找字符串 123
if(p_str == NULL)
{
rt_kprintf("Did not found 123 ");
}
else
{
rt_kprintf("Start replace! "); 
strncpy(p_str,"abc",3); //替换字符串123为abc
}
rt_kprintf("Replace Done! ");
//写入替换后的字符串
fd = open("/1.txt",O_WRONLY,0);
if(fd>=0)
{
 write(fd,buffer,sizeof(buffer));
 close(fd);
 rt_kprintf("Current 1.txt:%s ",buffer);
}
}```
**查找目录下文件函数代码：**
```void dir_operation()
{
 int fd;
 DIR *dirp; 
 struct dirent *d;

dirp = opendir("/"); //打开SD0 文件系统目录
 if(dirp == RT_NULL)
 {
 rt_kprintf("Open directory error!");
 }
 else
 {
 while((d = readdir(dirp))!=RT_NULL) //查找文件
 {
 rt_kprintf("found %s ",d->d_name);
 }
 closedir(dirp);
 }

fd = open("1.txt",O_RDONLY,0);     //读取1.txt文件内容并存入buffer
    if(fd>=0)
    {
        read(fd,buffer,sizeof(buffer));
        close(fd);
    }
}```

**效果展示如下：**
![BE)4_Y_N8$57T3OAQKSMD{R.png](/uploads/201810/17/202038r9g9goarrnrmunqo.png)
![`FU{]J_Z7J}54`HRS(TW}TC.png](/uploads/201810/17/202038gnszv41t4w8p0w8v.png)
![L]%7I$5DE$Q(~HEE%$)]`_6.png](/uploads/201810/17/202038rlsugjzg33ucmugz.png)