如何使用read系统调用从用户那里获取输入并使用write system调用将其存储在文件中。在C. [英] How do I take input from user using read system call and store in a file using write system call. In C

问题描述

我现在一直在论坛上，我正在寻求进一步的帮助。



Jochen一直在帮助我，但我没有关注一些东西。



如果有人能帮助我告诉我我的代码是否正确我会很高兴



如果错了，具体修改是什么。



我尝试过：

I have been on the forum now and I am looking for further help.

Jochen has been helping me out , however I am not following some stuff.

I would be glad if someone could just help me with letting me know if the code I have is correct or not

If its wrong, what is the exact modification to be made.

What I have tried:

#define USERNAME_SIZE 10

int main()
{
	
	int fd;
	
	fd = fd("user.dat", O_CREAT | O_RWDR, 0666);
	if (fd == -1)
	{
		write(1,"There is an error opening the file",35);
	}
	
	write(1,"Enter the username",18);
	
	
  char username[USERNAME_SIZE];
  char c;
  int count = 0;
   do
    {
    read(0, &c, 1);
    if (c == '\n')
   break;
    username[count++] = c;
    }
   while (count < USERNAME_SIZE - 1);
    username[count] = 0;
	
	write(fd,username,count);
	
	close(fd);
	
	return 0;
}

推荐答案

为什么使用低级别读取获得用户输入？使用友好的系统调用，如 gets_s，_getws_s [ ^ ]读取完整的字符串。



此外，您还没有解释您的程序有什么问题。

Why are you using the low level read to get user input? Use a friendly system call like gets_s, _getws_s[^] which reads a complete string.

Also, you have not explained what is wrong with your program.

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