【无标题】0728 练习

要求创建一个time.txt，存储内容格式如下：

[1] 2022-07-28 17:15:06

[2] 2022-07-28 17:15:07

[3] 2022-07-28 17:15:08

ctrl + c退出程序，过一会儿之后重新启动程序

---

[1] 2022-07-28 17:15:06

[2] 2022-07-28 17:15:07

[3] 2022-07-28 17:15:08 <-------------------

[4] 2022-07-28 17:16:31

[5] 2022-07-28 17:16:32

#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
#include<sys/types.h>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main(int argc, const char *argv[])
{
	
	FILE *fb=fopen("./time.txt","a+");
	if(NULL==fb)
	{
		perror("fopen");
		return -1;
	}
	time_t t;
	struct tm*info=NULL;
	char a;
	while(1)
	{
		t=time(NULL);
		info=localtime(&t);
		fseek(fb,0,SEEK_SET);
		int i=0;
		while((a=fgetc(fb))!=-1)
		{
			if(a=='\n')
				i++;
		}
		printf("[%d]",i+1);
	
		printf("%d-%02d-%02d %02d:%02d:%02d\n",info->tm_year+1900,info->tm_mon+1,info->tm_mday,info->tm_hour,info->tm_min,info->tm_sec);

		fprintf(fb,"[%d] %d-%02d-%02d %02d:%02d:%02d\n",i+1,info->tm_year+1900,info->tm_mon+1,info->tm_mday,info->tm_hour,info->tm_min,info->tm_sec);
		fflush(stdout);

		sleep(1);
	}
	
	return 0;






}

1. 要求文件IO拷贝一张图片； eog 4.png
2. 附加：用标准IO拷贝一张图片

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
 
#define MSG_ERR(msg) do{\
	fprintf(stderr,"line:%d",__LINE__);\
	perror(msg);\
}while(0)

int main(int argc, const char *argv[])
{
	int fb1=open("./2.png",O_RDONLY);
	if(fb1<0)
	{
		MSG_ERR("open");
	
		return -1;
	}
	
	int fb2=open("./copy.png",O_RDWR|O_CREAT|O_TRUNC,0777);
	if(fb2<0)
	{
		MSG_ERR("open");

		return -1;
	}
	
	char c;
	while(1)
	{
		int res=read(fb1,&c,1);
		if(0==res)
			break;
		write(fb2,&c,1);
	}
	
	close(fb1);
	close(fb2);
	return 0;
}