IO进程思维导图和练习题

思维导图

1将当前的时间写入到time. txt的文件中，如果ctrl+c退出之后，在再次执行支持断点续写

1.2022-04-26 19:10:20

2.2022-04-26 19:10:21

3.2022-04-26 19:10:22

//按下ctrl+c停止，再次执行程序

4.2022-04-26 20:00:00

5.2022-04-26 20:00:01

#include <head.h>
int main(int argc, const char *argv[])
{
	FILE * fp=fopen("./time.txt","a+");
	if(NULL==fp)
		PRINT_ERROR("fopen error");
	int i=1;
	int res;
	while(res=fgetc(fp)!=EOF)
	{
		if(res=='\n')
			i++;
	}
	
	while(1)
	{
		time_t sec;
		time_t res=time(&sec);
		struct tm *t=localtime(&sec);
		if(t==NULL)
		PRINT_ERROR("localtime error");
		fprintf(fp,"%d.%d-%d-%d %02d:%02d:%02d\n",i,t->tm_year+1900,t->tm_mon+1,t->tm_mday,t->tm_hour,t->tm_min,t->tm_sec);
		fflush(fp);
	//	fscanf(fp,"%d %d %d %d %02d %02d %02d",&i,&t->tm_year+1900,&t->tm_mon+1,&t->tm_mday,&t->tm_hour,&t->tm_min,&t->tm_sec);
		
		printf("%d.%d-%d-%d %02d:%02d:%02d\n",i+k,t->tm_year+1900,t->tm_mon+1,t->tm_mday,t->tm_hour,t->tm_min,t->tm_sec);
		sleep(1);
		i++;
	}
	return 0;
}

2.使用fwrite和fread函数实现图片的拷贝

prt sc ---截图

eog 文件名 ----》打开文件

#include <head.h>
int main(int argc, const char *argv[])
{
	//1.以读取打开一个文件 
    FILE* fp1=fopen("../图片/1.png","r+");
    FILE *fp2=fopen("./cv.png","w+");
    if(NULL==fp1||NULL==fp2)
        PRINT_ERROR("fopen error");
    char buf[128]={0};
    while(fread(buf,sizeof(char),1,fp1))
    {
        if( fwrite(buf,sizeof(char),1,fp2)==0)
            return -1;
    }
    fclose(fp1);
    fclose(fp2);
	return 0;
}
ubu