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