1> 使用fread和fwrite完成两个文件的拷贝

#include <myhead.h>
int main(int argc, const char *argv[])
{//定义被复制文件指针FILE *fp1=NULL;if((fp1=fopen("./111.bmp","r"))==NULL){perror("error open");return -1;}//定义目标文件指针FILE *fp2=NULL;if((fp2=fopen("./333.bmp","w+"))==NULL){perror("error open");return -1;}//定义字符串数组存储读取的数据char str[1024]="";int res=0;while((res=fread(str,1,sizeof(str),fp1))>0){fwrite(str,1,res,fp2);}fclose(fp1);fclose(fp2);return 0;
}

2> 使用read、write完成两个文件的拷贝

#include <myhead.h>
int main(int argc, const char *argv[])
{//定义被复制文件标识符int fd1=-1;if((fd1=open("./111.bmp",O_RDONLY))==-1){perror("open error");return -1;}//定义目标文件标识符int fd2=-1;if((fd2=open("./222.bmp",O_RDWR|O_CREAT|O_TRUNC,0664))==-1){perror("open error");return -1;}//定义数组存储读取的数据char str[1024]="";int t;while((t=read(fd1,str,sizeof(str)))>0){write(fd2,str,t);//向目标文件写入}//关闭文件close(fd1);close(fd2);return 0;
}

3> 将时间在文件中跑起来

#include <myhead.h>
int main(int argc, const char *argv[])
{FILE *fp=NULL;if((fp=fopen("./Time.txt","w+"))==NULL){perror("open error");return -1;}int n=1；char T[1024]="";char Tr[1024]="";while(1){sleep(1);time_t sysTime=time(NULL);struct tm *t=localtime(&sysTime);fseek(fp,0,SEEK_SET);snprintf(T,sizeof(T),"%d:%d-%d-%d %d:%d:%d\n",n,t->tm_year+1900,t->tm_mon+1,t->tm_mday,t->tm_hour,t->tm_min,t->tm_sec);	fwrite(T,strlen(T),1,fp);fseek(fp,0,SEEK_SET);fread(Tr,strlen(T),1,fp);printf("%s",Tr);n++;}fclose(fp);return 0;
}