1.2 day2 IO进程线程

使用fread、fwrite完成文件拷贝

#include <myhead.h>
int main(int argc, const char *argv[])
{if(argc!=3){printf("参数有误");}//定义并以只写的方式打开两个文件FILE *fp=NULL;FILE *cfp=NULL;if((fp=fopen(argv[1],"w"))==NULL){perror("fopen error");return -1;}if((cfp=fopen(argv[2],"w"))==NULL){perror("fopen error");return -1;}//终端输入，写入文件char buf[128]="";fgets(buf,sizeof(buf),stdin);buf[sizeof(buf)-1]='\0';fwrite(buf,strlen(buf),1,fp);fclose(fp);fclose(cfp);if((fp=fopen(argv[1],"r"))==NULL){perror("fopen error");return -1;}if((cfp=fopen(argv[2],"w"))==NULL){perror("fopen error");return -1; }//从ｆｐ中读取数据拷贝到ｃｆｐ中char rbuf[128]="";int res=fread(rbuf,1,sizeof(rbuf),fp);fwrite(rbuf,1,res,cfp);fclose(fp);fclose(cfp);return 0;
}

注册登录的框架

#include <myhead.h>int zhuce()
{FILE *fp=NULL;if((fp=fopen("./test.txt","a+"))==NULL){perror("fopen error");return -1;}char zzh[20]="";char zmm[20]="";printf("请输入注册账号:");scanf("%s",zzh);printf("请输入注册密码:");scanf("%s",zmm);fprintf(fp,"%s %s\n",zzh,zmm);printf("注册成功\n");fclose(fp);
}int denglu()
{FILE *fp=NULL;if((fp=fopen("./test.txt","a+"))==NULL){perror("fopen error");return -1;}char dzh[20]="";char dmm[20]="";char zzh[20]="";char zmm[20]="";printf("请输入账号:");scanf("%s",dzh);printf("请输入密码:");scanf("%s",dmm);while(1)//循环进行对以储存的账号密码比较{fscanf(fp,"%s %s\n",zzh,zmm);if(strcmp(dzh,zzh)==0&&strcmp(dmm,zmm)==0){printf("登陆成功\n");break;}}
}int main(int argc, const char *argv[])
{int num;while(1){printf("\t\t***********1.注册************\n");printf("\t\t***********2.登录************\n");printf("\t\t***********3.退出************\n");printf("请输入选项:");scanf("%d",&num);switch(num){case 1:{zhuce();}break;case 2:{denglu();}break;case 3:exit(EXIT_SUCCESS);default:printf("输入有误，请重新输入:");}while(getchar()!='\n');//循环吸收垃圾字符printf("按任意键清屏:");while(getchar()!='\n');system("clear");//调用指令对终端清屏}return 0;
}

图像信息的读写操作

#include <myhead.h>
int main(int argc, const char *argv[])
{FILE *fp=NULL;if((fp=fopen("./helltaker.bmp","r+"))==NULL){perror("fopen error");return -1;}unsigned char color[3]={255,0,0};fseek(fp,54,SEEK_SET);for(int i=0;i<200;i++){for(int j=0;j<1920;j++){fwrite(color,sizeof(color),1,fp);}}unsigned char coloq[3]={200,0,0};fseek(fp,54,SEEK_SET);for(int i=0;i<150;i++){for(int j=0;j<1920;j++){fwrite(coloq,sizeof(coloq),1,fp);}}unsigned char colow[3]={150,0,0};fseek(fp,54,SEEK_SET);for(int i=0;i<100;i++){for(int j=0;j<1920;j++){fwrite(colow,sizeof(colow),1,fp);}}unsigned char coloe[3]={100,0,0};fseek(fp,54,SEEK_SET);for(int i=0;i<50;i++){for(int j=0;j<1920;j++){fwrite(coloe,sizeof(coloe),1,fp);}}fclose(fp);return 0;
}