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;
}

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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;
}

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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;
}

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