通讯录工程的构建（三）

对通讯录的操作都已经实现了，但前提是已经有一个通讯录了。那么第一次进入的时候我们需要建立一个通讯录，让前面的主程序读取。于是就有了这个“安装程序”，第一次运行通讯录前，让用户运行这个程序，将 数据，file_name，len 存入相应文件。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct stu
{
    int num;
    char name[20],tel[13],email[30];
    char sort;
    char yn;
    struct stu *next;
};


main()
{
    FILE *in,*f_name,*ll;
    char fname[50],ch;
    struct stu stud[15],ss[15];
    int i,len=0;

    loop:printf("
please enter the number of contacts :");
    scanf("%d",&len);
    if(len>15)
    {
        printf("
*  The number should be less than 15
");
        goto loop;
    }

    puts("

*   Tips: when you enter 'sort' information, 'a' means official, 'b' means personal, 'c' means commercial   *
");

    printf("

     *******************   Enter information   *******************

");

    for(i=0;i<len;i++)
    {
        printf("		name:  ");
        scanf("%s",stud[i].name);

        printf("		tel :  ");
        scanf("%s",stud[i].tel);

        printf("		sort:  ");
        getchar();
        stud[i].sort=getchar();
        getchar();


        printf("
		email: ");
        scanf("%s",stud[i].email);
        puts("
");
    }

    if((in=fopen("D:\telbook.dat","wb"))==NULL)
    {
        puts("cannot open the file");
        exit (0);
    }

    for(i=0;i<len;i++)
        fwrite(&stud[i],sizeof(struct stu),1,in);

    fclose(in);

    if((f_name=fopen("D:\file_name.dat","wb"))==NULL)
    {
        puts("cannot open the file");
        exit (0);
    }

    rewind(f_name);

    fputs("D:\telbook.dat",f_name);                                                         // note filename

    fclose(f_name);

    if((in=fopen("D:\len.dat","wb"))==NULL)
    {
        puts("cannot open the file");
        exit(0);
    }

    rewind(in);

    fputc(len,in);

    fclose(in);

    //check

    puts("

Check");


    if((in=fopen("D:\telbook.dat","rb"))==NULL)
    {
        puts("cannot open the file");
        exit (0);
    }

    for(i=0;i<len;i++)
        fread(&ss[i],sizeof(struct stu),1,in);

    fclose(in);

    if((f_name=fopen("D:\file_name.dat","rb"))==NULL)
    {
        puts("cannot open the file");
        exit (0);
    }

    fgets(fname,49,f_name);                                                         // note filename

    fclose(f_name);

    printf("

file name : %s


",fname);

    for(i=0;i<len;i++)
    {
        printf("		name: %s
",ss[i].name);


        printf("		tel : %s
",ss[i].tel);

        printf("		sort: %c",ss[i].sort);



        printf("
		email: %s",ss[i].email);
        puts("
");
    }

    if((ll=fopen("D:\len.dat","rb"))==NULL)
    {
        puts("cannot open the file len");
        exit(0);
    }

    rewind(ll);

    ch=fgetc(ll);

    fclose(ll);

    printf("

saved len : %d
",ch);

    //check end

}