file.c

学生信息管理系统。C入门课设内容

#define LEN sizeof(INFO)


/* FUNCTION 010 */
/* This function is designed to output the records to a TXT file. */
void output_txt(INFO *p)
{
    FILE *fp;
    INFO *p_tmp;
    char name[15];
    extern n;
    p_tmp=p;
    printf("\nPlease enter a file name to save into\n(within 8 characters):");
    scanf("%s",name);
    fp=fopen(strcat(name,".txt"),"w+");  	/* add the suffix ".txt" */
    if(fp==NULL)
        {
         printf("Cannot open file.\n");
         return;
         }
       else printf("File opened successfully.\n");
    fprintf(fp,"\nThere are %d student info records:\n",n);
    fprintf(fp,"\nNUMBER    NAME                  GENDER  SCHOOL    MAJOR      SORT\n");

    do  
      {
        char MJR[9];
        char SCH[9];
 
        switch(p_tmp->school)
        {case 1:strcpy(SCH,"Jidian");break;
         case 2:strcpy(SCH,"Diankong");break;
         case 6:strcpy(SCH,"Shuli");break;
         case 7:strcpy(SCH,"Jisuanji");break;}
 
        switch(p_tmp->major)
        {case 0:strcpy(MJR,"Zidonghua");break;
         case 1:strcpy(MJR,"Dianxin");break;
         case 2:strcpy(MJR,"Shuxue");break;
         case 3:strcpy(MJR,"Weidianzi");break;
         case 4:strcpy(MJR,"Tongxin");break; 
         case 5:strcpy(MJR,"Jixie");break;
         case 6:strcpy(MJR,"Wuli");break; 
         case 7:strcpy(MJR,"Jisuanji");break; }

        fprintf(fp,"%-10s%-22s%c\t%-10s%-11s%c\n",
               p_tmp->number,p_tmp->name,p_tmp->gender,SCH,MJR,p_tmp->sort);
 
        p_tmp=p_tmp->next;
      }while(p_tmp!=NULL);
    printf("\nFile saved successfully!\n");
    fclose(fp);
    getch();
}


/* FUNCTION 011 */
/* This function is to load data from a binary file to memory. */
void f_load_2(INFO *p)
{
    extern n;
    INFO *p_new, *p_temp;
    FILE *fp;
    char name[15];
    p_temp=p_new=p;
    printf("\nPlease enter the binary file name to load from\n(within 8 characters):");
    scanf("%s",name);
    if((fp=fopen(strcat(name,".2"),"rb+"))==NULL)  	/* add the suffix ".2", indicating it is a binary file */
        {
         printf("Cannot open file.\n");getch();
         return;
         }
      else {printf("\nFile opened successfully!\n");getch();}
    n=0;
    fread(p_new,LEN,1,fp);
    while(!(feof(fp)))
        {
     p_temp=p_new;
     p_new=(INFO *)malloc(LEN);
         fread(p_new,LEN,1,fp);
     p_temp->next=p_new;
     n++;
     }
    p_temp->next=NULL;
    fclose(fp);
    printf("\nFile loaded successfully!\n");
    getch();
}


/* FUNCTION 012 */
/* This function is to save data from memory to a binary file. */
void f_save_2(INFO *p)
{
    FILE * fp;
    char name[15];
    printf("Please enter the file name to save in\n(within 8 characters):");
    scanf("%s",name);
    if((fp=fopen(strcat(name,".2"),"wb+"))==NULL)
        {
         printf("Cannot open file.\n");
         return;
         }
       else printf("\nFile opened successfully!\n");
    do
        {fwrite(p,LEN,1,fp);
         p=p->next; 
         }while(p!=NULL);
    fclose(fp);
    printf("\nFile saved successfully!\n");
    getch();
}



/* Function 016 */
/* Sub-menu of saving the namelist to file */
void menu_save(void)
{
 char choice_save;
 extern INFO *data_head;
 
 do
    {
     clrscr();
     printf("\n\t  ====== Save list to files ======\n");
     printf("\n  Do you want to ...\n");
     printf("\n\t 1. Save current list to a binary file.");
     printf("\n\t 2. Export current list to a TXT report.\n");
     printf("\n\t X. Quit to previous menu\n");
     printf("\n  Please choose one item:");
     scanf("%*c%c",&choice_save);
     switch(choice_save)
       {
        case 'x':
        case 'X': break;
        case '1': clrscr();f_save_2(data_head);back_print();break;
        case '2': clrscr();output_txt(data_head);back_print();break;
        }
    }while(choice_save!='x'&&choice_save!='X');
}