将结构写入文本文件

Question

所以我最近得到了结构的悬念,我终于对Arrays感到满意,现在我必须处理我的教授希望我能够存储100万个结构(工资单记录)的文件,并且我非常确定一个大的阵列会使我的程序崩溃.所以我很困惑如何将结构备份到txt文件中并在启动时将它们上传回我的程序.文字会不会像一团糟一样？这是我的程序的主要部分,我需要将其放入文件中.它基本上使用结构创建工资单记录.所以我只是想知道任何人都可以给我一些关于将其发送到文本文件的提示

void payRollAdd(PAYROLL employee[], long int *pCounter){    
    int userinput;
    do{
        printf("Enter Employee Name:\n");
        fgets(employee[*pCounter].name, 40, stdin);
        printf("Please Enter the paydate(mmddyyyy):\n");
        scanf_s("%02d%02d%d", &employee[*pCounter].payDate.month, &employee[*pCounter].payDate.day, &employee[*pCounter].payDate.year);
        printf("Enter Employee Age:\n");
        scanf_s("%d", &employee[*pCounter].age);
        printf("Enter Employee Hours Worked\n");
        scanf_s("%f", &employee[*pCounter].hrsWorked);
        printf("Enter Employee Hourly Wage:\n");
        scanf_s("%f", &employee[*pCounter].hrlyWage);
        printf("  Employee Data \n");
        printf("Name: %s\n", employee[*pCounter].name);
        printf("Age:  %d\n", employee[*pCounter].age);
        printf("Pay Date: %02d/%02d/%d:\n", employee[*pCounter].payDate.month, employee[*pCounter].payDate.day, employee[*pCounter].payDate.year);
        printf("Hours Worked: %0.2f\n", employee[*pCounter].hrsWorked);
        printf("Hourly Wage: $%0.2f\n", employee[*pCounter].hrlyWage);


        if (employee[*pCounter].hrsWorked > 40.00){
            float temp = 40.00;
            employee[*pCounter].regPay = temp * employee[*pCounter].hrlyWage;
            printf("Regular pay: $%0.2f\n", employee[*pCounter].regPay);
        }
        else
        {
            employee[*pCounter].regPay = employee[*pCounter].hrsWorked * employee[*pCounter].hrlyWage;
            printf("Regular pay: $%0.2f\n", employee[*pCounter].regPay);
        }
        if (employee[*pCounter].hrsWorked > 40.00){
            float temp2 = 0.00;
            temp2 = employee[*pCounter].hrsWorked;
            temp2 -= 40.00;
            employee[*pCounter].otPay = temp2 * `(employee[*pCounter].hrlyWage + (employee[*pCounter].hrlyWage / 2.00));`
            printf("OT pay: $%0.2f\n", employee[*pCounter].otPay);
        }
        else
        {
            employee[*pCounter].otPay = 0;
            printf("OT pay: $0\n");
        }
        employee[*pCounter].totalPay = employee[*pCounter].regPay + employee[*pCounter].otPay;
        printf("Total Pay: $%0.2f\n", employee[*pCounter].totalPay);

Answer 1

您可以使用fseek,fwrite和fread的组合来读取和写入文件中的结构:

fseek(fp,0L,SEEK_END);
fwrite(&employee,sizeof(employee),1,fp);

你可以做类似的事情来读取记录:

fseek(fp,sizeof(employee) * recno,SEEK_SET);
fread(&employee,sizeof(employee),1,fp);

检查返回代码!