c - 将结构写入文本文件

Question

所以我最近掌握了结构的窍门，终于对数组感到满意，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，而且我很确定这么大的数组会崩溃我的程序。所以我对如何将结构备份到 txt 文件并在启动时将它们上传回我的程序感到困惑。文字会不会乱七八糟？这是我需要放入文件中的程序的主要部分。它基本上使用结构制作工资单记录。所以我只是想知道任何人都可以给我提示将其发送到文本文件中

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

可以结合使用fseek、fwrite和fread来读写和查找文件中的结构:

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);

检查返回码!