windows API 开发飞机订票系统 图形化界面 (四)

接下来的是录入航班、修改航班信息功能的实现：

 //录入航班
 BOOL EntryFlight(HWND hEntryDlg){

     TCHAR szDiscount[];
     TCHAR szFare[],szSeat_Number[];
     TCHAR szFlight_Number[], szDate[];
     TCHAR szDeparture[], szDestination[];
     TCHAR szTakeOff_Time[], szLanding_Time[];

     Flight *p = (Flight *)malloc(sizeof(Flight)),*q;
     if (!p){
         MessageBox(hEntryDlg, TEXT("内存申请错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
         return FALSE;
     }

     GetDlgItemText(hEntryDlg, IDC_DEPARTURE, szDeparture, );            //获取录入航班信息
     GetDlgItemText(hEntryDlg, IDC_DESTINATION, szDestination, );
     GetDlgItemText(hEntryDlg, IDC_FLTNUM, szFlight_Number, );
     GetDlgItemText(hEntryDlg, IDC_FARE, szFare, );
     GetDlgItemText(hEntryDlg, IDC_TAKEOFFTIME, szTakeOff_Time, );
     GetDlgItemText(hEntryDlg, IDC_LANDINGTIME, szLanding_Time, );
     GetDlgItemText(hEntryDlg, IDC_SEATNUM, szSeat_Number, );
     GetDlgItemText(hEntryDlg, IDC_DISCOUNT, szDiscount, );
     GetDlgItemText(hEntryDlg, IDC_DATE, szDate, );

     if (!lstrlen(szDeparture) || !lstrlen(szDestination) ||
         !lstrlen(szFlight_Number) || !lstrlen(szFare) ||
         !lstrlen(szTakeOff_Time) || !lstrlen(szLanding_Time) ||
         !lstrlen(szSeat_Number))
     {
         MessageBox(hEntryDlg, TEXT("请您填写完整航班信息！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
         return FALSE;
     }

     q = flightlink.head;
     while (q){
         if (!lstrcmp(q->Flight_Number, szFlight_Number) && !lstrcmp(q->Date,szDate)){
             MessageBox(hEntryDlg, TEXT("对不起，同一航班在一天内只能有一班"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
             free(p);
             return FALSE;
         }
         q = q->Next;
     }//while

     lstrcpy(p->Date, szDate);                            //填入录入航班结点信息
     lstrcpy(p->Discount, szDiscount);
     lstrcpy(p->Departure, szDeparture);
     lstrcpy(p->Destination, szDestination);
     lstrcpy(p->TakeOff_Time, szTakeOff_Time);
     lstrcpy(p->Landing_Time, szLanding_Time);
     lstrcpy(p->Flight_Number, szFlight_Number);
     p->Fare = _ttof(szFare);
     p->Seat_Number = _ttoi(szSeat_Number);
     p->Vacant_Seat = p->Seat_Number;
     p->Next = NULL;

     if (flightlink.head == NULL)                        //将新结点添至航班链表
         flightlink.head = p;
     else
         flightlink.tail->Next = p;
     flightlink.tail = p;
     flightlink.Flight_Number++;                            //航班数目增加

     MessageBox(hEntryDlg, TEXT("航班录入成功！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);

     return TRUE;
 }//EntryFlight()

 //修改航班信息
 BOOL ModifyFlight(HWND hModifyDlg){
     int seat_num;
     TCHAR szDiscount[];
     TCHAR szFare[], szSeat_Number[];
     TCHAR szTakeOff_Time[], szLanding_Time[];
     TCHAR Mdf_flt_num[], Mdf_flt_date[];

     OrderForm *q;
     Flight *p;

     GetDlgItemText(hModifyDlg, IDC_MDFFLTNUM, Mdf_flt_num, );                //获取要修改的航班
     GetDlgItemText(hModifyDlg, IDC_MDFDATE, Mdf_flt_date, );

     if (!lstrlen(Mdf_flt_num)){
         MessageBox(hModifyDlg, TEXT("请输入所要修改信息的航班号"), TEXT("信息"), MB_OK | MB_ICONINFORMATION);
         return FALSE;
     }

     GetDlgItemText(hModifyDlg, IDC_FARE, szFare, );                        //获取要修改的信息
     GetDlgItemText(hModifyDlg, IDC_DISCOUNT, szDiscount, );
     GetDlgItemText(hModifyDlg, IDC_SEATNUM, szSeat_Number, );
     GetDlgItemText(hModifyDlg, IDC_TAKEOFFTIME, szTakeOff_Time, );
     GetDlgItemText(hModifyDlg, IDC_LANDINGTIME, szLanding_Time, );

     p = flightlink.head;
     while (p){                                                                //查找要修改的航班
         if (!lstrcmp(Mdf_flt_num, p->Flight_Number) && !lstrcmp(Mdf_flt_date, p->Date)){
             if (lstrlen(szFare))                                            //改变航班票价
                 p->Fare = _ttof(szFare);
             if (lstrlen(szDiscount))                                        //改变航班折扣
                 wsprintf(p->Discount, szDiscount);
             if (lstrlen(szSeat_Number)){
                 seat_num = _ttoi(szSeat_Number);
                 if ((p->Seat_Number - seat_num) > p->Vacant_Seat){            //余座数量>=0
                     MessageBox(hModifyDlg, TEXT("对不起，座位数过少，请重新填写"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
                     return FALSE;
                 }
                 p->Vacant_Seat -= p->Seat_Number - seat_num;                //改变余票数量
                 p->Seat_Number = seat_num;                                    //改变座位数
             }//if
             if (lstrlen(szTakeOff_Time)){                                    //改变航班起飞时间
                 wsprintf(p->TakeOff_Time, szTakeOff_Time);
                 q = allorder.head;                                            //改变该航班所有订单出发时间
                 while (q){
                     if (!lstrcmp(q->Flight_Number, p->Flight_Number) && !lstrcmp(q->Date, p->Date))
                         wsprintf(q->TakeOff_Time, szTakeOff_Time);
                     q = q->Next;
                 }
             }//if
             if (lstrlen(szLanding_Time)){                                    //改变航班降落时间
                 wsprintf(p->Landing_Time, szLanding_Time);
                 q = allorder.head;                                            //改变该航班所有订单降落时间
                 while (q) {
                     if (!lstrcmp(q->Flight_Number, p->Flight_Number) && !lstrcmp(q->Date, p->Date))
                         wsprintf(q->Landing_Time, szLanding_Time);
                     q = q->Next;
                 }
             }//if
             MessageBox(hModifyDlg, TEXT("修改成功！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
             return TRUE;
         }//if
         p = p->Next;
     }//while

     MessageBox(hModifyDlg, TEXT("对不起，您所要修改的航班尚未录入。"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
     return FALSE;                                                            

 }//ModifyFlight()

至此，订票系统的功能已经基本全部实现了，剩下的问题就是在程序退出时将账户、航班、订单数据写进文件里。

具体实现起来很简单，需要注意的知识写入与读取要相对应。代码如下：

 //保存账户资料
 BOOL WriteAccountData(HWND hMainDlg){
     Passenger *p;
     FILE *fp;
     if ((fp = fopen(".\\AccountData.txt", "w")) == NULL){
         MessageBox(hMainDlg, TEXT("账户信息保存出现错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
         return FALSE;
     }

     p = psglink.head;
     while (p){
         fprintf(fp, "%s\n%s\n%s\n", p->Name, p->IdNum, p->PassWord);
         p = p->Next;
     }//while

     fclose(fp);
     return TRUE;
 }//WriteAccountData

 //保存订单信息
 BOOL WriteOrderData(HWND hMainDlg){
     OrderForm *p;
     FILE *fp;
     if ((fp = fopen(".\\OrderForm.txt", "w")) == NULL){
         MessageBox(hMainDlg, TEXT("订单信息保存出现错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
         return FALSE;
     }
     p = allorder.head;
     while (p){
         fprintf(fp, "%s\n", p->IdNum);
         fprintf(fp, "%d\n", p->Order_Number);
         fprintf(fp, "%d\n", p->Tickets_Num);
         fprintf(fp, "%s\n", p->Flight_Number);
         fprintf(fp, "%s\n", p->Departure);
         fprintf(fp, "%s\n", p->Destination);
         fprintf(fp, "%s\n", p->Date);
         fprintf(fp, "%s\n", p->TakeOff_Time);
         fprintf(fp, "%s\n", p->Landing_Time);
         p = p->Next;
     }//while
     fclose(fp);
     return TRUE;
 }//WriteOrderData()

 //保存航班信息
 BOOL WriteFlightData(HWND hMainDlg){
     Flight *p;
     FILE *fp;
     if ((fp = fopen(".\\FlightData.txt", "w")) == NULL){
         MessageBox(hMainDlg, TEXT("航班信息保存出现错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
         return FALSE;
     }
     p = flightlink.head;
     while (p){
         fprintf(fp, "%s\n", p->Flight_Number);
         fprintf(fp, "%.2lf\n", p->Fare);
         fprintf(fp, "%s\n", p->Discount);
         fprintf(fp, "%d\n%d\n", p->Seat_Number, p->Vacant_Seat);
         fprintf(fp, "%s\n", p->Departure);
         fprintf(fp, "%s\n", p->Destination);
         fprintf(fp, "%s\n", p->Date);
         fprintf(fp, "%s\n", p->TakeOff_Time);
         fprintf(fp, "%s\n", p->Landing_Time);
         p = p->Next;
     }//while
     fclose(fp);
     return TRUE;
 }//WriteFlight()

至此，这个飞机订票系统算是完成了，其中还是有很多不足之处。查找算法只是简单的遍历链表，数据结构也只是采用了单链表，倒是订单用上了十字链表来存储。查找起来效率不高，一旦数据量变大，便会很耗费时间，不过考虑到这只是一个课程设计，数据量很小，查找起来时间耗费上没有多少差别，姑且就这样吧。

把头文件以及其资源头文件代码就不贴出来了，想看的朋友可以直接把源码下载下来看一下。