windows API 开发飞机订票系统图形化界面 (三)

来吧，接下来是各个功能的函数的实现代码。

首先，程序运行时加载读入账户信息和航班信息。接下来就该读取文件了。

我把账户资料和航班信息储存在了.txt文件里

那么问题就来了，挖掘机...额，不对，应该怎么读入账户资料和航班信息？

每一行是结构体的一个成员，我读入的方式是一行一行读入。

两个读入函数代码如下：

 1 //读入账户信息
 2 BOOL ReadAccountData(HWND hwndDlg){                        
 3     
 4     FILE *fp;
 5 
 6     passenger = (Passenger *)malloc(sizeof(Passenger));                                        //为登录账户分配内存
 7     if (!passenger){
 8         MessageBox(hwndDlg, TEXT("内存申请错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
 9         EndDialog(hwndDlg, 0);
10         return FALSE;
11     }//if
12      
13     psglink.head = NULL;
14     psglink.tail = NULL;
15     psglink.PsgNum = 0;
16 
17     if ((fp = fopen(".\AccountData.txt", "r+")) == NULL){        //打开文件
18         MessageBox(hwndDlg, TEXT("账户文件读入错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
19         EndDialog(hwndDlg, 0);
20     }//if        
21 
22     while (!feof(fp)){
23         Passenger *p = (Passenger *)malloc(sizeof(Passenger));
24         if (!p){
25             MessageBox(hwndDlg, TEXT("内存申请错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
26             EndDialog(hwndDlg, 0);
27             return FALSE;
28         }//if
29 
30         //读入账户姓名、身份证号、密码
31         if (fscanf(fp, "%s%s%s", p->Name, p->IdNum, p->PassWord) == EOF){
32             free(p); break;
33         }
34 
35         p->Next = NULL;
36         if (psglink.head == NULL)                        //读入第一个账户信息时，头、尾结点均指向p
37             psglink.head = p;
38         else
39             psglink.tail->Next = p;                        //否则，尾结点Next指向p
40         psglink.tail = p;                                //尾结点指向p
41         psglink.PsgNum++;                                //已注册账户个数
42 
43     }//while
44     fclose(fp);                                            //关闭文件
45     return TRUE;
46 }//ReadAccountData(HWND)
47 
48 
49 //读入航班信息
50 BOOL ReadFlightData(HWND hwndDlg){                        
51 
52     int flag = 0;
53     FILE *fp;
54 
55     flightlink.Flight_Number = 0;
56     flightlink.head = NULL;
57     flightlink.tail = NULL;
58 
59     if ((fp = fopen(".\FlightData.txt", "r")) == NULL){        //打开文件
60         MessageBox(hwndDlg, TEXT("账户文件读入错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
61         EndDialog(hwndDlg, 0);
62     }//if
63 
64     while (!feof(fp)){
65         Flight *p = (Flight *)malloc(sizeof(Flight));
66         if (!p){
67             MessageBox(hwndDlg, TEXT("内存申请错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
68             EndDialog(hwndDlg, 0);
69             return FALSE;
70         }//if
71         //读入航班信息
72         if (fscanf(fp, "%s%lf%s%d%d%s%s%s%s%s",
73             p->Flight_Number,
74             &p->Fare,
75             p->Discount,
76             &p->Seat_Number,
77             &p->Vacant_Seat,
78             p->Departure,
79             p->Destination,
80             p->Date,
81             p->TakeOff_Time,
82             p->Landing_Time) == EOF)
83         {
84             free(p);
85             break;
86         }
87         p->Next = NULL;
88         if (flightlink.head == NULL)                    //添加至链表
89             flightlink.head = p; 
90         else
91             flightlink.tail->Next = p;
92         flightlink.tail = p;
93         flightlink.Flight_Number++;
94 
95     }//while
96     fclose(fp);                                            //关闭文件
97     return TRUE;
98 }//ReadFlightData()

因为开发环境是vs2013,所以编译时会报错，报错信息是大体是说fopen()函数不安全，根据提示信息，解决办法是在文件头部做如下定义：

1 #define _CRT_SECURE_NO_WARNINGS

或者是在项目->属性->c/c++->预处理器->预处理器定义，后面加上_CRT_SECURE_NO_WARNINGS就行了。

结下来又遇到问题了：程序退出把数据写入txt文件时每行末尾都会有一个，读入数据的时候用的是feof()函数，而feof()返回的其实是"最后一次读操作的内容"，与数据库中的eof()不同，eof()读取的是当前指针位置。因此在读到文件末尾的时候，程序会多执行一次循环，为了防止这种情况，我采取的是检查fscanf()返回值的方法，在此以读入账户资料时为例：

1 //读入账户姓名、身份证号、密码
2 if (fscanf(fp, "%s%s%s", p->Name, p->IdNum, p->PassWord) == EOF){
3     free(p); break;
4 }

然后是用户登录或注册时所用到的函数：

 1 //登陆用户验证
 2 BOOL AccountLogIn(HWND hwndDlg){                        
 3     
 4     int flag = 0;                                                                //flag！=0则该用户已注册，flag==0则该用户尚未注册
 5     Passenger *p;
 6 
 7     GetDlgItemText(hwndDlg, IDC_IDEDIT, passenger->IdNum, 256);                    //获取用户输入ID
 8     GetDlgItemText(hwndDlg, IDC_PSWEDIT, passenger->PassWord, 256);                //获取用户输入密码
 9     
10     p = psglink.head;
11     while (p){                                                                    //在用户链表查找登陆用户ID
12         if (!lstrcmp(passenger->IdNum, p->IdNum)){        
13             flag++;                                                                //该用户已注册
14             if (!lstrcmp(passenger->PassWord, p->PassWord)){                    //密码匹配，登陆成功
15                 lstrcpy(passenger->Name, p->Name);
16                 MessageBox(hwndDlg, TEXT("登陆成功，单击确定进入程序主界面"), TEXT("登陆成功"), MB_OK | MB_ICONINFORMATION);
17                 break;
18             }//if
19             else{                                                                //密码错误，退出循环
20                 MessageBox(hwndDlg, TEXT("密码错误，请重新输入"), TEXT("密码错误"), MB_OK | MB_ICONERROR);
21                 return FALSE;
22             }//else
23         }//if
24         p = p->Next;
25     }//while
26     if (!flag){                                                                    //用户尚未注册
27         if (lstrlen(passenger->PassWord)==0)
28             MessageBox(hwndDlg, TEXT("请输入密码！"), TEXT("信息"), MB_OK | MB_ICONINFORMATION);
29         else
30             MessageBox(hwndDlg, TEXT("该账户尚未注册，请先注册"), TEXT("信息"), MB_OK | MB_ICONINFORMATION);
31     }//if
32     else{                                                                        //关闭登陆界面，弹出主界面
33         EndDialog(hwndDlg, TRUE);
34         if (ReadAccountOrder(hwndDlg, passenger))                                //读取用户订单
35             DialogBox(hInst, MAKEINTRESOURCE(IDD_MAINDLG), NULL, (DLGPROC)MainDlgProc);
36     }//else
37 
38     return TRUE;
39 }//AccountLogIn(HWND)

 1 //用户注册
 2 BOOL AccountRegister(HWND hwndDlg){
 3 
 4     GetDlgItemText(hwndDlg, IDC_IDEDIT, passenger->IdNum, 256);            //获取用户输入ID
 5     GetDlgItemText(hwndDlg, IDC_PSWEDIT, passenger->PassWord, 256);        //获取用户输入密码
 6 
 7     if (lstrlen(passenger->PassWord) == 0){
 8         MessageBox(hwndDlg, TEXT("请输入注册用户密码！"), TEXT("信息"), MB_OK | MB_ICONINFORMATION);
 9         return FALSE;
10     }
11 
12     DialogBox(hInst, MAKEINTRESOURCE(IDD_NAMEDLG), NULL, (DLGPROC)NameDlgProc);    //获取新注册用户姓名
13 
14     if (lstrlen(passenger->Name) == 0)
15         return FALSE;
16 
17     passenger->Next = NULL;
18 
19     if (psglink.head == NULL)                                        //该注册账户为第一个账户时，头、尾结点均指向passenger
20         psglink.head = passenger;
21     else
22         psglink.tail->Next = passenger;                                //将新注册账户资料添加至账户链表
23     psglink.tail = passenger;                                        //链表尾指针指向链表尾
24     psglink.PsgNum++;                                                //注册用户数目加1
25     passenger->TicketNum = 0;                            
26     passenger->OrderLink.head = NULL;                                //乘客订单链表初始化
27     passenger->OrderLink.tail = NULL;
28     passenger->OrderLink.OrderNum = 0;
29 
30     MessageBox(hwndDlg, TEXT("注册成功！请单击确定进入主界面"), TEXT("注册成功"), MB_OK | MB_ICONINFORMATION);
31     
32     EndDialog(hwndDlg, TRUE);                                                    //关闭登陆界面
33 
34     DialogBox(hInst, MAKEINTRESOURCE(IDD_MAINDLG), NULL, (DLGPROC)MainDlgProc); //弹出主界面
35 
36     return TRUE;
37 }//AccountRegister(HWND)

点击查找、订票、退票、航班录入、修改航班信息按钮都会调用相应的函数。下面来看实现各个功能的代码：

 1 //查找航班
 2 BOOL SearchFlight(HWND hMainDlg){
 3     int flag1 = 0;                                                    //if(flag1==0) 出发地、目的地查询航班，else：航班号查航班
 4     int flag2 = 0;
 5     Flight *p;
 6     TCHAR szBuffer[256] = {TEXT("")};
 7     TCHAR szDeparture[16], szDestination[16], szFltNum[16], szDate[16];
 8 
 9     HWND hEdit = GetDlgItem(hMainDlg, IDC_INFORMATION);
10 
11     GetDlgItemText(hMainDlg, IDC_DEPARTURE, szDeparture, 15);        //获取用户输入出发地
12     GetDlgItemText(hMainDlg, IDC_DESTINATION, szDestination, 15);    //获取用户输入目的地
13     GetDlgItemText(hMainDlg, IDC_FLIGHTNUM, szFltNum, 15);            //获取用户输入航班号
14     GetDlgItemText(hMainDlg, IDC_DATE, szDate, 15);                    //获取用户选择航班时间
15 
16     SetDlgItemText(hMainDlg, IDC_INFORMATION, szBuffer);            //清空航班信息区域文本
17     
18 
19     if (lstrlen(szFltNum) || (!(lstrlen(szDeparture)) && !(lstrlen(szDestination))))
20         flag1++;
21     else if (!(lstrlen(szDeparture))){
22         MessageBox(hMainDlg, TEXT("请输入出发地！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
23         return FALSE;
24     }
25     else if (!(lstrlen(szDestination))){
26         MessageBox(hMainDlg, TEXT("请输入目的地！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
27         return FALSE;
28     }
29     if (flag1 && !(lstrlen(szFltNum))){
30         MessageBox(hMainDlg, TEXT("请输入出发地、目的地或航班号以查询航班！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
31         return FALSE;
32     }
33 
34     p = flightlink.head;
35     while (p){                                            //查找航班并输出
36         if (flag1){                                        //按航班号查找
37             if (!lstrcmp(p->Flight_Number, szFltNum) && !lstrcmp(p->Date,szDate)){//查找到符合航班，输出
38                 if (!flag2){                            //若该航班为第一班符合条件的航班
39                     _stprintf(szBuffer, TEXT("航班号	出发地	目的地	起飞时间	降落时间	余座	价格	折扣	出发日期
"));
40                     SendMessage(hEdit, EM_SETSEL, LOWORD(-1), HIWORD(-1));
41                     SendMessage(hEdit, EM_REPLACESEL, 0, (LPARAM)(szBuffer));
42                 }//if
43                 flag2++;
44                 PrintFlight(hMainDlg, p);                //输出航班信息
45             }//if
46         }//if
47         else{                                            //按出发地、目的地查找
48             if (!lstrcmp(p->Departure, szDeparture) && !lstrcmp(p->Destination, szDestination) && !lstrcmp(p->Date, szDate)){//查找到符合航班，输出
49                 if (!flag2){                            //若该航班为第一班符合条件的航班
50                     _stprintf(szBuffer, TEXT("航班号	出发地	目的地	起飞时间	降落时间	余座	价格	折扣	出发日期
"));
51                     SendMessage(hEdit, EM_SETSEL, LOWORD(-1), HIWORD(-1));
52                     SendMessage(hEdit, EM_REPLACESEL, 0, (LPARAM)(szBuffer));
53                 }//if
54                 flag2++;
55                 PrintFlight(hMainDlg, p);                //输出航班信息
56             }//if
57         }//else
58         p = p->Next;
59     }//while
60     if (!flag2)
61         MessageBox(hMainDlg, TEXT("对不起，没有符合您要求的航班"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
62     return TRUE;
63 }//SearchFlight()

 1 //将所查航班信息输出
 2 BOOL PrintFlight(HWND hwndDlg,Flight *p){
 3     TCHAR szBuffer[256];
 4     HWND hEdit = GetDlgItem(hwndDlg, IDC_INFORMATION);
 5 
 6     _stprintf(szBuffer, TEXT("
%s	%s	%s	%s	%s	%d	%.2lf	%s	%s

"),
 7         p->Flight_Number,                //航班号
 8         p->Departure,                    //出发地
 9         p->Destination,                    //目的地
10         p->TakeOff_Time,                //起飞时间
11         p->Landing_Time,                //降落时间
12         p->Vacant_Seat,                    //余座
13         p->Fare,                        //价格
14         p->Discount,                    //折扣
15         p->Date);                        //出发日期
16                                         
17     SendMessage(hEdit, EM_SETSEL, LOWORD(-1), HIWORD(-1));
18     SendMessage(hEdit, EM_REPLACESEL, 0, (LPARAM)(szBuffer));    
19 
20     return TRUE;
21 }

 1 //订票
 2 BOOL BookTickets(HWND hMainDlg){
 3     int tickets_num;
 4     Flight *p;
 5     TCHAR szFltNum[16], szDate[16];
 6 
 7     GetDlgItemText(hMainDlg, IDC_FLIGHTNUM, szFltNum, 15);            //获取用户输入航班号
 8     GetDlgItemText(hMainDlg, IDC_DATE, szDate, 15);                    //获取用户选择航班时间
 9 
10     if (!lstrlen(szFltNum)){
11         MessageBox(hMainDlg, TEXT("请输入航班号以订票！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
12         return FALSE;
13     }
14 
15     DialogBox(hInst, MAKEINTRESOURCE(IDD_FLTNUM), NULL, (DLGPROC)FlightNumDlgProc);    //获取订票数目
16 
17     if (!lstrlen(szBuffer))
18         return FALSE;
19 
20     tickets_num = _ttoi(szBuffer);                                    //订票数目
21 
22     p = flightlink.head;
23     while (p){                                                        //查找航班并订票
24         if (!lstrcmp(p->Flight_Number, szFltNum) && !lstrcmp(p->Date, szDate))        //查找到符合航班
25             _Book_Tickets(hMainDlg,p,tickets_num);
26         p = p->Next;
27     }//while
28     return TRUE;
29 }//BookTickets()     
30 
31 
32 //订票
33 BOOL _Book_Tickets(HWND hwndDlg,Flight *p,int Tickets_Num){
34     OrderForm *new_order = (OrderForm *)malloc(sizeof(OrderForm));
35     if (!new_order){
36         MessageBox(hwndDlg, TEXT("内存申请错误!"), TEXT("错误"), MB_OK | MB_ICONERROR);
37         return FALSE;
38     }
39 
40     if (Tickets_Num > p->Vacant_Seat){                    //余票不足，给出建议航班
41         Recommend(hwndDlg,p,Tickets_Num);
42         return FALSE;
43     }
44 
45     new_order->Order_Number = ++allorder.AllOrderNum;    //新订单信息，总订单数+1
46     new_order->Tickets_Num = Tickets_Num;
47     lstrcpy(new_order->IdNum, passenger->IdNum);
48     lstrcpy(new_order->Flight_Number, p->Flight_Number);
49     lstrcpy(new_order->Departure, p->Departure);
50     lstrcpy(new_order->Destination, p->Destination);
51     lstrcpy(new_order->Date, p->Date);
52     lstrcpy(new_order->TakeOff_Time, p->TakeOff_Time);
53     lstrcpy(new_order->Landing_Time, p->Landing_Time);
54     new_order->Next = NULL;
55     new_order->psgNext = NULL;
56 
57     if (allorder.head == NULL)                            //将结点添至订单链表末尾
58         allorder.head = new_order;
59     else
60         allorder.tail->Next = new_order;
61     allorder.tail = new_order;
62 
63     if (passenger->OrderLink.head == NULL)                //将结点添至用户订单链表末尾
64         passenger->OrderLink.head = new_order;
65     else
66         passenger->OrderLink.tail->psgNext = new_order;
67     passenger->OrderLink.tail = new_order;
68     passenger->OrderLink.OrderNum++;
69     passenger->TicketNum += Tickets_Num;
70 
71     p->Vacant_Seat -= Tickets_Num;                        //航班余票-1
72 
73     MessageBox(hwndDlg, TEXT("订票成功！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
74 
75     return TRUE;
76 }//_Book_Tickets()

 1 //给出建议航班
 2 BOOL Recommend(HWND hwndDlg, Flight *p,int Tickets_Num){
 3     SetDlgItemText(hwndDlg, IDC_INFORMATION, TEXT(""));    //清空航班信息栏
 4 
 5     int flag = 0;
 6     TCHAR szBuffer[256] = {TEXT("")};
 7     HWND hEdit = GetDlgItem(hwndDlg, IDC_INFORMATION);
 8     Flight *q;
 9 
10     q = flightlink.head;
11     while (q){
12         if (!(lstrcmp(p->Departure, q->Departure)) && 
13             !(lstrcmp(p->Destination, q->Destination)) && 
14             lstrcmp(p->Flight_Number, q->Flight_Number) && 
15             Tickets_Num<=q->Vacant_Seat)
16         {
17             if (!flag){
18                 wsprintf(szBuffer, TEXT("您所订航班余票不足，以下为建议航班:
"));
19                 SendMessage(hEdit, EM_SETSEL, LOWORD(-1), HIWORD(-1));
20                 SendMessage(hEdit, EM_REPLACESEL, 0, (LPARAM)(szBuffer));
21                 wsprintf(szBuffer, TEXT("
"));
22                 SendMessage(hEdit, EM_SETSEL, LOWORD(-1), HIWORD(-1));
23                 SendMessage(hEdit, EM_REPLACESEL, 0, (LPARAM)(szBuffer));
24                 wsprintf(szBuffer, TEXT("航班号	出发地	目的地	起飞时间	降落时间	余座	价格	折扣	出发日期
"));
25                 SendMessage(hEdit, EM_SETSEL, LOWORD(-1), HIWORD(-1));
26                 SendMessage(hEdit, EM_REPLACESEL, 0, (LPARAM)(szBuffer));
27                 ++flag;
28             }//if
29             PrintFlight(hwndDlg, q);
30         }//if
31         q = q->Next;
32     }//while
33 
34     if (!flag){
35         wsprintf(szBuffer, TEXT("对不起，您所订航班余票不足，当天也其它没有符合条件的航班...
"));
36         SendMessage(hEdit, EM_SETSEL, LOWORD(-1), HIWORD(-1));
37         SendMessage(hEdit, EM_REPLACESEL, 0, (LPARAM)(szBuffer));
38     }
39     return TRUE;
40 }//Recommend()

  1 //退票
  2 BOOL ReturnTickets(HWND hwndDlg){
  3     int flag = 0;
  4     int num=0,tickets_num;
  5     Flight *flight;
  6     OrderForm *p,*q,*s,*prePoint;
  7     TCHAR szFltNum[16], szDate[16];
  8 
  9     GetDlgItemText(hwndDlg, IDC_FLIGHTNUM, szFltNum, 15);        //获取用户输入航班号
 10     GetDlgItemText(hwndDlg, IDC_DATE, szDate, 15);                //获取用户选择航班时间
 11 
 12     if (!lstrlen(szFltNum)){                                    //未输入航班号
 13         MessageBox(hwndDlg, TEXT("请输入航班号！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
 14         return FALSE;
 15     }
 16 
 17     DialogBox(hInst, MAKEINTRESOURCE(IDD_FLTNUM), NULL, (DLGPROC)FlightNumDlgProc);    //获取退票数目
 18 
 19     if (!lstrlen(szBuffer))
 20         return FALSE;
 21 
 22     tickets_num = _ttoi(szBuffer);                                //退票数
 23         
 24     p = passenger->OrderLink.head;
 25     prePoint = p;
 26     if (!p){                                                    //用户无订单
 27         MessageBox(hwndDlg, TEXT("当前用户没有已订票"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
 28         return FALSE;
 29     }
 30     
 31     while (p){                                                    //退票航班订票总数
 32         if (!lstrcmp(p->Flight_Number, szFltNum) && !lstrcmp(p->Date, szDate))
 33             num += p->Tickets_Num;
 34         p = p->psgNext;
 35     }
 36     if (tickets_num > num){                                        //退票数大于该航班已订票数
 37         wsprintf(szBuffer, TEXT("对不起，该航班您只订了%d张机票，请重新填写退票张数"), num);
 38         MessageBox(hwndDlg, szBuffer, TEXT("提示"), MB_OK | MB_ICONINFORMATION);
 39         return FALSE;
 40     }//if
 41 
 42     p = passenger->OrderLink.head;
 43     while (p){                                                    //退票
 44         if (!lstrcmp(p->Flight_Number, szFltNum) && !lstrcmp(p->Date, szDate) ){
 45             if (tickets_num >= p->Tickets_Num){                    //当退票数大于等于当前订单内票数
 46 
 47                 s = p->psgNext;
 48                 passenger->TicketNum -= p->Tickets_Num;            //用户订票数减少
 49                 allorder.AllOrderNum--;                            //总订单数减少
 50                 passenger->OrderLink.OrderNum--;                //用户订单数减少
 51                 tickets_num -= p->Tickets_Num;                    //需要退票数减少  若需要退票数为0，则退出，否则继续循环
 52 
 53                 if (passenger->OrderLink.head == p){            //若p为头结点，删除头结点
 54                     passenger->OrderLink.head = p->psgNext;        //头指针指向下一个结点
 55                     if (!p->psgNext)                            //若p同时为尾结点，则尾指针指向NULL
 56                         passenger->OrderLink.tail = NULL;
 57                 }
 58                 else if (!p->psgNext)                            //若p非头结点但为尾结点，尾指针指向前一个结点
 59                     passenger->OrderLink.tail = prePoint;
 60                 prePoint->psgNext = p->psgNext;                    //链表删除结点p
 61 
 62                 flight = flightlink.head;
 63                 while (flight){                                    //航班余座增加
 64                     if (!lstrcmp(flight->Flight_Number, szFltNum) && !lstrcmp(flight->Date, szDate)){
 65                         flight->Vacant_Seat += p->Tickets_Num;
 66                         break;
 67                     }
 68                     flight = flight->Next;
 69                 }//while
 70 
 71                 q = allorder.head;
 72                 prePoint = q;
 73                 while (q){                                        //删除订单链表中订单结点
 74                     if (q == p){                                //找到订单结点
 75                         if (allorder.head == p){                //若p为头结点，删除头结点
 76                             allorder.head = p->Next;            //头指针指向下一个结点
 77                             if (!q->Next)                        //若q同时为尾结点，则尾指针指向NULL
 78                                 allorder.tail = NULL;
 79                         }
 80                         else if (!q->Next)                        //若q非头结点但为尾结点，尾指针指向前一个结点
 81                             allorder.tail = prePoint;
 82                         prePoint->Next = q->Next;                //链表删除结点q     
 83                         free(p); break;                            //释放p结点内存
 84                     }//if
 85                     prePoint = q;
 86                     q = q->Next;
 87                 }//while
 88 
 89                 if (tickets_num){                                //若退票数非0，则继续退票
 90                     p = s; continue;
 91                 }
 92                     
 93                 MessageBox(hwndDlg, TEXT("退票成功！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
 94                 return TRUE;
 95             }//if
 96             else{                                                //退票数小于该订单订票数
 97                 p->Tickets_Num -= tickets_num;                    //订单订票数减少
 98                 passenger->TicketNum -= tickets_num;            //用户订票数减少
 99 
100                 flight = flightlink.head;
101                 while (flight){                                    
102                     if (!lstrcmp(flight->Flight_Number, szFltNum) && !lstrcmp(flight->Date, szDate)){
103                         flight->Vacant_Seat += tickets_num;        //航班余票增加
104                         break;
105                     }
106                     flight = flight->Next;
107                 }//while
108 
109                 MessageBox(hwndDlg, TEXT("退票成功！"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);
110                 return TRUE;                                    //退票成功
111             }//else
112         }//if
113         prePoint = p;
114         p = p->psgNext;
115     }//while
116 
117     wsprintf(szBuffer, TEXT("对不起，您没有订该航班机票，请确认退票航班"));
118     MessageBox(hwndDlg, szBuffer, TEXT("提示"), MB_OK | MB_ICONINFORMATION);
119     return FALSE;
120 }//ReturnTickets()

这篇文章就先到这里吧，其余功能的实现以及头文件、资源文件的代码在下篇文章中给出。

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原文地址：https://www.cnblogs.com/z941030/p/4495789.html

windows API 开发飞机订票系统 图形化界面 (三)

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