尝试创建列表框 C++ 时出现 IDC_LISTBOX_EXAMPLE 未定义错误

Question

我想创建这样简单的允许多重选择的列表框，为此，我做了以下操作：顺便说一句，我正在使用 Visual Studio 2013 Ultimate

#include <iostream>
#include "Windows.h"
#include "Strsafe.h"
#include "Afxres.h"


typedef struct 
{ 
    TCHAR achName[MAX_PATH]; 
    TCHAR achPosition[12]; 
    int nGamesPlayed; 
    int nGoalsScored; 
} Player; 

Player Roster[] = 
{ 
    {TEXT("Haas, Jonathan"), TEXT("Midfield"), 18, 4 }, 
    {TEXT("Pai, Jyothi"), TEXT("Forward"), 36, 12 }, 
    {TEXT("Hanif, Kerim"), TEXT("Back"), 26, 0 }, 
    {TEXT("Anderberg, Michael"), TEXT("Back"), 24, 2 }, 
    {TEXT("Jelitto, Jacek"), TEXT("Midfield"), 26, 3 }, 
    {TEXT("Raposo, Rui"), TEXT("Back"), 24, 3}, 
    {TEXT("Joseph, Brad"), TEXT("Forward"), 13, 3 }, 
    {TEXT("Bouchard, Thomas"), TEXT("Forward"), 28, 5 }, 
    {TEXT("Salmre, Ivo "), TEXT("Midfield"), 27, 7 }, 
    {TEXT("Camp, David"), TEXT("Midfield"), 22, 3 }, 
    {TEXT("Kohl, Franz"), TEXT("Goalkeeper"), 17, 0 }, 
}; 


INT_PTR CALLBACK ListBoxExampleProc(HWND hDlg, UINT message, 
        WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_INITDIALOG:
        {
            // Add items to list. 
            HWND hwndList = GetDlgItem(hDlg, IDC_LISTBOX_EXAMPLE);  
            for (int i = 0; i < ARRAYSIZE(Roster); i++) 
            { 
                int pos = (int)SendMessage(hwndList, LB_ADDSTRING, 0, 
                    (LPARAM) Roster[i].achName); 
                // Set the array index of the player as item data.
                // This enables us to retrieve the item from the array
                // even after the items are sorted by the list box.
                SendMessage(hwndList, LB_SETITEMDATA, pos, (LPARAM) i); 
            } 
            // Set input focus to the list box.
            SetFocus(hwndList); 
            return TRUE;               
        } 

    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case IDOK:
        case IDCANCEL:
            EndDialog(hDlg, LOWORD(wParam));
            return TRUE;

        case IDC_LISTBOX_EXAMPLE:
            {
                switch (HIWORD(wParam)) 
                { 
                case LBN_SELCHANGE:
                    {
                        HWND hwndList = GetDlgItem(hDlg, IDC_LISTBOX_EXAMPLE); 

                        // Get selected index.
                        int lbItem = (int)SendMessage(hwndList, LB_GETCURSEL, 0, 0); 

                        // Get item data.
                        int i = (int)SendMessage(hwndList, LB_GETITEMDATA, lbItem, 0);

                        // Do something with the data from Roster[i]
                        TCHAR buff[MAX_PATH];
                        StringCbPrintf (buff, ARRAYSIZE(buff),  
                            TEXT("Position: %s\nGames played: %d\nGoals: %d"), 
                            Roster[i].achPosition, Roster[i].nGamesPlayed, 
                            Roster[i].nGoalsScored);

                        SetDlgItemText(hDlg, IDC_STATISTICS, buff); 
                        return TRUE; 
                    } 
                }
            }
            return TRUE;
        }
    }
    return FALSE;
}

尽管我已经包含了我需要的所有内容，但我收到以下错误：

Error:identifer "IDC_LISTBOX_EXAMPLE" is undefined.

为什么我会收到这样的错误？有人可以帮助我吗？

编辑

我没有使用 MFC 模板，我必须使用吗？

Answer 1

好吧，所以，除了对话过程之外，你什么都没有。好的。文件 -> 新建... -> 项目： 然后确定->下一步。您需要创建基于对话框的应用程序。为此，创建空应用程序： 并单击“完成”。

现在你有一个空的项目。您需要添加对话框资源。右键单击项目 -> 添加 -> 资源。然后对话框 -> 新建： 您将看到空对话框。右键单击它们 - >属性。记住 ID 的值（在我的例子中为 IDD_DIALOG1）： 然后你需要添加列表框控件。转到工具箱窗口（视图 -> 工具箱，Ctrl+Alt+X），选择列表框并拖放到对话框中： 好的。然后您需要知道列表框的 ID（与对话框相同：右键单击列表框控件 -> 属性 -> ID）。在我的例子中是 IDC_LIST2。对于您的示例，您需要以相同的方式添加静态文本控件（与列表框相同的方式：工具箱 -> 静态文本 -> 拖放到对话框窗体）。为此静态控件提供另一个 ID（右键单击 -> 属性 -> Id -> 更改为 IDC_STATISTICS）：

这就是您需要对对话框执行的所有操作:)

现在 - 代码。将新的 cpp 文件添加到项目中：

#include <Windows.h>
#include <tchar.h>
#include <strsafe.h>
#include "resource.h"

INT_PTR CALLBACK ListBoxExampleProc(HWND hDlg, UINT message, 
        WPARAM wParam, LPARAM lParam);

int CALLBACK _tWinMain(
  _In_  HINSTANCE hInstance,
  _In_  HINSTANCE hPrevInstance,
  _In_  LPTSTR lpCmdLine,
  _In_  int nCmdShow)
{
    ::DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG1), NULL, ListBoxExampleProc);
    return 0;
}

typedef struct 
{ 
    TCHAR achName[MAX_PATH]; 
    TCHAR achPosition[12]; 
    int nGamesPlayed; 
    int nGoalsScored; 
} Player; 

Player Roster[] = 
{ 
    {TEXT("Haas, Jonathan"), TEXT("Midfield"), 18, 4 }, 
    {TEXT("Pai, Jyothi"), TEXT("Forward"), 36, 12 }, 
    {TEXT("Hanif, Kerim"), TEXT("Back"), 26, 0 }, 
    {TEXT("Anderberg, Michael"), TEXT("Back"), 24, 2 }, 
    {TEXT("Jelitto, Jacek"), TEXT("Midfield"), 26, 3 }, 
    {TEXT("Raposo, Rui"), TEXT("Back"), 24, 3}, 
    {TEXT("Joseph, Brad"), TEXT("Forward"), 13, 3 }, 
    {TEXT("Bouchard, Thomas"), TEXT("Forward"), 28, 5 }, 
    {TEXT("Salmre, Ivo "), TEXT("Midfield"), 27, 7 }, 
    {TEXT("Camp, David"), TEXT("Midfield"), 22, 3 }, 
    {TEXT("Kohl, Franz"), TEXT("Goalkeeper"), 17, 0 }, 
}; 


INT_PTR CALLBACK ListBoxExampleProc(HWND hDlg, UINT message, 
        WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_INITDIALOG:
        {
            // Add items to list. 
            HWND hwndList = GetDlgItem(hDlg, IDC_LIST2);  
            for (int i = 0; i < ARRAYSIZE(Roster); i++) 
            { 
                int pos = (int)SendMessage(hwndList, LB_ADDSTRING, 0, 
                    (LPARAM) Roster[i].achName); 
                // Set the array index of the player as item data.
                // This enables us to retrieve the item from the array
                // even after the items are sorted by the list box.
                SendMessage(hwndList, LB_SETITEMDATA, pos, (LPARAM) i); 
            } 
            // Set input focus to the list box.
            SetFocus(hwndList); 
            return TRUE;               
        } 

    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case IDOK:
        case IDCANCEL:
            EndDialog(hDlg, LOWORD(wParam));
            return TRUE;

        case IDC_LIST2:
            {
                switch (HIWORD(wParam)) 
                { 
                case LBN_SELCHANGE:
                    {
                        HWND hwndList = GetDlgItem(hDlg, IDC_LIST2); 

                        // Get selected index.
                        int lbItem = (int)SendMessage(hwndList, LB_GETCURSEL, 0, 0); 

                        // Get item data.
                        int i = (int)SendMessage(hwndList, LB_GETITEMDATA, lbItem, 0);

                        // Do something with the data from Roster[i]
                        TCHAR buff[MAX_PATH];
                        StringCbPrintf (buff, ARRAYSIZE(buff),  
                            TEXT("Position: %s\nGames played: %d\nGoals: %d"), 
                            Roster[i].achPosition, Roster[i].nGamesPlayed, 
                            Roster[i].nGoalsScored);

                        SetDlgItemText(hDlg, IDC_STATISTICS, buff); 
                        return TRUE; 
                    } 
                }
            }
            return TRUE;
        }
    }
    return FALSE;
}

编译并运行！请记住 -切勿使用 WInAPI（或 MFC，无论如何）来编写 UI。使用Qt！

以及您应用程序的屏幕：