List Box Control Example

Copy

The following messages are sent to both the listbox and staticbox as a SendMessage API function parameter.

LB_ADDSTRING- add items to the listbox
LB_GETCURSEL – get index of currently selected item in listbox
LB_GETTEXT – retrieves listbox item text
WM_SETTEXT – sets value of static box display value

#include <windows.h>

#define IDC_LIST   1
#define IDC_STATIC 2

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);


int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASSEX wc;
    MSG msg;

    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = TEXT("MyWindowClass");
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    RegisterClassEx(&wc);


    CreateWindowEx(
        WS_EX_CLIENTEDGE,
        TEXT("MyWindowClass"),
        TEXT("List Box Demo"),
        WS_VISIBLE | WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        700,
        200,
        NULL,
        NULL,
        hInstance,
        NULL);


    while (GetMessage(&msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}


LRESULT CALLBACK WndProc(HWND hwnd,
                         UINT msg,
                         WPARAM wParam,
                         LPARAM lParam)
{
    static HWND hwndList;
    static HWND hwndStatic;

    TCHAR *names[] =
    {
        TEXT("Matthew"),
        TEXT("Mark"),
        TEXT("Luke"),
        TEXT("John")
    };


    switch(msg)
    {

        case WM_CREATE:
        {
            // Create list box
            hwndList = CreateWindow(
                TEXT("LISTBOX"),
                TEXT(""),
                WS_CHILD |
                WS_VISIBLE |
                WS_BORDER |
                WS_VSCROLL |
                LBS_NOTIFY,

                10,
                10,
                150,
                80,

                hwnd,
                (HMENU)IDC_LIST,
                NULL,
                NULL);


            // Create static control
            hwndStatic = CreateWindow(
                TEXT("STATIC"),
                TEXT("Select a name"),
                WS_CHILD |
                WS_VISIBLE |
                WS_BORDER,

                10,
                100,
                150,
                25,

                hwnd,
                (HMENU)IDC_STATIC,
                NULL,
                NULL);


            // Add items to list box
            for(int i = 0; i < 4; i++)
            {
                SendMessage(
                    hwndList,
                    LB_ADDSTRING,
                    0,
                    (LPARAM)names[i]);
            }

            return 0;
        }


        case WM_COMMAND:
        {
            // List box selection changed
            if(LOWORD(wParam) == IDC_LIST &&
               HIWORD(wParam) == LBN_SELCHANGE)
            {
                TCHAR selectedText[50];


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


                // Get selected item text
                SendMessage(
                    hwndList,
                    LB_GETTEXT,
                    index,
                    (LPARAM)selectedText);


                // Display selected text
                SetWindowText(
                    hwndStatic,
                    selectedText);
            }

            return 0;
        }


        case WM_DESTROY:

            PostQuitMessage(0);
            return 0;
    }


    return DefWindowProc(hwnd, msg, wParam, lParam);
}