Hot Key Control Example

#include <windows.h>
#include <commctrl.h>
#pragma comment(lib,"comctl32.lib")

#define IDC_HOTKEY 1001

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

int APIENTRY WinMain(HINSTANCE hInst,
                     HINSTANCE,
                     LPSTR,
                     int nCmdShow)
{
    INITCOMMONCONTROLSEX icc;
    icc.dwSize = sizeof(icc);
    icc.dwICC = ICC_WIN95_CLASSES;
    InitCommonControlsEx(&icc);

    WNDCLASS wc = {0};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInst;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
    wc.lpszClassName = TEXT("HotKeyExample");

    RegisterClass(&wc);

    HWND hwnd = CreateWindow(
        TEXT("HotKeyExample"),
        TEXT("Windows API Hot Key Control"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        400,
        180,
        NULL,
        NULL,
        hInst,
        NULL);

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    MSG msg;

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

    return (int)msg.wParam;
}

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

    switch(msg)
    {
        case WM_CREATE:

            CreateWindow(
                TEXT("STATIC"),
                TEXT("Press a shortcut:"),
                WS_CHILD | WS_VISIBLE,
                20,
                20,
                120,
                20,
                hwnd,
                NULL,
                GetModuleHandle(NULL),
                NULL);

            hHotKey = CreateWindowEx(
                0,
                HOTKEY_CLASS,
                NULL,
                WS_CHILD | WS_VISIBLE | WS_BORDER,
                20,
                45,
                200,
                25,
                hwnd,
                (HMENU)IDC_HOTKEY,
                GetModuleHandle(NULL),
                NULL);

            // Default hot key = Ctrl+Alt+F1
            SendMessage(
                hHotKey,
                HKM_SETHOTKEY,
                MAKEWORD(VK_F1, HOTKEYF_CONTROL | HOTKEYF_ALT),
                0);

            return 0;

        case WM_COMMAND:

            if (LOWORD(wParam) == IDC_HOTKEY &&
                HIWORD(wParam) == EN_CHANGE)
            {
                WORD hotkey =
                    (WORD)SendMessage(
                        hHotKey,
                        HKM_GETHOTKEY,
                        0,
                        0);

                BYTE vk = LOBYTE(hotkey);
                BYTE mods = HIBYTE(hotkey);

                TCHAR text[100];

                wsprintf(
                    text,
                    TEXT("Virtual Key = %u\nModifiers = %u"),
                    vk,
                    mods);

                MessageBox(hwnd,
                           text,
                           TEXT("Hot Key"),
                           MB_OK);
            }

            return 0;

        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
    }

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