#include <windows.h>
#include <commctrl.h>

const char g_szClassName[] = "myWindowClass";
int trackbar_num = 0;
HWND hwndTrack;
HWND leftLabel;
HWND rightLabel;
HWND posLabel;
HINSTANCE hInst;

void updateLabel()
{
    trackbar_num = SendMessage(hwndTrack, TBM_GETPOS, 0, 0);
    wchar_t buf[4];
    wsprintfW(buf, L"%ld", trackbar_num);

    SetWindowTextW(posLabel, buf);
}
// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    HDC hDC, memDCExercising;
    PAINTSTRUCT ps;
    HBITMAP bmp;

    switch (msg)
    {
    case WM_CREATE:
        leftLabel = CreateWindowW(L"STATIC", L"0",
            WS_CHILD | WS_VISIBLE, 0, 0, 10, 30, hwnd, (HMENU)1, NULL, NULL);

        rightLabel = CreateWindowW(L"STATIC", L"255",
            WS_CHILD | WS_VISIBLE, 0, 0, 30, 30, hwnd, (HMENU)2, NULL, NULL);

        hwndTrack = CreateWindowW(L"msctls_trackbar32", L"Trackbar Control",
            WS_CHILD | WS_VISIBLE | TBS_AUTOTICKS,
            20, 20, 1000, 30, hwnd, (HMENU)"trackbar", NULL, NULL);

        posLabel = CreateWindowW(L"STATIC", L"0",
            WS_CHILD | WS_VISIBLE, 50, 50, 100, 100, hwnd, (HMENU)1, NULL, NULL);

        SendMessage(hwndTrack, TBM_SETRANGE, (WPARAM)TRUE, (LPARAM)MAKELONG(0, 255));
        SendMessage(hwndTrack, TBM_SETBUDDY, TRUE, (LPARAM)leftLabel);
        SendMessage(hwndTrack, TBM_SETBUDDY, FALSE, (LPARAM)rightLabel);
        break;
    case WM_PAINT:
        hDC = BeginPaint(hwnd, &ps);
        bmp = LoadBitmap(hInst, L"C:\\example.bmp");
        memDCExercising = CreateCompatibleDC(hDC);
        SelectObject(memDCExercising, bmp);
        BitBlt(hDC, 100, 100, 500, 500, memDCExercising, 0, 0, SRCCOPY);
        DeleteDC(memDCExercising);
        DeleteObject(bmp);
        EndPaint(hwnd, &ps);
        break;
    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;
    case WM_HSCROLL:
        updateLabel();
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    HWND hwnd;
    HWND track;
    MSG Msg;
    hInst = hInstance;

    //Step 1: Registering the Window Class
    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);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = L"ClassName";
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    if (!RegisterClassEx(&wc))
    {
        MessageBox(NULL, L"Window Registration Failed!", L"Error!",
            MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    // Step 2: Creating the Window
    hwnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,
        L"ClassName",
        L"Image Analysis",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 1100, 150,
        NULL, NULL, hInstance, NULL);

    if (hwnd == NULL)
    {
        MessageBox(NULL, L"Window Creation Failed!", L"Error!",
            MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

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

    // Step 3: The Message Loop
    while (GetMessage(&Msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;
}