ImGui 创建窗口 ???

我本想把 ImGui 创建窗口部分交由别的语言进行创建,可创建后的效果不理想.
无论我进行怎样的按键/鼠标操作都无法使UI"动起来".不知是哪里出了问题.

// C++代码中创建窗口部分
    windowClass.cbSize = sizeof(WNDCLASSEXA);
    windowClass.style = CS_CLASSDC;
    windowClass.lpfnWndProc = WindowProcess;
    windowClass.cbClsExtra = 0;
    windowClass.cbWndExtra = 0;
    windowClass.hInstance = GetModuleHandleA(0);
    windowClass.hIcon = 0;
    windowClass.hCursor = 0;
    windowClass.hbrBackground = 0;
    windowClass.lpszMenuName = 0;
    windowClass.lpszClassName = className;
    windowClass.hIconSm = 0;

    RegisterClassExA(&windowClass);

    window = CreateWindowEx(WS_EX_TOPMOST | WS_EX_LAYERED | WS_EX_TOOLWINDOW,
        className,
        windowName,
        WS_POPUP,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        WIDTH,
        HEIGHT,
        NULL,
        NULL,
        GetModuleHandle(NULL),
        NULL);

    UpdateWindow(window);
    ShowWindow(window, SW_SHOWDEFAULT);
    SetLayeredWindowAttributes(window, 0, 255, LWA_ALPHA);

// 消息循环部分
if (ImGui_ImplWin32_WndProcHandler(window, message, wideParameter, longParameter))
        return true;

    switch (message)
    {
    case WM_SIZE: {
        if (gui::device != NULL && wideParameter != SIZE_MINIMIZED)
        {
            gui::presentParameters.BackBufferWidth = LOWORD(longParameter);
            gui::presentParameters.BackBufferHeight = HIWORD(longParameter);
            gui::ResetDevice();
        }
    }return 0;

    case WM_SYSCOMMAND: {
        if ((wideParameter & 0xfff0) == SC_KEYMENU)
            return 0;
    }break;

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

    case WM_LBUTTONDOWN: {
        gui::position = MAKEPOINTS(longParameter);
    }return 0;

    case WM_MOUSEMOVE: {
        if (wideParameter == MK_LBUTTON)
        {
            const auto points = MAKEPOINTS(longParameter);
            auto rect = ::RECT{ };

            GetWindowRect(gui::window, &rect);

            rect.left += points.x - gui::position.x;
            rect.top += points.y - gui::position.y;

            if (gui::position.x >= 0 &&
                gui::position.x <= gui::WIDTH &&
                gui::position.y >= 0 && gui::position.y <= 19)
                SetWindowPos(
                    gui::window,
                    HWND_TOPMOST,
                    rect.left,
                    rect.top,
                    0, 0,
                    SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOZORDER);
        }
    }return 0;

    }

    return DefWindowProcW(window, message, wideParameter, longParameter);