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Код

LRESULT WINAPI winproc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);

const TCHAR CLSNAME[] = TEXT("helloworldWClass");

/*****************************************************/

bool CAddInNative::CallAsProc(const long lMethodNum,
                    tVariant* paParams, const long lSizeArray)
{ 

    switch(lMethodNum)
    { 
    case eMethEnable:
        m_boolEnabled = true;
        break;
    case eMethDisable:
        m_boolEnabled = false;
        break;
    case eMethShowInStatusLine:
    {
      
        WNDCLASSEX wc = { };
        MSG msg;
        HWND hwnd;

        wc.cbSize = sizeof(wc);
        wc.style = 0;
        wc.lpfnWndProc = winproc;
        wc.cbClsExtra = 0;
        wc.cbWndExtra = 0;
        wc.hInstance = NULL;
        wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
        wc.hCursor = LoadCursor(NULL, IDC_ARROW);
        wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
        wc.lpszMenuName = NULL;
        wc.lpszClassName = CLSNAME;
        wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

        if (!RegisterClassEx(&wc)) {
            MessageBox(NULL, TEXT("Could not register window class"),
                NULL, MB_ICONERROR);
            return 0;
        }

        hwnd = CreateWindowEx(WS_EX_NOPARENTNOTIFY,
            CLSNAME,
            NULL,
            WS_OVERLAPPED,
            200, 
            200,
            500,
            100,
            NULL,
            NULL,
            NULL, 
            NULL);

        if (!hwnd) {
            MessageBox(NULL, TEXT("Could not create window"), NULL, MB_ICONERROR);
            return 0;
        }

        ShowWindow(hwnd, SW_SHOW);
        UpdateWindow(hwnd);

        while (GetMessage(&msg, NULL, 0, 0)) {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        return 0;
    }
       break;
    case eMethStartTimer:
       break;
    default:
        return false;
    }

    return true;
}

/****************************/

LRESULT CALLBACK winproc(HWND hw, UINT msg, WPARAM wp, LPARAM lp)
{
    HWND hProgBar;
    switch (msg) {
    case WM_CREATE:
      
        break;

    case WM_COMMAND:
      
        break;

    case WM_CLOSE:
    {
        DestroyWindow(hw);
        return 0;
    }
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    default:
        return DefWindowProc(hw, msg, wp, lp);
    }
    return 0;
}