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Код

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;
    static HDC hDC;
    static int x, y;  // позиция курсора мыши
    static BOOL bTracking = FALSE;

    switch (message)
    {
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // Разобрать выбор в меню:
        switch (wmId)
        {
        case ID_Pencil:
            switch(message)
            {
            case WM_LBUTTONDOWN: 
        bTracking = TRUE;
        // начальная позиция
        x = LOWORD(lParam);
        y = HIWORD(lParam);
        MoveToEx(hDC, x, y, NULL);
        break; 
 
        case WM_LBUTTONUP:
        if (bTracking)
            bTracking = FALSE; 
            break; 
 
        case WM_MOUSEMOVE: 
        if (bTracking) {
            // новая позиция
            x = LOWORD(lParam);
            y = HIWORD(lParam);
            LineTo(hDC, x, y);
        } 
            break;
            }

        case IDM_ABOUT:
            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
            break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO: добавьте любой код отрисовки...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}