[win32] - SetTimer(): why the windows lost focus stops the timer?

What version of Windows is this? It sounds like when the window is out of focus, it is put in a hold state. There may be some Win32 settings you can use to let it continue to run in such a situation, but I am not expert enough with Win32 API's to tell you how to do that.

heres how i create the window:

oid setParent(HWND parent=GetDesktopWindow())
        {
            if (hwnd==NULL)
            {
                WNDCLASSEX FormClass;
                char classname[20]="Form";
                sprintf(classname,"%s",strCaption.c_str());
                HINSTANCE mod = (HINSTANCE)GetModuleHandle(NULL);

                FormClass.cbSize        = sizeof(WNDCLASSEX);
                FormClass.style         = CS_VREDRAW | CS_HREDRAW;
                FormClass.lpfnWndProc   = WndProcForm;
                FormClass.cbClsExtra    = 0;
                FormClass.cbWndExtra    = 0;
                FormClass.hInstance     = mod;
                FormClass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
                FormClass.hCursor       = LoadCursor(NULL, IDC_ARROW);
                FormClass.hbrBackground = (HBRUSH)((COLOR_WINDOW)+1);
                FormClass.lpszMenuName  = NULL;
                FormClass.lpszClassName = classname;
                FormClass.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

                // register the new window class
                RegisterClassEx(&FormClass);

                hwnd = CreateWindowEx(0, classname, strCaption.c_str(),WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
                                  CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, parent, NULL, mod, this);

                SetLayeredWindowAttributes(hwnd, 0, 255, LWA_ALPHA);
                if (hwnd == NULL)
                    MessageBox(NULL, "Can't create the control", "error", MB_OK);
            }
            else
            {
                SetParent(hwnd,parent);
            }

            ShowWindow(hwnd, SW_NORMAL);
            InvalidateRect(hwnd,NULL,true);
            UpdateWindow(hwnd);
            clrBackColor =GetDCBrushColor(GetDC(hwnd));
            clrTextColor = GetTextColor(GetDC(hwnd));
        }

i found the problem: is my message loop :(

WPARAM MessageLoop()
{
    MSG msgEvents;

    while(GetMessage(&msgEvents, NULL, 0, 0) > 0)
    {
        //if(IsChild(WindowMain,msgEvents.hwnd)==TRUE || WindowMain==msgEvents.hwnd)
        {
            if (!IsDialogMessage(GetForegroundWindow(), &msgEvents))
            {
               TranslateMessage(&msgEvents);
               DispatchMessage(&msgEvents);
            }
        }
    }
    return msgEvents.wParam;
}

if i uncomment that line, when the window, loses the focus, the messages aren't executed.
but the GetForegroundWindow() can give me 1 window that isn't from my application. so what you can advice me?

i did a global variable that i change what form have the focus. so i change the GetFeregroundWindow() to that form, and now works fine ;)