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if (!qApp) {
    int argc = 0;
    new QApplication(argc, 0);
}

QCoreApplication::processEvents

QTimer::singleShot

void TThread::run()
{
    pApp->exec();
}
void TThread::stop()
{
    pApp->quit();
}

TTestCommand::TTestCommand()
    :TTest()
{
    int argc=1;
    char *argv[1];
    argv[0]="templatedll.dll";
    pApp = new QApplication(argc, argv);

    thread = new TThread();
    thread->start();

    // for c/p : templatedll.dll
    wnd = new CommandWindow();
    wnd->show();
    //wnd->setVisible(false);
}
TTestCommand::~TTestCommand()
{
    thread->stop();
    thread->wait();
    delete pApp;
}

void* TTestCommand::GetHWND()

{
    return wnd->winId();
}

TTest* __declspec(dllexport) CreateObject()
{
    return new TTestCommand();
}

typedef TTest* (*TCreateObject)();

HINSTANCE hUiiDrv_ID;
TCreateObject CreateObject;

    try{
        hUiiDrv_ID = LoadLibrary( Edit1->Text.c_str() );
    }
    catch(...)
    {
        return;
    }

    if( (CreateObject  = (TCreateObject) GetProcAddress(hUiiDrv_ID, "CreateObject"))==NULL )  return;
    TTest* tst = CreateObject();
    hwnd = tst->GetHWND();
    ::SetParent(hwnd, (HWND)(Panel1->Handle));

#include <QWinWidget>

class SignalsWindow : public QWinWidget
{
    Q_OBJECT

public:
    explicit SignalsWindow(HWND parent = 0);
    ~SignalsWindow();


private:
    Ui::SignalsWindow *ui;
};

bool Init(HINSTANCE hInstance)
{
    // Под Windows устанавливаем кодировку cp1251
#ifdef Q_WS_WIN
    QTextCodec::setCodecForTr(QTextCodec::codecForName("Windows-1251"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("Windows-1251"));
    // Под остальными ОС - utf8
#else
    QTextCodec::setCodecForTr(QTextCodec::codecForName("utf-8"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("utf-8"));
#endif

    ownApplication = QMfcApp::pluginInstance( hInstance );
    return TRUE;
}
//---------------------------------------------------------
bool Close()
{
    if(ownApplication)
        delete qApp;
    delete TestSignals;
    return TRUE;
}
//---------------------------------------------------------
HWND __declspec(dllexport) CreateObject(HWND hParent)
{
    TestWnd = new SignalsWindow(hParent)
    TestWnd->setWindowState(Qt::WindowMaximized);
    TestWnd->show();
    return TestWnd->winId();
}