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QtWS25 Last Chance
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    @Chris-Kawa wow, so simple :) and so fast answer!! woooow Thank you very much! Its works! void MainWindow::onStatusChanged(PVOID p) { qDebug() << "void *p address" << p; SERVICE_NOTIFY_2A* temp_pNotifyBuffer = static_cast<SERVICE_NOTIFY_2A*>(p); //MainWindow* ptr_mainWindow = static_cast<MainWindow*>(p); //qDebug() << ptr_mainWindow->m_test_string; qDebug() << temp_pNotifyBuffer->pContext; qDebug() << static_cast<MainWindow*>(temp_pNotifyBuffer->pContext)->m_test_string; } Service man opened pcontext address 0x8ff6a0 void *p address 0x8ff6bc 0x8ff6a0 "look it" I was misled that in Visual studio the example with "direct" transformation worked. And I went the wrong way ..