ASSERT: "bitmap" in file image\qnativeimage.cpp, line 114

Hi all, I am facing to assertion failed issue in image\qnativeimage.cpp at line 114.

I use open source QT version 4.7.1 and QTWinMigrate 2.8_1 in standalone MFC application where I can not modify code, so I use QMfcApp.pluginInstance to attach.
I have looked into call stack and it seems like low memory issue, but I think it is not.

Problem seems to be that QNativeImage is asked to allocate bitmap of size 32768 * 32768 which is probably too much (you can see it in fallowing call stack).
Does anybody know how to avoid this issue? Or at least how can I workaround it?

Follows my call stack:
QtCored4.dll!qt_message_output(QtMsgType msgType=QtFatalMsg, const char * buf=0x10b705a8) Line 2270 C++
QtCored4.dll!qt_message(QtMsgType msgType=QtFatalMsg, const char * msg=0x672a6a80, char * ap=0x0027e764) Line 2328 + 0x12 bytes C++
QtCored4.dll!qFatal(const char * msg=0x672a6a80, ...) Line 2511 + 0xf bytes C++
QtCored4.dll!qt_assert(const char * assertion=0x11ff0314, const char * file=0x11ff02fc, int line=114) Line 2027 + 0x16 bytes C++
QtGuid4.dll!QNativeImage::QNativeImage(int width=32767, int height=32767, QImage::Format format=Format_RGB32, bool isTextBuffer=false, QWidget * __formal=0x10bc0ce0) Line 114 + 0x1b bytes C++
QtGuid4.dll!QRasterWindowSurface::prepareBuffer(QI mage::Format format=Format_RGB32, QWidget * widget=0x10bc0ce0) Line 378 + 0x34 bytes C++
> QtGuid4.dll!QRasterWindowSurface::setGeometry(cons t QRect & rect={...}) Line 325 C++
QtGuid4.dll!QWidgetBackingStore::sync() Line 1183 C++
QtGuid4.dll!QWidgetPrivate::syncBackingStore() Line 1819 C++
QtGuid4.dll!QWidget::event(QEvent * event=0x10b1a720) Line 8494 C++
QtGuid4.dll!QApplicationPrivate::notify_helper(QOb ject * receiver=0x10bc0ce0, QEvent * e=0x10b1a720) Line 4445 + 0x11 bytes C++
QtGuid4.dll!QApplication::notify(QObject * receiver=0x10bc0ce0, QEvent * e=0x10b1a720) Line 4410 + 0x10 bytes C++
QtCored4.dll!QCoreApplication::notifyInternal(QObj ect * receiver=0x10bc0ce0, QEvent * event=0x10b1a720) Line 732 + 0x15 bytes C++
QtCored4.dll!QCoreApplication::sendEvent(QObject * receiver=0x10bc0ce0, QEvent * event=0x10b1a720) Line 215 + 0x39 bytes C++
QtCored4.dll!QCoreApplicationPrivate::sendPostedEv ents(QObject * receiver=0x00000000, int event_type=0, QThreadData * data=0x0df77258) Line 1373 + 0xd bytes C++
QtCored4.dll!QCoreApplication::sendPostedEvents(QO bject * receiver=0x00000000, int event_type=-1) Line 1266 + 0x11 bytes C++
QtWinMigrate-2.8d.dll!QtFilterProc(int nCode=0, unsigned int wParam=1, long lParam=2618184) Line 105 + 0x10 bytes C++

Thanks in advance,
Dusan

That assertion seems to be because Windows is not returning a valid device context from a call to CreateCompatibleDC(). Since nothing in the stack back trace relates to your code we have no way of knowing what triggered this situation.

Hi, thanks for reply.

DC returned seems to be correct (hdc is not NULL), but CreateDIBSection returns NULL, so Q_ASSERT(bitmap) invokes this.

My QDialog is right before this assertion hidden by its non QT parent set using Win32 API function SetParent. I can not influence the way how is my widget attached. All I had to do is return HWND of my window.

QT is open source, may I try to repair this issue? I found that some more people on internet had the same issue without solutions.

What is the source of values width=32767 height=32767? For me those seems to be Maximum size, but it is too much to allocate so it fails.

Dusan