QT - Pointer to global memory

Question

First: sorry for my English from Google

The question:
I'm changing the IDE, I'm migrating from Borland to QT with QT Creator.

In Borland I used a class contained in a type library (APuma.dll). The prototype was:

BOOL XOpen (long hDIB, LPCTSTR FileName) / / OpenOCR - Cuneiform

hDIB is a pointer to global memory of an image.
This version Not Work with files.

To pass a pointer to global memory of an image, I used GDI+, but in QT can not find anything similar, and the inclusion of Gdiplus.h and GdiPlusInit.h generates too many errors.

How do I give access to global memory where I host the image to XOpen?

Thank you very much.

Answer 1

OK, I think i understand what you need. You need a pointer to the pixels of the image so you can pass it. Your simplest option in Qt is using a QImage object and using its bits() member.

Something like this:

QImage image(filename);
uchar* p = image.bits();
XOpen(reinterpret_cast<long>(p), whatever);

just be sure that XOpen somehow knows the dimmensions of the image. And that you have it in the right format (See QImage::convertToFormat ). For more overall information check the Qt documentation at http://doc.qt.io/qt-4.8/qimage.html