problem with new operator constructing GDI+ classes

[Baris Kurtlutepe]

Hi, I'm using GDI+ in my MFC based application and create GDI+ classes on the fly using the new operator as follows: Bitmap* mybitmap = new Bitmap(320,24); The above line compiles fine if I build the application in release mode, but in debug mode, compiler (VC++6.0 w. SP5, latest platform sdk) fails with: error C2660: 'new' : function does not take 3 parameters That is because of mfc's debug definitions on top of the file: #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif and DEBUG_NEW is defined in afx.h as: #define DEBUG_NEW new(THIS_FILE, __LINE__) So, what exactly is wrong with calling a constructor with parameters? Does the "debug" version new operator handle the case incorrect or am I making a terrible mistake somewhere? Any help would be appreciated. P.S: Bitmap(320,200) is the same as Bitmap(320,200,PixelFormat32bppARGB) and neither case it didn't compile.

[Lost User]

http://www.codeproject.com/vcpp/gdiplus/gdiplusspeed.asp#xx81095xx Read the thread "Can't create bitmaps with new"

[Joel Lucsy]

I found if you comment out the line #define new DEBUG_NEW it will work just fine. You just won't have any indications that you're leaking memory. Joel Lucsy

[Baris Kurtlutepe]

Thanks for the comments, though I know that it works without defining DEBUG_NEW or with using the new operator from globalnamespace (i.e. ::new) as described in Benjamin's comment, but does anyone have any idea why it doesn't work with GDI+ classes? I mean there must be some error somewhere, since the debug_new operator seems to work fine with classes who take parameters in their constructors but not with GDI+. For example I have created a class with class CTest { public: CTest(); CTest(int x); virtual ~CTest(); }; and it works fine by CTest* test = new CTest(3); and further testing.. tadaa I found the error! :) if your class lacks a constructor without parameters (so do the GDI+ classes), as in: class CTest { public: CTest(int x); virtual ~CTest(); }; the debug new operator fails on the following line: CTest* test = new CTest(3); Must be a bug or a lazy implementation. edit: That wasn't true, I retested it and debug_new works with the CTest class in both cases. I'm pretty confused by now.. :confused: