C / C++ / MFC

Tomasz Sowinski9-Sep-02 2:19

9-Sep-02 2:19

Can you check m_pDocManager at the end of CYourApp::InitInstance?

Tomasz Sowinski -- http://www.shooltz.com

** Putt knot yore thrust inn spel chequers. **

Jawache9-Sep-02 2:22

9-Sep-02 2:22

Yup,

Its declared in AddDocTemplate

and its still NOT null by the end of InitInstance()

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 2:26

9-Sep-02 2:26

Jawache wrote:
and its still NOT null by the end of InitInstance()

This is how it's expected to work.

Now, the advanced breakpoint stuff. Open the breakpoints dialog box (Ctrl+B), select the 'Data' tab and type 'theApp.m_pDocManager' (without apostrophes) in the 'Enter the expression to be evaluated' box. Run the program - you should hit the bkpt in the InitInstance first (this is when it's initialized), then for the second time when it gets nullified.

Tomasz Sowinski -- http://www.shooltz.com

** Putt knot yore thrust inn spel chequers. **

Jawache9-Sep-02 2:39

9-Sep-02 2:39

Argh....

The breakpoint is called when the m_pDocManager is initiated but isn't when it goes back to NULL?? -- Hmm.. soounds like VC itself is buggered...

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 2:43

9-Sep-02 2:43

Jawache wrote:
The breakpoint is called when the m_pDocManager is initiated but isn't when it goes back to NULL

Well, it never goes back to NULL in correctly behaving app. CWinApp::~CWinApp just deletes m_pDocManager. But you're sure that at this point m_pDocManager is NULL when your app exits?

Tomasz Sowinski -- http://www.shooltz.com

** Putt knot yore thrust inn spel chequers. **

Jawache9-Sep-02 2:53

9-Sep-02 2:53

Yes,

It's definately null by the time the destructor is called, but the conditional breakpoint isn't called.

Does the advanced breakpoint work if its a memory overwrite ?

Interesting point -- I put a breakpoint in the connstructor and its actually called twice? I thought there was only ever 1 CWinApp derived object.

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 2:55

9-Sep-02 2:55

Jawache wrote:
I put a breakpoint in the connstructor and its actually called twice? I thought there was only ever 1 CWinApp derived object

Yes, there should be exactly one CWinApp-derived object. Look at the call stack when code hits the breakpoint in constructor.

Tomasz Sowinski -- http://www.shooltz.com

** Putt knot yore thrust inn spel chequers. **

Jawache9-Sep-02 3:36

9-Sep-02 3:36

The first CWinApp Derived is

CWinApp _afxOleWinApp;

the second is the normal

CExplorerApp theApp;

I think its safe at this point to mention that i'm using some activeX controls in my applications. I suppose thats what the _afxOleWinApp is all about.

The constructor is called twice becuase two objects are created, but the destructor is called once.

I think i've got it.

The descructor is called for _afxOleWinApp and since no documents have been added to this one the m_pDocManager is NULL by the time the destructor is called.

This must cause some error and the app to terminate incorrectly.

What is _afxOleWinApp is this correct behavior, to have 2 WinApps?

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 3:49

9-Sep-02 3:49

_afxOleWinApp is defined in dll-related MFC source files. The comment next to declaration states that '// This CWinApp is required so this module state has a CWinApp object!'

It seems you're somehow managed to mix dll-mode MFC into your .exe. Is _afxOleWinApp declared in dllinit.cpp or dllole.cpp?

Tomasz Sowinski -- http://www.shooltz.com

To some its a six-pack, to me it's a support group

Jawache9-Sep-02 4:08

9-Sep-02 4:08

its declared in dllole.cpp

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Tomasz Sowinski9-Sep-02 4:12

9-Sep-02 4:12

Jawache wrote:
its declared in dllole.cpp

Maybe your ActiveX controls are MFC-based?

Tomasz Sowinski -- http://www.shooltz.com

To some its a six-pack, to me it's a support group

Jawache9-Sep-02 4:33

Re: [SOLVED] Memory Leaks in IMPLEMENT_DYNCREATE?!?!?!?

9-Sep-02 4:33

I reckon they are.. i'll contact the author.

Should it matter though, I thought the whole COM ActiveX thing was entirely self contained i.e. it shouldn't matter what they are written in as long as they have the same interface.

So basically, CExplorerApp theApp; is not being destroyed. So VC is picking up memory leaks.

There must be an error after the destruction of _afxOleWinApp before theApp can be destroyed.

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Jawache10-Sep-02 12:48

10-Sep-02 12:48

Got it.

The brute force method. Make a baseline and then change code randomly untill it goes away.

Turns out it was some sort of strange recursicve pointer deletion in the Splitter Window Class.

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Jawache9-Sep-02 2:26

Saving DC contents in an image file

9-Sep-02 2:26

Is there any way to set a contitional breakpoint when m_pDocManager changes or something?

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Majid Shahabfar9-Sep-02 1:01

Majid Shahabfar

9-Sep-02 1:01

Hi dear,
I want to save the CDC class content into a bitmap file.
How can I do this?
I've done it by using GDI+ simply because this functionality exists in GDI+ library. But I don't wanna use GDI+ in my application.

Re: Saving DC contents in an image file

Jawache9-Sep-02 1:18

9-Sep-02 1:18

I hope you don't mind me asking but i was looking to implement similar functionality in my app a bit later.

Is there an article or some information you can point me to as to how to accomplish this?

Cheers

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

3D plot

Majid Shahabfar9-Sep-02 0:51

Majid Shahabfar

9-Sep-02 0:51

Hi dear,
I'm looking for a class or library for crating a 3D plot
for x,y,z series of data, programmatically.
a 3D plot, as you've seen in MATLAB software.
Thank you in advance.

Re: 3D plot

Jawache9-Sep-02 1:24