C / C++ / MFC

Linking a non-MFC lib to an MFC project

19-Aug-02 21:50

Add new document template with CForm2 in CYourApp::InitInstance. Store the pointer and use it in click handler.

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

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.

Navin19-Aug-02 6:00

Navin

19-Aug-02 6:00

I have some C++ code that uses STL, some Windows APIs, but not MFC. This code is in several files and compiles into a static libary.

I am trying to link the .lib file with an MFC (static-likned) console app project. When I compile and link, I get many multiply-defined symbol errors (they are appended below.)

I know this can be done, but I'm missing something.. any ideas? Confused | :confused:

Linking...
LIBCD.lib(crt0dat.obj) : error LNK2005: __cinit already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: _exit already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __exit already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __cexit already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __c_exit already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __C_Exit_Done already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __C_Termination_Done already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __exitflag already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __wpgmptr already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __pgmptr already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: ___winitenv already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __wenviron already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: ___initenv already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __environ already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: ___wargv already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: ___argv already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: ___argc already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __winminor already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __winmajor already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __winver already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __osver already defined in libcmtd.lib(crt0dat.obj)
LIBCD.lib(crt0dat.obj) : error LNK2005: __umaskval already defined in libcmtd.lib(crt0dat.obj)
LINK : warning LNK4098: defaultlib "LIBCD" conflicts with use of other libs; use /NODEFAULTLIB:library
Debug/Harness.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

You are special and unique, just like everyone else.

Re: Linking a non-MFC lib to an MFC project

Tomasz Sowinski19-Aug-02 6:05

Re: Linking a non-MFC lib to an MFC project

19-Aug-02 6:05

Part of your project uses single-threaded static library, while other part uses multi-threaded version. Can you set harness.exe to use the same setting as your .lib file?

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

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.

Navin19-Aug-02 6:56

Navin

19-Aug-02 6:56

Hot dog! That was all it was. You are a genius. (Or you've seen this kind of breakage before and know how to recognise it instantly. Big Grin | :-D

)

Thanks.

You are special and unique, just like everyone else.

What is the Definative Book on C++.

Raskolnikov19-Aug-02 5:45

Raskolnikov

19-Aug-02 5:45

My favorite C++ Reference is "C++ The Complete Reference 3rd Ed." by Herbert Schidlt. I like his writing style and found the book easy to learn from, but I keep hearing that the book is filled with minor technical inacurracies. It would be nice to have a second more acurate (even if less readable) reference.

So my question is what book should I read if I want a 100% acurate and 100% complete coverage of C++. I though about purchasing the ANSI standard, but they are selling it for $175 which is too expensive for me to buy.

Also is the currest standard 14882 the only standard or are their earlier versions. In otherword if a book claims to cover ANSI C++ could it be covering an obsolete version?

Or maybe I could just find a web page devoted to the mistakes in Srhildt's coverage?

Tomasz Sowinski19-Aug-02 5:53

19-Aug-02 5:53

Are you asking about reference books? Or anything C++ related which is worth buying?

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

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.

valikac19-Aug-02 6:27

valikac

19-Aug-02 6:27

The definative overall book on C++ is C++ How to Program (3rd Edition) by Harvey M. Deitel, Paul J. Deitel.

The definative reference book on C++ is The C++ Programming Language (Special 3rd Edition) by Bjarne Stroustrup.

Kuphryn

Trollslayer19-Aug-02 6:43

Trollslayer

19-Aug-02 6:43

Stroustrup is great if you want to get esoteric, but for 'everyday' C++ it is over the top !
I have Schildt, and had seen Deitel & Dietel. It looks good.

Elaine (fluffy tigress with reading glasses on emoticon)

Would you like to meet my teddy bear ?

Tomasz Sowinski19-Aug-02 6:45

19-Aug-02 6:45

Trollslayer wrote:
Stroustrup is great if you want to get esoteric, but for 'everyday' C++ it is over the top !

Oops? What makes Stroustrup book 'esoteric'?

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

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.

Raskolnikov19-Aug-02 11:54

Raskolnikov

19-Aug-02 11:54

Figures his work would be accurate since he created the language.

Stuart Dootson19-Aug-02 8:33

Stuart Dootson

19-Aug-02 8:33

Hmmm - I bought the C++ standard for $18 on the ANSI website - which isn't too expensive...

I wouldn't, however, say it's the best reference to have. It's got all the goodies in it (must have if it defines the language Big Grin | :-D

), but digging out exactly what you want is tricky. Personally, I struggle on with Stroustup edition 3, Josuttis (The C++ Standard Library: A Tutorial and Reference) for Standard Library stuff and a smattering of Sutter (Exceptional C++ & More Exceptional C++) and Meyers(mainly Effective STL).

Stuart Dootson

'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p'

MFC Assertion Failures

gm_coll19-Aug-02 5:34

19-Aug-02 5:34

Hi,

I'm trying to get my application to run but it keeps on getting run-time assertion failures. I've worked out that the offending code is in DoDataExchange where I check variables (doubles) retrieved from dialog edit boxes and change them to CStrings and format them depending on their size.
The assertions which fail in the MFC source are:

ASSERT (PWnd==NULL||pWnd->m_hWnd==hWnd);

in wincore.cpp and:

ASSERT (PLinkTop!=NULL);

in except.cpp.

Unfortunately, I have no idea what these lines mean. Any ideas what the problem is?

Thanks in advance,

Graham

Tomasz Sowinski19-Aug-02 5:36

19-Aug-02 5:36

Something is very wrong with your app. Are you calling UpdateData before DoModal?

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

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.

gm_coll19-Aug-02 6:07

19-Aug-02 6:07

Don't think so. I have a main dialog box/class which creates the other (sub)dialog boxes and calls DoModal on them depending on the user's selection from a Combo Box.

By commenting out certain parts of my code I've established that the problem definitely lies in the DoDataExchange method. I'm just not sure where.

Tomasz Sowinski19-Aug-02 6:14

19-Aug-02 6:14

When you'll get the assert, just check the call stack. You'll be able to pinpoint the error.

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

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.

Mustafa Demirhan19-Aug-02 13:33

Mustafa Demirhan

19-Aug-02 13:33

It is most probably because you use DDX for a control that does not exist anymore. For example, if you used Class Wizard to create variables for your controls on a dialog, and then changed the ID of the control (or deleted the control but not the variable for the control); you will surely get this kind of assertion failures.

Mustafa Demirhan
http://www.macroangel.com
Sonork ID 100.9935:zoltrix

<nobr>They say I'm lazy but it takes all my time

gm_coll19-Aug-02 23:51

19-Aug-02 23:51

No, none of my controls are deleted or the IDs changed. I do however use the variable (double) for the edit box to Format 2 different CStrings in my code. So the first Format is

CString grstr;
grstr.Format(_T("%.20f"), m_nGrams);

in order to be able to deal with very small numbers. I then manipulate the CString in order to determine how many decimal places are required and then use:

CString grtemp;
grtemp.Format(_T("%%.%df"), signif); // signif is number of decimal places
grtemp.Format(grtemp, m_nGrams);

Would using the m_nGrams variable twice to format these two different CStrings cause my problem?

Thanks,

Graham

gm_coll20-Aug-02 4:56

20-Aug-02 4:56

I have discovered the problem in my code. It was in the lines:

CString grtemp;
grtemp.Format(_T("%%.%df"), signif); // signif is number of decimal places
grtemp.Format(grtemp, m_nGrams);

For some reason, although the application ran fine on the desktop emulator, it threw assertion failures when run on the mobile device (Jornada 720 running HPC 2000).

This may be because the emulator was for H/PC Pro 2.11 ( as there is no emulator for HPC 2000 in the eMbedded Visual C++ IDE).

Anyway I changed the above lines to:

CString grtemp;
grtemp.Format(_T("%.*f"),signif, m_nGrams);

and it now runs perfectly.

Thanks for your help,

Graham

Stop calling that dialog!

Mustafa Demirhan20-Aug-02 9:03

Mustafa Demirhan

20-Aug-02 9:03

gm_coll wrote:
Thanks for your help,

No problem, though you find it on your own Roll eyes | :rolleyes:

Mustafa Demirhan
http://www.macroangel.com
Sonork ID 100.9935:zoltrix

<nobr>They say I'm lazy but it takes all my time

jimNLX19-Aug-02 5:31

jimNLX

19-Aug-02 5:31

I have a call that is to popup a dialog window but that dialog window doesn't popup until after another one that is popped up is cancelled. The extra or other dialog is one that I use in a setfocus operation in the new dialog. I have tried setting the focus to another control using the following in initdialog:

CEdit* pNextField = (CEdit*)GetDlgItem(IDC_MF_DEADSPACE);
pNextField->SetFocus();

But this other window always comes up.

What am I doing wrong? How can I just have the dialog popup without it doing anything else?

Thanks!!!!!!!!

Re: Stop calling that dialog!

Tomasz Sowinski19-Aug-02 5:35

Re: Stop calling that dialog!

19-Aug-02 5:35

Are you returning FALSE from OnInitDialog?

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

"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.

jimNLX19-Aug-02 11:51

jimNLX

19-Aug-02 11:51

I was returning TRUE changed it to false and now it seems to work. WHY!?

Re: Stop calling that dialog!

Tomasz Sowinski19-Aug-02 21:47