C / C++ / MFC

8-Feb-09 8:06

Add a handler to WM_GETMINMAXINFO and set the ptMinTrackSize and ptMaxTrackSize members of the MINMAXINFO structure to your desired size.

I think that's what I've used in the past, anyway.

assertion faliure

Parinay Bansal8-Feb-09 0:16

8-Feb-09 0:16

I am creating an application which will read data from a smart card and send it across to a server on the network

it is an MFC dialog based application

i am a starter with VC++

whenever i compile my application it shows me error:

Assertion failure in afxwin1.inl at line 27
the code at line 27 is:
{ ASSERT(afxCurrentAppName != NULL); return afxCurrentAppName; }
if i ignore it my application runs fine
but this error is not fine.
i am using VC++ 6.0

it comes if i add
SCard SCManager;
to be a global variable in my app

SCard definition is:
class SCard : public CWnd
{
public:
SCard();
public:
LONG GetDataString(CString &DataStream, DWORD &dwRecvLength);
CString GetErrorMessage(LONG lReturn);
LONG m_SCardConnect();
void m_SCardSelectReader();
LONG m_SCardReleaseConext();
LONG m_SCardEstablishContext();
CString m_SCardListReaders();

CString m_SelectedReader; // the selected reader
SCARDHANDLE m_hCardHandle; // handle to the card
SCARDCONTEXT m_hSC; //context handle to the card
virtual ~SCard();
protected:
CString m_csReaderList; //list of available readers.
DECLARE_MESSAGE_MAP()
};

please help me

Stuart Dootson8-Feb-09 0:29

8-Feb-09 0:29

It's possibly trying to initialise SCManager before your CWinApp instance? Try doing this, see if it makes a difference:

Declare SCManager as SCard *SCManager
In your CWinApp's InitInstance, include the code SCManager = new SCard;

That way, you're delaying the use of CWinApp in SCManager construction until the CWinApp is constructed?

[edit]Forgot to say - global variables are bad, m'kay?[/edit]

Parinay Bansal8-Feb-09 0:41

8-Feb-09 0:41

thanks for your interest
but now the code wont compile with 2 errors.

error 1:
error C2040: 'SCManager' : 'class SCard *' differs in levels of indirection from 'class SCard'
AT
SCard *SCManager;

error 2:
error C2582: 'SCard' : 'operator =' function is unavailable
AT
SCManager = new SCard;

-----------------------------------------------------------------------------------
for the 2nd error my opinion is that i will need to override 'operator =' as we do in turbo c++.

i also do have an initial guess
the inline assert says someting about application name
_AFXWIN_INLINE LPCTSTR AFXAPI AfxGetAppName()
{ ASSERT(afxCurrentAppName != NULL); return afxCurrentAppName; }

my idea is if i somehow set afxCurrentAppName to NULL wont it rule out??

Stuart Dootson8-Feb-09 1:09

8-Feb-09 1:09

Well, obviously if you change SCManager from SCard to SCard*, you need to alter the references to it - I thought that went without saying - obviously not.

Parinay Bansal8-Feb-09 1:38

8-Feb-09 1:38

oops
sorry didnt see that coming
sorry for the lame reply

well now i tried id again
but with more number of errors.
the previous two remain when i have changed all refrences from SCManager.function() to SCManager->function()

new error says that scard does not have an overloaded operator -> ???
what exactly to interpret from this?

in my dialog class i define variable as extern SCard SCmanager how to deal with that?

sorry for the silly questions
wont repeat that..

Cedric Moonen8-Feb-09 2:26

Cedric Moonen

8-Feb-09 2:26

Parinay Bansal wrote:
how to deal with that?

Read a good book about C++, it seems you are really lacking some fundamuntal C++ skills yet.
If you declare your variable as extern SCard SCmanager; then it means it is not a pointer, thus you have to use the dot and not the "->" to access members. If you declare it as SCard* SCmanager, then you have to use the "->" because it is a pointer.
This is basic C++ and if you can't grasp those concepts, I'm afraid nobody will be able to help you.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Parinay Bansal8-Feb-09 4:25

How to embed WMP plugin in MFC application?

8-Feb-09 4:25

thank you gentlemen

i was missing out on the part "extern SCard SCManager" replaced with "extern SCard *SCManager"

such a fool i have been

yes sir thank you for your advice,
i really must go back to my c++ basics.
It appears that i have missed out on very basic and important lessons which i sould have taken before starting to develop a full fledged application

i will surely do that from now on.

but yes thanks to you, now my code runs with no error.

i will not forget to get back with any other problems i face in the future.

alizey khan8-Feb-09 0:10

alizey khan

8-Feb-09 0:10

Hi there!!

I want to embed WMP plugin into a dialogue based MFC application..but i m not etting from where to start Frown | :(

anyone can help me in guiding so?

Stuart Dootson8-Feb-09 0:19

8-Feb-09 0:19

You need to embed it as an ActiveX control - this[^] seems a good introduction.

alizey khan8-Feb-09 0:25

alizey khan

8-Feb-09 0:25

but how to embedd it as an active x ctrl? and infact which file of WMP i need to add to my application?

Stuart Dootson8-Feb-09 1:12

8-Feb-09 1:12

alizey khan wrote:
how to embedd it as an active x ctrl

Did you read the page I pointed you at? It really isn't difficult - try reading the doucmentation.

alizey khan wrote:
infact which file of WMP i need to add to my application

What do you mean? The WMP active X control will be a DLL or OCX file that will have to be installed on the system for your application to work. Either you include it in your installer, or you make an assumption that it's already installed.

alizey khan8-Feb-09 1:50

alizey khan

8-Feb-09 1:50

let me rephrase my question:

How can i create an activeX control for WMP 11 using WMP SDK?
can u refer me some link for the steps and WMP11 SDk ASAP...

It will be of great help!

Stuart Dootson8-Feb-09 2:35

Buffer overrun, Strsafe.h compiler options.....

8-Feb-09 2:35

The power of Google led me here - Using the Windows Media Player Control in a C++ Program[^]

ForNow7-Feb-09 23:41

Re: Buffer overrun, Strsafe.h compiler options.....

7-Feb-09 23:41

Hi,

I am running a C app and ran into a Buffer Overrun problem

After debugging the program I Found the offending API to be a

strcpy statement

After researching the problem I deduced the that I needed to use the

corresponding string safe api for strcpy ...StringCchCopy

However when I included strsafe.h I got loads of compile errors

I have warnings a W0 -- Turn of all warnings could this be the

problem ????

Thankx

Cedric Moonen7-Feb-09 23:54

Cedric Moonen

7-Feb-09 23:54

ForNow wrote:
After researching the problem I deduced the that I needed to use the

corresponding string safe api for strcpy ...StringCchCopy

The secure version of strcpy is strcpy_s[^]

ForNow wrote:
I have warnings a W0 -- Turn of all warnings

That's very bad practice. Instead of disabling the warnings, why don't you remove them by writing clean code ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Buffer overrun, Strsafe.h compiler options.....

ForNow8-Feb-09 1:22

Re: Buffer overrun, Strsafe.h compiler options.....

8-Feb-09 1:22

Thankx I'll give it a shot

Jonathan Davies7-Feb-09 23:55

Jonathan Davies

7-Feb-09 23:55

If you've just changed the #include you will get compile errors. StringCchCopy and similar operations take an extra parameter, the length of buffer you are using. Without adding this parameter into the calls you will get errors.

Re: Buffer overrun, Strsafe.h compiler options.....

ForNow8-Feb-09 1:20

Re: Buffer overrun, Strsafe.h compiler options.....

8-Feb-09 1:20

I got compile errors from the Header strsafe.h

Stephen Hewitt8-Feb-09 4:44

Stephen Hewitt

8-Feb-09 4:44

Can you post some of the errors you're getting?

Steve

Re: Buffer overrun, Strsafe.h compiler options.....

ForNow8-Feb-09 7:16