C / C++ / MFC

toxcct1-Feb-05 2:10

toxcct

1-Feb-05 2:10

but admit you don't need all the C#'s features to program a simple HC-11 for example...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Yulianto.1-Feb-05 14:23

Yulianto.

1-Feb-05 14:23

Yes true.

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

jhwurmbach1-Feb-05 1:39

jhwurmbach

1-Feb-05 1:39

Yulianto AKA goodmast3r wrote:
But you should learn C#, it`s the future language.

I just have seen some MS-guys marketing the Whidbey compiler saying that C++ will be *the* prime .NET language when it comes to control of the code. It will not be as RAD as VB.NET, but all about control at the coselevel. You can seamlessly go from .NET-Framework to assembler and back to unmanaged C++ in one project.

"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."

-- Caius Petronius, Roman Consul, 66 A.D.

Selvam R31-Jan-05 1:06

Selvam R

31-Jan-05 1:06

Hi,

http://www.functionx.com/managedcpp/index.htm[^]

Good resource for beginers in VC .NET,

http://www.functionx.com/vcnet/index.htm[^]

Hello World for Managed C++,

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cptutorials/html/hello_world_in_managed_extensions_for_c__.asp[^]

Regards,
Selvam

Nick_Fi31-Jan-05 2:46

Nick_Fi

31-Jan-05 2:46

Thank you Selvam for your reply. I've already seen examples of console applications, my question is very specific, regarding the WindowsForms application. I start to think that actually very few programmers use C++ and WindowsForms at the moment, because I asked twice on the microsoft newsgroups and once in here and still nobody told me if it is normal to implement the events functions in the header or not. I talked to a programmer who is using VS .Net 2003 and MFC and he said that when he creates an event, it creates the body for function in the cpp file (as it should be). Which is not the case with WindowsForms. I don't mind having a tiny cpp file and a large header file with all the code in it, if this is what Microsoft intends to do. If that's the case, we should have been warned about this change of strategy...

Regards,
Nicolae

Link Error?

Larsson30-Jan-05 20:16

Larsson

30-Jan-05 20:16

Hello,
I get a link error when I compile, is there anyone that now hat it meens and now how I can fix this?

LINK : warning LNK4098: defaultlib "LIBC" conflicts with use of other libs; use /NODEFAULTLIB:library

rwestgraham30-Jan-05 22:06

rwestgraham

30-Jan-05 22:06

Only one version of the CRT library (C Runtime Library) may be linked to an application.

But different versions of the C Runtime Library exist for different application types - i.e single thread vs multiple thread vs DLL, etc.

You need to make sure the correct CRT library version is linked which in turn depends on your application type.

Search MSDN for the following topics:

"HOWTO: Link with the Correct C Run-Time (CRT) Library"

or just do a search on the LNK4098 error.

This will tell you which specific library you need to link based on your application type and how to exclude the CRT libraries that are not valid for your app.

Robert

Larsson30-Jan-05 23:25

Larsson

30-Jan-05 23:25

Well I have a MFC there I have link a dll. I don't now how I can fix this!.

rwestgraham31-Jan-05 6:30

rwestgraham

31-Jan-05 6:30

Select Project, Settings, and find the Link tab on the dialog. In the project Options box you'll see a bunch of switches. Try adding the following to the end:

NODEFAULTLIB:libcmt.lib /NODEFAULTLIB:msvcrt.lib /NODEFAULTLIB:libcd.lib
/NODEFAULTLIB:libcmtd.lib /NODEFAULTLIB:msvcrtd.lib

Also refer to:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/lnk4098.asp[^]

aj168231-Jan-05 16:08

31-Jan-05 16:08

Try this go to the Project menu in the main window(file,edit,view,project),then go to your project properties then go to the linker,in linker go to Input and in ignore specific libraries add LIBC.

for eg:

Ignore Specific Library LIBC;msvcrt

Arjun Mukherjee
Software Engineer
Hewlett Packard

bitsets

HellFeuer30-Jan-05 19:48

HellFeuer

30-Jan-05 19:48

hey

i was surfing around and stumbled across the bitset.. i'm curious - how does it work??? i didnt think it was possible 2 address single bits in memory..

i got some very funny results with this code:
bitset<10> a;
cout<<sizeof(a);
cout<<" "<<&a[4];
cout<<" "<<&a[4];
cout<<" "<<&a[2];

here's wt i get:
4 0x0012FF74 0x0012FF6C 0x0012FF64

y is sizeof(a) 4????
if i make a bitset of 33 bits, then th size becomes 8, so i gues it gets stored in multiples of 4 bytes??? so if ur nt actualy storing single bits, then wt r bitsets used 4???

and wts with the the addresses?? how is it tht the adress of the same bit is different the second time??? (and even if i change the number in the 4th line from 4 to nethin else, i stil get the same output)

clearly, u cant refer 2 th address of a single bit... then how is a bitset impelemnted???

and because of al this, wudnt they be inherently slow to access???

im new 2 c++ so sorry if iv askd somthin silly

HellFuer

Re: bitsets

C^hris L^osinger31-Jan-05 4:24

C^hris L^osinger

31-Jan-05 4:24

with bitset, operator [] doesn't give you an array element, like it would with a normal C/C++ array. in bitset, operator [] returns the value of the bit at the position you requested.

so, &a[4] isn't the address of the 4th bit, it's the address of the value returned from the [] operator. not very useful.

HellFeuer wrote:
then how is a bitset impelemnted???

looking at the BITSET header file:

template < size_t _N > class bitset {
typedef unsigned long _Ty;
...
private:
	enum {_Nb = CHAR_BIT * sizeof (_Ty),
		_Nw = _N == 0 ? 0 : (_N - 1) / _Nb};
...
_Ty _A[_Nw + 1];

_N is the bitset size. _Nw is the number of bytes required to hold your bits. so, internally, it's an array of unsigned ints - but you can't get at that internal array with the [] operator.

HellFeuer wrote:
and because of al this, wudnt they be inherently slow to access???

yup.

Image Toolkits | Image Processing | Cleek

Debug Assertion failed

aj168230-Jan-05 19:44

30-Jan-05 19:44

HI,
I seem to be getting this error,actually the debugger juist stops and then gives me a dialog box saying Debug Assertion Failed(with ignore,retry,abort).However,none of them help my proj in running.

The box gives me something like
Debug Assertion Failed

File : f:\vs70builds\vc\MFCATL\ship\atlmfc\include\afxcoll.ini
line : 204.

This appears on a particular point everytime,when I try to execute the line
pVar = (CVarData*) m_arrayVariables.GetAt(iVarIndex);
(where CVarData* pVar; & CPtrArray m_arrayVariables;)

This is in a function called GetValue(a member of class CVars).The variable of CVars used to get here is initialised in the constructor of the original class(CHPMumsCtrl) and is a part of public members of the calling class(CCalc).

If anyone can tell me what to do here,then it will help a lot.Can someone tell me the cause anything at all will be helpful.

Thanks.

ThatsAlok30-Jan-05 21:45

ThatsAlok

30-Jan-05 21:45

Try to Run in Relase Mode and Tell, What happen to Project

"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk

aj168230-Jan-05 22:35

30-Jan-05 22:35

Hi Alok,
When I try to run it in release mode then it gives me 462 build errors.Most/all of them look like this.

NewMumsEngine error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall bad_cast::bad_cast(char const *)" (__imp_??0bad_cast@@QAE@PBD@Z)

What do I do now?Any suggestions please?

Thanks,
Arjun.

Arjun Mukherjee
Software Engineer
Hewlett Packard

ThatsAlok31-Jan-05 3:15

ThatsAlok

31-Jan-05 3:15

Exactly what are you making???

"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk

aj168231-Jan-05 15:21

31-Jan-05 15:21

It is an C++ engine that acts as a parser,ie it recieves messages and sends messages. On recieving messages it parses them and then takes action accordingly. It firsts loads a script for processing(parsing),then it displays the script according to the parsed results and sends messages accordingly to the server.

Arjun Mukherjee
Software Engineer
Hewlett Packard

ThatsAlok31-Jan-05 17:34

ThatsAlok

31-Jan-05 17:34

Hi Mr. Arjun
at what point you are getting the debug assertion i.e. during receiving or parsing.

i think it is at the time of parsing,it ususal programmer break the boundry of MS collection arrays.

as assertion is not applicable in RELEASE MODE, thats why i ask you to Build in relase Mode (though it bad programming habit to test the product in release mode),but it surely tell you where you getting error.

hope yuo understand.

"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk

aj16821-Feb-05 0:35

1-Feb-05 0:35

Hi Alok,
When I try to run it in release mode then it gives me 462 build errors.Most/all of them look like this.

NewMumsEngine error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall bad_cast::bad_cast(char const *)" (__imp_??0bad_cast@@QAE@PBD@Z)

The debug assertion failure that i get is a run time error...but in the release mode i get so many errors(build/compile),i cannot even get the project to run,can u help me clear these errors then please

Thanks,
Arjun.

Arjun Mukherjee
Software Engineer
Hewlett Packard

aj16821-Feb-05 0:37

1-Feb-05 0:37

This error occurs during the parsing pahse of the program. The recieved msg is broken down, and strings are created for every sentence/statement and then these strings are resolved.

Arjun Mukherjee
Software Engineer
Hewlett Packard

David Crow31-Jan-05 4:03

David Crow

31-Jan-05 4:03

So have you stepped into the GetAt() method to see why the assertion is firing?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

aj16821-Feb-05 0:41

1-Feb-05 0:41

No actually when I run the statement
pVar = (CVarData*) m_arrayVariables.GetAt(iVarIndex);
where CVarData* pVar;

Then suddenly I am thrown this debug assertion failure window. Please read my first qeury in the thread, and help me if you can.

Thanks
Arjun.

Arjun Mukherjee
Software Engineer
Hewlett Packard

David Crow1-Feb-05 2:29

David Crow

1-Feb-05 2:29

Yes I did read your post, hence my suggestion. Until you step into the GetAt() method and see which assertion is firing and why, you always be left wondering.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow