C / C++ / MFC Discussion Boards

Owner drawn14-Feb-06 0:25

14-Feb-06 0:25

toxcct wrote:
but i plan to make a little program which gets the text you post and automatically adds the CP CSS tags for the colors :

Sure, sure!

Owner drawn
Jesus Loves

Re: a question regarding CStringList

namaskaaram13-Feb-06 22:38

namaskaaram

13-Feb-06 22:38

hello cedric!
actually that what i did!...he is the small snippet!....i get an error!

CObject* pObject1;<br />
pObject1 = myList1->GetAt(myList1->FindIndex( 0 ));//ERROR!!!!!<br />
myList1->RemoveAt(myList1->FindIndex( 0 ));<br />
delete pObject1;

error C2679: binary '=' : no operator defined which takes a right-hand operand of type 'class CString' (or there is no acceptable conversion)

what do i do?any ideas? Sigh | :sigh:

Re: a question regarding CStringList

Cedric Moonen14-Feb-06 1:08

Cedric Moonen

14-Feb-06 1:08

What is the type of myList1 ??
From the MSDN:

CObject*& GetAt(
   POSITION position 
);

Are you sure the error comes at this line ?

is there anyway of getting the CString* from LPCTSTR

namaskaaram14-Feb-06 2:01

namaskaaram

14-Feb-06 2:01

yeah!....u see as long as i typecast it to LPCTSTR and that too to an LPCTSTR i dont get an error.....
in teh MSDN it says that for CStringList teh returned parameter will alwayz be replaced from CString* to LPCTSTR.....

so is there a way of getting CString* from LPCTSTR?.....i mean after all LPCTSTR is a pointer inside the CString object!

Windows Sockets implementation

Rohan Bhosale13-Feb-06 19:50

Rohan Bhosale

13-Feb-06 19:50

I have used Winsock2 for my application to communicate with the device over
TCPIP socket.I get the following sequence of events .
1. The Application that runs the Client socket is alive.But after about 24
hrs. the network connectivity for the Machine is disabled.
2. On further investigation of the issue I found that in the Event viewer
the event has been noted as Event ID -2019 and the note alongside is
"The server was unable to allocate from the system nonpaged pool because the
pool was empty."
Do help me out with this. As I have no clue as to why it behaves so.

C++ Functions

Subramaniam s.V.13-Feb-06 19:28

Subramaniam s.V.

13-Feb-06 19:28

Hi All,

Can anyone tell me where is the memory allocated for a function?. Consider the following example

class A
{
int a;
int b;
void f1();
};

void main()
{
A obj1;
}

Now, in this case, assume that for variable 'a' the address would be 5000 and for 'b' it would be 5004. These 2 varialbes are present in the stack. Now, where does my function lie. Is it placed in the stack? or somewhere else. How do I find the address of the function and know as where it is placed?

can anyone help me on this.

Re: C++ Functions

Stephen Hewitt13-Feb-06 19:38

Stephen Hewitt

13-Feb-06 19:38

Take the address of the function. This is a little tricky for member functions. It goes something like this:

class A<br />
{<br />
  int a;<br />
  int b;<br />
  void f1();<br />
};<br />
 <br />
// Later in some functiom<br />
void (A::*pAFnPtr)() = &A::f1;<br />
// Now the variable "pAFnPtr" contains the address of the function.<br />

Re: C++ Functions

Subramaniam s.V.13-Feb-06 19:44

Subramaniam s.V.

13-Feb-06 19:44

Right.I can get the address of the function using funtion pointers. It will surely work fine, but I just want to know as where the function is stored. What is the address that I get as the output for the above code snippet that you have given. Is it a stack or some other random memory location or something else?

To the best of my knowledge I feel that functions does not get stored in the stack. Correct me if I am wrong and do let me know your suggestions on this.

Thanks In Advance

Re: C++ Functions

Stephen Hewitt13-Feb-06 19:47

Stephen Hewitt

13-Feb-06 19:47

It will be an address within the memory where the loader mapped the .EXE or DLL file. It is not on the stack or the heap. The code above will give the the address of the function (or perhaps a incremental link thunk or an adjustor thunk).

Steve

Re: C++ Functions

Subramaniam s.V.13-Feb-06 20:01

Subramaniam s.V.

13-Feb-06 20:01

Thanks for your information Steve.

ActiveX

Anilkumar K V13-Feb-06 18:42

Anilkumar K V

13-Feb-06 18:42

I have an activeX control in a htmal page (say second.htm), when I try to open this page from another htm page (say first.htm) and do some process in ActiveX and close the second.htm. This causes the first.htm also closed. is it due to a crash?

window.open("second.html", "myPage");

What proble forceing the parent page to close?

Linker error

Rassul Yunussov13-Feb-06 18:41

Rassul Yunussov

13-Feb-06 18:41

If i make a library, consists of two files, for example - foo.h, foo.cpp,
where i described a class foo:
foo.h file:

<br />
class foo<br />
{<br />
...<br />
public:<br />
       foo();<br />
       void method();<br />
};<br />
<br />
foo.cpp file:<br />
#include "foo.h"<br />
foo::foo()<br />
{<br />
}<br />
foo::method()<br />
{<br />
}<br />

and then i make a new project, copy this files in the project and in file stdafx.h i write next string
#include "foo.h"
the linker says that can't link... What am i doing wrong?

So... I hope i described my problem clearly Smile | :)

Sorry for my bad english Sigh | :sigh:

-- modified at 1:05 Tuesday 14th February, 2006

Re: I got question

Stephen Hewitt13-Feb-06 18:46

Stephen Hewitt

13-Feb-06 18:46

Firstly you're missing a void:

void foo::method()<br />
{<br />
}

I'm not sure about the link error.

Steve

Re: I got question

Rassul Yunussov13-Feb-06 19:10

Rassul Yunussov

13-Feb-06 19:10

It is just mistake in forum...
Exactly - i got :
error LNK2001: unresolved external symbol "public: __thiscall CFooClass::~CFooClass(void)" (??1CFooClass@@QAE@XZ)

Re: I got question

kakan13-Feb-06 19:14

kakan

13-Feb-06 19:14

It seems as if the destructor (~FooClass()) is present in the .h file, but missing in the cpp file.
Add it to the cpp file.

[Message Deleted]

Stephen Hewitt13-Feb-06 19:14

Stephen Hewitt

13-Feb-06 19:14

[Message Deleted]

Re: I got question

Stephen Hewitt13-Feb-06 19:15

Stephen Hewitt

13-Feb-06 19:15

Looks like like your class has declared a destructor but not defined it. ie:

// .h File.<br />
class CFooClass<br />
{<br />
public:<br />
  CFooClass();<br />
  ~CFooClass();<br />
};<br />
<br />
// .CPP file<br />
CFooClass::CFooClass()<br />
{<br />
  // Blah.<br />
}<br />
 <br />
// Where is "CFooClass::~CFooClass() {}" ?<br />

Re: I got question

Rassul Yunussov13-Feb-06 19:34

Rassul Yunussov

13-Feb-06 19:34

Yes, it looks like i don't have a destructor in my cpp file, but i have...
I found a way you can check it - in the wizard you can create a new class, but then delete it from the solution, and include it just in stdafx.h. You'll get the same error as I... So my question is - how to include library, without insertig library in the project

Re: I got question

Stephen Hewitt13-Feb-06 19:44

Stephen Hewitt

13-Feb-06 19:44

Are you just including the .H file in your project without the corresponding .CPP file? If this is the case the impementation must come from somewhere...Perhaps you want to build a static library (.LIB file). When you do this you just include the .H file and add the .LIB file to the linker tab (or use a #pragma comment(lib, "libname.lib")).

Steve

Is this correct?

kakan13-Feb-06 20:01

kakan

13-Feb-06 20:01

Look at the missing func:
"public: __thiscall CFooClass::~CFooClass(void)"

If it's ment to be a destructor, wouldn't it look like this:
"public: __thiscall CFooClass::~CFooClass()"
That is, without the "void" ?

Re: I got question

ThatsAlok14-Feb-06 21:42

ThatsAlok

14-Feb-06 21:42

Rassul Yunussov wrote:
Exactly - i got :error LNK2001: unresolved external symbol "public: __thiscall CFooClass::~CFooClass(void)"

Either you fail to include the .cpp or .library file

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

How often do you use makefiles?

Nick_Kisialiou13-Feb-06 18:32

Nick_Kisialiou

13-Feb-06 18:32

The question relates only to large projects (defined as >= 100,000 lines of code) compiled with Visual C++ compiler. If you work(ed) on such projects, I would appreciate if you could share your experience. Is it a must in this case? Thanks!

Nick Kisialiou

Re: How often do you use makefiles?

Rage13-Feb-06 22:18

Rage

13-Feb-06 22:18

every day. What do you need exactely ?

~RaGE();

Re: How often do you use makefiles?

BadKarma13-Feb-06 22:29

BadKarma

13-Feb-06 22:29

Hi,

whats the benifit of using make files instead of the Rebuild option in VS itself.

Is it better/faster on single project solution?
Or is it better/faster on multi project solutions?

I notice that the build option in VS isn't 100% safe (sometimes it doesn't notice changed code)
could a make file help me in this.

codito ergo sum

Re: How often do you use makefiles?

Nick_Kisialiou13-Feb-06 22:36

Nick_Kisialiou

13-Feb-06 22:36

I mean exactly what BadKarma says. Have you ever done a large project without command line compiling/linking? Is it worth planning in advance that the project be compiled in command line, possibly later in the development cycle?

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