C / C++ / MFC

3-Mar-04 6:36

I am having a problem compiling a class I downloaded from CodeProject. The class compiles until I try to create a variable of that type, and then I get a linker for each function that I try to call with that variable (to begin with, just the constructor and destructor.) Here are the compiling errors that I am receiving:

error LNK2019: unresolved external symbol "public: __thiscall CMultiColumnComboBox::CMultiColumnComboBox(void)" (??0CMultiColumnComboBox@@QAE@XZ) referenced in function "public: __thiscall NewInvoice::NewInvoice(void)" (??0NewInvoice@@QAE@XZ)

error LNK2001: unresolved external symbol "public: virtual __thiscall CMultiColumnComboBox::~CMultiColumnComboBox(void)" (??1CMultiColumnComboBox@@UAE@XZ)

The class is the CMultiColumnComboBox class from http://www.codeproject.com/combobox/mccombobox.asp#xx169761xx[^] The directions say to include the file in the .cpp file, but then I cannot declare variables in my .h file, so I had to include the class in my .h file. Now I'm getting these linker errors. Can somebody please give me some suggestions? Thanks a bunch!!

jmkhael3-Mar-04 6:42

jmkhael

3-Mar-04 6:42

Did u add the file in the project?

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

DougW483-Mar-04 6:57

3-Mar-04 6:57

yes, the files are included in the project. Sigh | :sigh:

David Crow3-Mar-04 7:18

3-Mar-04 7:18

DougW48 wrote:
The directions say to include the file in the .cpp file, but then I cannot declare variables in my .h file...

Probably because the two .h files are in the wrong order. The #include <MultiColumnComboBox.h> statement should precede the inclusion of your dialog's .h file. Or, if your dialog declaration is going to be used in places other than by its definition, you'll need the #include <MultiColumnComboBox.h> statement in the dialog's .h file instead, before any reference to the CMultiColumnComboBox class.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

DougW483-Mar-04 7:44

3-Mar-04 7:44

Found the problem, thank you very much! Big Grin | :-D

David Crow3-Mar-04 7:47

3-Mar-04 7:47

DougW48 wrote:
Found the problem...

So what was it?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

DougW483-Mar-04 8:16

fatal error RC1015: cannot open include file 'afxres.h'

3-Mar-04 8:16

When I included the files, the visual studios put them in a separate virtual folder called "Solution Items" I moved them into the same area of my solution explorer as my other files, and it compiled without a hitch. Now if I could just figure out how to update the class to work in 2000/XP I'll be all set, but that's for a different post! Thanks a bunch for your help!

Music Application

mavgoose3-Mar-04 6:16

mavgoose

3-Mar-04 6:16

How would you go about attaching 'winnm.dll' to a project? I am just unable to get my head around linking the dll files then accessing them. Do i need to create a header file?
What will i then need to include in the header file? I need to create a simple keyboard which uses low level design to produce sound through the sound card. OMG | :OMG:

Any help would be appreciated.
Cheers

Mav

Re: Music Application

James R. Twine3-Mar-04 7:49

James R. Twine

3-Mar-04 7:49

If you are thinking winmm.dll, you do not directly link DLLs to a project, you link the import library for them with the project. Try adding winmm.lib to your list of Libraries to link with.

Peace!

-=- James (Sonork:100.21837)
[Tip for SUV winter driving survival: "Professional Driver on Closed Course" does not mean "your Dumb Ass on a Public Road"!]
[Get Delete FXP Files Now!]

spingkoy3-Mar-04 6:07

spingkoy

3-Mar-04 6:07

Good Day,

Everytime i create or open a project, an error occur:
fatal error RC1015: cannot open include file 'afxres.h'.
I searched and found the problem in Microsoft site:
http://support.microsoft.com/default.aspx?scid=kb;ja;326987
but i could not read the file coz i dont have the OS installer
to support the language.

I already reinstall Visual Studio but the same things happen.

Thanks a lot.

spingkoy

Re: fatal error RC1015: cannot open include file 'afxres.h'

David Crow3-Mar-04 7:24

Re: fatal error RC1015: cannot open include file 'afxres.h'

3-Mar-04 7:24

The MSDN article Q156916 gives pretty detailed steps on how to fix it. Did you try compiling the .RC file into a .RES file?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

spingkoy3-Mar-04 7:48

spingkoy

3-Mar-04 7:48

I tried to search the article Q156916, it has been referred to Article - 156916.
The article talks about J++. I tried renaming the .rc to .rct or .res but when i load the
project and go on the resource tab, the same error appear.

spingkoy

Re: fatal error RC1015: cannot open include file 'afxres.h'

David Crow3-Mar-04 7:52

Re: fatal error RC1015: cannot open include file 'afxres.h'

3-Mar-04 7:52

spingkoy wrote:
I tried renaming the .rc to .rct or .res...

It has to be compiled, not renamed.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

spingkoy4-Mar-04 4:35

spingkoy

4-Mar-04 4:35

I've compiled it, but same things happen.
Im having a dual boot so I've tried re-installing
on the other OS and it works. I think its cause is
software conflict. I did know that my friend
installed Visual Studio on the other OS.

Thanks for the support.

Have a nice day and More Power to you.

spingkoy

Subclassing : overloaded methods

Jerome Conus3-Mar-04 5:51

3-Mar-04 5:51

Hi !

I'm facing a very strange problem with the code snippet below.

I'm creating a base class (JSBase) which provides two virtual methods. These two methods have the same name.

In a derived class, I reimplement only one of these two methods.

In the main(), I instanciate the derived class and call one of the method of the base class (the one which has not be reimplemented in the derived class).

When I compile, I get this error :

.\TestDerive.cpp(64) : error C2664: 'import' : cannot convert parameter 1 from '
class ClassTest1' to 'class ClassTest2'
No constructor could take the source type, or constructor overload resol
ution was ambiguous

What's wrong ? Can't I reimplement only one of the method in the derived class ?
I would appreciate a lot your help !
Thanks !
Jerome

class ClassTest1 {};
class ClassTest2 {};

// Base class
class JSBase
{
public:
	JSBase() {};
	virtual ~JSBase() {};

	virtual void import(ClassTest1 Data) {};
	virtual void import(ClassTest2 Data) {};
};

// Derived class
class JSDerived : public JSBase
{
public:
	JSDerived() : JSBase() {};
	~JSDerived() {};

	void import(ClassTest2 Data) {};
};

// Main
void main(int argc, char* argv[])
{
	JSDerived MyDerived;
	ClassTest1 MyData;
	MyDerived.import(MyData);
}

jmkhael3-Mar-04 6:02

jmkhael

3-Mar-04 6:02

you implemented void import(ClassTest2 Data) {};

but calling MyDerived.import(MyData); with MyData of type ClassTest1

See the prob?

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Jerome Conus3-Mar-04 9:17

3-Mar-04 9:17

Hi Papa !

Sure, I'm calling the 'import()' method with a parameter of type ClassTest1. The base class has such a method. Why is this method not accessible from the derived class ? This is what is strange for me !

Jerome

Re: Subclassing : overloaded methods [EDITED]

toxcct3-Mar-04 6:35

toxcct

3-Mar-04 6:35

try to create a cast operator...
operator (ClassTest2)

TOXCCT >>> GEII power

John M. Drescher3-Mar-04 9:13

John M. Drescher

3-Mar-04 9:13

Are you using vs6?

[EDIT]
I thought it was a bug with vc6 but it does the same in vc7 too.

One thing you can do is define void import(ClassTest1 Data) {};

and have it call the base:

void import(ClassTest1 Data) {
   JSBase::import(Data);
};

[/EDIT]

John

Jerome Conus3-Mar-04 9:18

3-Mar-04 9:18

Hi John !
Yes, I am....a bug with VS 6 ????

Jerome

Re: Subclassing : overloaded methods [EDITED]

John M. Drescher3-Mar-04 9:26

John M. Drescher

3-Mar-04 9:26

Reread my previous post, I edited it while you were replying..

John

Jerome Conus3-Mar-04 9:41