Re: help with wrapping this code - Managed C++/CLI Discussion Boards

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Re: cross-include two classes

toxcct9-Mar-06 5:12

toxcct

9-Mar-06 5:12

shaohao wrote:
You mean combine two .h files into one .h file?

file A.h
 
#include "B.h"
 
class A {
    //...
};

file B.h
 
#include "A.h"
 
class A;
class B {
    //...
};

Re: cross-include two classes

shaohao10-Mar-06 3:09

shaohao

10-Mar-06 3:09

But I think it should be:

<br />
file A.h<br />
<br />
#include "B.h"<br />
<br />
class A {<br />
    //...<br />
};<br />

<br />
file B.h<br />
<br />
// not include A.h<br />
class A;<br />
<br />
class B {<br />
    //...<br />
};<br />

Any idea?
Is it right?
-- modified at 9:11 Friday 10th March, 2006

Re: cross-include two classes

georgeraafat10-Mar-06 13:43

georgeraafat

10-Mar-06 13:43

Yes - this is correct. It compiles without a problem.

gmileka

help with wrapping this code

Fu Manchu9-Mar-06 2:18

Fu Manchu

9-Mar-06 2:18

i thought it would be better to make a new tread for this one.

i am trying to get this code to work, but i don't know what i'm doing wrong..

i know this much....

i have a class library(.net) called fooManaged and its automatical created fooManaged.h. and i created UnManaged.h

in the UnManaged.h file i have this code.....

#include iostream
#include vcclr.h
using namespace std;

class Foo
{
public:
Foo();
~Foo();
void DoSomeFoo();
};

// constructor
Foo::Foo()
{
cout<<"Constructor called!"<<endl;
}
destructor
foo::~foo()=""
{
cout<<"destructor="" called"<<endl;
}

="" some="" method
void="" foo::dosomefoo(void)

{
cout<<"do="" something="" funny!"<<endl;
cout<<"burrrp!"<<endl;
}

in="" foomanaged.h="" i="" have="" this="" code....

="" foomanaged.h

#pragma="" once
using="" namespace="" system;

namespace="" foomanaged
{
public="" __gc="" class="" mfoo
{=""
private:
foo="" *="" _foo;
public:
mfoo();
~mfoo();
void="" manageddosomefoo();
};
="" constructor
mfoo::mfoo()=""
{
_foo="new" foo();
}
="" destructor
mfoo::~mfoo()
{
delete="" _foo;
}

="" mfoo::manageddosomefoo()=""
{
_foo-="">DoSomeFoo();
}

}

the fooManaged.cpp file just has...

#include "stdafx.h"
#include "Unmanagedfoo.h"
#include "fooManaged.h"
#using mscorlib.dll

it all compiles...but there is a big linking error!!

Compiling...
fooManaged.cpp
Linking...
LINK : error LNK2020: unresolved token (0A000005) _CxxThrowException
LINK : error LNK2020: unresolved token (0A000019) free
LINK : error LNK2020: unresolved token (0A00001A) strlen
LINK : error LNK2020: unresolved token (0A00001B) memmove
LINK : error LNK2020: unresolved token (0A00001C) memcpy
LINK : error LNK2020: unresolved token (0A00001D) delete
LINK : fatal error LNK1120: 6 unresolved externals

i must be doing something wrong, some help with this will be very wecome

thanks

Re: help with wrapping this code

Nemanja Trifunovic9-Mar-06 2:43

Nemanja Trifunovic

9-Mar-06 2:43

Add msvcrt.lib to the linker options.

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Re: help with wrapping this code

Fu Manchu9-Mar-06 3:24

Fu Manchu

9-Mar-06 3:24

i dont know how to do that, so i guessed at added msvcrt.lib to the command line in addional options in the linker properties, but i get even more errors!

Re: help with wrapping this code

Nemanja Trifunovic9-Mar-06 3:48

Nemanja Trifunovic

9-Mar-06 3:48

Project's Property Pages dialog box -> Linker->Input. Add msvcrt.lib to the Additional Dependencies.

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Re: help with wrapping this code

Fu Manchu9-Mar-06 4:17

Fu Manchu

9-Mar-06 4:17

thanks man, i've done that but i am stil getting errors when linking, just two though...

Linking...
libcpmtd.lib(xdebug.obj) : error LNK2019: unresolved external symbol __malloc_dbg referenced in function "void * __cdecl operator new(unsigned int,struct std::_DebugHeapTag_t const &,char *,int)" (??2@YAPAXIABU_DebugHeapTag_t@std@@PADH@Z)
libcpmtd.lib(_tolower.obj) : error LNK2001: unresolved external symbol __malloc_dbg
libcpmtd.lib(xdebug.obj) : error LNK2019: unresolved external symbol __free_dbg referenced in function "void __cdecl operator delete(void *,struct std::_DebugHeapTag_t const &,char *,int)" (??3@YAXPAXABU_DebugHeapTag_t@std@@PADH@Z)
C:\Documents and Settings\Major Pigeon\My Documents\Visual Studio Projects\fooManaged\Debug\fooManaged.dll : fatal error LNK1120: 2 unresolved externals

Compiling native C files in C++/CLI solution

Judah Gabriel Himango8-Mar-06 16:10

Judah Gabriel Himango

8-Mar-06 16:10

Ok so I've got my C++/CLI solution, which now includes some old native C files (not C++ files). I don't want these C files to be compiled to managed; I just want to be able to call them from my managed ref classes in my C++/CLI solution. How can I do that? The compiler complains it won't compile .c files with the /clr syntax.

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Re: Compiling native C files in C++/CLI solution

Nemanja Trifunovic9-Mar-06 1:33

Nemanja Trifunovic

9-Mar-06 1:33

Judah Himango wrote:
The compiler complains it won't compile .c files with the /clr syntax.

Yeah, one of "advances" that came with VS2005.

Anyway, try to simply rename the c files to cpp and compile. You may get some compiler errors, but they should not be hard to fix.

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Re: Compiling native C files in C++/CLI solution

Nish Nishant9-Mar-06 2:53

Nish Nishant

9-Mar-06 2:53

Nemanja Trifunovic wrote:
Anyway, try to simply rename the c files to cpp and compile. You may get some compiler errors, but they should not be hard to fix.

Or put the C files into a native DLL and export the required functions out of it.

Regards,
Nish

Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
The Ultimate Grid - The #1 MFC grid out there!

Re: Compiling native C files in C++/CLI solution

Nemanja Trifunovic9-Mar-06 3:50

Nemanja Trifunovic

9-Mar-06 3:50

Nishant Sivakumar wrote:
Or put the C files into a native DLL and export the required functions out of it.

Out of curiosity - would it work with a static lib rather than a dll? I am too lazy to try Blush | :O

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Re: Compiling native C files in C++/CLI solution

Nish Nishant9-Mar-06 5:25

Nish Nishant

9-Mar-06 5:25

Nemanja Trifunovic wrote:
Out of curiosity - would it work with a static lib rather than a dll? I am too lazy to try

I haven't tried a static lib myself either, but I do remember a few people complaining how that's caused problems for them.

Regards,
Nish

Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
The Ultimate Grid - The #1 MFC grid out there!

Re: Compiling native C files in C++/CLI solution

Judah Gabriel Himango9-Mar-06 5:04

Judah Gabriel Himango

9-Mar-06 5:04

I'm not a C++ guy by trade, so maybe this is a stupid question, but how do I export the native functions out of it so that my C++/CLI dll can see those functions? Blush | :O

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Re: Compiling native C files in C++/CLI solution

Nish Nishant9-Mar-06 5:26

Nish Nishant

9-Mar-06 5:26

Judah Himango wrote:
I'm not a C++ guy by trade, so maybe this is a stupid question, but how do I export the native functions out of it so that my C++/CLI dll can see those functions?

http://msdn2.microsoft.com/en-us/library/ys435b3s.aspx[^]

Regards,
Nish

Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
The Ultimate Grid - The #1 MFC grid out there!

Re: Compiling native C files in C++/CLI solution

Judah Gabriel Himango9-Mar-06 5:36

Judah Gabriel Himango

9-Mar-06 5:36

Thanks Nish!

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Judah Himango

Re: Compiling native C files in C++/CLI solution

Judah Gabriel Himango9-Mar-06 5:00

Judah Gabriel Himango

9-Mar-06 5:00

Yeah I tried that, several hundred compiler errors. Cry | :((

Even if I did get it to compile, wouldn't that be compiled to managed code? I don't need this particular piece of code in managed land...

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Converting CLR String to LPCSTR

Judah Gabriel Himango8-Mar-06 15:49

Judah Gabriel Himango

8-Mar-06 15:49

I've got a C++/CLI library I'm using to wrap some native C methods in order to call them easily from another .NET language.

This is probably an easy question, but how can I convert a .NET string (System::String) to a LPCSTR? I'm new the the CLI extensions for C++, and google doesn't give me anything other than the old MSDN article which refers to solutions using the old MC++ syntax.

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Re: Converting CLR String to LPCSTR

Nish Nishant8-Mar-06 16:02

Nish Nishant

8-Mar-06 16:02

Judah Himango wrote:
I've got a C++/CLI library I'm using to wrap some native C methods in order to call them easily from another .NET language.

This is probably an easy question, but how can I convert a .NET string (System::String) to a LPCSTR? I'm new the the CLI extensions for C++, and google doesn't give me anything other than the old MSDN article which refers to solutions using the old MC++ syntax.

Hello Judah,

See http://www.codeproject.com/managedcpp/StringConvertor.asp[^]

If you don't want to use the class, look at the source code to see how it's done.

Regards,
Nish

Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
The Ultimate Grid - The #1 MFC grid out there!

Re: Converting CLR String to LPCSTR

Judah Gabriel Himango8-Mar-06 16:04

Judah Gabriel Himango

8-Mar-06 16:04

Excellent, I should've searched CP first. Smile | :)

Thanks Nish.

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Judah Himango