Managed C++/CLI

Re: const char __gc[] to const char []

9-Mar-06 14:58

i will not give up, i will convet this if its the last thing i do....

i am getting better though!!

void ManagedReadVoltage::ManagedDAQmxBaseCreateTask(const char taskName __gc[], TaskHandle *taskHandle)
{
DAQmxBaseCreateTask(taskName,taskHandle);
}

i am stuck here, i get this error...

'DAQmxBaseCreateTask' : cannot convert parameter 1 from 'const char __gc[]' to 'const char []'

the orginal code...

void UnmanagedReadVoltage::UnmanagedDAQmxBaseCreateTask(const char taskName[], TaskHandle *taskHandle)
{
DAQmxBaseCreateTask(taskName,taskHandle);
}

i have looked on google, but i can't get it working..anyway i need some sleep Sleepy | :zzz:

thanks

Michael Dunn10-Mar-06 6:47

Michael Dunn

10-Mar-06 6:47

You need to pin the managed array before passing it to a function that's expecting a native array.

--Mike--
Visual C++ MVP Cool | :cool:

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cross-include two classes

shaohao9-Mar-06 4:24

shaohao

9-Mar-06 4:24

Here is the code:

<br />
//file class1.h<br />
#include "class2.h"<br />
<br />
class A<br />
{<br />
public:<br />
  A(void) {}<br />
  ~A(void) { if ( _cls2) delete _cls2; }<br />
public:<br />
  void Create(void) { _cls2 = new B(this); } // pass class itself to class2<br />
  void Display(void) { printf("from A"); }<br />
private:<br />
  B * _cls2;<br />
};<br />
<br />
// file class2.h<br />
#include "class1.h"<br />
<br />
class B<br />
{<br />
public:<br />
  B(A * ptr) : _cls1(ptr) {}<br />
  ~B(void) {}<br />
public:<br />
  void Do(void) { _cls1->Display(); }<br />
private:<br />
  A * _cls1;<br />
};<br />

But I got error on compiling Frown | :(

How to solve it?

toxcct9-Mar-06 4:45

toxcct

9-Mar-06 4:45

in one of the files, before the definition of the class, declare the other one.

for example :

class A;
 
class B {
    //...
};

shaohao9-Mar-06 5:09

shaohao

9-Mar-06 5:09

You mean combine two .h files into one .h file?

Is it possible to solve it in two .h files?

THX for your quick reply Smile | :)

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 {
    //...
};

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

help with wrapping this code

georgeraafat10-Mar-06 13:43

georgeraafat

10-Mar-06 13:43

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

gmileka

Fu Manchu9-Mar-06 2:18

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

Nemanja Trifunovic9-Mar-06 2:43

9-Mar-06 2:43

Add msvcrt.lib to the linker options.

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Fu Manchu9-Mar-06 3:24

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!

Nemanja Trifunovic9-Mar-06 3:48

9-Mar-06 3:48

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

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Fu Manchu9-Mar-06 4:17

Compiling native C files in C++/CLI solution

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

Judah Gabriel Himango8-Mar-06 16:10

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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Judah Himango

Nemanja Trifunovic9-Mar-06 1:33

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.

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

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!

Nemanja Trifunovic9-Mar-06 3:50

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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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!

Judah Gabriel Himango9-Mar-06 5:04

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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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!

Judah Gabriel Himango9-Mar-06 5:36

9-Mar-06 5:36

Thanks Nish!

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Lent Revisited
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Judah Gabriel Himango9-Mar-06 5:00