Managed C++/CLI

Christian Graus5-Dec-06 23:23

5-Dec-06 23:23

When you say it doesn't compile, what is the error ?

Did you #include what you're trying to use ?

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Anil_vvs5-Dec-06 23:56

5-Dec-06 23:56

Hi Christian,

Now the previous error disappeared. But I still get

error C2079: 'Logger::m_oStream' uses undefined class 'std::basic_ofstream<_Elem,_Traits>'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]

Can you please help? I am using Visual Studio .Net 2003

Thanks and Regards,
Anil

Nish Nishant6-Dec-06 5:00

Nish Nishant

6-Dec-06 5:00

If you could post a minimal code snippet that reproduces the error, it'd be easier to figure otu what headers you are missing.

Regards,
Nish

Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
Currently working on C++/CLI in Action for Manning Publications. (*Sample chapter available online*)

Christian Graus6-Dec-06 8:34

6-Dec-06 8:34

Are you including iostream ( not iostream.h ) ?

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Anil_vvs6-Dec-06 17:18

6-Dec-06 17:18

right chris.....i am including iostream.....any problem with that...??

Christian Graus6-Dec-06 17:27

6-Dec-06 17:27

No - you need to post your code for us to be able to help more.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Anil_vvs6-Dec-06 17:55

6-Dec-06 17:55

my .h file

#pragma once

using namespace std;
class Logger
{
public:
Logger(void);
~Logger(void);
private:
char *m_pFileName;
std::ofstream m_oStream;
public:
void LogMsg(char * functionName, char * condition);
};

cpp file

#include "StdAfx.h"
#include <iostream>
#include ".\logger.h"

Logger::Logger(void)
: m_pFileName(NULL)
{
m_pFileName = "E:\\projects\\something.log";
m_oStream.open(m_pFileName, std::ios_base::app);
}

Logger::~Logger(void)
{
}

void Logger::LogMsg(char * functionName, char * condition)
{
}

Thanks in Advance for any help....[ Smile | :)

]

Christian Graus6-Dec-06 18:01

6-Dec-06 18:01

Anil_vvs wrote:
std::ofstream m_oStream;

std:: is a waste of time, you've put a using above it. However, if you want a member variable, the #include needs to be in the .h, not the .cpp. Alternatively, you can put it in an anonymous namespace in the cpp.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Anil_vvs6-Dec-06 18:52

Help with converting GMT time to AEDT time in c++

6-Dec-06 18:52

Thanx a lot Chris.....will try that... Smile | :)

dusty1435-Dec-06 17:49

dusty143

5-Dec-06 17:49

I am getting live data with gmt time in a string. but I want to convert it to local AEDT time & store the time difference 'timediff' in a variable.

Thanks a lot in advance

Re: Help with converting GMT time to AEDT time in c++

User 5838525-Dec-06 18:41

memory & handle increase when using IXMLDOMDocument::load(),

5-Dec-06 18:41

G'day mate, you're in the wrong part of the world. Check out the C++/MFC forum.

Have a look at the time_t structure and the assosiated routines

System.IO.Path.IsPathRooted() does not behave as I would expect

neerajkchauhan4-Dec-06 17:18

neerajkchauhan

4-Dec-06 17:18

hi
i am facing memory & handle problem when my application invoke IXMLDOMDocument::load(), even i have used IXMLDOMDocument::Release() each time when i load new xml file, but its continuously increasing the memory and handle usage,
your help will be greatly appreciated

Thanks & Regards
neeraj

neeraj

Re: memory & handle increase when using IXMLDOMDocument::load(),

George L. Jackson4-Dec-06 23:37

undefined reference... [modified]

4-Dec-06 23:37

This is the C++/CLI forum. We help with Managed C++ here. If you are doing so kind of mix mode programming, you need to provide some sample code of your problem. Otherwise, you need to post your question in the C++ forum also with some sample code illustrating your problem.

thathvamsi4-Dec-06 16:03

thathvamsi

4-Dec-06 16:03

hi all,
I have declared and defined a function as
inside example.h
static int func1(struct st1 ex1, ....);
inside example.c

static int func1(struct st1 ex1,...)<br />
{<br />
---<br />
---<br />
---<br />
}

I export these functions in test.h as:

extern int func1(struct st1 ex1,...);<br />

and inside test.c, I try to call func1

<br />
#include "test.h"<br />
int main( void )<br />
{<br />
<br />
---<br />
---<br />
struct st1 ex1;<br />
int f1;<br />
f1= func1(ex1,...);<br />
}

The compiler returns with the error: undefined reference to func1.
Can anyone help me with what is wrong? My guess is : that it is to do with static; as I have defined and declared the func1 as static inside the example.h & example.c? But I dont know how to resolve?
Thanks.

-- modified at 22:12 Monday 4th December, 2006

Re: undefined reference...

Christian Graus4-Dec-06 17:46

Re: undefined reference...

4-Dec-06 17:46

If your program is C, it can't possibly be managed C++. Try the Visual C++ forum.

I see no evidence that you've included example.h inside test.c

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

thathvamsi4-Dec-06 18:08

thathvamsi

4-Dec-06 18:08

test.h contains all the exported functions from example.h and its definition is in example.c.
test.h is included in the test.c.
Isnt that correct? or should i inlcude example.h also inside test.c??
if a function is declared static, how can i use it in another fileby exporting it?

Re: undefined reference...

Pierre Leclercq5-Dec-06 2:11

Pierre Leclercq

5-Dec-06 2:11

You simply cannot call func1 from main, if main is in another file.
That is what static is for, to prevent a function from being seen
outside its definition file.

So remove the static keyword and it will compile.
(Assuming there's no other problem Smile | :)

)
BTW you should rather use a class member function (in this case static would be ok).

IDE Code completion & templates

User 5838524-Dec-06 13:19

4-Dec-06 13:19

I have the following in a c++/cli library project

template<typename T>
public ref class BaseTemplateClass
{
public:
BaseTemplateClass()
{
}

void BaseClassFunction()
{
}
};

public ref class DerivedClass : public BaseTemplateClass<System::Int32>
{
public:
DerivedClass()
{
}
void DerivedClassFunction()
{
}
};

In My c# client if I type
DerivedClass d = new DerivedClass();
d.

The little popup window appears with the method list and it does not contain BaseClassFunction().
If I type the name manually it works fine. Any ideas why I cant see the method from the template base class in the code complettion window?

George L. Jackson4-Dec-06 14:39

4-Dec-06 14:39

Metadata is not produced for template functions and template classes.

User 5838524-Dec-06 14:44

4-Dec-06 14:44

Thanks George,

Is there any way to overcome this? I am only using the templates in the managed c++ lib so all the classes are generated from the template at compile time.

System.IO.Path.IsPathRooted() does not behave as I would expect

George L. Jackson4-Dec-06 14:54

4-Dec-06 14:54

http://msdn2.microsoft.com/en-gb/library/sbh15dya.aspx[^]:

<quote>The common language runtime specifically supports generics in MSIL. Because the runtime knows about generics, specific types can be substituted for generic types when referencing an assembly containing a generic type. Templates, in contrast, resolve into ordinary types at compile time and the resulting types may not be specialized in other assemblies.

There is no real solution unless you can mix generics with templates for C# and VB, or wrap the template code.

User 5838524-Dec-06 15:00

4-Dec-06 15:00

George L. Jackson wrote:
Templates, in contrast, resolve into ordinary types at compile time and the resulting types may not be specialized in other assemblies

Yeah thats why I would have expected the compiler to produce the metadata. Thanks again for your help

I just want to avoid a situation where our c# team ask me everyday "why cant I see those methods" or "this class doesnt have that method"

System.IO.Path.IsPathRooted() does not behave as I would expect

George L. Jackson4-Dec-06 15:20