Managed C++/CLI

13-Jan-06 4:48

It's been a while since I used VC 2003 to do a managed DLL, but if I remember right, it does break into the source code for the VC6 DLL, provided there's debug information in it.

Regards,
Nish

Copy Constructors

Tom Moore13-Jan-06 1:11

Tom Moore

13-Jan-06 1:11

Hi,

I've just got Visual Studio 2005 Standard Edition and was writing a new CLR class

using this code

<br />
#using "System.dll"<br />
<br />
using namespace System;<br />
<br />
<br />
public ref class SimpleClass<br />
{<br />
public:<br />
	SimpleClass();<br />
	SimpleClass(System::String^ str,System::Int32 age);<br />
	~SimpleClass();<br />
	<br />
System::String^ GetName()  {return _str;}<br />
void  SetName(System::String^ str) {_str = str;}<br />
 System::Int32 GetAge()  {return _age;}<br />
<br />
private:<br />
	System::Int32 _age;<br />
	System::String^ _str;<br />
};<br />
<br />
SimpleClass::SimpleClass()<br />
{}<br />
<br />
SimpleClass::~SimpleClass()<br />
{}<br />
<br />
SimpleClass::SimpleClass(System::String^ str,System::Int32 age)<br />
{<br />
	_str = str;<br />
	_age = age;<br />
}<br />

then i wrote a cpp file

<br />
#include "simpleclass.h"<br />
<br />
int main()<br />
{<br />
	SimpleClass SC = gcnew SimpleClass("Bob",13);<br />
<br />
	Console::WriteLine(SC.GetAge());<br />
<br />
<br />
	return 0;<br />
}<br />

I tried two modifactions both using the new '^' handle operator and normal class by saying
SimpleClass SC = gcnew SimpleClass().

However when i tried using "gcnew SimpleClass() it came up with error, no copy constructor.

So I wrote this :

<br />
SimpleClass(const SimpleClass& rhs);<br />

and it came up with several errors.

How do you write a copy constructor in C++ 2.0 please Smile | :)

Thanks

Tom

Re: Copy Constructors

Nish Nishant13-Jan-06 3:19

13-Jan-06 3:19

>>SimpleClass SC = gcnew SimpleClass();<<

SC is not a handle type. gcnew returns a handle.

You need to do one of these :-

SimpleClass^ SC = gcnew SimpleClass();

or

SimpleClass SC; //stack semantics

You don't need a copy constructor.

Regards,
Nish

-- modified at 9:20 Friday 13th January, 2006

Re: Copy Constructors

Tom Moore14-Jan-06 11:37

Tom Moore

14-Jan-06 11:37

Hi Nisht,

Thanks for the help!

I wanted to use like the class like this.

public ref class Class1 {

public:
void foo() {Console::Writeline("Hello World");
}

Class^ C1 = gcnew Class1();
C1->foo();

Class C2;
C2.foo()

Can that be done with managed classes.

Tom

Re: Copy Constructors

Nish Nishant14-Jan-06 17:22

14-Jan-06 17:22

Tom Moore wrote:
Class^ C1 = gcnew Class1();
C1->foo();

Class C2;
C2.foo()

Can that be done with managed classes.

Yes, that is possible. See my article on stack semantics for more details :-

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

Regards,
Nish

Dynamically created property

Soundman32.211-Jan-06 4:34

Soundman32.2

11-Jan-06 4:34

I can make any of my MC++ classes have static properties (via the property keyword), but how can I create a property list dynamically at runtime?

Example?

Neil

Re: Dynamically created property

Nish Nishant11-Jan-06 4:36

11-Jan-06 4:36

Neil_Scales wrote:
I can make any of my MC++ classes have static properties (via the property keyword), but how can I create a property list dynamically at runtime?

You cannot alter a class at runtime. You could attempt to dynamically create a new class derived from another class and then instantiate it dynamically at runtime.

Regards,
Nish

RE: Sinh Calculator

Dylan06038811-Jan-06 3:39

Dylan060388

11-Jan-06 3:39

Does anyone have the source code for calulating the hyperbolic sine of an unknown angle, preferable in radian, ( sinh x )?

using the standard library of sine is not allowed.

therefore im stucked at quite beginning.

anyone can help me please?

im doing this for my project.

thank lots... Smile | :)

Re: RE: Sinh Calculator

Nish Nishant11-Jan-06 3:52

11-Jan-06 3:52

You could look at the Standard Library sources, couldn't you? BTW, please be aware that this is the C++/CLI forum.

Regards,
Nish

[C++.NET] Using class of a VC6 and none-MFC DLL

ChocoSoft10-Jan-06 21:56

ChocoSoft

10-Jan-06 21:56

Hello,

Here is my environment:
Visual Studio .NET 2003 Fr
Framework: 1.1 SP1
OS: Win2000 pro SP4

I want to instanciate some class of an older none-MFC DLL which was compiled in C++ 6, from a new C++ .Net application. I have all .h, .lib and .dll files of this library.
My goal is to create a wrapper of this DLL in C++.NET in order to use it in a C# project.
Is it possible to make such wrapper ? and what is the right way to do it ?

Thanks for your answer.

PS : Sorry for my English, I'm french Wink | ;-)

Re: [C++.NET] Using class of a VC6 and none-MFC DLL

Nish Nishant11-Jan-06 3:50

11-Jan-06 3:50

Yes, what you intend to do is very much possible. I assume you have a DLL that exports some native C++ classes. You can write a C++/CLI mixed-mode DLL, that contains managed classes that wrap these native classes. Accessing the native DLL from the mixed-mode DLL is the same as how you would have done it in the pre-.NET days. Go ahead and try it out. You can post any issues you run into on this forum.

Regards,
Nish

Re: [C++.NET] Using class of a VC6 and none-MFC DLL

ChocoSoft12-Jan-06 3:15

ChocoSoft

12-Jan-06 3:15

Thanks for your support Smile | :)

After some tries, I sill got a problem at built time and I think it's a big one.
I think it's due to my native DLL which is compiled with STLport and ZThread Libraries Frown | :-(

Here is the summary of what I've done :
I made a .net class library project. I added the good .lib and lib path in the link tab, the good include path in C++ tab, the good #include in my '.h' and click generate the soluce.
And .net said to me:

<br />
E:\Library\STLport-4.5.3\stlport\stl\_string.c(337): error C2143: erreur de syntaxe : absence de ';' avant '_STL::basic_string<_CharT,_Traits,_Alloc>::find'<br />

In english, it looks like this (I think):

<br />
E:\Library\STLport-4.5.3\stlport\stl\_string.c(337): error C2143: syntax error: no ';' found before '_STL::basic_string<_CharT,_Traits,_Alloc>::find'<br />

This error corresponds to the following code in the file "_string.c" of the STL:

<br />
template <class _CharT, class _Traits, class _Alloc> __size_type__<br />
basic_string<_CharT,_Traits,_Alloc> ::find(const _CharT* __s, size_type __pos, size_type __n) const <br />
{<br />
  if (__pos + __n > size())<br />
    return npos;<br />
  else {<br />
    const const_pointer __result =<br />
      _STLP_STD::search((const _CharT*)this->_M_start + __pos, (const _CharT*)this->_M_finish, <br />
			__s, __s + __n, _Eq_traits<_Traits>());<br />
    return __result != this->_M_finish ? __result - this->_M_start : npos;<br />
  }<br />
}<br />

If you have an idea of how can I solve this problem, I take it !!
Else I will continue to burn some candles at my village's church :-p
C U.

Re: [C++.NET] Using class of a VC6 and none-MFC DLL

Nish Nishant12-Jan-06 3:31

12-Jan-06 3:31

I presume you are using VC++ 2005, which is pretty strict as a compiler. My guess is that your STLport library is not compatible with the new compiler. To test that out, create a regular C++ project (unmanaged native) and try and see if you can compile STLport. Chances are good that it will fail.

Regards,
Nish

Re: [C++.NET] Using class of a VC6 and none-MFC DLL

toxcct12-Jan-06 3:46

toxcct

12-Jan-06 3:46

Nishant Sivakumar wrote:
I presume you are using VC++ 2005

wrong

his first post says :
" Here is my environment:
" Visual Studio .NET 2003 Fr

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

Re: [C++.NET] Using class of a VC6 and none-MFC DLL

Nish Nishant12-Jan-06 4:44

12-Jan-06 4:44

toxcct wrote:
wrong
his first post says :
" Here is my environment:
" Visual Studio .NET 2003 Fr

Oops

In any case, he still needs to try STLPort with a native project before he tries it with a /clr project.

Regards,
Nish

Re: [C++.NET] Using class of a VC6 and none-MFC DLL

ChocoSoft12-Jan-06 4:49

ChocoSoft

12-Jan-06 4:49

Yes, it fails with the same error.

So, no matter, I found another way to reach my goal.
I'm writing a vc6 DLL which uses the classes of my native DLL. This new DLL exports only methods.
And after, I will create a static class in my C# project and use [DllImport(...)] for each method. I think it's the better way, if we consider that it will take too much time to rewrite the whole native DLL in C++.Net.

Thanks for your help,
ChocoS.

Re: [C++.NET] Using class of a VC6 and none-MFC DLL

Nish Nishant12-Jan-06 6:36

12-Jan-06 6:36

Yep, your solution sounds good to me.

Regards,
Nish

Text Databasing

LightWolf19879-Jan-06 17:46

LightWolf1987

9-Jan-06 17:46

Hi-
||I use Dev-C++||
Im still a beginner in C++, and I need to integrate text file database into my program. How do I create that database (I would prefer to use notepad), and what is the syntax of the C++ code to do this? Make this as simple as possible because I am a beginner. Thankyou for your help!

toxcct9-Jan-06 21:58

toxcct

9-Jan-06 21:58

2 things :

1. read this note[^].
2. see Carlos antolini's ADO set of classes[^].

[edit]
i came back to you post and saw that you you're talking about notepad as a database... WTF | :WTF:

notepad is a text editor !!! a database such as SQL server or Oracle is far from being an easy thing to implement, but can be used quite easily.
if you know SQL, consider using such a DB. otherwise, using simple files to store your datas will need you to make a little reflection time about the files formatting, etc...
[/edit]

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

-- modified at 5:09 Tuesday 10th January, 2006

Nish Nishant10-Jan-06 3:50

10-Jan-06 3:50

toxcct wrote:
[edit]
i came back to you post and saw that you you're talking about notepad as a database... notepad is a text editor !!!

I think he wants to use notepad to create his text-based database (such as an XML file).

Regards,
Nish

Nish Nishant10-Jan-06 3:49

10-Jan-06 3:49

You should look at the XML classes available in the .NET f/w.

Regards,
Nish

program wont enter main() until character input is given

Curtis Schlak.10-Jan-06 4:52

Curtis Schlak.

10-Jan-06 4:52

I think that you should read Chapter 5: Data File Metaformats[^] of The Art of Unix Programming[^]. Trust me, it applies to Windows, too. It won't give you the code; however, if you know how to open a file and read its contents, a standard format will help and this can help you choose a format.

I, too, use Dev-C++. I just wish it had support for Objective C.

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

maladuk9-Jan-06 8:08

maladuk

9-Jan-06 8:08

Hello!

I have made a tiny change to a console-application I've been using for years. I changed some variables of type 'unsigned long' into '_int64' to be able to represent larger numbers. As a result the application now halts before execution even enters the main() function. Only after I give a character input and then hits return does the program start its normal execution. This is inconvienient since the program is normally run as a child of another application.

Any ideas about how to fix this?

Thanks in advance!!!

maladuk Sniff | :^)

Re: program wont enter main() until character input is given

Nish Nishant9-Jan-06 11:35

9-Jan-06 11:35

Do you have any global objects?

Regards,
Nish