Managed C++/CLI

9-Jul-07 8:51

This doesn't look like a managed C++ question so you should post it on the Visual C++/MFC board.

I took a look at the site - It appears to be a c++ library so the author probably includes
header file(s) to use in your source code and lib file(s) to link with your project.

The author also appears to be a CPian, so if you go to the article(s) that he wrote about the
library, you can leave a message for him directly. See here[^] for an example.

Mark

Mark Salsbery
Microsoft MVP - Visual C++

This episode brought to you by the letter Z

Re: CxImage library

Bieras9-Jul-07 10:59

Bieras

9-Jul-07 10:59

Thank you for answer Mark Smile | :)

,
but that was not exactly what I asked about. I have already read this article, but I don't understand if I have to Built given .cpp files one by one and then add them to my project or make one library file? And one more. Should I built all the files in the library or only that which contains information of the kind of

// To add a file to the library use the Project menu 'Add to Project'
and with header
#define Library
at the end ?

Bieras

PS. Sorry for my poor English, and for my questions but I'm just the beginner in that kind of programming. Smile | :)

Re: CxImage library

Mark Salsbery9-Jul-07 11:10

What's the equivalent to C# static classes?

9-Jul-07 11:10

There's a section in the article I linked to that explains it better than I ever could (I didn't write the library Smile | :)

) - "Using CxImage in your projects".

It looks like you need to build the libraries (with the supplied workspace/projects) and then
link to the resulting libraries.

Mark

Mark Salsbery
Microsoft MVP - Visual C++

This episode brought to you by the letter Z

mid=57417-Jul-07 6:36

mid=5741

7-Jul-07 6:36

Is it possible to define static classes as in C#? If not, is the following sufficient:

public ref class MyStaticClass
{
public:

   /* a bunch of static methods */

private:

   MyStaticClass() {};
   ~MyStaticClass() {};
   MyStaticClass( const MyStaticClass% ) {};
};

If I enable code analysis, I get warnings on the copy constructor and the destructor:

warning: CA1811 : Microsoft.Performance : 'MyStaticClass.MyStaticClass(MyStaticClass)' appears to have no upstream public or protected callers.
warning: CA1801 : Microsoft.Usage : Parameter '' of MyStaticClass.MyStaticClass(MyStaticClass) is never used. Remove the parameter or use it in the method body.
warning: CA1822 : Microsoft.Performance : The 'this' parameter (or 'Me' in VB) of MyStaticClass.~MyStaticClass():Void is never used. Mark the member as static (or Shared in VB) or use 'this'/'Me' in the method body or at least one property accessor, if appropriate.

Mark Salsbery7-Jul-07 7:27

7-Jul-07 7:27

You can't declare the class static but yes, static methods and member variables will give the
same behavior.

Mark

Mark Salsbery
Microsoft MVP - Visual C++

This episode brought to you by the letter N

mid=57417-Jul-07 7:34

mid=5741

7-Jul-07 7:34

I also want to ensure that MyStaticClass cannot be instantiated. Do you think I should make the class sealed in addition to what I've listed above? And do I need to worry about operator=()?

Mark Salsbery7-Jul-07 8:04

7-Jul-07 8:04

sealed is good to ensure no derived classes.

Off the top of my head, I'd say just having a private default constructor is sufficient.
Without being able to instantiate any objects of the class, the destructor, assignment operator,
and copy constructor are irrelevant.

If, after some more caffeine, I change my mind about that, I'll let you know Smile | :)

Mark

This episode brought to you by the letter N

mid=57417-Jul-07 8:08

mid=5741

7-Jul-07 8:08

OK. Thanks for the input. This is what I'm going with:

public ref class MyStaticClass sealed
{
public:

   /* a bunch of static properties and methods */

private:

   MyStaticClass() {};
};

Mark Salsbery7-Jul-07 9:07

unresolved external symbol error when using template function

7-Jul-07 9:07

That looks like a static class to me Smile | :)

Cheers,
Mark

This episode brought to you by the letter N

patrick.steal7-Jul-07 1:40

patrick.steal

7-Jul-07 1:40

Hi

I am trying to make a detour wrapper class and so i have created some template functions and classes. These are the classes(in simplified form):

Header File:

<br />
#ifndef DETOUREME_H<br />
#define DETOUREME_H<br />
<br />
#include "..\..\..\stdafx.h"<br />
<br />
HRESULT WINAPI somefunction( void );<br />
<br />
class DetourWrapper<br />
{<br />
public:<br />
	DetourWrapper(void){};<br />
	~DetourWrapper(void){};<br />
<br />
	template<typename H> BOOL isDetoured ( H* pClass, int iType );<br />
};<br />
<br />
class DetourThis<br />
{<br />
public:<br />
	DetourThis(){};<br />
	~DetourThis(){};<br />
<br />
	virtual BOOL isDetoured( void ){ return TRUE; };<br />
};<br />
<br />
extern DetourWrapper g_pDW;<br />
extern DetourThis *d_pDT;<br />
<br />
#endif

CPP File:

<br />
#include "Debug.h"<br />
<br />
extern DetourWrapper g_pDW;<br />
extern DetourThis *d_pDT = NULL;<br />
<br />
template<typename H> BOOL DetourWrapper::isDetoured ( H* pClass, int iType )<br />
{<br />
	return pClass->isDetoured();<br />
}<br />
<br />
HRESULT WINAPI somefunction( void )<br />
{<br />
	d_pDT = new DetourThis;<br />
	BOOL enabled = g_pDW.isDetoured(d_pDT, 2);<br />
}

Error:

Linking...<br />
Debug.obj : error LNK2001: unresolved external symbol "class DetourWrapper g_pDW" (?g_pDW@@3VDetourWrapper@@A)<br />
C:\Documents and Settings\Steal.Patrick\My Documents\Visual Studio 2005\Projects\Detours\Release\Detour.dll : fatal error LNK1120: 1 unresolved externals

Can someone please tell me what i am doing wrong here?

Thanks

C++/CLI

Subodh Borker7-Jul-07 1:15

Subodh Borker

7-Jul-07 1:15

I have linked my C/C++ static libraries compiled in VS2005 to my C++/CLI interop project, I want to use C++/CLI interop to export this functionality to C# client.

If i put a call to any static lib function in this interop project, The Interop project compiles properly but gives runtime error

---------------------------
Microsoft Visual C++ Debug Library
---------------------------
Debug Assertion Failed!

Program: ...
File: dbgheap.c
Line: 1473

Expression: _CrtIsValidHeapPointer(pUserData)

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.

(Press Retry to debug the application)
---------------------------
Abort Retry Ignore
---------------------------

Do I need to initialize CRT or somthing in the interop project

If i use a test static lib (static lib created for testing purpose by me) everything works fine, problem occurs when I link my products static libraries and try to call a function from these static lib in my interop project

Subodh Borker

Re: C++/CLI

Bartosz Bien13-Jul-07 6:57

Bartosz Bien

13-Jul-07 6:57

Hello Subodh,

One clean solution would be to wrap your static library into the regular DLL, which can then be used within the CLI project.

Regards,
BB
http://spin.bartoszbien.com

To add fields on a table

mikobi6-Jul-07 21:47

mikobi

6-Jul-07 21:47

I am using Visual c++. Net 2005 with sql server 2000 database.

If I change or add new fields in tables; who can I refresh my Dataset object

Re: To add fields on a table

Christian Graus7-Jul-07 1:18

!declared to have 'C' linkage [modified]

7-Jul-07 1:18

By doing a request for data from the DB, again.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

abbd6-Jul-07 0:14

abbd

6-Jul-07 0:14

Bonjour,

i introduce a laibrairie in my project, whene i compile there are error :
D:\Program Files\Microsoft Visual Studio 8VC\PlatformSDK\include\wspiapi.h : (44)error C2894: templates cannot be declared to have 'C' linkage

please help me to resolve this pb.

Thank you verry mutch

Re: !declared to have 'C' linkage

Christian Graus6-Jul-07 0:33

Re: To refresh DataSource

6-Jul-07 0:33

Doesn't look like a CLI question to me, have you tried the visual C++ forum ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

To refresh DataSource

mikobi4-Jul-07 23:22

mikobi

4-Jul-07 23:22

In my form a have one datagridView to show all data from my table. And I have textboxes from where I changed data on my table when I click on a button "save".

Now I want those changes can be shown immediately on my datagridView without leaving the form and return.

What can I do so to refresh datagridview datasource programmaticcaly .

Paul Conrad12-Jul-07 18:00

Paul Conrad

12-Jul-07 18:00

I think there is a Refresh method you can call.

"I've seen more information on a frickin' sticky note!" - Dave Kreskowiak

Re: To refresh DataSource

mikobi13-Jul-07 2:30

mikobi

13-Jul-07 2:30

Refresh don't working

The solution is to bind again datasource

Help reading vector name from file

empaleador4-Jul-07 14:52

empaleador

4-Jul-07 14:52

Hi
is it possible to declare a vector with a name that we read from a file or cin?

thanks

Christian Graus4-Jul-07 15:07

4-Jul-07 15:07

I think you're in the wrong forum, you're asking about standard C++ stuff, not .NET. Either way, the answer is no. You can't make a variable name dynamic, and why on earth would you ? You can create a map of strings to vectors, and name them that way.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

empaleador4-Jul-07 16:00

empaleador

4-Jul-07 16:00

yes i think i m in the wrong place...

What do you mean with you can create a map of strings to vectors, and name them that way.

thanks

Christian Graus4-Jul-07 17:16

4-Jul-07 17:16

map<string, vector<myType> > myTypes;

myTypes["fish"] // reference a myType named fish

Not sure if you need to use pointers to make it initialise, or not. Long time since I did this in C++

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )