Managed C++/CLI Discussion Boards

Nish Nishant19-Jan-06 3:56

19-Jan-06 3:56

Uhm, I don't think the issue with the CHM is the same. This may more be a case of broken links. Try running it from another local drive and you may get the same error.

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

running a managed exe via LAN?

IlanTal18-Jan-06 21:13

IlanTal

18-Jan-06 21:13

I have a managed c++ program which gives the following error when run over the network:
'System.Security.Policy.PolicyException'. It then fails to run.
To check the problem I shared a folder on my local machine giving full access rights to everyone.
Then I mapped the same folder back to myself as drive z:.
If I ran the program through the folder directly: no problem.
If I ran the same program through drive z: fails with above error.

I tried running non managed programs through drive z: and they all seem to work.
Is this a lost cause, or is there anything I can do?

Thanks,
Ilan

Re: running a managed exe via LAN?

Nish Nishant19-Jan-06 3:55

Nish Nishant

19-Jan-06 3:55

You may need to make that app a trusted assembly. See Adding Assemblies to Security Policy[^]

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Array of CheckBoxes

Sniper23418-Jan-06 18:49

Sniper234

18-Jan-06 18:49

Hello!

I like to build an array of CheckBoxes in C++ Builder to call it in a for-loop like this:

for (int i = 0; i<10; i++)
{
CheckBox[i]->Checked = false;
}

How can I do this in best way? How can I create the CheckBoxes on the formular and include it in .h-file?

Re: Array of CheckBoxes

toxcct18-Jan-06 21:58

toxcct

18-Jan-06 21:58

firstly, read this[^]

then, you are on a Visual (Microsoft) C++ forum, not a C++ Builder one.

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Free C++ Compiler question

JGHayles18-Jan-06 15:37

JGHayles

18-Jan-06 15:37

Could you please give me some idea on the best C++ compiler available for an Windows XP Pro system? I'd like to do some simple tasks that might include graphics. Thank you.

Re: Free C++ Compiler question

toxcct18-Jan-06 21:49

toxcct

18-Jan-06 21:49

cross-posts are generally not well appreciated!

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Re: Free C++ Compiler question

Nish Nishant19-Jan-06 3:51

Nish Nishant

19-Jan-06 3:51

You could try Visual C++ 2005 Express Edition.

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Calling native C++ function from managed C++ via base class pointer using polymorphism

chervu18-Jan-06 9:05

chervu

18-Jan-06 9:05

Hello,

Is it possible to implement callback from MC++ to Native C++ using polymorphism?
The intention is to hold the pointer to the derived class in baseclass pointer on Managed C++, later to call the virtual function on the base class pointer. Is this possible without using DLLImport?

Thank you & Best Regards, Renuka

Re: Calling native C++ function from managed C++ via base class pointer using polymorphism

Nish Nishant18-Jan-06 10:06

Nish Nishant

18-Jan-06 10:06

You don't need P/Invoke, you need a mixed-mode app or DLL. Polymorphism works the same way irrespective of whether you call it from native code or mixed mode code.

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Re: Calling native C++ function from managed C++ via base class pointer using polymorphism

chervu19-Jan-06 13:07

chervu

19-Jan-06 13:07

Hello,

Thank you for the clarification. I thought of trying this problem in baby steps as mentioned below:

(1) Have a singleton unmanaged class (say X), shared across managed C++ and native C++.
(Please note a big assumption here. I'm not sure whether this makes sense as the heaps of native and managed worlds are handled differently.
(2) Set Derived class instance in X's singleton instance. X stores this instance in a base class pointer.
(3) Call virtual method on this base class pointer for native client derived class implementation to get executed.

But I'm 100% doubtful about step-1. It is because the heaps of native and managed worlds are different.Is this correct? Is there any alternative way to share the instance of a class between native and managed boundaries using IJW? At least can I use GlobalAlloc() to allocate the bytes to share across managed and native worlds?

How does .NET runtime know when to allocate on managed heap and when to allocate on native heap? Does it decide based on the caller (client)?

Thank you & Best Regards

-- modified at 19:07 Thursday 19th January, 2006

Re: Calling native C++ function from managed C++ via base class pointer using polymorphism

Nish Nishant19-Jan-06 13:57

Nish Nishant

19-Jan-06 13:57

Native objects are created on the C++ heap (when you use new) and managed objects are created on the garbage collected CLR heap (when you use gcnew). There's currently no confusion since you can use new only with native objects and gcnew only with managed objects.

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Re: Calling native C++ function from managed C++ via base class pointer using polymorphism

chervu23-Jan-06 11:56

chervu

23-Jan-06 11:56

Hello,

Thank you for the quick response.
I was able to call native overridden virtual function (with no parameters) using polymorphism between Managed and Native C++ via a native DLL (compiled by VC6 compiler). I tried to extend my sample with one managed structure as parameter to the native virtual function. VC6 compiler compiled the sources and generated lib/dll for the new changes successfully.
However, I noticed below compilation error while trying to compile MC++ client using the native header:

error C3383: 'AimAdpCBBase::notify' : in an unmanaged class, a virtual member function cannot have a managed type in the signature

I read the explanation for this in MSDN. And found some articles on google stating this feature is prohibited due to performance overheads with the involved transistions from managed-native-managed. But do you know any alternative to get around this error?

One alternative may be by using gcroot template around the managed type in the native function. This might work with VC7 compiler to generate lib/dll with CLR option. But VC6 compiler doesn't know about gcroot, vcclr.h, mscorlib.dll, /clr option etc.

How to make this work between VC6 compiler and MC++ compiler?

ps:- Another question, Does gcroot support pointer to a managed struct also?

Thank you & Best Regards,

-- modified at 18:47 Monday 23rd January, 2006

String Arrays

hmklakmal18-Jan-06 5:18

hmklakmal

18-Jan-06 5:18

hi;

please tell me how to create a string array
char *p[] do not work;

thanx.

Kanchana

Re: String Arrays

Nish Nishant18-Jan-06 5:28

Nish Nishant

18-Jan-06 5:28

hmklakmal wrote:
please tell me how to create a string array
char *p[] do not work;

array<String^>^ strarr;

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

-- modified at 11:28 Wednesday 18th January, 2006

Re: String Arrays

toxcct18-Jan-06 5:59

toxcct

18-Jan-06 5:59

Nishant Sivakumar wrote:
array<String^>^ strarr;

very intuitive syntax though... Laugh | :laugh:

yeah, i know, i have to read your article about CLI syntax first, otherwise, i'll always stay out of that world.
(actually, i want to make the step, i only want to understand easily the new MS C++/CLI syntax)

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Re: String Arrays

Nish Nishant18-Jan-06 6:55

Nish Nishant

18-Jan-06 6:55

toxcct wrote:
very intuitive syntax though...

Yeah, it can be a tad confusing initially.

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Re: String Arrays HELPPPPPPPPPPPPPPPPPPPPPP

hmklakmal19-Jan-06 13:18

hmklakmal

19-Jan-06 13:18

Dont work that one. Frown | :-(

Kanchana

Re: String Arrays HELPPPPPPPPPPPPPPPPPPPPPP

Nish Nishant19-Jan-06 13:55

Nish Nishant

19-Jan-06 13:55

hmklakmal wrote:
Dont work that one.

How exactly does it not work?

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Please I need help

Saksida Bojan17-Jan-06 10:44

Saksida Bojan

17-Jan-06 10:44

I am programing a database multi-lang application.
I am slovenian so i am using also other character.

StreamReader ^sr = File::OpenText("test.txt");
MessageBox::Show(sr->ReadLine());

In file are these character:
http://i26.photobucket.com/albums/c104/bsaksida/supposted.jpg

but i get:
http://i26.photobucket.com/albums/c104/bsaksida/i_get.jpg

Thanks in advance

Re: Please I need help

Saksida Bojan18-Jan-06 5:17

Saksida Bojan

18-Jan-06 5:17

Found the problem.

StreamReader ^sr = gcnew StreamReader(File::OpenRead("test.txt"), Encoding::Default);

Re: Please I need help

Nish Nishant18-Jan-06 5:31

Nish Nishant

18-Jan-06 5:31

Interesting! I'd have thought, that'd have been the default.

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Re: Please I need help

Saksida Bojan18-Jan-06 5:38

Saksida Bojan

18-Jan-06 5:38

So did i...

I have found this in msdn:
ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.NETDEV.v10.en/passport25/NET_Passport_VBScript_Documentation/Single_Sign_In/Advanced_Single_Sign_In/Localization_and_LCIDs.htm

for slovenian i need to set "windows-1250", but i coudn't find any way to change to this encoding, when i have tried Encoding::Default just for fun. And it worked. I think this encoding chose it self based on windows configuration.

Re: Please I need help

Nish Nishant18-Jan-06 5:55

Nish Nishant

18-Jan-06 5:55

Saksida

I just went through the source (using Reflector). When you don't specify an encoding, it uses UTF8 by default. Hence your problem. Now that makes sense I guess.

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Re: Please I need help

Saksida Bojan18-Jan-06 6:03

Saksida Bojan

18-Jan-06 6:03

I can only specificy (the way i know):
UTF7
UTF8
UTF32
Unicode
ASCII
and of course Default.

but my program requires:
windows-1250

How can i set other encoder like windows-1250 without using default?

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