Run DLL in C++ from Labview

[capsim]

Hi the world !

Ive got a pb in labview when I call my DLL or in VB6 when I build my DLL.

Join my project... what do you think about my pb ?

thanks for help !

Ben.

[parthabe]

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capsim wrote:

Join my project...

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How much are you ready to pay me by hour, if I join your project... ?!

[capsim]

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parthabe a écrit:

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capsim wrote:

Join my project...

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How much are you ready to pay me by hour, if I join your project... ?!

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How much time do you spend on my problem?

 ;))

and do you find my errors?

Ben.

[candidus]

Your C++ code looks a little bit strange to me:

I hope that you allocated the arrays you give to dllbeta1() via C++ operator new[].

I f you didn't, anything will fail. The error message you posted looks like that's the problem.

[capsim]

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candidus a écrit:

Your C++ code looks a little bit strange to me:

I hope that you allocated the arrays you give to dllbeta1() via C++ operator new[].

I f you didn't, anything will fail. The error message you posted looks like that's the problem.

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Yes my C++ code is Strange...like me in C++ !

but I've been adding :

char * var = new char[];

...

delete [] var; 

but... it's the same pb... 😞

help// plzzz ...

[capsim]

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candidus a écrit:

Your C++ code looks a little bit strange to me:

I hope that you allocated the arrays you give to dllbeta1() via C++ operator new[].

I f you didn't, anything will fail. The error message you posted looks like that's the problem.

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Gift ! 😉

[candidus]

I'm confused... Seems that you're calling a DLL written in C++ from C++,

else you couldn't use new[] from the caller's side... How is your problem related to LabVIEW???

[capsim]

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candidus a écrit:

I'm confused... Seems that you're calling a DLL written in C++ from C++,

else you couldn't use new[] from the caller's side... How is your problem related to LabVIEW???

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2d gift from labview ! 😉

[candidus]

OK, I got your gift 🙂

It's pretty useless to use new[] inside your function, static arrays will do it.

The question is, how does your caller allocate the arrays?

It's a bad idea to use operator delete[] on arrays you given as parameters:
You should allocate them, call you dllbeta1() function which shouldn't modify these parameters
and deallocate them in your caller function.

I can't look into your VI, I don't have 8.6 but since we're in a LabVIEW forum

I assume you want to call your DLL from LabVIEW.

LabVIEW has its own memory management
which doesn't just use new[]/delete[] so you shouldn't modify strings in your DLL unless
you're familiar with the memory management functions in "extcode.h".

And be careful to use the right calling convention: __cdecl or __stdcall

[capsim]

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candidus a écrit:

OK, I got your gift 🙂

It's pretty useless to use new[] inside your function, static arrays will do it.

The question is, how does your caller allocate the arrays?

It's a bad idea to use operator delete[] on arrays you given as parameters:
You should allocate them, call you dllbeta1() function which shouldn't modify these parameters
and deallocate them in your caller function.

I can't look into your VI, I don't have 8.6 but since we're in a LabVIEW forum

I assume you want to call your DLL from LabVIEW.

LabVIEW has its own memory management
which doesn't just use new[]/delete[] so you shouldn't modify strings in your DLL unless
you're familiar with the memory management functions in "extcode.h".

And be careful to use the right calling convention: __cdecl or __stdcall

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Calling convention is __cdecl.

My dll doesn't modify these parameters... just uses for functions.

Have you got a solution for me ? 😉

thanks