C++/CLI parameter type conversion

[vijay.gandhi@gmail.com]

Hello,

I am trying to write a wrapper function in C++/CLI over an existing
function in C++.

For instance, assume the C++ function is:
ComputeMedian(d ouble* x).

To create a C++/CLI wrapper, I created a function in C++/CLI which
looks like:
ComputeMedianIn terface(array<d ouble>^ x).

I want my ComputeMedianIn terface() function to call ComputeMedian()
internally. I somehow want to convert the input values array<double>^x
to double* x so that I do not have to modify the code within
ComputeMedian() .

The only way I could think of is by creating a copy (using malloc so
that I get the pointer) within ComputeMedianIn terface() and then
passing that as an argument to ComputeMedian() .

Is there any better way?

Thanks!
Vijay.

[David Lowndes]

Re: C++/CLI parameter type conversion

>I am trying to write a wrapper function in C++/CLI over an existing

>function in C++.
>
>For instance, assume the C++ function is:
>ComputeMedian( double* x).
>
>To create a C++/CLI wrapper, I created a function in C++/CLI which
>looks like:
>ComputeMedianI nterface(array< double>^ x).
>
>I want my ComputeMedianIn terface() function to call ComputeMedian()
>internally. I somehow want to convert the input values array<double>^x
>to double* x so that I do not have to modify the code within
>ComputeMedian( ).
>
>The only way I could think of is by creating a copy (using malloc so
>that I get the pointer) within ComputeMedianIn terface() and then
>passing that as an argument to ComputeMedian() .
>
>Is there any better way?

Have a look at the pin_ptr documentation.

Dave

[Bruno van Dooren [MVP VC++]]

Re: C++/CLI parameter type conversion

I want my ComputeMedianIn terface() function to call ComputeMedian()

internally. I somehow want to convert the input values array<double>^x
to double* x so that I do not have to modify the code within
ComputeMedian() .
>
The only way I could think of is by creating a copy (using malloc so
that I get the pointer) within ComputeMedianIn terface() and then
passing that as an argument to ComputeMedian() .
>
Is there any better way?

Hi,

You can do that very easily like this:
pin_ptr<doublep = &arr[0];

this will pin the managed array into memory so that it doesn't get moved
around by the GC, and will allow you to access the elements in the managed
array through a native pointer p.

--

Kind regards,
Bruno van Dooren
bruno_nos_pam_v an_dooren@hotma il.com
Remove only "_nos_pam"

[vijay.gandhi@gmail.com]

Re: C++/CLI parameter type conversion

Thanks to you both. I got it working!
Vijay.

On Feb 26, 2:11 am, "Bruno van Dooren [MVP VC++]"
<bruno_nos_pam_ van_doo...@hotm ail.comwrote:

I want my ComputeMedianIn terface() function to call ComputeMedian()
internally. I somehow want to convert the input values array<double>^x
to double* x so that I do not have to modify the code within
ComputeMedian() .

>

The only way I could think of is by creating a copy (using malloc so
that I get the pointer) within ComputeMedianIn terface() and then
passing that as an argument to ComputeMedian() .

>

Is there any better way?

>
Hi,
>
You can do that very easily like this:
pin_ptr<doublep = &arr[0];
>
this will pin the managed array into memory so that it doesn't get moved
around by the GC, and will allow you to access the elements in the managed
array through a native pointer p.
>
--
>
Kind regards,
Bruno van Dooren
bruno_nos_pam_v an_doo...@hotma il.com
Remove only "_nos_pam"