How do I pass a double array from PHP to C#

Question

I have a .net C# function that takes an double array as the first parameter and passes back another double precision array based on the first.

C# Code

public int testMath(double[] InputSet, double[] OutputSet)
{
    // more complicated than what I am showing but
   for (int i = 0; i < 3; i++)
   {
      OutputSet[i] = InputSet[i] * 2.0;
   }
   return 1;  // Really something else
}

PHP

$mathTest = new DOTNET("MathTest,"
        ."Version=1.0.0.0,"
        ."Culture=neutral,"
        ."PublicKeyToken=213536b1e6bb8ea5"
        , "MathTest.MathTest");

$inputValue = Array();
$outputValue = Array();

for ($i = 0; $i < 3; $i++){
  $inputValue[$i] = $i * 3.0;
  $outputValue[$i] = 0.0;
}

$status = $mathTest->testMath($inputValue, $outputValue);

When I try to run this I get an error that parameter 1 is a type mismatch.
I have other routines that take doubles as inputs and by ref outputs that work as I would expect. I can call this routine from other programming languages but I am stumped as to how to get it to work in PHP. I tried viewing the parameters using com_print_typeinfo and found that both arguments show up as VT_SAFEARRAY as IN. I did some testing to change argument 1 to be an OUT and it made it worse (won't run at all). Any suggestions would be greatly appreciated.

Seriously, why does it need to happen in C#? Or the other way round? This seems like a terrible thing to do. — F.P
– F.P, Commented May 24, 2013 at 14:00

yaron · Accepted Answer · 2013-05-24 14:07:23Z

1

the most simple approch imo would be to encode the double array as json.

from php

json_encode ($myarr);

or

  json_decode ($myarr); // if u want the other direction

and then just catch it in the c# (or vice versa) and decode it. u can use json.net or jsonFx etc.

edited May 24, 2013 at 14:07

answered May 24, 2013 at 14:00

yaron

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1 Comment

Bob Canning Over a year ago

Thanks, that worked. I had not use json before so I had to install it on my Visual Studio configuration. After a few misteps I got it to work.

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