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How do you pass a VBscript array into c# Class method call

Posted on 2006-07-01
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Last Modified: 2008-01-09
I have written a c# class that I use in a VbScript running in windows scripting Host to automate an external application.
It works well and passing simple variables like strings as parameters to methods is Ok

I now want to build an array in Vbscript and pass the array as a parameter to the method

'''''''''''''''''''''''''''''''''''''''''''''''''
e.g. VbScript code
dim strArr(2)
strArr(0) = "01001"
strArr(1) = "01002"

dim obj
set obj = CreateObject("mytest.mytest")
ok = obj.SetMultipleValues("StockCode", strArr)
set obj = nothing
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

The c# code is
public bool SetMultipleValues(string strParamName, string[] strValueArr)
{
  //some code that loops through array
}


The error I get is that VbScript says "Invalid procedure call or argument ...."

experimentation indicates that it is the array that is the problem.
I suspect that the Vbscript array is not really an array as c# would expect

Can anyone help?

Thanks

Andy



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Question by:ieg
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Accepted Solution

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bruintje earned 500 total points
ID: 17023258
Hi ieg,
----------

this is only my assumption but you are correct about the difference in array types

in VBS you have no real types though you name them str its all implicit a variant type thus the array can be anything from C# viewpoint with simple types an implicit conversion goes ok but with complex types not

you could look in the debugger what comes in the C# code when you pass it from VBS

you could look at these 2 possible ways out

1. using a seperated string that you use a split on in C# to get the individual parts
2. using a typecast to a string array in C# but i'm not so sure if its safer then option 1

----------
bruintje
share what you know, learn what you don't
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Author Comment

by:ieg
ID: 17023693
Thanks bruintje,
using TypeName in Vbscript shows me that I have a variant array.
I don't seem to be able to get this into the c# code because I get a Windows scripting Host error
"Variable uses an Automation type not supported in Vbscript"

Am I right in assuming that Vbscript can't pass the array?
In the c# code i have used system.object to try and capture the variant (see below) but I think this is looking more like a restriction in Vbscript than a c# issue.
public bool SetMultipleValues(string strParamName, object strValueArr)

Any thoughts?

Andy

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Expert Comment

by:aaronfeng
ID: 17024051
In your C# code, you can try to take in an object instead string[] then try to cast it to string[].  You might have to play around with the type you need to pass in and cast to.

Cheers,

Aaron
http://geekswithblogs.net/afeng/
0
 
LVL 44

Expert Comment

by:bruintje
ID: 17025847
>>public bool SetMultipleValues(string strParamName, object strValueArr)

yes that's what i meant with option 2, but i'm not sure how a cast to string[] would play out, can you cast an object to string[] in one go?

that's why option 1 using a long string that got split on the C# side is an easier option because you can almost be sure it will work as expected :)
0
 

Author Comment

by:ieg
ID: 17026290
Thanks Brian - I am going to go with your option 1 - it works well.

Andy
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