# The return value of the server side object method call with one or more parameters
**URL:** https://discourse.paraview.org/t/the-return-value-of-the-server-side-object-method-call-with-one-or-more-parameters/7389
**Category:** Development
**Created:** [June 10, 2021, 1:56pm UTC](https://discourse.paraview.org/t/the-return-value-of-the-server-side-object-method-call-with-one-or-more-parameters/7389 "2021-06-10T13:56:04Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Petr\_Melnikov](https://discourse.paraview.org/u/Petr_Melnikov)
#### Post date: [June 10, 2021, 1:56pm UTC](https://discourse.paraview.org/t/the-return-value-of-the-server-side-object-method-call-with-one-or-more-parameters/7389/1 "2021-06-10T13:56:05Z")
Dear Experts,
Does paraview provide the way to get the return value of the server side object method call with one or more parameters?
I know about properties with “information\_only” attribute, but this feature is suitable, if I understand correctly, only for methods without parameters. The attribute “number\_of\_elements\_per\_command” does not work in such case.
How can achieve this?
Thanks in Advance!
Petr
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 10, 2021, 2:11pm UTC](https://discourse.paraview.org/t/the-return-value-of-the-server-side-object-method-call-with-one-or-more-parameters/7389/2 "2021-06-10T14:11:22Z")
> [@Petr\_Melnikov](#):
>
> The attribute “number\_of\_elements\_per\_command” does not work in such case.
Correct.
Use a StringVectorProperty with a StringListDomain
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### Author:  [@Petr\_Melnikov](https://discourse.paraview.org/u/Petr_Melnikov)
#### Post date: [June 10, 2021, 3:35pm UTC](https://discourse.paraview.org/t/the-return-value-of-the-server-side-object-method-call-with-one-or-more-parameters/7389/3 "2021-06-10T15:35:09Z")
Hmm, explain, please
For example, an object on the server has two methods:
```
// Adds the given string to the array
void AddString (const char * value);
// Counts the number of added strings that match the regular expression
int GetNumberOfStrings (const char * regExpr);
```
I want to get the result of the second method call on client application using proxy object. How can I do that using proxy properties?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 11, 2021, 6:32am UTC](https://discourse.paraview.org/t/the-return-value-of-the-server-side-object-method-call-with-one-or-more-parameters/7389/4 "2021-06-11T06:32:04Z")
My bad, this was not the correct information.
Just a StringVectorProperty with information\_only should do the trick. You should manage the “number” side of things client side.
see VDFReaderPlugin/Readers/vtkVDFReader::GetPointArrayName for an example.
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### Author:  [@Petr\_Melnikov](https://discourse.paraview.org/u/Petr_Melnikov)
#### Post date: [June 12, 2021, 8:13am UTC](https://discourse.paraview.org/t/the-return-value-of-the-server-side-object-method-call-with-one-or-more-parameters/7389/5 "2021-06-12T08:13:40Z")
Thanks, @mwestphal
The vtkVDFReader::GetPointArrayName method is called using the vtkSIArraySelectionProperty (ArraySelectionInformationHelper) helper class. This class allows to form a list of array names on the server side without passing any additional information.
Having looked at the code for pulling/pushing messages for data exchange, I came to the conclusion that the only way to get the result of calling a method with parameters is to save the parameters on the server (something like a context), and then, using the saved data, call the method without parameters.
PS.
I think it would be useful to add for StringVectorProperty the ability to pass its elements as arguments of remote method call in case of “information\_only” property.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 14, 2021, 10:28am UTC](https://discourse.paraview.org/t/the-return-value-of-the-server-side-object-method-call-with-one-or-more-parameters/7389/6 "2021-06-14T10:28:09Z")
I agree with your PS.