got error while trying to execute RFC API from C# .NET

[Former Member]

Hello,

I got following error while trying to execute RFC API "RfcCallReceive" from C# .NET

Error : Method's type signature is not Interop compatible

Anybody know what's a problem?

Jigar

[Former Member]

Hi Jigar,

how are you doing ?

can you please expand your description of the error:

the scenario in which it occurred ?

what is the requirement you are trying to fulfill with this piece of code, etc ...

currently it looks like that there could be a SOAP issue with the method invocation, or it could also be the proxy itself .

with respect,

amit

[Former Member]

Can you tell me how can i declare RfcCallReceive API in C#?

[Former Member]

Sorry for previous post.

I have declared RfcCallReceive in C# as follow:

[DllImport("librfc32.dll", SetLastError=false)]

[SuppressUnmanagedCodeSecurity]

internal static extern int RfcCallReceive(int handle, [MarshalAs(UnmanagedType.LPStr)] string function, [MarshalAs(UnmanagedType.LPArray)] RFC_PARAMETER[] exporting, [MarshalAs(UnmanagedType.LPArray)] ref RFC_PARAMETER[] importing, [MarshalAs(UnmanagedType.LPArray)] ref RFC_TABLE[] tables, [MarshalAs(UnmanagedType.LPStr)] ref string exception);

but still i got error "Object reference not set to an instance of an object."

actually i want to run any BAPI using RFC API. so that'swhy i have to first create Parameters and Tables object and pass it to RFC API. but got continuous error.

[Former Member]

The error message 'Object reference not set to an instance of an object' occurs when the exact definiteion is not found on the server side

dependancies :-

1> r/3 permissions for the particular user on that object

2> client number

3> permissions on inherent dependancies

i cannot verify the definition itself, that you will need to check up on.

try a test user with the role permissions of 'sapall' just to check if this is the case.

then retrace to find where the permissions are not in place.

with respect,

amit

[Former Member]

Thanks amit

Now my RfCallReceive API run, i am not getting any error while execute this API, but after this API execute, my imports and tables parameter gone to be blank. now what's a problem?

[Former Member]

Hi Jigar,

how are you doing ?

glad to help out )

when your import parameters & tables go blank [are cleared], it usually means that they were not populated and saved.

after adding the rows to the tables you need to call the function to save the values to the objects

standard [of type : string, int, etc...] import values do not need to be explicitly saved though

it could just be a usage problem, if not let me know will try to find another solution...

with respect,

amit

[Former Member]

Hi, JIgar, What is the cause to you use de RfcCallReceive unsafe function from C#.

In easier and more secure use the SAP.Connector C# APIS, i the warapper to libRFC32 apisIf do you want C# code exaple , please single it must ask for it to me.

Regards

Sergio.