xsharp.eu

Posted: **Mon Aug 07, 2017 1:22 pm**

I am looking at using XSharp to convert a DLL written in VO (2.6), which uses DBF files with NTX indexes, using DBUseArea() and DBSetIndex(). I have got a clean build, and if I call it from a simple X# test application it works fine, but if I call it from a similar C# application, the DLL opens the DBF file OK but fails to set the index. The index expression is a simple concatenation of three string fields. The error is:

Vulcan.NET Runtime Error
Error Code: 7 [Syntax error]
Error Subcode: 1022 [Expression for macro compiler is invalid]
Filename: "DBFNTX.Compile"
Subsystem: DBFNTX
Function: ORDLISTADD
Call Stack:
at Vulcan.Error.Throw(__Usual[] $args)
at VulcanRTFuncs.Functions.DefError(Error oError)
at VulcanRTFuncs.Functions.DoError(String nSymFunc, __Usual nTries)
at VulcanRTFuncs.Functions.DoError(String nSymFunc)
at VulcanRTFuncs.Functions.OrdListAdd(__Usual[] $args)
at VulcanRTFuncs.Functions.DBSetIndex(__Usual[] $args)
at XSharpTestLib.TestDBF.Open(__Usual[] Xs$Args) in C:XSharp TestXTestLibXSharpTestLibXSharpTestLibTestDBF.prg:line 21

I have found that the same error happens if the X# test application has its dialect set to Core, even if the DLL’s dialect is set to VO. Is there any way this DLL can be run from a C# application?
Thanks,
Mike.

Posted: **Mon Aug 07, 2017 1:28 pm**

Hi Mike,

X# and Vulcan.NET are making some calls to initialize the runtime. If you are calling the DLL from a C# application, then you need to make this yourself.

Since you already have a Vulcan installation, you can find the basics here:

: vulcaninit.png (8.48 KiB) Viewed 335 times

Basically, in C# you need a code like the following:

Code: Select all

class VulcanLoader
{

void InitVulcan()
{
   System.Reflection.MethodInfo mi = typeof( VulcanLoader).GetMethod( "InitVulcan" );
   Vulcan.Runtime.State.AppModule = mi.Module;
}
}

Wolfgang

Posted: **Tue Aug 08, 2017 7:36 am**

Yes, that worked.
Many thanks,
Mike.

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