topic Re: Will HostApplicationServices return the correct instance of AutoCAD? in .NET Forum

Will HostApplicationServices return the correct instance of AutoCAD?

soonhui — Fri, 05 Dec 2025 07:28:21 GMT

From the help it says that

The HostApplicationServices class provides various services to host applications at runtime.

I guess that means that if I have multiple ACAD/C3D version installed, then the HostApplicationServices will return the registry key sets differently, depending on which version that is currently running? It does seem that way, but I need to be sure.

Re: Will HostApplicationServices return the correct instance of AutoCAD?

daniel_cadext — Fri, 05 Dec 2025 09:03:47 GMT

I use it to load ARX modules in vanilla , hasn’t failed yet

static void loadDBXModules() { const int version = acdbHostApplicationServices()->releaseMajorVersion(); const auto acismobj = std::format(_T("acismobj{}.dbx"), version); const auto acMPolygonObj = std::format(_T("AcMPolygonObj{}.dbx"), version); if (const auto result = acrxLoadModule(acismobj.c_str(), false, false); !result) acutPrintf(_T("Failed to load %ls: "), acismobj.c_str()); if (const auto result = acrxLoadModule(acMPolygonObj.c_str(), false, false); !result) acutPrintf(_T("Failed to load %ls: "), acMPolygonObj.c_str()); }

Re: Will HostApplicationServices return the correct instance of AutoCAD?

soonhui — Fri, 05 Dec 2025 09:05:54 GMT

@daniel_cadext , but this is not .Net though.

Re: Will HostApplicationServices return the correct instance of AutoCAD?

ActivistInvestor — Fri, 05 Dec 2025 09:13:30 GMT

Yes, it returns the registry keys for the executing product. It doesn't know anything about any other installed products other than the one that is running.

Re: Will HostApplicationServices return the correct instance of AutoCAD?

daniel_cadext — Fri, 05 Dec 2025 09:42:01 GMT

@soonhui .NET is a wrapper around ARX