ActiveX Control in 64 bit windows

Question

For 64bit OS, out C# App will use BeauGague ActiveX Control ( www.beaugauge.com ).

Compile successfully, but display error “HRESULT:0x80040154 (REGDB_E_CLASSNOTREG)” when running. What can I do resolve the problem?

Answer 1

It works in design mode because Visual Studio is a 32-bit program. But not at runtime, in VS2008 and earlier the project is built to target AnyCPU. Which gets you a 64-bit process on a 64-bit version of Windows. Which cannot load ActiveX components that are only available as 32-bit DLLs.

It doesn't look like your vendor has done much lately to keep up with developments. The workaround is simple: right-click your EXE project in the Solution Explorer window, Properties, Compile tab. Change the Platform target setting to x86. Which ensures that your program always runs as a 32-bit process.