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TrackBarControl

An ActiveX control for Visual Basic 6 that allows selecting a value with a slider.

I've developed this ActiveX control in 2006 and did update it on a regular basis until 2016. Currently I have little interest to maintain this project any longer, but I think the code might be of some use to others.

Before you make changes

If you make changes to the code and deploy the binary, keep in mind that ActiveX controls are COM components and therefore should stay binary compatible as long as you don't change the COM object's, i.e. the ActiveX control's public class name and GUIDs. Otherwise people using these components are likely to end up in the famous COM hell.

Dependencies

You will need the Microsoft Windows 10 SDK, ATL, and WTL 10.

Required Change to ATL

Some version of ATL have a bug in AtlIPersistPropertyBag_Load which causes crashes. In the file atlcom.h search for AtlIPersistPropertyBag_Load. Inside the implementation of this function search for HRESULT hr = pPropBag->Read(pMap[i].szDesc, &var, pErrorLog);. Make sure that there is this code before this line: var.pdispVal = NULL;.