Reputation: 61

"Error in loading DLL" when compiling DLL in VB6

I have a visual basic 6 ".dll project" that uses references and when "File->Make dll" option is clicked, it should generate a dll file. Well, when clicked "File->Make dll", I get error "Error in loading DLL".

How can I see which references are missing?

Upvotes: 6

Answers (6)

PravyNandas

Reputation: 677

In 2019, got same error on my old xp laptop in a project being migrated from Excel VBA to VB6. I read all above answers and could not solve the issue (No Missing references to start with and there are not many changes done on the default libraries' locations). What actually solved my problem is kind of strange. I double-clicked and opened each and every form and Designer modules (essentially loading it components to memory) and voila, the error is gone its own. I tried to reproduce the error and it does comeback when I launch the IDE once again. Finally figured out, there is one such bulky userform with lot of control is the culprit. I couldn't figure out exactly which control is causing the dll error but for now the job is done.

Upvotes: 0

Étienne Laneville

Reputation: 5031

In Project -> References, double-check the Location of all your references. Your reference might have the right name but could be pointing to another instance of the same DLL.

Upvotes: 0

wqw

Reputation: 11991

I've seen this error occur when referenced components are recompiled with no compatibility but the previous versions of the dlls are not unregistered beforehand, so the registry keys for the typelibs are not removed and these bogus registry entries point to the new dlls.

Usually I deal with these with an internal registry cleaner tool that can remove typelibs/clsid/interfaces registration based on typelib disk location. You can try moving physical files of the referenced projets to different location on disk and regsvr32 them there, manually remove references from the project file, restart the IDE and reopen project, finally add references and check that dll location in add reference dialog points to the new files location.

Upvotes: 2

RS Conley

Reputation: 7196

If you have no MISSING references then try compiling the libraries of the project using project compatibility instead of binary compatibility. VB6 can get confused with Binary compatibility when there are multiple libraries being reference in a hierarchy of libraries.

Upvotes: 1