If I use a Type Library (.tlb) in a VB6 project, do I need to distribute it with the .exe?

If I make use of a Type Library in a VB6 project do I need to distribute the .tlb file (and perhaps even re开发者_运维百科gister it?) with the compiled exe on the target computer?

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No, usually it is only needed if you actually call code that attempts to use the types from the type library. I have found some exceptions, involving using types from the type library to dimension variables. I think it was something like this...

Supposing the type library defines a structure A, and your app contains a procedure like this. If the type library is not registered your app cannot start - an error message is displayed.

Sub testSub1(ByRef mybadarray() As A)

but this would be OK

Sub testSub2()
  Dim ok As A ' OK provided you never actually Call testSub2 at runtime '

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In my experience, I always distribute .TLB file along with .EXE including registration, it helped me to prevent the multiple run-time errors like "Run-time error '429': ActiveX component can't create object".

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No you don't. It's only used at compile time.

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Only if you are using multi-threading, i.e. ActiveX EXEs or in-proc with CoMarshalInterThreadInterfaceInStream etc. functions.