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PRB: Error "Bound to Unknown Type" Inserting ATL Control in VBA UserForm

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This article was previously published under Q214462

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Symptoms

When inserting your ATL control in a Microsoft Office 97 VBA UserForm, you crash in OLEAUT32.DLL, or receive the following error:
Bound to unknown type.

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Cause

This is typically caused by ATL controls that declare enumerated types in their IDL file without specifying a tag.

For example, you may have an enumerated type such as the following in your IDL file: 
   typedef enum {
      myEnumVal1 = 1, myEnumVal2 = 2
   } MyEnum;

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Resolution

To ensure that your type library is suitable for all containers, you should provide a tag for all enumerated types. For example: 
   typedef enum MyEnumTag {
      myEnumVal1 = 1, myEnumVal2 = 2
   } MyEnum;

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References

For additional information, see the following article or articles in the Microsoft Knowledge Base:
181255� How To Implement Enumerated Properties in ATL

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Keywords: kbctrlcreate, kbprb, KB214462

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Article Info
Article ID : 214462
Revision : 6
Created on : 1/24/2007
Published on : 1/24/2007
Exists online : False
Views : 393