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that you cannot control what VB produces For example, there is no way to directly control the marshaling flags on parameters, the packing level on structures, the version of the typelib, or the GUIDs used on the interfaces and classes You need to take a three pronged approach to gain this low-level of control of the typelibs you use in your project and the ones you produce If you want to define types that VB can't describe, you need to write your own typelib If you have explicit requirements (such as existing coclass or interface identifiers that VB needs to know about to match the binary implementation to the typelib description), you need to modify the typelib and other resources in the binary compability file so that VB can reproduce these settings when it recompiles your project Finally, if you need to change settings that only the consumer of your object cares about (such as parameter marshaling information), you need to modify the typelib contained in your executable after VB has finished writing it
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Although VB produces highly standardized typelibs, it can consume a much greater range of functions and interfaces that it can produce It is a common misconception that VB can consume only dual interfaces This is simply not true VB can call nearly any interface, and the number of interfaces that it can't call can be reduced to almost zero by redefining, or "VB-izing," the interface for VB consumption Note that calling an interface falls strictly within the consumption category; implementing an interface with Implements implies that VB both consumes the interface and produces code for it, meaning that the interface requirements for Implements are much stricter than those for calling member functions on an interface There is only a limited set of typelib elements that VB can't handle at all You can work around these limitations if you are willing to write a little extra code or define a VB-ized interface Typelib Elements That VB Can't Use ByVal Arrays in Parameter Lists VB handles only a SAFEARRAY(elementtype)* array (corresponding to a SAFEARRAY** in C + + ) To call this type, redefine it as a ByVal Long and use VarPtrArray combined with VBoostDeref to pass the type With Implements,
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you can work around this limitation by changing the parameter to a ByVal Long and using the SafeArray dereferencing techniques discussed in 2 The ArrayOwner lightweight object is particularly useful in this and other pointer situations ByVal Structures in Parameter Lists ByVal structures in parameter lists are very difficult to work around, but they are also extremely rare If you need to implement a function that receives a ByVal structure, you must provide a series of Long parameters to correctly fill the stack You can use ByVal Long for all parameters and recompose the object four bytes at a time, or you can use a ByRef Long for the parameter that corresponds to the first element in the structure and dereference the VarPtr of the first element into a SAFEARRAY to read the structure You can use a similar process to call a function that takes a ByVal structure Pointer Fields in Structures VB cannot handle structures that contain pointer-type fields (long*, long**, IDispatch**, MyStruct*, and so on) In order to call these types, you must use a Long field and dereference it using VBoostDeref or SafeArray techniques Fields that include native pointer types (objects, strings, variable-size arrays) are also pointer types in structures Unsigned Types VB refuses to use structures that include unsigned long and unsigned short types The one case in which VB does use an unsigned type is with the Byte type, which corresponds to an unsigned char In this case, the signed, one-byte type (char) is not accessible from VB Fortunately, the workaround here is easy, but it often requires a VB-ized library VB can consume an alias to an unsigned type, but not the type itself The ODL line typedef [public] unsigned long ULONG; defines an alias type called ULONG, which you can use in your typelib Simply replace any unsigned long or unsigned short types with aliases and your work is done VB treats an unsigned long as a long in all arithmetic operations, so be sure to use VBoost's unsigned arithmetic functions if you need true unsigned arithmetic You can also skip the alias definition and simply replace unsigned long with long
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