DispGetIDsOfNames Function

Uses type information to convert a set of names to DISPIDs. This is the recommended implementation of IDispatch::GetIDsOfNames.

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HRESULT DispGetIDsOfNames(  
  ITypeInfo*  ptinfo,            
  OLECHAR FAR* FAR*  rgszNames,  
  unsigned int  cNames,          
  DISPID FAR*  rgdispid          
);

ptinfo

Pointer to the type information for an interface. This type information is specific to one interface and language code, so it is not necessary to pass an interface identifier (IID) or LCID to this function.

rgszNames

An array of name strings that can be the same array passed to DispInvoke in the DISPPARAMS structure. If cNames is greater than 1, the first name is interpreted as a method name, and subsequent names are interpreted as parameters to that method.

cNames

The number of elements in rgszNames.

rgdispid

Pointer to an array of DISPIDs to be filled in by this function. The first ID corresponds to the method name. Subsequent IDs are interpreted as parameters to the method.

The return value obtained from the returned HRESULT is one of the following:

Return value

Meaning

S_OK

The interface is supported.

E_INVALIDARG

One of the arguments is invalid.

DISP_E_UNKNOWNNAME

One or more of the given names were not known. The returned array of DISPIDs contains DISPID_UNKNOWN for each entry that corresponds to an unknown name.

Other return codes

Any of the ITypeInfo::Invoke errors can also be returned.

This code from the Lines sample file Points.cpp implements the member function GetIDsOfNames for the CPoints class using DispGetIDsOfNames. This implementation relies on DispGetIdsOfNames to validate input arguments. To help minimize security risks, include code that performs more robust validation of the input arguments.

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STDMETHODIMP
CPoints::GetIDsOfNames(
      REFIID riid,
      char FAR* FAR* rgszNames,
      UINT cNames,
      LCID lcid,
      DISPID FAR* rgdispid)
{
   return DispGetIDsOfNames(m_ptinfo, rgszNames, cNames, rgdispid);
}
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