[ruby-core:45731] [ruby-trunk - Feature #6613][Open] VT_RECORD, IRecordInfo Support in WIN32OLE

Issue #6613 has been reported by dsisnero (Dominic Sisneros).

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Feature #6613: VT_RECORD, IRecordInfo Support in WIN32OLE
https://bugs.ruby-lang.org/issues/6613

Author: dsisnero (Dominic Sisneros)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


WIN32OLE has no support for VT_RECORD VARIANTS.  Python and Perl use the
functions GetRecordInfoFromTypeInfo and GetRecordInfoFromGuids to add
support for VT_RECORD and the IRecordInfo interface.

suggest having a class IRecordInfo and support for generating a Class 
for the UDT to use this Record/Struct in ruby

The method starting on 1395 needs a case statement for VT_RECORD and a way to turn that into a IRECORD class

static void *
get_ptr_of_variant(VARIANT *pvar)
{
    switch(V_VT(pvar)) {
    case VT_UI1:
        return &V_UI1(pvar);
        break;


The IDL definitions for the methods are as follows

HRESULT GetRecordInfoFromTypeInfo(
  __in   ITypeInfo *pTypeInfo,
  __out  IRecordInfo **ppRecInfo
);

HRESULT GetRecordInfoFromGuids(
  __in   REFGUID rGuidTypeLib,
  __in   ULONG uVerMajor,
  __in   ULONG uVerMinor,
  __in   LCID lcid,
  __in   REFGUID rGuidTypeInfo,
  __out  IRecordInfo **ppRecInfo
);

here is the CTYPES definition for python that adds this support

class IRecordInfo(IUnknown):
    # C:/vc98/include/OAIDL.H 5974
    _iid_ = GUID("{0000002F-0000-0000-C000-000000000046}")

    def GetFieldNames(self, *args):
        count = c_ulong()
        self.__com_GetFieldNames(count, None)
        array = (BSTR * count.value)()
        self.__com_GetFieldNames(count, array)
        result = array[:]
        # XXX Should SysFreeString the array contents. How to?
        return result

IRecordInfo. _methods_ = [
        COMMETHOD([], HRESULT, 'RecordInit',
                  (['in'], c_void_p, 'pvNew')),
        COMMETHOD([], HRESULT, 'RecordClear',
                  (['in'], c_void_p, 'pvExisting')),
        COMMETHOD([], HRESULT, 'RecordCopy',
                  (['in'], c_void_p, 'pvExisting'),
                  (['in'], c_void_p, 'pvNew')),
        COMMETHOD([], HRESULT, 'GetGuid',
                  (['out'], POINTER(GUID), 'pguid')),
        COMMETHOD([], HRESULT, 'GetName',
                  (['out'], POINTER(BSTR), 'pbstrName')),
        COMMETHOD([], HRESULT, 'GetSize',
                  (['out'], POINTER(c_ulong), 'pcbSize')),
        COMMETHOD([], HRESULT, 'GetTypeInfo',
                  (['out'], POINTER(POINTER(ITypeInfo)), 'ppTypeInfo')),
        COMMETHOD([], HRESULT, 'GetField',
                  (['in'], c_void_p, 'pvData'),
                  (['in'], c_wchar_p, 'szFieldName'),
                  (['out'], POINTER(VARIANT), 'pvarField')),
        COMMETHOD([], HRESULT, 'GetFieldNoCopy',
                  (['in'], c_void_p, 'pvData'),
                  (['in'], c_wchar_p, 'szFieldName'),
                  (['out'], POINTER(VARIANT), 'pvarField'),
                  (['out'], POINTER(c_void_p), 'ppvDataCArray')),
        COMMETHOD([], HRESULT, 'PutField',
                  (['in'], c_ulong, 'wFlags'),
                  (['in'], c_void_p, 'pvData'),
                  (['in'], c_wchar_p, 'szFieldName'),
                  (['in'], POINTER(VARIANT), 'pvarField')),
        COMMETHOD([], HRESULT, 'PutFieldNoCopy',
                  (['in'], c_ulong, 'wFlags'),
                  (['in'], c_void_p, 'pvData'),
                  (['in'], c_wchar_p, 'szFieldName'),
                  (['in'], POINTER(VARIANT), 'pvarField')),
        COMMETHOD([], HRESULT, 'GetFieldNames',
                  (['in', 'out'], POINTER(c_ulong), 'pcNames'),
                  (['in'], POINTER(BSTR), 'rgBstrNames')),
        COMMETHOD([], BOOL, 'IsMatchingType',
                  (['in'], POINTER(IRecordInfo))),
        COMMETHOD([], HRESULT, 'RecordCreate'),
        COMMETHOD([], HRESULT, 'RecordCreateCopy',
                  (['in'], c_void_p, 'pvSource'),
                  (['out'], POINTER(c_void_p), 'ppvDest')),
        COMMETHOD([], HRESULT, 'RecordDestroy',
                  (['in'], c_void_p, 'pvRecord'))]



################################################################
# functions
_oleaut32 = oledll.oleaut32

def GetRecordInfoFromTypeInfo(tinfo):
    "Return an IRecordInfo pointer to the UDT described in tinfo"
    ri = POINTER(IRecordInfo)()
    _oleaut32.GetRecordInfoFromTypeInfo(tinfo, byref(ri))
    return ri

def GetRecordInfoFromGuids(rGuidTypeLib, verMajor, verMinor, lcid,
rGuidTypeInfo):
    ri = POINTER(IRecordInfo)()
    _oleaut32.GetRecordInfoFromGuids(byref(GUID(rGuidTypeLib)),
                                     verMajor, verMinor, lcid,
                                     byref(GUID(rGuidTypeInfo)),
                                     byref(ri))
    return ri


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