private static System.Type GetValueTypeFromTypeDesc(System.Windows.Forms.NativeMethods.tagTYPEDESC typeDesc, UnsafeNativeMethods.ITypeInfo typeInfo, object[] typeData, StructCache structCache)
{
IntPtr unionMember;
int hr = 0;
switch (((System.Windows.Forms.NativeMethods.tagVT)typeDesc.vt))
{
case System.Windows.Forms.NativeMethods.tagVT.VT_DISPATCH:
case System.Windows.Forms.NativeMethods.tagVT.VT_UNKNOWN:
typeData[0] = GetGuidForTypeInfo(typeInfo, structCache, null);
return(VTToType((System.Windows.Forms.NativeMethods.tagVT)typeDesc.vt));
case System.Windows.Forms.NativeMethods.tagVT.VT_PTR:
{
System.Windows.Forms.NativeMethods.tagTYPEDESC data = (System.Windows.Forms.NativeMethods.tagTYPEDESC)structCache.GetStruct(typeof(System.Windows.Forms.NativeMethods.tagTYPEDESC));
try
{
try
{
UnsafeNativeMethods.PtrToStructure(typeDesc.unionMember, data);
}
catch
{
data = new System.Windows.Forms.NativeMethods.tagTYPEDESC {
unionMember = (IntPtr)Marshal.ReadInt32(typeDesc.unionMember),
vt = Marshal.ReadInt16(typeDesc.unionMember, 4)
};
}
if (data.vt == 12)
{
return(VTToType((System.Windows.Forms.NativeMethods.tagVT)data.vt));
}
unionMember = data.unionMember;
}
finally
{
structCache.ReleaseStruct(data);
}
break;
}
case System.Windows.Forms.NativeMethods.tagVT.VT_USERDEFINED:
unionMember = typeDesc.unionMember;
break;
default:
return(VTToType((System.Windows.Forms.NativeMethods.tagVT)typeDesc.vt));
}
UnsafeNativeMethods.ITypeInfo pTypeInfo = null;
hr = typeInfo.GetRefTypeInfo(unionMember, ref pTypeInfo);
if (!System.Windows.Forms.NativeMethods.Succeeded(hr))
{
throw new ExternalException(System.Windows.Forms.SR.GetString("TYPEINFOPROCESSORGetRefTypeInfoFailed", new object[] { hr }), hr);
}
try
{
if (pTypeInfo != null)
{
IntPtr zero = IntPtr.Zero;
hr = pTypeInfo.GetTypeAttr(ref zero);
if (!System.Windows.Forms.NativeMethods.Succeeded(hr))
{
throw new ExternalException(System.Windows.Forms.SR.GetString("TYPEINFOPROCESSORGetTypeAttrFailed", new object[] { hr }), hr);
}
System.Windows.Forms.NativeMethods.tagTYPEATTR gtypeattr = (System.Windows.Forms.NativeMethods.tagTYPEATTR)structCache.GetStruct(typeof(System.Windows.Forms.NativeMethods.tagTYPEATTR));
UnsafeNativeMethods.PtrToStructure(zero, gtypeattr);
try
{
Guid g = gtypeattr.guid;
if (!Guid.Empty.Equals(g))
{
typeData[0] = g;
}
switch (gtypeattr.typekind)
{
case 0:
return(ProcessTypeInfoEnum(pTypeInfo, structCache));
case 3:
case 5:
return(VTToType(System.Windows.Forms.NativeMethods.tagVT.VT_UNKNOWN));
case 4:
return(VTToType(System.Windows.Forms.NativeMethods.tagVT.VT_DISPATCH));
case 6:
return(GetValueTypeFromTypeDesc(gtypeattr.Get_tdescAlias(), pTypeInfo, typeData, structCache));
}
return(null);
}
finally
{
pTypeInfo.ReleaseTypeAttr(zero);
structCache.ReleaseStruct(gtypeattr);
}
}
}
finally
{
pTypeInfo = null;
}
return(null);
}
