Windows 10: Cannot marshal from C# IReflect object to C++ IDispatch

HI,


I am struggling with a problem for some time and I hope I can get some guidance here on the community forums.

The problem is simple:


I have a com interface:


[ComImport]
[Guid"08D7DC4F-40A7-432D-A219-FE5470671DC3"]
[TypeLibTypeTypeLibTypeFlags.FDual TypeLibTypeFlags.FNonExtensible TypeLibTypeFlags.FDispatchable]
public interface IDispatchSupplier
{
[MethodImplMethodImplOptions.InternalCall]
[DispId1610743809]
[return: MarshalAsUnmanagedType.IDispatch]
object GetMyObject[In] [MarshalAsUnmanagedType.BStr] string className;
}


and implemenation of IDispatchSupplier:


[ComVisibletrue]
[ProgId"Test.MyDispatchSupplier"]
public sealed class DispatchSupplier: IDispatchSupplier
{
public object GetMyObjectstring className
{
MyReflectObject reflectObject = new MyReflectObject ;
return reflectObject ;
}
}


and a class that implements IReflect:


[ComVisibletrue, ClassInterfaceClassInterfaceType.None]
public sealed class MyReflectObject : IReflect
{

public MemberInfo[] GetMembersBindingFlags bindingAttr
{
return _membersArray;
}

//.......and so on, IReflect is implemented

}



From C++ I just want to access the ITypeInfoMembers and expecting to have members from IReflect but they are not there


CComPtr<IDispatchSupplier> dispatchSupplier;
if SUCCEEDEDdispatchSupplier.CoCreateInstanceL"Test.MyDispatchSupplier"
{
CComPtr<IDispatch> myDispatchObject;
HRESULT hr = dispatchSupplier->GetMyObjectmicClass, &myDispatchObject;
if SUCCEEDEDhr
{
CComPtr<ITypeInfo> myDispatchObjectTypeInfo;
if SUCCEEDEDmyDispatchObject->GetTypeInfoNULL, NULL, &myDispatchObjectTypeInfo
{
TYPEATTR* spTypeAttr = nullptr;
hr = myDispatchObjectTypeInfo->GetTypeAttr&spTypeAttr;
//unique_ptr<TYPEATTR> aspTypeAttr;
if SUCCEEDEDhr
{
WORD funcsCount = spTypeAttr->cFuncs;
for WORD i = 0; i < funcsCount; i++
{
FUNCDESC* spfuncdesc = nullptr;
UINT temp = i;
hr = myDispatchObjectTypeInfo->GetFuncDesctemp, &spfuncdesc;
//unique_ptr<FUNCDESC> bspfuncdesc;
if SUCCEEDEDhr && spfuncdesc
{
long invId = spfuncdesc->invkind;
// This is the Function Description of the required method.
if invId == INVOKE_FUNC
invId == INVOKE_PROPERTYPUT
invId == INVOKE_PROPERTYPUTREF
invId == INVOKE_PROPERTYGET
{

// Get parameters names
CBSTRVector Names50;
UINT nNames0;
myDispatchObjectTypeInfo->GetNamesspfuncdesc->memid, &Names, 50, &nNames;
nNames = __minnNames, UINTspfuncdesc->cParams + 1;
if nNames < 1
continue;
OutputDebugStringWL"\r\n";
OutputDebugStringW*Names;
}
}
}
}
}
}
}


into output I get com members like:

AddRef

QueryInterface

and so on...


Can you please help me with this?

Thank you.

:)

 

Good book/site for C?

The reason I suggest starting with C++ is that in my experience helping people learn to code, they have a harder time transitioning from a functional language (C) to an object oriented language (C++) than they do if they learn OOP first and wish to go back to functional coding (for whatever reason).

C++ is a superset of C, although not neccessarily a 100% strict one.
You can read the C++ Wiki for information on compatibility and differences between the two.

Anyway, regardless of what you chose, the most important thing is to get going !!

 

No O/C at all

Now with the cpu step up O/C it averages around 55-58c on all cores.

 

Learning to Program C

my suggestion is to learn c first, then expand to c++ or java depending on your project requirements. if you decide to use visual studio (which i strongestly recommend) then you can just create c++ projects and write normal c code