/// <summary>
/// Gets the control <see cref="ComTypes.ITypeInfo"/> by looking for the
/// corresponding getter on the form interface and returning its retval type
/// </summary>
/// <param name="controlName">the name of the control</param>
/// <returns>
/// <see cref="ITypeInfoWrapper"/> representing the type of control,
/// typically the coclass, but this is host dependent
/// </returns>
public static ITypeInfoWrapper GetControlTypeFromInterface(ITypeInfoWrapper rootInterface, string controlName)
{
// TODO should encapsulate handling of raw datatypes
foreach (var func in rootInterface.Funcs)
{
using (func)
{
// Controls are exposed as getters on the interface.
// can either be ControlType* get_ControlName()
// or HRESULT get_ControlName(ControlType** Out)
if ((func.Name == controlName) &&
(func.ProcKind == PROCKIND.PROCKIND_GET) &&
(func.ParamCount == 0) &&
(func.FuncDesc.elemdescFunc.tdesc.vt == (short)VarEnum.VT_PTR))
{
var retValElement = StructHelper.ReadStructureUnsafe <ComTypes.ELEMDESC>(func.FuncDesc.elemdescFunc.tdesc.lpValue);
if (retValElement.tdesc.vt == (short)VarEnum.VT_USERDEFINED)
{
var hr = rootInterface.GetSafeRefTypeInfo((int)retValElement.tdesc.lpValue, out var retVal);
if (ComHelper.HRESULT_FAILED(hr))
{
throw RdMarshal.GetExceptionForHR(hr);
}
return(retVal);
}
}
else if ((func.Name == controlName) &&
(func.ProcKind == PROCKIND.PROCKIND_GET) &&
(func.ParamCount == 1) &&
(func.FuncDesc.elemdescFunc.tdesc.vt == (short)VarEnum.VT_HRESULT))
{
// Get details of the first argument
var retValElementOuterPtr = StructHelper.ReadStructureUnsafe <ComTypes.ELEMDESC>(func.FuncDesc.lprgelemdescParam);
if (retValElementOuterPtr.tdesc.vt == (short)VarEnum.VT_PTR)
{
var retValElementInnerPtr = StructHelper.ReadStructureUnsafe <ComTypes.ELEMDESC>(retValElementOuterPtr.tdesc.lpValue);
if (retValElementInnerPtr.tdesc.vt == (short)VarEnum.VT_PTR)
{
var retValElement = StructHelper.ReadStructureUnsafe <ComTypes.ELEMDESC>(retValElementInnerPtr.tdesc.lpValue);
if (retValElement.tdesc.vt == (short)VarEnum.VT_USERDEFINED)
{
var hr = rootInterface.GetSafeRefTypeInfo((int)retValElement.tdesc.lpValue, out var retVal);
if (ComHelper.HRESULT_FAILED(hr))
{
throw RdMarshal.GetExceptionForHR(hr);
}
return(retVal);
}
}
}
}
}
}
throw new ArgumentException($"TypeInfoWrapper::GetControlType failed. '{controlName}' control not found.");
}