'calling convention' conflict in calling fucntions from a com dll

[onlyshiza]

Hi everyone,

I am writing a VC++6.0 client for a com dll(developed in VB6.0). I have a runtime problem calling some functions of the dll, the error message I get is:
"The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention."

Any ideas on how to resolve this calling convention conflicts will be gratefully received. I only have access to the .tlb of the dll.

Regards,
onlyshiza

 

[LazyMe]

Please post the significant code (calling the method) and the tlb information of the method being called.

Greetings,
Rick

 

[onlyshiza]

Thanks for you reply Rick,

Here is the tlb information of the method I am calling:

 [id(0x60030009), helpstring("Retrieve the marker's description from the persistence file and checks the template's validity. If it returns a value other than mtSuccess, an explanation (in English) is contained in the OutCompletionString parameter (if provided).")]
        mtCompletionCode RestoreTemplate(
                        [in] _Persistence* P, 
                        [in, optional, defaultvalue("")] BSTR NameInP, 
                        [in, out, optional] BSTR* OutCompletionString);

Notes: 1) This method belongs to the _Marker inteface of Marker coclass.
2) _Persistence is the default interface of Persistence coclass
3) mtCompletionCode is an enum for returning success codes
4) I know the only preparation needed before calling this method is to set the Path property of the _Persistence interface.

this is how I am calling the method:

_MarkerPtr loadedMarker(__uuidof(Marker));
_PersistencePtr persistForLoadedMarker(__uuidof
(Persistence));
//TemplatesFolderPath is a string that holds the full
//path of the template file
persistForLoadedMarker->Path = templatesFolderPath;

mtCompletionCode complCode;
BSTR errorString;
errorString = SysAllocString(L"");
BSTR inputString;
inputString = SysAllocString(L"");
complCode = loadedMarker->RestoreTemplate(persistForLoadedMarker, inputString, &errorString);

Here is where I get the runtime error.

Highly appreciate your time,
cheers,
onlyshiza