I have a COM component in ATL, one of its method's IDL define is as the
following:
HRESULT SetValue(long a, [in] long* b,[in]string* c, [in]VARIANT* d,
[out,retval] ConfirmVal e);
here ConfirmVal is a Enum define by IDL.

The VC++ client has no problem to call it by using smart pointer as the
followings:
long a=0;
long b=-1;
CComBSTR c=L"NAME";
d = ICxValuePtr(__uuidof(ICxValue)); //d is another smartpointer, it is a
IDispatch interface in IDL
ConfirmVal e;
ptr->SetValue(a,&b,&c,d,&e)
....

When my C# client calls it as the followings, it throws COMException with
"Unspecified error":
int a=0;
int b=-1;
string c="NAME";
CxValueObject d = new CxValueObject(); //CxValueObject is the class
corresponding to ICxValue interface in the assembly converted by tlbimp.exe
ConfirmVal e;
obj.SetValue(a, ref b, ref c, d, out e); //Throws COMException with
"Unspecified error" here
....

The signature of SetValue in C# in the assembly is void SetValue(int,ref
int,ref string,object,out ConfirmVal).

Can anybody give a clue?

Thanks in advance.

Simon

Hi!

Typically, when you TLBIMP a COM class, the class is actually suffixed with
the "Class" string in its .NET version, while the original class name is
actually made to be an interface. So try this:

CxValueObject d = new CxValueObjectClass();

Regards,
Gaurav Khanna

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"Simon LU" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> I have a COM component in ATL, one of its method's IDL define is as the
> following:
> HRESULT SetValue(long a, [in] long* b,[in]string* c, [in]VARIANT* d,
> [out,retval] ConfirmVal e);
> here ConfirmVal is a Enum define by IDL.
>
> The VC++ client has no problem to call it by using smart pointer as the
> followings:
> long a=0;
> long b=-1;
> CComBSTR c=L"NAME";
> d = ICxValuePtr(__uuidof(ICxValue)); //d is another smartpointer, it is
a
> IDispatch interface in IDL
> ConfirmVal e;
> ptr->SetValue(a,&b,&c,d,&e)
> ...
>
> When my C# client calls it as the followings, it throws COMException with
> "Unspecified error":
> int a=0;
> int b=-1;
> string c="NAME";
> CxValueObject d = new CxValueObject(); //CxValueObject is the class
> corresponding to ICxValue interface in the assembly converted by
tlbimp.exe
> ConfirmVal e;
> obj.SetValue(a, ref b, ref c, d, out e); //Throws COMException with
> "Unspecified error" here
> ...
>
> The signature of SetValue in C# in the assembly is void SetValue(int,ref
> int,ref string,object,out ConfirmVal).
>
> Can anybody give a clue?
>
> Thanks in advance.
>
> Simon
>
>