Calling a COM dll from another COM dll

[vatsa]

Hi,

Please suggest how to call a COM dll from another COM dll in VC++ 6.0?

I have a requirement in which I have to call a COM dll built in VC++ 9.0 in another COM dll which is VC++ 6.0.

[Deepak_Sharma]

hello,

in its simplest form

you will need to create the COM object inside the COM DLL.

say Client application initiate COM DLL one

by executing lines like

ICOMDLLPtr pCOMDLL (__uuidof(COMDLL));

pCOMDLL ->CallDiffrentCOMFunction()



in the CallDiffrentCOMFunction() in side the COM DLL

{
ICOMDLL2Ptr pCOMDLL2 (__uuidof(COMDLL2));

pCOMDLL2 ->CallAnotherFunction()

}

NOTE: however as your COM application gets complex, you will need to understand logic behind apartments, marshaling etc..


regard
deepak