[About IDL:Proxy/Stub]

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I wanto to define a custom proxy/stub com object At VC6.0 Envirment,steps as follow：
1、Define A Simple IDL File
2、Compile it by MIDL
3、Add *_i.c、*_p.c、*.h、*.def To Empty Win32 DLL
4、Define Funtion：DllGetClassObject、DllCanUnloadNow etc.
5、Compile All Dll
Link Error Happened：
**************************************************************
Main.obj : error LNK2005: _DllGetClassObject@12 already defined in dlldata.obj
Main.obj : error LNK2005: _DllCanUnloadNow@0 already defined in dlldata.obj
Main.obj : warning LNK4006: _DllGetClassObject@12 already defined in dlldata.obj; second definition ignored
Main.obj : warning LNK4006: _DllCanUnloadNow@0 already defined in dlldata.obj; second definition ignored
Creating library Debug/HelloProxyStub.lib and object Debug/HelloProxyStub.exp
HelloProxyStub.exp : warning LNK4070: /OUT:HelloProxyStubDef.dll directive in .EXP differs from output filename "Debug/HelloProxyStub.dll"; ignoring directive
Debug/HelloProxyStub.dll : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.
**************************************************************

Posted 7-Mar-10 20:40pm

yingkou

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5 solutions

Solution 2

To upstairs:Thank You And I Have Other Question
If i want to realize a custom proxy/stub structure，I Must Build More Than One Proxy/Stub For All Com Object？Such As：ClassFactory、COM Class1、COM Class2,Because The macro DLLDATA_ROUTINES in dlldata.c
has already defined DllGetClassObject(This Function Definition A Com Object)。

Posted 8-Mar-10 3:33am

yingkou

Solution 3

I think, the first parameter of DllGetClassObject
could be different for the different classes... :)

Posted 8-Mar-10 3:40am

Eugen Podsypalnikov

Solution 4

To Upstairs：
DllGetClassObject Is Defined By MIDL，How Can I Change its Definition？and How does The Com library know which class is derived from
the custom interface?

Posted 8-Mar-10 14:18pm

yingkou

Solution 5

A Proxy DLL is a gate only :)

The creation of a class instance -
is a task of your server :)

Posted 8-Mar-10 20:44pm

Eugen Podsypalnikov

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Eugen Podsypalnikov · Accepted Answer · 2010-03-07T21:02:00

Solution 1

The macro DLLDATA_ROUTINES in your dlldata.c

has already defined DllGetClassObject and DllCanUnloadNow,
so you have not to do it twice (your fourth position) :)

Posted 7-Mar-10 21:02pm

Eugen Podsypalnikov