COM in please, how to make out-of-process COM server work? (fixed) - com

Question

I have difficult to make an out-of-process COM server work properly. My steps are
1. define idl (classic.idl)
import "objidlbase.idl";
[
uuid(CF86E2E0-B12D-4C6A-9C5A-D7AA65101E91),
]
coclass CClassic
{
[default] interface IClassic;
}
[
object,
uuid(CF86E2E0-B12D-4C6A-9C5A-D7AA65101E90),
pointer_default(unique)
]
interface IClassic : IUnknown
{
HRESULT Hello();
}
2. generate the proxy/stub files
midl /nologo /out classic /I"D:\EWDK\Program Files\Windows Kits\10\Include\10.0.19041.0\um" /I"D:\EWDK\Program Files\Windows Kits\10\Include\10.0.19041.0\shared" classic.idl
3. implement the interface (comobj.cpp)
#include <atlbase.h>
#include <atlcom.h>
#include "classic/classic.h"
CComModule _Module;
extern "C" CLSID CLSID_CClassic;
struct Toast : CComObjectRoot,CComCoClass<Toast,&CLSID_CClassic>,IClassic
{
DECLARE_REGISTRY(CLSID_CClassic,"Toaster.1.0","Toaster","Toast Server",THREADFLAGS_BOTH);
DECLARE_CLASSFACTORY();
DECLARE_OBJECT_DESCRIPTION("Toast Server");
BEGIN_COM_MAP(Toast)
COM_INTERFACE_ENTRY(IClassic)
END_COM_MAP();
HRESULT STDMETHODCALLTYPE Hello( void)
{
printf("Hello\n");
return S_OK;
}
};
OBJECT_ENTRY_AUTO(CLSID_CClassic,Toast);
4. write the out-of-process module (comexe.cpp)
#include <atlbase.h>
#include <atlcom.h>
struct MyModule : CAtlExeModuleT<MyModule>
{
};
MyModule mod;
int main(int argc, char *args[])
{
mod.WinMain(SW_HIDE);
}
5. compile the module
cl /nologo /EHsc comexe.cpp comobj.cpp classic/classic_i.c /link /debug
6. compile the proxy/stub
cl /nologo /EHsc /DREGISTER_PROXY_DLL /DPROXY_CLSID=CLSID_CClassic classic/classic_p.c classic/classic_i.c classic/dlldata.c /link /dll /out:comproxy.dll /export:DllGetClassObject /export:DllCanUnloadNow /export:DllRegisterServer /export:DllUnregisterServer /export:GetProxyDllInfo rpcrt4.lib
7. register server (with sysadmin account)
comexe /RegServer
8. register proxy/stub (with sysadmin account)
regsvr32 comproxy.dll
7 and 8 are on the same machine
9. write a test client (test.cpp)
#include <Unknwn.h>
#include <stdio.h>
#include "classic\classic.h"
#pragma comment(lib, "ole32")
extern "C" CLSID CLSID_CClassic;
int main(int argc, char *args[])
{
CoInitialize(nullptr);
IClassic *ifc = nullptr;
HRESULT hr;
if(argc<2) return 1;
switch(args[1][0])
{
case 'I':
case 'i':
hr = CoCreateInstance(CLSID_CClassic,nullptr,CLSCTX_INPROC_SERVER,IID_IClassic,(void**)&ifc);
break;
case 'O':
case 'o':
hr = CoCreateInstance(CLSID_CClassic,nullptr,CLSCTX_LOCAL_SERVER,IID_IClassic,(void**)&ifc);
default:
;
}
printf("0x%x\n",hr);
}
10. compile the test
cl /nologo /std:c++latest /EHsc test.cpp classic/classic_i.c /link /debug
11. run the test
on the same machine
test O
0x80004002
test I
0x80004002
Please help. Many thanks!!!
Update
Finally, I found in the step 6 I should use PROXY_CLSID_IS instead of PROXY_CLSID to define the CLSID for the proxy/stub which must different from CLSID_CClassic, that is:
cl /nologo /EHsc /DREGISTER_PROXY_DLL /DPROXY_CLSID_IS={0xCF86E2E0,0xB12D,0x4C6A,{0x9C,0x5A,0xD7,0xAA,0x65,0x10,0x1E,0x93}} classic/classic_p.c classic/classic_i.c classic/dlldata.c /link /dll /out:comproxy.dll /export:DllGetClassObject /export:DllCanUnloadNow /export:DllRegisterServer /export:DllUnregisterServer /export:GetProxyDllInfo rpcrt4.lib
and this time
test O
0x0
and test I still failed, but I think it is not the right way to call an out-of-process server.