Part2 of COM

1. 1
COM
architecture
nonezerok@gmail.com
저자의 동의 없이 본 문서 일부 또는 전체의 무단복제를 불허합니다.

2. 2
Burden O.S with Server Loading
• CLSID
• ProgID: <Program>.<Component>.<Version>
– Visio.Application.3
– RealAudio.RealAudioo ActiveX Control (32-bit).1
– Office.Binder.95
(ProgID) CLSID Server Path
{0x39ebbe42, 0xb1c, 0x4369,
{0xb6, 0x91, 0x53, 0xc2, 0x7b,
0x66, 0x8, 0xd5}}
c:myserver.dll

3. 3
HKEY_CLASSES_ROOT
CLSID
@=Circle
LocalServer32
@=C:binshape.exe
@=Square
InprocServer32
@=C:binshape.dll
{CLSID_Square}{CLSID_Circle}
LocalServer32
@=C:binshape.exe
Friendly name
Location of component
Windows Registry

4. 4
Functions for Client
HRESULT CoGetClassObject (
REFCLSID rclsid,
DWORD dwClsContext,
COSERVERINFO pServerInfo,
REFIID riid,
LPVOID *ppv );
HRESULT CoCreateInstance (
REFCLSID rclsid,
LPUNKNOWN pUnkOuter,
DWORD dwClsContext,
REFIID riid,
LPVOID *ppv );
- Loading Server
- Getting Interface

5. 5
Functions for Server
extern “C” HRESULT __stdcall
DllRegisterServer()
extern “C” HRESULT __stdcall
DllUnRegisterServer()
extern “C” HRESULT __stdcall
DllGetClassObject(const CLSID&,const IID&, void**)
CreateInstance()
REGSVR32.EXE [-u] server.dll

6. 6
serverclient
registry
finding
binding
registration
execution
COM Architecture (?)

7. 7
Multiple Instances
a.exe b.dll
The number of instances needed
depends on the client

8. 8
a.exe b.dll
CFactory & IClassFactory
IClassFactory
CFactory
- CreateInstance()
- LockServer()

9. 9
In-Process Server
a.exe b.dll
The b.dll is executable but can’t be executed by itself

10. 10
Local Process Server
a.exe b.exe
Local Procedure Call
Remote Procedure Call
Proxy Stub
Inter-Process Communication channel
marshaling/unmarshaling

11. 11
Interface Definition Language
import "unknwn.idl";
[
object,
uuid(32bb8323-b41b-11cf-a6bb-0080c7b2d682),
helpstring("IX Interface"),
pointer_default(unique)
]
interface IX : IUnknown
{
HRESULT FxStringIn([in, string] wchar_t* szIn);
HRESULT FxStringOut([out, string] wchar_t** szOut);
};
[
uuid(60D754D5-DDBA-4D23-A84A-63A812AB2C49)
]
coclass COMPONENT
{
interface IX;
}

12. 12
MIDL.EXE
a.idl
interface guid proxy/stub dll
MIDL
a.h a_c.c a_p.c dlldata.c

13. 13
COM vs Web Service
Interface
IDL
Registry
LPC/RPC
plain text
Service
WSDL
UDDI
SOAP
XML
(Web Service Description Language)
(Universal Description, Discovery
and Integration)
(Simple Object Access Protocol)
COM Web Service

14. 14
UDDI
finding publication
SOAP
Service
Provider
Service
Consumer
Service
Broker
XML
WSDL
WS Architecture
Service Oriented
Architecture (SOA)