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Building COM Servers in .NET

, 2 Feb 2006
Learn the fundamental principles of building COM DLL and EXE Servers using a .NET language.
buildcomserversindotnet_src.zip
SimpleCOMObject
CSharpExeCOMServers
interfaces
implementations
clients
SimpleCOMObject
SimpleCOMObject.def
SimpleCOMObject.rgs
SimpleCOMObject.snk
SimpleCOMObject1.rgs
SimpleCOMObjectps.def
SimpleCOMObject.vcproj.vspscc
SimpleCOMObjectPS.vcproj.vspscc
Interop.SimpleCOMObject.dll
CPP
C#
SimpleCOMObject_CPPImpl
SimpleCOMObject_CPPImpl.def
SimpleCOMObject_CPPImpl.rgs
SimpleCOMObject_CPPImpl1.rgs
SimpleCOMObject_CPPImplps.def
SimpleCOMObject_CPPImpl.vcproj.vspscc
SimpleCOMObject_CPPImplPS.vcproj.vspscc
SimpleCOMObject_CSharpImpl
KeyFile.snk
KeyFile.snk.bak_
SimpleCOMObject_CSharpImpl.csproj.user
VB
CPP
VBClient01
FormMain.frm
MSSCCPRJ.SCC
VBClient01.exe
VBClient01.vbw
VBClient01.vbp
CPPClient01
UsingStandardCOMInterop
IDotNetClassFactory
ManagedCOMLocalServer
implementations
clients
SimpleCOMObject_CSharpExeImpl
App.ico
keyfile.snk
SimpleCOMObject_CSharpExeImpl.csproj.user
CPP
CPPClient01
testobjects
interfaces
implementations
clients
interface
implementations
ITestCSharpObjectInterfaces
TestCSharpObjectInterfaces.csproj.user
TestCSharpObjectInterfaces.snk
ITestCSharpObjectInterfacesImpl01
App.ico
ITestCSharpObjectInterfacesImpl01.csproj.user
ITestCSharpObjectInterfacesImpl01.snk
IDotNetClassFactory
IDotNetClassFactory.csproj.user
IDotNetClassFactory.snk
IDotNetClassFactory_Impl01
IDotNetClassFactory_Impl01.csproj.user
IDotNetClassFactory_Impl01.snk
CPPClient01
Debug
ITestCSharpObjectInterfacesImpl01.exe
implementations
clients
ManagedCOMLocalServer_Impl01
App.ico
keyfile.snk
ManagedCOMLocalServer_Impl01.csproj.user
CPPClient01
CPPClient01.ncb

/* this ALWAYS GENERATED file contains the proxy stub code */


 /* File created by MIDL compiler version 6.00.0361 */
/* at Thu Jan 05 00:56:24 2006
 */
/* Compiler settings for .\SimpleCOMObject_CPPImpl.idl:
    Oicf, W1, Zp8, env=Win32 (32b run)
    protocol : dce , ms_ext, c_ext, robust
    error checks: allocation ref bounds_check enum stub_data 
    VC __declspec() decoration level: 
         __declspec(uuid()), __declspec(selectany), __declspec(novtable)
         DECLSPEC_UUID(), MIDL_INTERFACE()
*/
//@@MIDL_FILE_HEADING(  )

#if !defined(_M_IA64) && !defined(_M_AMD64)


#pragma warning( disable: 4049 )  /* more than 64k source lines */
#if _MSC_VER >= 1200
#pragma warning(push)
#endif
#pragma warning( disable: 4100 ) /* unreferenced arguments in x86 call */
#pragma warning( disable: 4211 )  /* redefine extent to static */
#pragma warning( disable: 4232 )  /* dllimport identity*/
#define USE_STUBLESS_PROXY


/* verify that the <rpcproxy.h> version is high enough to compile this file*/
#ifndef __REDQ_RPCPROXY_H_VERSION__
#define __REQUIRED_RPCPROXY_H_VERSION__ 475
#endif


#include "rpcproxy.h"
#ifndef __RPCPROXY_H_VERSION__
#error this stub requires an updated version of <rpcproxy.h>
#endif // __RPCPROXY_H_VERSION__


#include "SimpleCOMObject_CPPImpl.h"

#define TYPE_FORMAT_STRING_SIZE   3                                 
#define PROC_FORMAT_STRING_SIZE   1                                 
#define TRANSMIT_AS_TABLE_SIZE    0            
#define WIRE_MARSHAL_TABLE_SIZE   0            

typedef struct _MIDL_TYPE_FORMAT_STRING
    {
    short          Pad;
    unsigned char  Format[ TYPE_FORMAT_STRING_SIZE ];
    } MIDL_TYPE_FORMAT_STRING;

typedef struct _MIDL_PROC_FORMAT_STRING
    {
    short          Pad;
    unsigned char  Format[ PROC_FORMAT_STRING_SIZE ];
    } MIDL_PROC_FORMAT_STRING;


static RPC_SYNTAX_IDENTIFIER  _RpcTransferSyntax = 
{{0x8A885D04,0x1CEB,0x11C9,{0x9F,0xE8,0x08,0x00,0x2B,0x10,0x48,0x60}},{2,0}};


extern const MIDL_TYPE_FORMAT_STRING __MIDL_TypeFormatString;
extern const MIDL_PROC_FORMAT_STRING __MIDL_ProcFormatString;


extern const MIDL_STUB_DESC Object_StubDesc;


extern const MIDL_SERVER_INFO ISimpleCOMObject_CPPImpl_ServerInfo;
extern const MIDL_STUBLESS_PROXY_INFO ISimpleCOMObject_CPPImpl_ProxyInfo;



#if !defined(__RPC_WIN32__)
#error  Invalid build platform for this stub.
#endif

#if !(TARGET_IS_NT50_OR_LATER)
#error You need a Windows 2000 or later to run this stub because it uses these features:
#error   /robust command line switch.
#error However, your C/C++ compilation flags indicate you intend to run this app on earlier systems.
#error This app will die there with the RPC_X_WRONG_STUB_VERSION error.
#endif


static const MIDL_PROC_FORMAT_STRING __MIDL_ProcFormatString =
    {
        0,
        {

			0x0
        }
    };

static const MIDL_TYPE_FORMAT_STRING __MIDL_TypeFormatString =
    {
        0,
        {
			NdrFcShort( 0x0 ),	/* 0 */

			0x0
        }
    };


/* Object interface: IUnknown, ver. 0.0,
   GUID={0x00000000,0x0000,0x0000,{0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}} */


/* Object interface: IDispatch, ver. 0.0,
   GUID={0x00020400,0x0000,0x0000,{0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46}} */


/* Object interface: ISimpleCOMObject_CPPImpl, ver. 0.0,
   GUID={0xF990BAEB,0x4380,0x4A28,{0xA4,0xA8,0x2F,0x30,0xA5,0x71,0xB1,0x95}} */

#pragma code_seg(".orpc")
static const unsigned short ISimpleCOMObject_CPPImpl_FormatStringOffsetTable[] =
    {
    (unsigned short) -1,
    (unsigned short) -1,
    (unsigned short) -1,
    (unsigned short) -1,
    0
    };

static const MIDL_STUBLESS_PROXY_INFO ISimpleCOMObject_CPPImpl_ProxyInfo =
    {
    &Object_StubDesc,
    __MIDL_ProcFormatString.Format,
    &ISimpleCOMObject_CPPImpl_FormatStringOffsetTable[-3],
    0,
    0,
    0
    };


static const MIDL_SERVER_INFO ISimpleCOMObject_CPPImpl_ServerInfo = 
    {
    &Object_StubDesc,
    0,
    __MIDL_ProcFormatString.Format,
    &ISimpleCOMObject_CPPImpl_FormatStringOffsetTable[-3],
    0,
    0,
    0,
    0};
CINTERFACE_PROXY_VTABLE(7) _ISimpleCOMObject_CPPImplProxyVtbl = 
{
    0,
    &IID_ISimpleCOMObject_CPPImpl,
    IUnknown_QueryInterface_Proxy,
    IUnknown_AddRef_Proxy,
    IUnknown_Release_Proxy ,
    0 /* (void *) (INT_PTR) -1 /* IDispatch::GetTypeInfoCount */ ,
    0 /* (void *) (INT_PTR) -1 /* IDispatch::GetTypeInfo */ ,
    0 /* (void *) (INT_PTR) -1 /* IDispatch::GetIDsOfNames */ ,
    0 /* IDispatch_Invoke_Proxy */
};


static const PRPC_STUB_FUNCTION ISimpleCOMObject_CPPImpl_table[] =
{
    STUB_FORWARDING_FUNCTION,
    STUB_FORWARDING_FUNCTION,
    STUB_FORWARDING_FUNCTION,
    STUB_FORWARDING_FUNCTION
};

CInterfaceStubVtbl _ISimpleCOMObject_CPPImplStubVtbl =
{
    &IID_ISimpleCOMObject_CPPImpl,
    &ISimpleCOMObject_CPPImpl_ServerInfo,
    7,
    &ISimpleCOMObject_CPPImpl_table[-3],
    CStdStubBuffer_DELEGATING_METHODS
};

static const MIDL_STUB_DESC Object_StubDesc = 
    {
    0,
    NdrOleAllocate,
    NdrOleFree,
    0,
    0,
    0,
    0,
    0,
    __MIDL_TypeFormatString.Format,
    1, /* -error bounds_check flag */
    0x50002, /* Ndr library version */
    0,
    0x6000169, /* MIDL Version 6.0.361 */
    0,
    0,
    0,  /* notify & notify_flag routine table */
    0x1, /* MIDL flag */
    0, /* cs routines */
    0,   /* proxy/server info */
    0   /* Reserved5 */
    };

const CInterfaceProxyVtbl * _SimpleCOMObject_CPPImpl_ProxyVtblList[] = 
{
    ( CInterfaceProxyVtbl *) &_ISimpleCOMObject_CPPImplProxyVtbl,
    0
};

const CInterfaceStubVtbl * _SimpleCOMObject_CPPImpl_StubVtblList[] = 
{
    ( CInterfaceStubVtbl *) &_ISimpleCOMObject_CPPImplStubVtbl,
    0
};

PCInterfaceName const _SimpleCOMObject_CPPImpl_InterfaceNamesList[] = 
{
    "ISimpleCOMObject_CPPImpl",
    0
};

const IID *  _SimpleCOMObject_CPPImpl_BaseIIDList[] = 
{
    &IID_IDispatch,
    0
};


#define _SimpleCOMObject_CPPImpl_CHECK_IID(n)	IID_GENERIC_CHECK_IID( _SimpleCOMObject_CPPImpl, pIID, n)

int __stdcall _SimpleCOMObject_CPPImpl_IID_Lookup( const IID * pIID, int * pIndex )
{
    
    if(!_SimpleCOMObject_CPPImpl_CHECK_IID(0))
        {
        *pIndex = 0;
        return 1;
        }

    return 0;
}

const ExtendedProxyFileInfo SimpleCOMObject_CPPImpl_ProxyFileInfo = 
{
    (PCInterfaceProxyVtblList *) & _SimpleCOMObject_CPPImpl_ProxyVtblList,
    (PCInterfaceStubVtblList *) & _SimpleCOMObject_CPPImpl_StubVtblList,
    (const PCInterfaceName * ) & _SimpleCOMObject_CPPImpl_InterfaceNamesList,
    (const IID ** ) & _SimpleCOMObject_CPPImpl_BaseIIDList,
    & _SimpleCOMObject_CPPImpl_IID_Lookup, 
    1,
    2,
    0, /* table of [async_uuid] interfaces */
    0, /* Filler1 */
    0, /* Filler2 */
    0  /* Filler3 */
};
#if _MSC_VER >= 1200
#pragma warning(pop)
#endif


#endif /* !defined(_M_IA64) && !defined(_M_AMD64)*/

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Lim Bio Liong
Web Developer
Singapore Singapore
Lim Bio Liong is a Specialist at a leading Software House in Singapore.
 
Bio has been in software development for over 10 years. He specialises in C/C++ programming and Windows software development.
 
Bio has also done device-driver development and enjoys low-level programming. Bio has recently picked up C# programming and has been researching in this area.

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