Сущность технологии СОМ. Библиотека программиста
Шрифт:
import «objidl.idl»;
[propget] HRESULT SessionName([out, string] OLECHAR **ppwsz);
HRESULT Say([in, string] const OLECHAR *pwszStatement);
HRESULT GetStatements([out] IEnumString **ppes);
HRESULT Advise([in] IChatSessionEvents *pEventSink,
[out] DWORD *pdwReg);
HRESULT Unadvise([in] DWORD dwReg);
}
[
uuid(5223A051-2441-11d1-AF4F-0060976AA886),
object
]
interface IChatSessionEvents : IUnknown
{
import
HRESULT OnNewUser([in, string] const OLECHAR *pwszUser);
HRESULT OnUserLeft([in, string] const OLECHAR *pwszUser);
HRESULT OnNewStatement([in, string] const OLECHAR *pwszUser,
[in, string] const OLECHAR *pwszStmnt);
}
[
uuid(5223A052-2441-11d1-AF4F-0060976AA886),
object
]
interface IChatSessionManager : IUnknown
{
import «objidl.idl»;
HRESULT GetSessionNames([out] IEnumString **ppes);
HRESULT FindSession([in, string] const OLECHAR *pwszName,
[in] BOOL bDontCreate,
[in] BOOL bAllowAnonymousAccess,
[out] IChatSession **ppcs);
HRESULT DeleteSession([in, string] const OLECHAR *pwszName);
}
cpp_quote(«DEFINE_GUID(CLSID_ChatSession,0x5223a053,0x2441,»)
cpp_quote(«0x11d1,0xaf,0x4f,0x0,0x60,0x97,0x6a,0xa8,0x86);»)
/////////////////////////////////////////////////////
//
// client.cpp
//
// Copyright 1997, Don Box/Addison Wesley
//
// This code accompanies the book "The Component
// Object Model" from Addison Wesley. Blah blah blah
//
//
#define _WIN32_WINNT 0x403
#include <windows.h>
#include <stdio.h>
#include <initguid.h>
#include <wchar.h>
#include «../include/COMChat.h»
#include «../include/COMChat_i.c»
void Error(HRESULT hr, const char *psz)
{
printf(«%s failed and returned 0x%x\n», psz, hr);
}
// utility function to print command line syntax
int Usage(void)
{
const char *psz =
«usage: client.exe <action> <user> <host>\n»
« where:\n»
« action = /sessions|/chat:session|/delete:session\n»
« user = /user:domain\\user /password:pw |»
«/anonymous | <nothing>\n»
« host = /host:hostname | <nothing>\n»;
printf(psz);
return -1;
}
// utility function for printing a list of strings
void PrintAllStrings(IEnumString *pes)
{
enum { CHUNKSIZE = 64 };
OLECHAR *rgpwsz[CHUNKSIZE];
ULONG cFetched;
HRESULT hr;
do
{
hr = pes->Next(CHUNKSIZE, rgpwsz, &cFetched);
if (SUCCEEDED(hr))
{
for (ULONG i = 0; i < cFetched; i++)
if (rgpwsz[i])
{
wprintf(L"%s\n", rgpwsz[i]);
CoTaskMemFree(rgpwsz[i]);
}
}
} while (hr == S_OK);
}
// utility function to print initial state of
// a chat session
void PrintToDate(IChatSession *pcs)
{
IEnumString *pes = 0;
HRESULT hr = pcs->GetStatements(&pes);
if (SUCCEEDED(hr))
{
PrintAllStrings(pes);
pes->Release;
}
}
// this class implements the callback interface
// that receives chat notifications. It simply
// prints the event to the console
class EventSink : public IChatSessionEvents
{
public:
STDMETHODIMP QueryInterface(REFIID riid, void**ppv)
{
if (riid == IID_IUnknown)
*ppv = static_cast<IChatSessionEvents*>(this);
else if (riid == IID_IChatSessionEvents)
*ppv = static_cast<IChatSessionEvents*>(this);
else
return (*ppv = 0), E_NOINTERFACE;
reinterpret_cast<IUnknown*>(*ppv)->AddRef;
return S_OK;
}
STDMETHODIMP_(ULONG) AddRef(void)
{
return 2;
}
STDMETHODIMP_(ULONG) Release(void)
{
return 1;
}
STDMETHODIMP OnNewStatement(const OLECHAR *pwszUser,
const OLECHAR *pwszStmt)
{
wprintf(L"%-14s: %s\n", pwszUser, pwszStmt);
return S_OK;
}
STDMETHODIMP OnNewUser(const OLECHAR *pwszUser)
{
wprintf(L"\n\n>>> Say Hello to %s\n\n", pwszUser);
return S_OK;
}
STDMETHODIMP OnUserLeft(const OLECHAR *pwszUser)
{
wprintf(L"\n\n>>> Say Bye to %s\n\n", pwszUser);
return S_OK;
}
};
// type of operations this client can perform
enum ACTION
{
ACTION_NONE,
ACTION_CHAT,
ACTION_DELETE_SESSION,
ACTION_LIST_SESSION_NAMES,
};
// run chat command
void Chat(const OLECHAR *pwszSession,
IChatSessionManager *pcsm, // manager
COAUTHIDENTITY *pcai, // user
bool bAnonymous) // anonymous
{
// create or get the named session
IChatSession *pcs = 0;
HRESULT hr = pcsm->FindSession(pwszSession, FALSE,
TRUE, &pcs);
if (SUCCEEDED(hr))