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Windows Game Programming for Dummies (2nd Edition)
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Tutorials
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Tut01_EnumSP
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EnumSP.cpp
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C/C++ Source or Header
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2001-10-08
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5KB
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161 lines
//----------------------------------------------------------------------------
// File: EnumSP.cpp
//
// Desc: This simple program inits DirectPlay and enumerates the available
// DirectPlay Service Providers.
//
// Copyright (c) 2000-2001 Microsoft Corp. All rights reserved.
//-----------------------------------------------------------------------------
#define INITGUID
#define _WIN32_DCOM
#include <stdio.h>
#include <dplay8.h>
//-----------------------------------------------------------------------------
// Global variables
//-----------------------------------------------------------------------------
IDirectPlay8Peer* g_pDP = NULL; // DirectPlay peer object
//-----------------------------------------------------------------------------
// Function-prototypes
//-----------------------------------------------------------------------------
HRESULT WINAPI DirectPlayMessageHandler(PVOID pvUserContext, DWORD dwMessageId, PVOID pMsgBuffer);
HRESULT InitDirectPlay();
void CleanupDirectPlay();
//-----------------------------------------------------------------------------
// Miscellaneous helper functions
//-----------------------------------------------------------------------------
#define SAFE_DELETE(p) { if(p) { delete (p); (p)=NULL; } }
#define SAFE_DELETE_ARRAY(p) { if(p) { delete[] (p); (p)=NULL; } }
#define SAFE_RELEASE(p) { if(p) { (p)->Release(); (p)=NULL; } }
//-----------------------------------------------------------------------------
// Name: main()
// Desc: Entry point for the application.
//-----------------------------------------------------------------------------
int main(int argc, char* argv[], char* envp[])
{
HRESULT hr;
DPN_SERVICE_PROVIDER_INFO* pdnSPInfo = NULL;
DPN_SERVICE_PROVIDER_INFO* pdnSPInfoEnum = NULL;
DWORD dwItems = 0;
DWORD dwSize = 0;
DWORD i;
// Init COM so we can use CoCreateInstance
CoInitializeEx(NULL, COINIT_MULTITHREADED);
// Init the DirectPlay system
if( FAILED( hr = InitDirectPlay() ) )
{
printf("Failed Initializing DirectPlay: 0x%X\n", hr);
goto LCleanup;
}
// Enumerate all the Service Providers available
hr = g_pDP->EnumServiceProviders(NULL, NULL, NULL, &dwSize, &dwItems, 0);
if( hr != DPNERR_BUFFERTOOSMALL)
{
printf("Failed Enumerating Service Providers: 0x%X\n", hr);
goto LCleanup;
}
pdnSPInfo = (DPN_SERVICE_PROVIDER_INFO*) new BYTE[dwSize];
if( FAILED( hr = g_pDP->EnumServiceProviders(NULL, NULL, pdnSPInfo, &dwSize, &dwItems, 0 ) ) )
{
printf("Failed Enumerating Service Providers: 0x%X\n", hr);
goto LCleanup;
}
// Run through each provider desc printing them all out
pdnSPInfoEnum = pdnSPInfo;
for (i = 0; i < dwItems; i++)
{
printf("Found Service Provider: %S\n", pdnSPInfoEnum->pwszName);
pdnSPInfoEnum++;
}
LCleanup:
SAFE_DELETE_ARRAY(pdnSPInfo);
CleanupDirectPlay();
// Cleanup COM
CoUninitialize();
return 0;
}
//-----------------------------------------------------------------------------
// Name: DirectPlayMessageHandler
// Desc: Handler for DirectPlay messages. This tutorial doesn't repond to any
// DirectPlay messages
//-----------------------------------------------------------------------------
HRESULT WINAPI DirectPlayMessageHandler( PVOID pvUserContext, DWORD dwMessageId,
PVOID pMsgBuffer)
{
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: InitDirectPlay()
// Desc: Initialize DirectPlay
//-----------------------------------------------------------------------------
HRESULT InitDirectPlay()
{
HRESULT hr = S_OK;
// Create the IDirectPlay8Peer Object
if( FAILED( hr = CoCreateInstance( CLSID_DirectPlay8Peer, NULL,
CLSCTX_INPROC_SERVER,
IID_IDirectPlay8Peer,
(LPVOID*) &g_pDP ) ) )
{
printf("Failed Creating the IDirectPlay8Peer Object: 0x%X\n", hr);
goto LCleanup;
}
// Init DirectPlay
if( FAILED( hr = g_pDP->Initialize(NULL, DirectPlayMessageHandler, 0 ) ) )
{
printf("Failed Initializing DirectPlay: 0x%X\n", hr);
goto LCleanup;
}
LCleanup:
return hr;
}
//-----------------------------------------------------------------------------
// Name: CleanupDirectPlay()
// Desc: Cleanup DirectPlay
//-----------------------------------------------------------------------------
void CleanupDirectPlay()
{
// Cleanup DirectPlay
if( g_pDP)
g_pDP->Close(0);
SAFE_RELEASE(g_pDP);
}