captain-blood/System/Controls/utils.cpp

#include "utils.h"

#ifndef _XBOX

#ifndef SAFE_RELEASE
#define SAFE_RELEASE(p)      { if(p) { (p)->Release(); (p)=NULL; } }
#endif

#include <objbase.h>
#include <wbemidl.h>


#pragma warning (disable : 4996)
#include <stdio.h>


//-----------------------------------------------------------------------------
// Enum each PNP device using WMI and check each device ID to see if it contains 
// "IG_" (ex. "VID_045E&PID_028E&IG_00").  If it does, then it's an XInput device
// Unfortunately this information can not be found by just using DirectInput 
//-----------------------------------------------------------------------------
bool IsXInputDevice( const GUID* pGuidProductFromDirectInput )
{
	IWbemLocator*           pIWbemLocator  = NULL;
	IEnumWbemClassObject*   pEnumDevices   = NULL;
	IWbemClassObject*       pDevices[20]   = {0};
	IWbemServices*          pIWbemServices = NULL;
	BSTR                    bstrNamespace  = NULL;
	BSTR                    bstrDeviceID   = NULL;
	BSTR                    bstrClassName  = NULL;
	DWORD                   uReturned      = 0;
	bool                    bIsXinputDevice= false;
	UINT                    iDevice        = 0;
	VARIANT                 var;
	HRESULT                 hr;

	// CoInit if needed
	hr = CoInitialize(NULL);
	bool bCleanupCOM = SUCCEEDED(hr);

	// Create WMI
	hr = CoCreateInstance( __uuidof(WbemLocator),
		NULL,
		CLSCTX_INPROC_SERVER,
		__uuidof(IWbemLocator),
		(LPVOID*) &pIWbemLocator);
	if( FAILED(hr) || pIWbemLocator == NULL )
		goto LCleanup;

	bstrNamespace = SysAllocString( L"\\\\.\\root\\cimv2" );if( bstrNamespace == NULL ) goto LCleanup;        
	bstrClassName = SysAllocString( L"Win32_PNPEntity" );   if( bstrClassName == NULL ) goto LCleanup;        
	bstrDeviceID  = SysAllocString( L"DeviceID" );          if( bstrDeviceID == NULL )  goto LCleanup;        

	// Connect to WMI 
	hr = pIWbemLocator->ConnectServer( bstrNamespace, NULL, NULL, 0L, 
		0L, NULL, NULL, &pIWbemServices );
	if( FAILED(hr) || pIWbemServices == NULL )
		goto LCleanup;

	// Switch security level to IMPERSONATE. 
	CoSetProxyBlanket( pIWbemServices, RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE, NULL, 
		RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE );                    

	hr = pIWbemServices->CreateInstanceEnum( bstrClassName, 0, NULL, &pEnumDevices ); 
	if( FAILED(hr) || pEnumDevices == NULL )
		goto LCleanup;

	// Loop over all devices
	for( ;; )
	{
		// Get 20 at a time
		hr = pEnumDevices->Next( 10000, 20, pDevices, &uReturned );
		if( FAILED(hr) )
			goto LCleanup;
		if( uReturned == 0 )
			break;

		for( iDevice=0; iDevice<uReturned; iDevice++ )
		{
			// For each device, get its device ID
			hr = pDevices[iDevice]->Get( bstrDeviceID, 0L, &var, NULL, NULL );
			if( SUCCEEDED( hr ) && var.vt == VT_BSTR && var.bstrVal != NULL )
			{
				// Check if the device ID contains "IG_".  If it does, then it's an XInput device
				// This information can not be found from DirectInput 
				if( wcsstr( var.bstrVal, L"IG_" ) )
				{
					// If it does, then get the VID/PID from var.bstrVal
					DWORD dwPid = 0, dwVid = 0;
					WCHAR* strVid = wcsstr( var.bstrVal, L"VID_" );
					if( strVid && swscanf( strVid, L"VID_%4X", &dwVid ) != 1 )
						dwVid = 0;
					WCHAR* strPid = wcsstr( var.bstrVal, L"PID_" );
					if( strPid && swscanf( strPid, L"PID_%4X", &dwPid ) != 1 )
						dwPid = 0;

					// Compare the VID/PID to the DInput device
					DWORD dwVidPid = MAKELONG( dwVid, dwPid );
					if( dwVidPid == pGuidProductFromDirectInput->Data1 )
					{
						bIsXinputDevice = true;
						goto LCleanup;
					}
				}
			}   
			SAFE_RELEASE( pDevices[iDevice] );
		}
	}

LCleanup:
	if(bstrNamespace)
		SysFreeString(bstrNamespace);
	if(bstrDeviceID)
		SysFreeString(bstrDeviceID);
	if(bstrClassName)
		SysFreeString(bstrClassName);
	for( iDevice=0; iDevice<20; iDevice++ )
		SAFE_RELEASE( pDevices[iDevice] );
	SAFE_RELEASE( pEnumDevices );
	SAFE_RELEASE( pIWbemLocator );
	SAFE_RELEASE( pIWbemServices );

	if( bCleanupCOM )
		CoUninitialize();

	return bIsXinputDevice;
}

#pragma warning (default : 4996)

#endif