Поскольку вопрос был помечен как "C ++", я исправил ваш код, используя методы C ++ для проверки и очистки ошибок. Оказалось, что вы забыли проверить неисправность в нескольких местах. Приведенный ниже код сообщает о первом сбое в GetObject(className, ...).
#define _WIN32_DCOM
#pragma comment(lib, "wbemuuid.lib")
#include <iostream>
#include <string>
#include <stdexcept>
#include <stdlib.h> // EXIT_FAILURE, EXIT_SUCCESS
using namespace std;
#include <comdef.h>
#include <Wbemidl.h>
#define DEF_SMARTPTR_TYPE( Interface ) \
_COM_SMARTPTR_TYPEDEF( Interface, __uuidof( Interface ) )
DEF_SMARTPTR_TYPE( IWbemLocator );
DEF_SMARTPTR_TYPE( IWbemServices );
DEF_SMARTPTR_TYPE( IWbemClassObject );
bool throwX( string const& s ) { throw std::runtime_error( s ); }
string hexFrom( unsigned long v )
{
char buf[40];
sprintf( buf, "%08lx", v );
return buf;
}
struct Fail
{
string message;
explicit Fail( string const& aMessage ): message( aMessage ) {}
};
void operator ||( HRESULT hr, Fail const& failure )
{
SUCCEEDED( hr )
|| throwX( failure.message + " (Error code 0x" + hexFrom( hr ) + ")" );
}
struct ComLibUsage
{
struct Threading
{
enum Enum {
singleThreaded = COINIT_APARTMENTTHREADED,
multiThreaded = COINIT_MULTITHREADED
};
};
ComLibUsage( Threading::Enum threading = Threading::multiThreaded )
{
::CoInitializeEx( 0, threading )
|| Fail( "Failed to initialize COM library." );
}
~ComLibUsage() { ::CoUninitialize(); }
};
void cppMain()
{
// Step 1: --------------------------------------------------
// Initialize COM. ------------------------------------------
ComLibUsage comLibUsage( ComLibUsage::Threading::multiThreaded );
// Step 2: --------------------------------------------------
// Set general COM security levels --------------------------
// Note: If you are using Windows 2000, you must specify -
// the default authentication credentials for a user by using
// a SOLE_AUTHENTICATION_LIST structure in the pAuthList ----
// parameter of CoInitializeSecurity ------------------------
CoInitializeSecurity(
NULL,
-1, // COM negotiates service
NULL, // Authentication services
NULL, // Reserved
RPC_C_AUTHN_LEVEL_DEFAULT, // Default authentication
RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation
NULL, // Authentication info
EOAC_NONE, // Additional capabilities
NULL // Reserved
) || Fail( "Failed to initialize security" );
// Step 3: ---------------------------------------------------
// Obtain the initial locator to WMI -------------------------
IWbemLocatorPtr pLoc;
CoCreateInstance(
CLSID_WbemLocator,
0,
CLSCTX_INPROC_SERVER,
IID_IWbemLocator, (LPVOID *) &pLoc
) || Fail( "Failed to create IWbemLocator object." );
// Step 4: ---------------------------------------------------
// Connect to WMI through the IWbemLocator::ConnectServer method
// Connect to the local root\cimv2 namespace
// and obtain pointer pSvc to make IWbemServices calls.
IWbemServicesPtr pSvc;
pLoc->ConnectServer(
_bstr_t(L"ROOT\\wmi"),
NULL,
NULL,
0,
NULL,
0,
0,
&pSvc
) || Fail( "Could not connect." );
cout << "Connected to ROOT\\CIMV2 WMI namespace" << endl;
// Step 5: --------------------------------------------------
// Set security levels for the proxy ------------------------
CoSetProxyBlanket(
pSvc, // Indicates the proxy to set
RPC_C_AUTHN_WINNT, // RPC_C_AUTHN_xxx
RPC_C_AUTHZ_NONE, // RPC_C_AUTHZ_xxx
NULL, // Server principal name
RPC_C_AUTHN_LEVEL_CALL, // RPC_C_AUTHN_LEVEL_xxx
RPC_C_IMP_LEVEL_IMPERSONATE, // RPC_C_IMP_LEVEL_xxx
NULL, // client identity
EOAC_NONE // proxy capabilities
) || Fail( "Could not set proxy blanket" );
////////////////////////////////////////////////////////////////
// set up to call the WmiSetBrightness Method
_bstr_t methodName = L"WmiSetBrightness";
_bstr_t className = L"WmiMonitorBrightnessMethods";
IWbemClassObjectPtr pClass;
pSvc->GetObject(className, 0, NULL, &pClass, NULL)
|| Fail( "GetObject(className, ...) failed" );
IWbemClassObjectPtr pInParamsDefinition;
pClass->GetMethod(methodName, 0, &pInParamsDefinition, NULL)
|| Fail( "GetMethod(methodName, ...) failed" );
IWbemClassObjectPtr pClassInstance;
pInParamsDefinition->SpawnInstance(0, &pClassInstance)
|| Fail( "SpawnInstance failed" );
_variant_t var1( L"1000" );
pClassInstance->Put(L"Timeout", 0, &var1, CIM_UINT32) //CIM_UINT64
|| Fail( "Put failed for 'Timeout'" );
_variant_t var2( L"30" );
pClassInstance->Put(L"Brightness", 0, &var2, CIM_UINT8)
|| Fail( "Put failed for 'Brightness'" );
// Execute Method
IWbemClassObject* pOutParams = NULL;
//hres = pSvc->ExecMethod(className, methodName, 0,
//NULL, pClassInstance, &pOutParams, NULL)
//|| Fail( "Could not execute method" );
// To see what the method returned,
// use the following code. The return value will
// be in &varReturnValue
_variant_t varReturnValue;
pOutParams->Get(_bstr_t(L"ReturnValue"), 0, &varReturnValue, NULL, 0)
|| Fail( "Get failed" );
}
int main()
{
try
{
cppMain();
return EXIT_SUCCESS;
}
catch( exception const& x )
{
cerr << "!" << x.what() << endl;
}
return EXIT_FAILURE;
}
Ура & hth. (даже если это немного на стороне вашего вопроса!),