Passage de plusieurs variables à ExecMethod

Question

J'essaie d'appeler wmisetbrightness, mais il faut deux entrées. Comment puis-je transmettre plus d'une entrée à ExecMethod? L'extrait de code ci-dessous est évidemment faux.

// set up to call the WmiSetBrightness Method 
BSTR MethodName = SysAllocString(L"WmiSetBrightness"); 
BSTR ClassName = SysAllocString(L"WmiMonitorBrightnessMethods"); 

IWbemClassObject* pClass = NULL; 
hres = pSvc->GetObject(ClassName, 0, NULL, &pClass, NULL); 

IWbemClassObject* pInParamsDefinition = NULL; 
hres = pClass->GetMethod(MethodName, 0, 
    &pInParamsDefinition, NULL); 

IWbemClassObject* pClassInstance = NULL; 
hres = pInParamsDefinition->SpawnInstance(0, &pClassInstance); 

// Create the values for the in parameters 
VARIANT varCommand; 
varCommand.vt = VT_UI8; 
varCommand.ullVal = 30; 
//// Store the value for the in parameters 
hres = pClassInstance->Put(L"CommandLine", 0, &varCommand, 0); 

// Execute Method 
IWbemClassObject* pOutParams = NULL; 
hres = pSvc->ExecMethod(ClassName, MethodName, 0, 
NULL, pClassInstance, &pOutParams, NULL); 

edit: WmiSetBrightness prend deux variables:

uint32 WmiSetBrightness ( uint64 Timeout, uint8 Luminosité); Le code ci-dessus ne passe que le premier paramètre d'entrée, et je ne sais pas comment le modifier pour passer les deux paramètres.

code complet ici:

#define _WIN32_DCOM 

#include <iostream> 
using namespace std; 
#include <comdef.h> 
#include <Wbemidl.h> 

# pragma comment(lib, "wbemuuid.lib") 

int main(int iArgCnt, char ** argv) 
{ 
HRESULT hres; 

// Step 1: -------------------------------------------------- 
// Initialize COM. ------------------------------------------ 

hres = CoInitializeEx(0, COINIT_MULTITHREADED); 
if (FAILED(hres)) 
{ 
    cout << "Failed to initialize COM library. Error code = 0x" 
     << hex << hres << endl; 
    return 1;     // Program has failed. 
} 

// 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 ------------------------ 

hres = 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 
    ); 


if (FAILED(hres)) 
{ 
    cout << "Failed to initialize security. Error code = 0x" 
     << hex << hres << endl; 
    CoUninitialize(); 
    return 1;      // Program has failed. 
} 

// Step 3: --------------------------------------------------- 
// Obtain the initial locator to WMI ------------------------- 

IWbemLocator *pLoc = NULL; 

hres = CoCreateInstance(
    CLSID_WbemLocator,    
    0, 
    CLSCTX_INPROC_SERVER, 
    IID_IWbemLocator, (LPVOID *) &pLoc); 

if (FAILED(hres)) 
{ 
    cout << "Failed to create IWbemLocator object. " 
     << "Err code = 0x" 
     << hex << hres << endl; 
    CoUninitialize(); 
    return 1;     // Program has failed. 
} 

// Step 4: --------------------------------------------------- 
// Connect to WMI through the IWbemLocator::ConnectServer method 

IWbemServices *pSvc = NULL; 

// Connect to the local root\cimv2 namespace 
// and obtain pointer pSvc to make IWbemServices calls. 
hres = pLoc->ConnectServer(
    _bstr_t(L"ROOT\\wmi"), 
    NULL, 
    NULL, 
    0, 
    NULL, 
    0, 
    0, 
    &pSvc 
); 

if (FAILED(hres)) 
{ 
    cout << "Could not connect. Error code = 0x" 
     << hex << hres << endl; 
    pLoc->Release();  
    CoUninitialize(); 
    return 1;    // Program has failed. 
} 

cout << "Connected to ROOT\\CIMV2 WMI namespace" << endl; 


// Step 5: -------------------------------------------------- 
// Set security levels for the proxy ------------------------ 

hres = 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 
); 

if (FAILED(hres)) 
{ 
    cout << "Could not set proxy blanket. Error code = 0x" 
     << hex << hres << endl; 
    pSvc->Release(); 
    pLoc->Release();  
    CoUninitialize(); 
    return 1;    // Program has failed. 
} 


/////////////////////////////////////////////////////////////////////////////////////////////////////////////// 
// set up to call the WmiSetBrightness Method 
BSTR MethodName = SysAllocString(L"WmiSetBrightness"); 
BSTR ClassName = SysAllocString(L"WmiMonitorBrightnessMethods"); 

IWbemClassObject* pClass = NULL; 
hres = pSvc->GetObject(ClassName, 0, NULL, &pClass, NULL); 

IWbemClassObject* pInParamsDefinition = NULL; 
hres = pClass->GetMethod(MethodName, 0, 
    &pInParamsDefinition, NULL); 

IWbemClassObject* pClassInstance = NULL; 
hres = pInParamsDefinition->SpawnInstance(0, &pClassInstance); 

VARIANT var1; 
VariantInit(&var1); 

V_VT(&var1) = VT_BSTR; 
V_BSTR(&var1) = SysAllocString(L"0"); 
hres = pClassInstance->Put(L"Timeout", 0, &var1, CIM_UINT32); //CIM_UINT64 

VARIANT var2; 
VariantInit(&var2); 

V_VT(&var2) = VT_BSTR; 
V_BSTR(&var2) = SysAllocString(L"30"); 
hres = pClassInstance->Put(L"Brightness", 0, &var2, CIM_UINT8); 

// Execute Method 
IWbemClassObject* pOutParams = NULL; 
hres = pSvc->ExecMethod(ClassName, MethodName, 0, 
NULL, pClassInstance, &pOutParams, NULL); 


if (FAILED(hres)) 
{ 
    cout << "Could not execute method. Error code = 0x" 
     << hex << hres << endl; 
    //VariantClear(&varCommand); 
    SysFreeString(ClassName); 
    SysFreeString(MethodName); 
    pClass->Release(); 
    pInParamsDefinition->Release(); 
    pOutParams->Release(); 
    pSvc->Release(); 
    pLoc->Release();  
    CoUninitialize(); 
    return 1;    // Program has failed. 
} 

// To see what the method returned, 
// use the following code. The return value will 
// be in &varReturnValue 
VARIANT varReturnValue; 
hres = pOutParams->Get(_bstr_t(L"ReturnValue"), 0, 
    &varReturnValue, NULL, 0); 


// Clean up 
//-------------------------- 
// VariantClear(&varCommand); 
VariantClear(&varReturnValue); 
SysFreeString(ClassName); 
SysFreeString(MethodName); 
pClass->Release(); 
pInParamsDefinition->Release(); 
pOutParams->Release(); 
pLoc->Release(); 
pSvc->Release(); 
CoUninitialize(); 
return 0; 
} 

Answer 1

Essayez ce qui est censé fonctionner par here information. Apparemment les docs sont trompeurs sur cette API.

VARIANT var1; 
VariantInit(&var1); 

V_VT(&var1) = VT_BSTR; 
V_BSTR(&var1) = SysAllocString(L"0"); 
hr = pClassInstance->Put(L"Timeout", 0, &var1, CIM_UINT32); //CIM_UINT64 

VARIANT var2; 
VariantInit(&var2); 

V_VT(&var2) = VT_BSTR; 
V_BSTR(&var2) = SysAllocString(L"30"); 
hr = pClassInstance->Put(L"Brightness", 0, &var2, CIM_UINT8); 

Answer 2

J'ai recherché sur Google des trucs avec le bouton droit de la souris dans votre code et en sélectionnant "Rechercher google pour ...".

Qui crachent le documentation de SWbemServices.ExecMethod.

Apparemment, le troisième argument, où vous spécifiez 0, peut être un SWbemObject spécifiant les paramètres d'entrée de la méthode.

Quoi qu'il en soit, étudiez la documentation. Essayez les choses (peut-être dans le script d'abord?).

Salutations & hth.