@Robins.Lee The ExecMethod alway return WBEM_E_INVALID_METHOD_PARAMETERS because you pass the class name for the first parameter, but it needs a valid the object path of the object for which the method is executed.
You only obtained this class, not the object of this class. You can use "SELECT * FROM WmiMonitorDescriptorMethods" to get the pEnumerator of the class object, then get the path of each object, and then call WmiGetMonitorRawEEdidV1Block for each object.
IEnumWbemClassObject* pEnumerator = NULL;
wstring strQuery = L"SELECT * FROM WmiMonitorDescriptorMethods";
hres = pSvc->ExecQuery(BSTR(L"WQL"), BSTR(strQuery.c_str()),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &pEnumerator);
ULONG uReturn = 0;
while (pEnumerator)
{
IWbemClassObject* pclsObj = NULL;
UINT32 bit = 0;
hres = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);
if (0 == uReturn || FAILED(hres))
break;
VARIANT var;
pclsObj->Get(L"__PATH", 0, &var, NULL, NULL);
...
hres = pSvc->ExecMethod(var.bstrVal, MethodName, 0, NULL, pClassInstance, &pOutParams, NULL);
...
}
The following sample works for me:
#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 --------------------------
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
);
//hr = CoInitializeSecurity(
// NULL,
// -1,
// NULL,
// NULL,
// RPC_C_AUTHN_LEVEL_DEFAULT,
// RPC_C_IMP_LEVEL_IMPERSONATE,
// NULL,
// EOAC_NONE,
// NULL);
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);
// CoCreateInstance(
// CLSID_WbemLocator,
// 0,
// CLSCTX_INPROC_SERVER,
// IID_IWbemLocator, (LPVOID *) &m_pWmiLoc);
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\\CIMV2"),
_bstr_t(L"ROOT\\WMI"),
NULL,
NULL,
0,
NULL,
0,
0,
&pSvc
);
//hres = m_pWmiLoc->ConnectServer(
// bstrNamespace,
// NULL,
// NULL,
// 0,
// NULL,
// 0,
// 0,
// &m_pWmiServ);
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;
cout << "Connected to ROOT\\WMI 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
);
//hres = CoSetProxyBlanket(
// m_pWmiServ,
// RPC_C_AUTHN_WINNT,
// RPC_C_AUTHZ_NONE,
// NULL,
// RPC_C_AUTHN_LEVEL_CALL,
// RPC_C_IMP_LEVEL_IMPERSONATE,
// NULL,
// EOAC_NONE);
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.
}
// Step 6: --------------------------------------------------
printf("Step 6\n");
// Use the IWbemServices pointer to make requests of WMI ----
// set up to call the Win32_Process::Create method
//BSTR MethodName = SysAllocString(L"Create");
//BSTR ClassName = SysAllocString(L"Win32_Process");
BSTR MethodName = SysAllocString(L"WmiGetMonitorRawEEdidV1Block");
BSTR ClassName = SysAllocString(L"WmiMonitorDescriptorMethods");
#if 0
//-------need Add------------------------------------------------
DWORD nReturned;
IEnumWbemClassObject* m_ppiWmiEnum = NULL;
/*
HRESULT CAccessWmi::EnumInstances(CString& csInstName, OUT IEnumWbemClassObject** ppiWmiEnum)
{
if (NULL == ppiWmiEnum)
return E_INVALIDARG;
BSTR bstrObjectName = SysAllocString(csInstName.GetBuffer());
HRESULT hr = m_pWmiServ->CreateInstanceEnum( bstrObjectName,
WBEM_FLAG_RETURN_IMMEDIATELY | WBEM_FLAG_FORWARD_ONLY,
NULL,
ppiWmiEnum);
if (bstrObjectName)
SysFreeString(bstrObjectName);
return hr;
}
*/
hres = pSvc->CreateInstanceEnum(ClassName,
WBEM_FLAG_RETURN_IMMEDIATELY | WBEM_FLAG_FORWARD_ONLY,
NULL,
&m_ppiWmiEnum);
if (FAILED(hres))
{
pSvc->Release();
pLoc->Release();
CoUninitialize();
printf("CreateInstanceEnum err\n");
}
else
{
printf("CreateInstanceEnum OK\n");
}
hres = m_ppiWmiEnum->Next(WBEM_INFINITE, 1, &pClass, &nReturned);
if (hres != WBEM_S_NO_ERROR)
{
printf("m_ppiWmiEnum->Next err\n");
}
else
{
printf("m_ppiWmiEnum->Next ok\n");
}
//--------------------------------------------------------------
#endif
IEnumWbemClassObject* pEnumerator = NULL;
wstring strQuery = L"SELECT * FROM WmiMonitorDescriptorMethods";
hres = pSvc->ExecQuery(BSTR(L"WQL"), BSTR(strQuery.c_str()),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &pEnumerator);
ULONG uReturn = 0;
while (pEnumerator)
{
IWbemClassObject* pclsObj = NULL;
UINT32 bit = 0;
hres = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);
if (0 == uReturn || FAILED(hres))
break;
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 var;
pclsObj->Get(L"__PATH", 0, &var, NULL, NULL);
VARIANT varCommand = { 0 };
//varCommand.vt = VT_BSTR;
//varCommand.bstrVal = _bstr_t(L"notepad.exe");
varCommand.vt = VT_UI1;
varCommand.bVal = 0;
// Store the value for the in parameters
//hres = pClassInstance->Put(L"CommandLine", 0, &varCommand, 0);
//wprintf(L"The command is: %s\n", V_BSTR(&varCommand));
hres = pClassInstance->Put(L"BlockId", 0, &varCommand, 0);
wprintf(L"The BlockId is: %d\n", V_UI1(&varCommand));
// Execute Method
IWbemClassObject* pOutParams = NULL;
hres = pSvc->ExecMethod(var.bstrVal, 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();
pClassInstance->Release();
pInParamsDefinition->Release();
pOutParams->Release();
pSvc->Release();
pLoc->Release();
CoUninitialize();
return 1; // Program has failed.
}
VARIANT varReturnValue;
//hres = pOutParams->Get(_bstr_t(L"ReturnValue"), 0, &varReturnValue, NULL, 0);
hres = pOutParams->Get(_bstr_t(L"BlockType"), 0, &varReturnValue, NULL, 0);
if (FAILED(hres))
{
printf("BlockType err\n");
}
else
{
printf("BlockType:%d\n", varReturnValue.bVal);
}
// Clean up
//--------------------------
VariantClear(&var);
VariantClear(&varCommand);
VariantClear(&varReturnValue);
pClass->Release();
pClassInstance->Release();
pInParamsDefinition->Release();
pOutParams->Release();
pclsObj->Release();
}
if (FAILED(hres))
{
printf("pClass->GetMethod err\n");
}
else
{
printf("pClass->GetMethod ok\n");
}
//--------------------------
SysFreeString(ClassName);
SysFreeString(MethodName);
pLoc->Release();
pSvc->Release();
pEnumerator->Release();
CoUninitialize();
return 0;
}
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