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8.8

WMI in C++ Builder problems

Asked by CSD-GW in C++ Builder, Windows Management Instrumentation (WMI), C++ Programming Language

Tags: WMI, C++, BCB, Borland CBuilder

I have tried to use code from the MS website http://msdn.microsoft.com/en-us/library/aa390423(VS.85).aspx to try and get a list of running processes. I am having two problems. Firstly, the

while (pEnum)
{
.
.
.
}

never exits. I get a list of tasks, and then the final task is constantly repeated.

If I put a count variable in and return from the function (the commented code in the example), then when the function exits, a debugger exception is trown, and I end up with a machine code window sitting at ntdll.DbgBreakPoint
If I place a user breakpoint at the CoUninitialize() line, I stop there normally (when the break line is included), but when I single step out of the function, the above exception is thrown.
Running outside the environment, no exception is thrown, but the iterator never exits as described above.
I am using BCB V6 and OS is XP Pro.

Any guidance as to what I am doing wrong would be greatly appreciated.
I have not been able to try the code from the MS website in Visual Studio.

A possibly (probably) totally unrelated issue is that every time I change and comile/link the code I get an error:
[Linker Fatal Error] Fatal: General error in link set
I simple do it again and it is fine. this only seems to affect this project, others compile normally each time!?!
Thanks.

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             void __fastcall TForm1::Button1Click(TObject *Sender)
{
CoUninitialize();
HRESULT hr;
hr = CoInitializeEx(0, COINIT_MULTITHREADED);
if (FAILED(hr))
        {
        Memo1->Lines->Add("Failed to initialise COM library");
 
        return;
        }
hr=CoInitializeSecurity(NULL,
                        -1,
                        NULL,
                        NULL,
                        RPC_C_AUTHN_LEVEL_DEFAULT,
                        RPC_C_IMP_LEVEL_IMPERSONATE,
                        NULL,
                        EOAC_NONE,
                        NULL);
if (FAILED(hr))
        {
        Memo1->Lines->Add("Failed to initialise security");
        CoUninitialize();
        return;
        }
IWbemLocator *pLoc =0;
hr=CoCreateInstance(CLSID_WbemLocator,0,CLSCTX_INPROC_SERVER,IID_IWbemLocator,(LPVOID *) &pLoc);
if (FAILED(hr))
        {
        Memo1->Lines->Add("Failed to create IWbemLocator object");
        CoUninitialize();
        return;
        }
IWbemServices *pSvc = 0;
hr=pLoc->ConnectServer(BSTR(L"ROOT\\CIMV2"),
                                NULL,
                                NULL,
                                0,
                                NULL,
                                0,
                                0,
                                &pSvc);
if (FAILED(hr))
        {
        Memo1->Lines->Add("Failed to connect");
        CoUninitialize();
        return;
        }
hr=CoSetProxyBlanket(pSvc,
                        RPC_C_AUTHN_WINNT,
                        RPC_C_AUTHZ_NONE,
                        NULL,
                        RPC_C_AUTHN_LEVEL_CALL,
                        RPC_C_IMP_LEVEL_IMPERSONATE,
                        NULL,
                        EOAC_NONE);
if (FAILED(hr))
        {
        Memo1->Lines->Add("Failed to set proxy blanket");
        CoUninitialize();
        return;
        }
IEnumWbemClassObject * pEnum = NULL;
WideString ws1,ws2;;
ws1=L"WQL";
ws2=L"SELECT * FROM Win32_Process";
 
hr=pSvc->ExecQuery(L"WQL" ,L"SELECT * FROM Win32_Process",
                        WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
                                NULL,&pEnum);
 
if (FAILED(hr))
        {
        Memo1->Lines->Add("Failed to query");
        CoUninitialize();
        return;
        }
IWbemClassObject * pclsObj;
ULONG uReturn=0;
pEnum->Reset();
//int i=0;
while (pEnum)
        {
//        i++;
//        if (i>10)
//                {
//                break;
//                }
        hr=pEnum->Next(WBEM_INFINITE,1,&pclsObj,&uReturn);
        if (FAILED(hr))
                {
                break;
                }
        VARIANT  vt1;
        AnsiString asValue;
        hr=pclsObj->Get(L"CommandLine",0,&vt1,0,0);
        if (FAILED(hr))
                {
                break;
                }
 
        Memo1->Lines->Add(vt1.bstrVal);
        VariantClear(&vt1);
        }
 
CoUninitialize(); //breakpoint here is fine!
}

           
         

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WMI in C++ Builder problems

Asked by CSD-GW in C++ Builder, Windows Management Instrumentation (WMI), C++ Programming Language

Tags: WMI, C++, BCB, Borland CBuilder

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