хм в чем может быть проблема
вот вызов функции
C++ (Qt)
future=QtConcurrent::run(this,&MainWindow::getnameusbdevice,hardwareserial);
watch.setFuture(future);
watch.waitForFinished();
QString gg=future.result();
вот сама функция
C++ (Qt)
QString MainWindow::getnameusbdevice(QString serial)
{
VARIANT vtProp2;
VARIANT vtProp4;
QString drl;
IWbemLocator *pLoc = NULL;
IWbemServices *pSvc= NULL;
IWbemClassObject *pclsObj = NULL;
//Создаем объект IWbemLocator
HRESULT hres;
hres = CoInitializeEx(0,COINIT_APARTMENTTHREADED);
if (FAILED(hres))
{
cout << "Failed to initialize COM library. Error code = 0x"
<< hex << hres << endl;
//return listdevice; // Program has failed.
}
hres = CoInitializeSecurity(
NULL,
-1, // COM authentication
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 << "security. Error code = 0x"
// << hex << hres << endl;
// //return listdevice; // Program has failed.
// }
hres = CoCreateInstance(
CLSID_WbemLocator,
0,
CLSCTX_INPROC_SERVER,
IID_IWbemLocator, (LPVOID *) &pLoc);
if (FAILED(hres))
{
cout << "create inst loc. Error code = 0x"
<< hex << hres << endl;
//return listdevice; // Program has failed.
}
hres = pLoc->ConnectServer(
_bstr_t(L"ROOT\\CIMV2"), // Object path of WMI namespace
NULL, // User name. NULL = current user
NULL, // User password. NULL = current
0, // Locale. NULL indicates current
NULL, // Security flags.
0, // Authority (for example, Kerberos)
0, // Context object
&pSvc // pointer to IWbemServices proxy
);
if (FAILED(hres))
{
cout << "connectserver error. Error code = 0x"
<< hex << hres << endl;
//return listdevice; // Program has failed.
}
IEnumWbemClassObject* pEnumerator = NULL;
ULONG uReturn = 0;
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 << "proxyblanket. Error code = 0x"
<< hex << hres << endl;
//return listdevice; // Program has failed.
}
hres = pSvc->ExecQuery(
bstr_t("WQL"),
bstr_t("SELECT * FROM Win32_DiskDrive"),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL,
&pEnumerator);
if (FAILED(hres))
{
cout << "execquery. Error code = 0x"
<< hex << hres << endl;
//return listdevice; // Program has failed.
}
// QString drl;
while (pEnumerator)
{
HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1,
&pclsObj, &uReturn);
if(0 == uReturn)
{
break;
}
hr=pclsObj->Get(L"PNPDeviceID", 0, &vtProp4, 0, 0);
hr=pclsObj->Get(L"Model",0,&vtProp2,0,0);
BSTR rr=vtProp4.bstrVal;
//сравниваем pnpdeviceid двух объектов
//
QString pnpdeviceid((QChar*)rr,::SysStringLen(rr));
//QString pnpp((QChar*)pnp,::SysStringLen(pnp));
//сравниваем два номера pnpdeviceid в случае если номер совпадает
//значит устройство является сменным носителем ифнормации
if (pnpdeviceid.contains(serial))
{
BSTR g=vtProp2.bstrVal;
QString friendlyname((QChar*)g,::SysStringLen(g));
drl=friendlyname;
}
}
if (pLoc)
pLoc->Release();
if (pSvc)
pSvc->Release();
if (pclsObj)
pclsObj->Release();
if (pEnumerator)
pEnumerator->Release();
CoUninitialize();
qDebug()<<"FFFFF="<<drl;
return drl;
}
не пойму в чем проблема в отладчике drl--не пустое значение
а после
C++ (Qt)
QString gg=future.result();
а в gg-пишется пустота
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