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* os_win32/wmiquery.cpp
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* Home page of code is: http://www.smartmontools.org
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* Copyright (C) 2011-13 Christian Franke
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* SPDX-License-Identifier: GPL-2.0-or-later
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#define _WIN32_WINNT WINVER
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const char * wmiquery_cpp_cvsid = "$Id: wmiquery.cpp 4760 2018-08-19 18:45:53Z chrfranke $"
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/////////////////////////////////////////////////////////////////////////////
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com_bstr::com_bstr(const char * str)
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int sz = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, str, -1, (LPWSTR)0, 0);
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m_bstr = SysAllocStringLen((OLECHAR*)0, sz-1);
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return; // throw std::bad_alloc
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MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, str, -1, m_bstr, sz);
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bool com_bstr::to_str(const BSTR & bstr, std::string & str)
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int sz = WideCharToMultiByte(CP_ACP, 0, bstr, -1, (LPSTR)0, 0, (LPCSTR)0, (LPBOOL)0);
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char * buf = new char[sz];
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WideCharToMultiByte(CP_ACP, 0, bstr, -1, buf, sz, (LPCSTR)0, (LPBOOL)0);
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/////////////////////////////////////////////////////////////////////////////
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std::string wbem_object::get_str(const char * name) /*const*/
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VARIANT var; VariantInit(&var);
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if (m_intf->Get(com_bstr(name), 0L, &var, (CIMTYPE*)0, (LPLONG)0) /* != WBEM_S_NO_ERROR */)
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if (var.vt == VT_BSTR)
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com_bstr::to_str(var.bstrVal, s);
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/////////////////////////////////////////////////////////////////////////////
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bool wbem_enumerator::next(wbem_object & obj)
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HRESULT rc = m_intf->Next(5000 /*5s*/, 1 /*count*/, obj.m_intf.replace(), &n);
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if (FAILED(rc) || n != 1)
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/////////////////////////////////////////////////////////////////////////////
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const CLSID xCLSID_WbemLocator = {0x4590f811, 0x1d3a, 0x11d0, {0x89, 0x1f, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24}};
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const IID xIID_IWbemLocator = {0xdc12a687, 0x737f, 0x11cf, {0x88, 0x4d, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24}};
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bool wbem_services::connect()
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// Init COM during first call.
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static HRESULT init_rc = -1;
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static bool init_tried = false;
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init_rc = CoInitialize((LPVOID)0);
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if (!(init_rc == S_OK || init_rc == S_FALSE))
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com_intf_ptr<IWbemLocator> locator;
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HRESULT rc = CoCreateInstance(xCLSID_WbemLocator, (LPUNKNOWN)0,
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CLSCTX_INPROC_SERVER, xIID_IWbemLocator, (LPVOID*)locator.replace());
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// Set timeout flag if supported.
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OSVERSIONINFOA ver; ver.dwOSVersionInfoSize = sizeof(ver);
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if (GetVersionExA(&ver) && ver.dwPlatformId == VER_PLATFORM_WIN32_NT
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&& ( ver.dwMajorVersion >= 6 // Vista
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|| (ver.dwMajorVersion == 5 && ver.dwMinorVersion >= 1))) // XP
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flags = WBEM_FLAG_CONNECT_USE_MAX_WAIT; // return in 2min or less
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// Connect to local server.
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rc = locator->ConnectServer(com_bstr("\\\\.\\root\\cimv2"),
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(BSTR)0, (BSTR)0, (BSTR)0, // User, Password, Locale
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flags, (BSTR)0, (IWbemContext*)0, m_intf.replace());
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// Set authentication information,
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rc = CoSetProxyBlanket(m_intf.get(), RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE,
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(OLECHAR*)0, RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE,
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(RPC_AUTH_IDENTITY_HANDLE*)0, EOAC_NONE);
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bool wbem_services::vquery(wbem_enumerator & result, const char * qstr, va_list args) /*const*/
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vsnprintf(qline, sizeof(qline), qstr, args);
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qline[sizeof(qline)-1] = 0;
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HRESULT rc = m_intf->ExecQuery(
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com_bstr("WQL"), com_bstr(qline),
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WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
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(IWbemContext*)0, result.m_intf.replace());
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bool wbem_services::vquery1(wbem_object & obj, const char * qstr, va_list args) /*const*/
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wbem_enumerator result;
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if (!vquery(result, qstr, args))
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if (!result.next(obj))
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if (result.next(peek))
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bool wbem_services::query(wbem_enumerator & result, const char * qstr, ...) /*const*/
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va_list args; va_start(args, qstr);
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bool ok = vquery(result, qstr, args);
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bool wbem_services::query1(wbem_object & obj, const char * qstr, ...) /*const*/
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va_list args; va_start(args, qstr);
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bool ok = vquery1(obj, qstr, args);