I'm trying to implement a QT app for WMI Query. However, I'm stuck at error:
C2440: 'default argument': cannot convert from 'const wchar_t [ 1 ]' in WbemDisp.h.
On doing some research, I came to know that it is due to some header not following the strictString rule and that I should add
win32: QMAKE_CXXFLAGS_RELEASE -= -Zc:strictStrings
win32: QMAKE_CFLAGS_RELEASE -= -Zc:strictStrings
win32: QMAKE_CFLAGS -= -Zc:strictStrings
win32: QMAKE_CXXFLAGS -= -Zc:strictStrings
in .pro file. (Reference:StackOverflow)
Please find the snippet from my project file below:
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = qt_Trial_Test
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp
win32: QMAKE_CXXFLAGS_RELEASE -= -Zc:strictStrings
win32: QMAKE_CFLAGS_RELEASE -= -Zc:strictStrings
win32: QMAKE_CFLAGS -= -Zc:strictStrings
win32: QMAKE_CXXFLAGS -= -Zc:strictStrings
HEADERS += mainwindow.h
FORMS += mainwindow.ui
But it's still not working. Please guide me towards the right solution.
Snippet of mainwindow.cpp:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#define _WIN32_DCOM
#include <iostream>
using namespace std;
#include <comdef.h>
#include <comutil.h>
#include <Wbemidl.h>
#pragma comment(lib, "wbemuuid.lib")
// Typical WMI Query For C++
void MainWindow::Wmic()
{
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 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 << "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 root\cimv2 namespace with
// the current user and obtain pointer pSvc
// to make IWbemServices calls.
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 << "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 on 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.
}
// Step 6: --------------------------------------------------
// Use the IWbemServices pointer to make requests of WMI ----
// For example, get the name of the operating system
IEnumWbemClassObject* pEnumerator = NULL;
hres = pSvc->ExecQuery(
bstr_t("WQL"),
bstr_t("SELECT * FROM Win32_DiskDrive WHERE InterfaceType != 'USB'"),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL,
&pEnumerator);
if (FAILED(hres))
{
cout << "Query for operating system name failed."
<< " Error code = 0x"
<< hex << hres << endl;
pSvc->Release();
pLoc->Release();
CoUninitialize();
//return 1; // Program has failed.
}
// Step 7: -------------------------------------------------
// Get the data from the query in step 6 -------------------
IWbemClassObject *pclsObj = NULL;
ULONG uReturn = 0;
while (pEnumerator)
{
HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1,
&pclsObj, &uReturn);
if (0 == uReturn)
{
break;
}
VARIANT vtProp;
/************************************************/
wchar_t temp[1024];
/************************************************/
// Get the value of the Name property
hr = pclsObj->Get(L"InterfaceType", 0, &vtProp, 0, 0);
//wcout << " Interface Type : " << vtProp.bstrVal << endl;
VariantClear(&vtProp);
hr = pclsObj->Get(L"Caption", 0, &vtProp, 0, 0);
//wcout << " Caption : " << vtProp.bstrVal << endl;
VariantClear(&vtProp);
hr = pclsObj->Get(L"DeviceID", 0, &vtProp, 0, 0);
//wcout << " Device ID : " << vtProp.bstrVal << endl;
QString convertedBSTR((QChar*) vtProp.bstrVal, wcslen(vtProp.bstrVal));
ui->textEdit_3->setText(convertedBSTR);
//ui->textEdit_3->setText((const char*)_bstr_t(V_BSTR(&vtProp.bstrVal)));
ui->textEdit_3->append(": \n");
/***************************************************/
wcscpy(temp, vtProp.bstrVal);
/***************************************************/
VariantClear(&vtProp);
wstring ws(temp);
// your new String
string query(ws.begin(), ws.end());
query = "ASSOCIATORS OF {Win32_DiskDrive.DeviceID='" + query + "'} WHERE AssocClass = Win32_DiskDriveToDiskPartition";
IEnumWbemClassObject* pEnumerator1 = NULL;
hres = pSvc->ExecQuery(bstr_t("WQL"),bstr_t(query.c_str()),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL, &pEnumerator1);
if (FAILED(hres))
{
cout << "Query for Disk Partition failed."
<< " Error code = 0x"
<< hex << hres << endl;
pSvc->Release();
pLoc->Release();
CoUninitialize();
//return 1; // Program has failed.
}
IWbemClassObject *pclsObj1;
ULONG uReturn1 = 0;
while (pEnumerator1)
{
HRESULT hr1 = pEnumerator1->Next(WBEM_INFINITE, 1, &pclsObj1, &uReturn1);
if (0 == uReturn1)
{
break;
}
VARIANT vtProp1;
wchar_t temp1[1024];
hr1 = pclsObj1->Get(L"DeviceID", 0, &vtProp1, 0, 0);
//wcout << " Device ID : " << vtProp1.bstrVal << endl;
wcscpy(temp1, vtProp1.bstrVal);
VariantClear(&vtProp1);
wstring ws(temp1);
// your new String
string query1(ws.begin(), ws.end());
query1 = "ASSOCIATORS OF {Win32_DiskPartition.DeviceID='" + query1 + "'} WHERE AssocClass = Win32_LogicalDiskToPartition";
IEnumWbemClassObject* pEnumerator2 = NULL;
hres = pSvc->ExecQuery(bstr_t("WQL"),
bstr_t(query1.c_str()), WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL, &pEnumerator2);
if (FAILED(hres))
{
cout << "Query for Logical Disk failed."
<< " Error code = 0x"
<< hex << hres << endl;
pSvc->Release();
pLoc->Release();
CoUninitialize();
//return 1; // Program has failed.
}
IWbemClassObject *pclsObj2;
ULONG uReturn2 = 0;
while (pEnumerator2)
{
HRESULT hr2 = pEnumerator2->Next(WBEM_INFINITE, 1,
&pclsObj2, &uReturn2);
if (0 == uReturn2)
{
break;
}
VARIANT vtProp2;
wchar_t temp2[1024];
hr2 = pclsObj2->Get(L"Caption", 0, &vtProp2, 0, 0);
QString convertedBSTR((QChar*) vtProp2.bstrVal, wcslen(vtProp2.bstrVal));
ui->textEdit_3->append(convertedBSTR);
//ui->textEdit_3->append((const char*)_bstr_t(V_BSTR(&vtProp2.bstrVal)));
ui->textEdit_3->append("\t");
//wcout << " Caption : " << vtProp2.bstrVal << endl;
wcscpy(temp2, vtProp2.bstrVal);
VariantClear(&vtProp2);
pclsObj2->Release();
}
pclsObj1->Release();
}
ui->textEdit_3->append("\n");
pclsObj->Release();
}
// Cleanup
// ========
pSvc->Release();
pLoc->Release();
pEnumerator->Release();
CoUninitialize();
// Program successfully completed.
}
void MainWindow::on_pushButton_clicked()
{
Wmic();
}
