我在MSDN网站上找到了一些WMI C ++应用程序示例。
我已尝试过以下链接的代码
http://msdn.microsoft.com/en-us/library/aa390423%28v=VS.85%29.aspx
当我复制并运行应用程序作为win32控制台应用程序时，它运行良好。
与Qt应用程序相同的代码，
当我使用QApplication anApplication（argc，argv）;在我的代码中，它无法正常工作
但是如果我使用QCroreApplication anApplication（argc，argv）;它正在运作
向我显示错误，例如“当我将QCroreApplication更改为QApplication时，下面的源代码不起作用，并且给出了像”无法初始化COM库“这样的错误。错误代码= 0x80010106“
任何建议或帮助
#define _WIN32_DCOM
#include <iostream>
using namespace std;
#include <comdef.h>
#include <Wbemidl.h>
# pragma comment(lib, "wbemuuid.lib")
// Qt Includes
#include <QtCore>
#include <QtGui>
//----------------------------------------------------------------------------
// Main Function
int main( int a_argc, char *a_argv[] )
//************************************
{
// initialize the application
QApplication anapplication( a_argc, a_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 --------------------------
// Note: If you are using Windows 2000, you need to specify -
// the default authentication credentials for a user by using
// a SOLE_AUTHENTICATION_LIST structure in the pAuthList ----
// parameter of CoInitializeSecurity ------------------------
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 (e.g. 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_USBControllerDevice"),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL,
&pEnumerator);
//ExecQuery(L"WQL", L"SELECT * FROM Win32_LogicalDisk", WBEM_FLAG_FORWARD_ONLY, NULL, &iter);
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;
ULONG uReturn = 0;
while (pEnumerator)
{
HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1,
&pclsObj, &uReturn);
if(FAILED(hr)||0 == uReturn)
{
break;
}
VARIANT vtProp;
// Get the value of the Name property
/*hr = pclsObj->Get(L"VolumeName", 0, &vtProp, 0, 0);
wcout << " VolumeName : " << vtProp.bstrVal << endl;
VariantClear(&vtProp);*/
if (FAILED(pclsObj->Get(L"Antecedent", 0, &vtProp, 0, 0)))
{
cout<<"The specified property is not found."<<endl;
}
else
{
wcout <<vtProp.bstrVal << endl;
}
pclsObj->Release();
}
// Cleanup
// ========
pSvc->Release();
pLoc->Release();
pEnumerator->Release();
// pclsObj->Release();
CoUninitialize();
// return 0; // Program successfully completed.
//execute the application
int anInt = anapplication.exec();
return anInt;
}
//-----------------------------------------------------------------------------
答案 0 :(得分：5)
您收到的错误是由于COM已经初始化。 QApplication在其构造函数中调用OleInitialize，但QCoreApplication不会，因此当您使用QApplication时，您会收到错误0x80010106（RPC_E_CHANGED_MODE）。有关进一步阅读，请参阅CoInitializeEx的文档。以下article应提供更多见解。
答案 1 :(得分：1)
首先我使用了这段代码
hres = CoInitializeEx(0, COINIT_MULTITHREADED);
if (hres == RPC_E_CHANGED_MODE) {
OleUninitialize();
hres = CoInitializeEx(0, COINIT_MULTITHREADED);
}
当我收到错误“无法初始化COM库（0x80010106）
时我只是调用OleUninitialize来处理QApplication中的OleInitialize（），但这可能会破坏某些qt功能。
我发现最好的是使用COINIT_APARTMENTTHREADED标志进行CoInitializeEx
MSDN
通常，创建窗口的线程应使用COINIT_APARTMENTTHREADED标志，其他线程应使用COINIT_MULTITHREADED。但是，某些COM组件需要特定的线程模型。 MSDN文档应告诉您何时出现这种情况。
对我来说这是一个黑魔法，但它帮助了我