WMI ClearEventLog 清除日志时的问题

本人想通过 WMI 的 Win32_NTEventlogFile 的 ClearEventLog 方法清除应用程序日志，在XP系统编译通过并运行，没有错误提示，可是发现日志并未清除，请高人指教！谢谢！急！代码如下：#define _WIN32_DCOM
#include <iostream>
using namespace std ;
#include <windows.h>
#include <comdef.h>
#include <wbemcli.h>#pragma comment(lib, "Wbemuuid")int main(int argc,char**argv)
{
    IWbemLocator *pLocator = NULL;
    IWbemServices *pNamespace = 0;
    IWbemClassObject * pClass = NULL;
//    IWbemClassObject * pOutInst = NULL;
    IWbemClassObject * pInClass = NULL;
    IWbemClassObject * pInInst = NULL;
  
IWbemCallResult *pCallRes = NULL;
    IWbemClassObject *pObj = NULL;    BSTR path = SysAllocString(L"\\\\.\\ROOT\\CIMV2");
    BSTR ClassPath = SysAllocString(L"Win32_NTEventlogFile");
    BSTR MethodName = SysAllocString(L"ClearEventLog");
    BSTR ArgName = SysAllocString(L"ArchiveFileName");
//    BSTR Text;    // Initialize COM and connect to WMI.    HRESULT hr = CoInitialize(0);
    hr = CoCreateInstance(CLSID_WbemLocator,0,CLSCTX_INPROC_SERVER,IID_IWbemLocator,(LPVOID *) &pLocator);
    if SUCCEEDED(hr) 
{
    printf("WbemLocator OK!\n");
}
hr = pLocator->ConnectServer(path, NULL, NULL, NULL, 0, NULL, NULL, &pNamespace);
    if SUCCEEDED(hr) 
{
    printf("ConnectServer OK!\n");
}
else
{
IErrorInfo *pIErrorInfo; GetErrorInfo(0,&pIErrorInfo); BSTR desc; pIErrorInfo->GetDescription(&desc); std::wcout << desc << L"\n";
} // Get the class object for the method definition.    hr = pNamespace->GetObject(ClassPath, 0, NULL, &pClass, NULL);
    if SUCCEEDED(hr) 
{
    printf("GetObject OK!\n");
}
else
{
IErrorInfo *pIErrorInfo; GetErrorInfo(0,&pIErrorInfo); BSTR desc; pIErrorInfo->GetDescription(&desc); std::wcout << desc << L"\n";
}    // Get the input-argument class object and create an instance.    hr = pClass->GetMethod(MethodName, 0, &pInClass, NULL); 
    if SUCCEEDED(hr) 
{
    printf("GetMethod OK!\n");
}
else
{
IErrorInfo *pIErrorInfo; GetErrorInfo(0,&pIErrorInfo); BSTR desc; pIErrorInfo->GetDescription(&desc); std::wcout << desc << L"\n";
}    hr = pInClass->SpawnInstance(0, &pInInst);
    if SUCCEEDED(hr) 
{
    printf("SpawnInstance OK!\n");
}
else
{
IErrorInfo *pIErrorInfo; GetErrorInfo(0,&pIErrorInfo); BSTR desc; pIErrorInfo->GetDescription(&desc); std::wcout << desc << L"\n";
}    // Set the property.
// BSTR Filename=L"C:\WINDOWS\system32\config\OSession.evt";
    VARIANT var;
    var.vt = VT_BSTR;
    var.bstrVal= SysAllocString(L"C:\\WINNT\\system32\\config\\AppEvent.Evt");
    hr = pInInst->Put(ArgName, 0, &var, 0);
    if SUCCEEDED(hr) 
{
    printf("Put OK!\n");
}
else
{
IErrorInfo *pIErrorInfo; GetErrorInfo(0,&pIErrorInfo); BSTR desc; pIErrorInfo->GetDescription(&desc); std::wcout << desc << L"\n";
}    VariantClear(&var);    // Call the method.//    hr = pNamespace->ExecMethod(ClassPath, MethodName, 0, NULL, 
//            pInInst, &pOutInst, NULL);    hr = pNamespace->ExecMethod(ClassPath,MethodName,WBEM_FLAG_RETURN_IMMEDIATELY,NULL,pInInst,NULL,&pCallRes);
//    hr = pNamespace->ExecMethod(ClassPath,MethodName,NULL,NULL,pInInst,NULL,&pCallRes);
    if (WBEM_S_NO_ERROR==hr) 
{
    printf("ExecMethod OK!\n");
}
else
{
IErrorInfo *pIErrorInfo; GetErrorInfo(0,&pIErrorInfo); BSTR desc; pIErrorInfo->GetDescription(&desc); std::wcout << desc << L"\n";
} while (true)
    {
        LONG lStatus = 0;
        HRESULT hRes = pCallRes->GetCallStatus(0, &lStatus);
        if ((hRes == WBEM_S_NO_ERROR))
            break;
        if ((hRes == WBEM_S_TIMEDOUT))
            continue;
    }    hr = pCallRes->GetResultObject(WBEM_INFINITE, &pObj);/*    if (hr)
    {
        pCallRes->Release();
        return 1;
    }
*/
/*    VARIANT varReturnValue;
VariantInit(&varReturnValue);
    hr = pObj->Get(_bstr_t(L"ReturnValue"),0,&varReturnValue,NULL,0);
//    hr = pObj->Get(L"ReturnValue",0,&varReturnValue,NULL,0);    cout << varReturnValue.lVal << endl;
*/
IErrorInfo *pIErrorInfo;GetErrorInfo(0,&pIErrorInfo);BSTR desc;pIErrorInfo->GetDescription(&desc);std::wcout << desc << L"\n";    // property "ReturnValue" and the returned string is in the 
    // property "sOutArg".    //hr = pOutInst->GetObjectText(0, &Text);
    //printf("\nThe object text is:\n%S", Text);    // Free up resources.    SysFreeString(path);
    SysFreeString(ClassPath);
    SysFreeString(MethodName);
    SysFreeString(ArgName);
//    SysFreeString(Text);
    pCallRes->Release();    pClass->Release();
    pInInst->Release();
    pInClass->Release();
    //pOutInst->Release();
    pLocator->Release();
    pNamespace->Release();
    CoUninitialize();
    printf("Terminating normally\n");    return 0;
    // Program successfully completed.
}