learn dot microsoft dot com    /en-us/windows/win32/api/wbemcli/nf-wbemcli-iwbemclassobject-get

这个页面下的例子代码，是错误的。

文档里写着只有Get()成功才能清理没初始化的变量v，这个代码无条件清理了v。

#include <iostream>
using namespace std;
#include <wbemidl.h>
#pragma comment(lib, "wbemuuid.lib")

//Assumes that pObj is defined as a pointer
// to an IWbemClassObject object.

VARIANT v;
BSTR strClassProp = SysAllocString(L"__CLASS");
HRESULT hr;
hr = pObj->Get(strClassProp, 0, &v, 0, 0);
SysFreeString(strClassProp);

// check the HRESULT to see if the action succeeded.

if (SUCCEEDED(hr) && (V_VT(&v) == VT_BSTR))
{
    wprintf(L"The class name is %s\n.", V_BSTR(&v));
}
else
{
    wprintf(L"Error in getting specified object\n");
}
VariantClear(&v);
--
FROM 222.130.138.*