[英]C++ Getting WMI Array Data from the Local Computer
I am facing problem in retrieving array data from a WMI class using c++. 我在使用c ++从WMI类检索数组数据时遇到问题。
In the following link, http://msdn.microsoft.com/en-us/library/aa390423(v=vs.85).aspx , step 7 of the example shows us how to retrieve a string value of the wmi query ran. 在下面的链接http://msdn.microsoft.com/zh-cn/library/aa390423(v=vs.85).aspx中 ,示例的步骤7向我们展示了如何检索运行的wmi查询的字符串值。 However, I am currently facing an issue when the value returned from the query is an uint16 array.
但是,当查询返回的值是uint16数组时,我当前遇到问题。
eg. 例如。
Query: "Select ChassisTypes from Win32_SystemEnclosure" 查询:“从Win32_SystemEnclosure选择机箱类型”
Result: 结果:
_ GENUS : 2 _ 类别:2
_CLASS : Win32_SystemEnclosure _CLASS:Win32_SystemEnclosure
_ SUPERCLASS: _ SUPERCLASS:
_DYNASTY: _王朝:
_ RELPATH: _ RELPATH:
_PROPERTY_COUNT: 1 _PROPERTY_COUNT:1
_ DERIVATION: {} _ 派生:{}
_SERVER: _服务器:
_ NAMESPACE: _ NAMESPACE:
_PATH: _路径:
ChassisTypes: {3} 机箱类型:{3}
May I ask how do I actually process the result to retrieve the integer value of ChassisType from the array in this case? 请问在这种情况下,如何实际处理结果以从数组中检索ChassisType的整数值? Thank you!
谢谢!
To access the array values from a WMI property you can use the SafeArrayGetElement
, SafeArrayGetLBound and SafeArrayGetUBound methods. 要从WMI属性访问数组值,可以使用
SafeArrayGetElement
, SafeArrayGetLBound和SafeArrayGetUBound方法。
Try this sample 试试这个样本
VARIANT vtProp;
hr = pclsObj->Get(L"ChassisTypes", 0, &vtProp, 0, 0);// Uint16
if (!FAILED(hr))
{
if ((vtProp.vt==VT_NULL) || (vtProp.vt==VT_EMPTY))
wcout << "ChassisTypes : " << ((vtProp.vt==VT_NULL) ? "NULL" : "EMPTY") << endl;
else
if ((vtProp.vt & VT_ARRAY))
{
wcout << "ChassisTypes : " << endl;
long lLower, lUpper;
UINT32 Element = NULL;
SAFEARRAY *pSafeArray = vtProp.parray;
SafeArrayGetLBound(pSafeArray, 1, &lLower);
SafeArrayGetUBound(pSafeArray, 1, &lUpper);
for (long i = lLower; i <= lUpper; i++)
{
hres = SafeArrayGetElement(pSafeArray, &i, &Element);
wcout << Element<< endl;
}
SafeArrayDestroy(pSafeArray);
}
VariantClear(&vtProp);
pclsObj->Release();
pclsObj=NULL;
}
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