返回WBEM_E_NOT_FOUND错误的IWbemClassObject->Put方法

Question

我有一个C++代码块，在其中我试图调用一个公司指定的WMI方法。在试图构建表示参数的IWbemClassObject时，我会得到一条WBEM_E_NOT_FOUND错误消息。根据MSDN站点，这不应该是一个有效的HRESULT。

/* pSvc has been setup already, all calls returned S_OK. Ugly Debugging statements have been sprinkled throughout the code. */
HRESULT hres;
IWbemClassObject* DataInClass;
IWbemClassObject* DataOutClass;
IWbemClassObject* CallingObject;
/* Grab the types of parameters we will be using for Input and Output.
DataIn and DataOut are set to the classes we will  be using */
hres = pSvc->GetObject(
    _bstr_t("ObjectName"),
    WBEM_FLAG_RETURN_WBEM_COMPLETE,
    NULL,
    &CallingObject,
    NULL
    );
cout << "GetObject:" << hres << endl;

string function_type = "MethodName";

hres = CallingObject->GetMethod(
    _bstr_t(function_type.c_str()),
    0,
    &DataInClass,
    &DataOutClass
    );
cout << "GetMethod:" << hres << endl;
if(hres == WBEM_S_NO_ERROR) cout << "No Error" << endl;
if(hres == WBEM_E_NOT_FOUND) cout << "Not found" << endl;
if(hres == WBEM_E_OUT_OF_MEMORY) cout << "OOM" << endl;
/* Create an instance of DataIn and DataOut and populate the parameters */
IWbemClassObject* DataIn;
IWbemClassObject* DataOut;
hres = DataInClass->SpawnInstance(0, &DataIn);
hres = DataOutClass->SpawnInstance(0, &DataOut);

/* NOTE: up to this point, all HRESULTS have been returning S_OK. I'm getting appropriate pointer values, so it appears that the code can connect to WMI. */

/* Set all of the parameters needed for DataIn */
VARIANT var;
// Active: true
_variant_t varActive(true);
var = varActive.Detach();
hres = DataIn->Put(_bstr_t("Active"), 0, &var, 0);
VariantClear(&var);
switch(hres){
case WBEM_E_FAILED: cout << "Failed" << endl; break;
case WBEM_E_INVALID_PARAMETER: cout << "ip" << endl; break;
case WBEM_E_INVALID_PROPERTY_TYPE: cout << "ipt" << endl; break;
case WBEM_E_OUT_OF_MEMORY: cout << "oom" << endl; break;
case WBEM_E_TYPE_MISMATCH: cout << "typem" << endl; break;
case WBEM_S_NO_ERROR: cout << "ok" << endl; break;
case WBEM_E_NOT_FOUND: cout << "WHAT!?" << endl; break; // This is the error code being returned from DataIn->Put
default: cout << "nota?" << endl; break;
}

有人知道为什么会发生这种事吗?我怎么才能解决呢？

先谢谢你，扎克

Answer 1

通常，这个错误会产生"GET“命令。在大多数情况下，错误的特殊原因取决于您试图访问的WMI类。例如，对于试图连接到性能计数器时何时返回此错误，WMIDiag有如下说明：

当WMI性能类丢失时(即'Win32_PerfRawData_TermService_TerminalServices')，通常是因为WMI类提供程序缺乏缓冲区刷新，公开WMI性能counters.You可以使用以下命令刷新WMI类提供程序缓冲区：‘WINMGMT.EXE /SYNCPERF’

在其他情况下，此错误似乎最常见是由损坏的存储库引起的。有关示例，请参阅这 MS KB文章。

由于您提到了“公司指定的”WMI方法，我假设您已经注册了自己的WMI提供程序。在我重新构建存储库之前，我会怀疑这个提供程序没有在WMI中正确注册。

你问这个问题已经快一年了，我想你大概想明白了。如果是这样的话，我想社区会很感激你在这里发布你的结果，这样其他用户就可以从中受益。