windows - Executing a WMI method from C++ fails with WBEM_E_INVALID_METHOD_PARAMETERS -


i'm trying call method wmi using c++. pnamespace->callmethod(..) fails error wbem_e_invalid_method_parameters (0x8004102f).

i'm trying call method from.. namespace: root\wmi class: clevo_get method: setkbled (static = false) in params: id: 0 / name: data / type: uint32 out params: none

mof: [wmimethodid(103), implemented, read, write, description("setkbled")] void setkbled([in, description("setkbled")] uint32 data);

this code, said before, "callmethod" function never works , returns 0x8004102f error. knows wrong?

#include <windows.h>   #include <iostream>   #include <string>  #include <wbemcli.h>    #pragma comment(lib, "wbemuuid.lib")    int main() {     iwbemlocator *plocator = null;     iwbemservices *pnamespace = 0;     iwbemclassobject * pclass = null;     iwbemclassobject * poutinst = null;     iwbemclassobject * pinclass = null;     iwbemclassobject * pininst = null;      bstr path = sysallocstring(l"root\\wmi");     bstr classpath = sysallocstring(l"clevo_get");     bstr methodname = sysallocstring(l"setkbled");     bstr argname = sysallocstring(l"data");      // initialize com , connect wmi.      hresult hr = coinitialize(0);     hr = coinitializesecurity(null, -1, null, null, rpc_c_authn_level_default,         rpc_c_imp_level_impersonate, null, eoac_none, null);     hr = cocreateinstance(clsid_wbemlocator, 0, clsctx_inproc_server,         iid_iwbemlocator, (lpvoid *)&plocator);     hr = plocator->connectserver(path, null, null, null, 0, null, null, &pnamespace);      // class object method definition.     hr = pnamespace->getobject(classpath, 0, null, &pclass, null);     std::cout << "namespace-class:: " << std::hex << hr << std::endl;      // input-argument class object ,      // create instance.     hr = pclass->getmethod(methodname, 0, &pinclass, null);     std::cout << "get method:: " << std::hex << hr << std::endl;     hr = pinclass->spawninstance(0, &pininst);     std::cout << "spawn instance:: " << std::hex << hr << std::endl;      // set property.     variant var;     var.vt = vt_i4;     var.ival = 4096;     //var.ival = std::stoul("0x00001000", null, 16);      hr = pininst->put(argname, 0, &var, 0);     std::cout << "add variable:: " << std::hex << hr << std::endl;     variantclear(&var);      // call method.     //hr = pnamespace->execmethod(l"clevo_get", l"setkbled", 0, null, null, null, null);     hr = pnamespace->execmethod(classpath, methodname, 0, null, pininst, null, null);     //hr = pnamespace->execmethod(classpath, methodname, 0, null, null, null, null);     std::cout << "exec result:: " << std::hex << hr << std::endl;      // free resources.     sysfreestring(path);     sysfreestring(classpath);     sysfreestring(methodname);     sysfreestring(argname);     pclass->release();     pininst->release();     pinclass->release();     plocator->release();     pnamespace->release();     couninitialize();       // wait finish     std::cout << "done! :)";     std::cin.ignore();      return 0; }

i'm trying achieve using c++ (this code snippet written in powershell , works) :

$clevo = get-wmiobject -query "select * clevo_get" -namespace "root\wmi" $clevo.setkbled( [convert]::touint32("00001000", 16)  )

hope can me. highly apretiated. thanks.


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