2014-02-17 34 views
0

根據此鏈接WMI Architecture,WMI提供程序由DLL文件和託管對象格式(Managed Object Format,MOF)文件組成。假設我想查詢Win32_BIOS類的信息,並知道此類的提供者由Cimwin32.dll和Cimwin32.mof組成,那麼如何通過Winmgmt服務查詢此類的信息。直接通過Winmgmt服務查詢WMI提供程序

回答

1

WMI提供以下接口:

  • WMI腳本API
  • 本地C++ API
  • 類型在System.Management .NET Framework類庫

See also: Creating WMI Clients

對於WinAPI,WMI是簡單的COM。所以你只需要使用COM接口。我不知道這是正式支持,不使用WMI MGT服務的任何記錄API的...

一個例子可以在這裏找到:Example: Getting WMI Data from the Local Computer

這裏是一個工作示例:

#define _WIN32_DCOM 
#include <iostream> 
using namespace std; 
#include <comdef.h> 
#include <Wbemidl.h> 

# pragma comment(lib, "wbemuuid.lib") 

int main(int argc, char **argv) 
{ 
    HRESULT hres; 

    // Step 1: -------------------------------------------------- 
    // Initialize COM. ------------------------------------------ 

    hres = CoInitializeEx(0, COINIT_MULTITHREADED); 
    if (FAILED(hres)) 
    { 
     cout << "Failed to initialize COM library. Error code = 0x" 
      << hex << hres << endl; 
     return 1;     // Program has failed. 
    } 

    // Step 2: -------------------------------------------------- 
    // Set general COM security levels -------------------------- 
    // Note: If you are using Windows 2000, you need to specify - 
    // the default authentication credentials for a user by using 
    // a SOLE_AUTHENTICATION_LIST structure in the pAuthList ---- 
    // parameter of CoInitializeSecurity ------------------------ 

    hres = CoInitializeSecurity(
     NULL, 
     -1,       // COM authentication 
     NULL,      // Authentication services 
     NULL,      // Reserved 
     RPC_C_AUTHN_LEVEL_DEFAULT, // Default authentication 
     RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation 
     NULL,      // Authentication info 
     EOAC_NONE,     // Additional capabilities 
     NULL       // Reserved 
     ); 


    if (FAILED(hres)) 
    { 
     cout << "Failed to initialize security. Error code = 0x" 
      << hex << hres << endl; 
     CoUninitialize(); 
     return 1;     // Program has failed. 
    } 

    // Step 3: --------------------------------------------------- 
    // Obtain the initial locator to WMI ------------------------- 

    IWbemLocator *pLoc = NULL; 

    hres = CoCreateInstance(
     CLSID_WbemLocator, 
     0, 
     CLSCTX_INPROC_SERVER, 
     IID_IWbemLocator, (LPVOID *) &pLoc); 

    if (FAILED(hres)) 
    { 
     cout << "Failed to create IWbemLocator object." 
      << " Err code = 0x" 
      << hex << hres << endl; 
     CoUninitialize(); 
     return 1;     // Program has failed. 
    } 

    // Step 4: ----------------------------------------------------- 
    // Connect to WMI through the IWbemLocator::ConnectServer method 

    IWbemServices *pSvc = NULL; 

    // Connect to the root\cimv2 namespace with 
    // the current user and obtain pointer pSvc 
    // to make IWbemServices calls. 
    hres = pLoc->ConnectServer(
     _bstr_t(L"ROOT\\CIMV2"), // Object path of WMI namespace 
     NULL,     // User name. NULL = current user 
     NULL,     // User password. NULL = current 
     0,      // Locale. NULL indicates current 
     NULL,     // Security flags. 
     0,      // Authority (e.g. Kerberos) 
     0,      // Context object 
     &pSvc     // pointer to IWbemServices proxy 
     ); 

    if (FAILED(hres)) 
    { 
     cout << "Could not connect. Error code = 0x" 
      << hex << hres << endl; 
     pLoc->Release(); 
     CoUninitialize(); 
     return 1;    // Program has failed. 
    } 

    cout << "Connected to ROOT\\CIMV2 WMI namespace" << endl; 


    // Step 5: -------------------------------------------------- 
    // Set security levels on the proxy ------------------------- 

    hres = CoSetProxyBlanket(
     pSvc,      // Indicates the proxy to set 
     RPC_C_AUTHN_WINNT,   // RPC_C_AUTHN_xxx 
     RPC_C_AUTHZ_NONE,   // RPC_C_AUTHZ_xxx 
     NULL,      // Server principal name 
     RPC_C_AUTHN_LEVEL_CALL,  // RPC_C_AUTHN_LEVEL_xxx 
     RPC_C_IMP_LEVEL_IMPERSONATE, // RPC_C_IMP_LEVEL_xxx 
     NULL,      // client identity 
     EOAC_NONE     // proxy capabilities 
    ); 

    if (FAILED(hres)) 
    { 
     cout << "Could not set proxy blanket. Error code = 0x" 
      << hex << hres << endl; 
     pSvc->Release(); 
     pLoc->Release(); 
     CoUninitialize(); 
     return 1;    // Program has failed. 
    } 

    // Step 6: -------------------------------------------------- 
    // Use the IWbemServices pointer to make requests of WMI ---- 

    // For example, get the name of the operating system 
    IEnumWbemClassObject* pEnumerator = NULL; 
    hres = pSvc->ExecQuery(
     bstr_t("WQL"), 
     bstr_t("SELECT * FROM Win32_BIOS"), 
     WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
     NULL, 
     &pEnumerator); 

    if (FAILED(hres)) 
    { 
     cout << "Query for Win32_BIOS failed." 
      << " Error code = 0x" 
      << hex << hres << endl; 
     pSvc->Release(); 
     pLoc->Release(); 
     CoUninitialize(); 
     return 1;    // Program has failed. 
    } 

    // Step 7: ------------------------------------------------- 
    // Get the data from the query in step 6 ------------------- 

    IWbemClassObject *pclsObj; 
    ULONG uReturn = 0; 

    while (pEnumerator) 
    { 
     HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, 
      &pclsObj, &uReturn); 

     if(0 == uReturn) 
     { 
      break; 
     } 

     VARIANT vtProp; 
     VariantInit(&vtProp); 

     // Get the value of the Name property 
     hr = pclsObj->Get(L"Name", 0, &vtProp, 0, 0); 
     VARIANT vBstr; 
     VariantInit(&vBstr); 
     VariantChangeType(&vBstr, &vtProp, 0, VT_BSTR); 
     wcout << "Name : " << vBstr.bstrVal << endl; 
     VariantClear(&vtProp); 
     VariantClear(&vBstr); 
    } 

    // Cleanup 
    // ======== 

    pSvc->Release(); 
    pLoc->Release(); 
    pEnumerator->Release(); 
    pclsObj->Release(); 
    CoUninitialize(); 

    return 0; // Program successfully completed. 

} 
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