fail to get information from remote machine using WMI, vc 6

[TechCrazy]

Hi,everyone!

i tried to get information from remote machine using WMI by vc6,
i can connect with remote machine ,but i fail to get the infomation,
and then i tried wbemtest tool, there is no problem between the two computers,

here is my code ,Any suggestion will be really appreciated!

#define _WIN32_DCOM
#include <iostream>
#include <comdef.h>
#include <Wbemidl.h>
# pragma comment(lib, "wbemuuid.lib")
#include   <atlbase.h>
#include <windows.h>
#include <wincred.h>
# pragma comment(lib, "credui.lib")
using namespace std;


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;

// Get the user name and password for the remote computer
CREDUI_INFO cui;
TCHAR pszName[CREDUI_MAX_USERNAME_LENGTH+1]="user";
TCHAR pszPwd[CREDUI_MAX_PASSWORD_LENGTH+1]="pass";
BOOL fSave;
DWORD dwErr;

cui.cbSize = sizeof(CREDUI_INFO);
cui.hwndParent = NULL;
// Ensure that MessageText and CaptionText identify
// what credentials to use and which application requires them.
cui.pszMessageText = TEXT("Remote computer account information");
cui.pszCaptionText = TEXT("Enter Account Information");
cui.hbmBanner = NULL;
fSave = FALSE;

dwErr = CredUIPromptForCredentials(
&cui, // CREDUI_INFO structure
TEXT("\\10.7.24.83"), // Target for credentials
NULL, // Reserved
0, // Reason
pszName, // User name
CREDUI_MAX_USERNAME_LENGTH+1, // Max number for user name
pszPwd, // Password
CREDUI_MAX_PASSWORD_LENGTH+1, // Max number for password
&fSave, // State of save check box
CREDUI_FLAGS_GENERIC_CREDENTIALS | // flags
CREDUI_FLAGS_ALWAYS_SHOW_UI |
CREDUI_FLAGS_DO_NOT_PERSIST);

if(dwErr)
{
cout << "Did not get credentials." << endl;
pLoc->Release();
CoUninitialize();
return 1;
}

// Connect to the remote root\cimv2 namespace
// and obtain pointer pSvc to make IWbemServices calls.
//---------------------------------------------------------
// change the computerName and domain
// strings below to the full computer name and domain
// of the remote computer

hres = pLoc->ConnectServer(
_bstr_t(L"\\\\10.10.13.48\\root\\cimv2"),
_bstr_t("user"), // User name
_bstr_t("pass"), // User password
_bstr_t(L"MS_409"), // Locale
NULL, // Security flags
_bstr_t(L"ntlmdomain:domain"), // Authority
0, // Context object
&pSvc // IWbemServices proxy
);

// When you have finished using the credentials,
// erase them from memory.
// SecureZeroMemory(pszName, sizeof(pszName));
// SecureZeroMemory(pszPwd, sizeof(pszPwd));

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 a WMI connection ------------------

SEC_WINNT_AUTH_IDENTITY_W* pAuthIdentity =
new SEC_WINNT_AUTH_IDENTITY_W;
ZeroMemory(pAuthIdentity, sizeof(SEC_WINNT_AUTH_IDENTITY_W));


pAuthIdentity->User = new WCHAR[32];
wcscpy(pAuthIdentity->User , L"user" );
pAuthIdentity->UserLength = wcslen(pAuthIdentity->User);


pAuthIdentity->Domain = new WCHAR[32];
wcscpy(pAuthIdentity->Domain, L"\\10.10.13.48");
pAuthIdentity->DomainLength = wcslen( pAuthIdentity->Domain);


pAuthIdentity->Password = new WCHAR[32];
wcscpy(pAuthIdentity->Password, L"pass" );
pAuthIdentity->PasswordLength = wcslen( pAuthIdentity->Password);


pAuthIdentity->Flags = SEC_WINNT_AUTH_IDENTITY_UNICODE;

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
pAuthIdentity, // 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_OperatingSystem"),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL,
&pEnumerator);

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

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

IWbemClassObject *pclsObj=NULL;
ULONG uReturn = 0;

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

if(0 == uReturn) //But uReturn =0 all the time!
{
break; // break every time!
}

VARIANT vtProp;

// Get the value of the Name property
hr = pclsObj->Get(L"Name", 0, &vtProp, 0, 0);
wcout << " OS Name : " << vtProp.bstrVal << endl;

// Get the value of the FreePhysicalMemory property
hr = pclsObj->Get(L"FreePhysicalMemory",
0, &vtProp, 0, 0);
wcout << " Free physical memory (in kilobytes): "
<< vtProp.uintVal << endl;
VariantClear(&vtProp);
}

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

pSvc->Release();
pLoc->Release();
pEnumerator->Release();
pclsObj->Release(); //often return "access deny"
Sleep(1000);
CoUninitialize();

return 0; // Program successfully completed.

}

[TheCPUWizard]

Please go back and re-read the "Before you Post" announcement. It will show you how to properly post your code so that it is actually readable! You can then EDIT your existing post.

[TechCrazy]

it was my fault, now i have modified it ~
thank you all the same.

[TheCPUWizard]

it was my fault, now i have modified it ~
thank you all the same.

No you made it worse...now you are expecting people (who are volunteeering their time..) to spend time downloading and opening a file.

You should:

a) Use Code Tags
b) Enable Private messaging [so things like this do not cause permanent clutter to the threade.

Please do not skim, or browse the FAQ's READ them CAREFULLY! Spend time practicing posting in the forum that is specifically set up for that.

[TechCrazy]

No you made it worse...now you are expecting people (who are volunteeering their time..) to spend time downloading and opening a file.

You should:

a) Use Code Tags
b) Enable Private messaging [so things like this do not cause permanent clutter to the threade.

Please do not skim, or browse the FAQ's READ them CAREFULLY! Spend time practicing posting in the forum that is specifically set up for that.

i think it's ok this time , i am new here, thank you,
but what exactly i need is the suggestion to my question~Anyone can help me ?

[TheCPUWizard]

Now that is it (almost) readable....

Which call is failing; and what is the error message. I am semi suspicious about the ConnectServer call and the fact that you are not using a standard DQN..... but you have not provided sfficient information.

[TechCrazy]

thank you for your reply!
just "connect ..." was put out,everything seemed to be fine.
the code i wrote is a sample from msdn ,but it didn't work fine.
but after debug ,i found:

if(0 == uReturn) //uReturn =0 all the time!
{
break; // break every time!
}
....
pclsObj->Release(); //often return "access deny"

[TheCPUWizard]

pSvc->ExecQuery(

is returning S_OK....and...

pEnumerator ///is or is not null...

RIGHT AFTER THE CALL....
Check this with the debugger (SINGLE STEP EACH LINE)...NOT diagnostic type printing. Examine the state of all variables as each system call occurs, to make sure there are no unexpected variable changes.

[TechCrazy]

yes,i used the single step each line debugger

 pSvc->ExecQuery

return S_OK indeed,

and

 pEnumerator

is not null, but i don't know what value it should be,

 HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1,

&pclsObj, &uReturn);
if(0 == uReturn)

{

break;

}

after the call,uReturn returns 0 all the time,and "break" the "while" every time.
i don't know why uReturn always return 0.

[TheCPUWizard]

Interesting you seem to be getting an enumerator (ie it is not null), but the very first call to Next returns a null. This indicates that there are no resources that you have permission to view...... Are you sure you usernames and passwords are correct????

[TechCrazy]

i am sure username and password are correct,
and i used wbemtest with the same username , password, everything went fine(connect, query)

[TechCrazy]

HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1,

&pclsObj, &uReturn);

if(FAILED(hr)){....}

i found hr returned failed.....
why did it happen?

[TheCPUWizard]

HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1,

&pclsObj, &uReturn);

if(FAILED(hr)){....}

i found hr returned failed.....
why did it happen?

So you weant me to GUESS what the error code returned was.....

[TechCrazy]

right now ,i created a account in target machine ,the same username and password with my machine, and the code worked !!!!
but why?