BIOS Serial (Code Included)

This code reads the BIOS serial number using WMI but generates an error i'm unable to resolve. Help needed regarding this.

#include "stdafx.h"
#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;

// 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.
}

// Initialize
hres = CoInitializeSecurity(
NULL,
-1, // COM negotiates service
NULL, // Authentication services
NULL, // Reserved
RPC_C_AUTHN_LEVEL_DEFAULT, // authentication
RPC_C_IMP_LEVEL_IMPERSONATE, // 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.
}

// Obtain the initial locator to Windows Management
// on a particular host computer.
IWbemLocator *pLoc = 0;

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

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

IWbemServices *pSvc = 0;

// 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"), // WMI namespace
NULL, // User name
NULL, // User password
0, // Locale
NULL, // Security flags
0, // Authority
0, // Context object
&pSvc // 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;

// Set the IWbemServices proxy so that impersonation
// of the user (client) occurs.
hres = CoSetProxyBlanket(

pSvc, // the proxy to set
RPC_C_AUTHN_WINNT, // authentication service
RPC_C_AUTHZ_NONE, // authorization service
NULL, // Server principal name
RPC_C_AUTHN_LEVEL_CALL, // authentication level
RPC_C_IMP_LEVEL_IMPERSONATE, // impersonation level
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.
}


// Use the IWbemServices pointer to make requests of WMI.
// Make requests here:

// For example, query for print queues that
// have more than 10 jobs
IEnumWbemClassObject* pEnumerator = NULL;
hres = pSvc->ExecQuery(
bstr_t("WQL"),
bstr_t("SELECT * Win32_BIOS "),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL,
&pEnumerator);

if (FAILED(hres))
{
cout << "Query for print queues failed. "
<< "Error code = 0x"
<< hex << hres << endl;
pSvc->Release();
pLoc->Release();
CoUninitialize();
return 1; // Program has failed.
}
else
{
do
{
IWbemClassObject* pInstance = NULL;
ULONG dwCount = NULL;

hres = pEnumerator->Next(
WBEM_INFINITE,
1,
&pInstance,
&dwCount);

} while (hres == WBEM_S_NO_ERROR);

}

VARIANT v;

IWbemClassObject * pClassObject = NULL;
BSTR strClassProp = SysAllocString(L"Serial Number");
hres = pClassObject->Get(strClassProp, 0, &v, 0, 0);
SysFreeString(strClassProp);

_bstr_t bstrPath = &v; //Just to convert BSTR to ANSI


char* strPath=(char*)bstrPath;
if (SUCCEEDED(hres))
printf (strPath);
else
printf ("Error in getting object");
VariantClear( &v );

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

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



return 0; // Program successfully completed.
}

1. What's the error you're receiving?
2. Can you put your code in a code tag?

Thx a lot for replying. I get the following error message.
Please also see the attached file.
Error:

Unhandled exception at 0x0041d956 in wmii_test.exe: 0xC0000005: Access violation reading location 0x00000000.

First-chance exception at 0x0041d956 in wmii_test.exe: 0xC0000005: Access violation reading location 0x00000000.
Unhandled exception at 0x0041d956 in wmii_test.exe: 0xC0000005: Access violation reading location 0x00000000.

....
....
hres = pSvc->ExecQuery(
bstr_t("WQL"),
bstr_t("SELECT * FROM Win32_BIOS "),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL,
&pEnumerator);

IWbemClassObject* pInstance;
if (FAILED(hres))
{
cout << "Query for print queues failed. "
<< "Error code = 0x"
<< hex << hres << endl;
pSvc->Release();
pLoc->Release();
CoUninitialize();
return 1; // Program has failed.
}
else
{
do
{
ULONG dwCount = 0;

hres = pEnumerator->Next(
WBEM_INFINITE,
1,
&pInstance,
&dwCount);

} while (hres == WBEM_S_NO_ERROR);

}

VARIANT v;
VariantInit(&v);

// IWbemClassObject * pClassObject = NULL;
BSTR strClassProp = SysAllocString(L"SerialNumber");

I made a few changes to the program (see attached):

1. Used the _COM_SMARTPTR_TYPEDEF macros defined in <comdef.h> to convert all the IWbemXXX interfaces to smart pointers - makes calling IWbemXXX->Release() unnecessary.
2. Used the _variant_t wrapper instead of VARIANT
3. Moved the IWbemClassObjectPtr->Get() call inside the do/while loop.
4. Changed the "Serial Number" property to "SerialNumber" as ShelleyWang suggested.
5. Moved the Bios retrieval code into a function so CoUninitialize doesn't get called before the smart pointers go out of scope (a scoping block would have worked equally as well).
6. Replaced the call to IWbemServices->ExecQuery() with a call to IWbemServices->CreateInstanceEnum(). I couldn't get the ExecQuery call to work with your code and I didn't have time to look into the Synchronous, Asynchronous, or SemiSynchronous modes. (As George Carlin once said: "It either flams or it doesn't flam." :D ). Anyway, CreateInstanceEnum works fine here.

Arjay

Thanks a lot for your help. I really appreciate the time you spend or debugging this code. The code although is giving no errors, but it also not displaying the required BIOS information ..:)

Hello Soft, Do you mean my codes still run improperly?

But on my computer, it's run normally and get the right Serial Number.

Your code runs perfectly alright, but it doesn't display any output. Can you plz send the exe file or preferably the project files.

Thanks.

I have two computer, one runs properly and get the right Serial Number, then other runs properly too but it cann't gets the Serial Number, it appears "none".

I don't know what's the mater with this program.

Anywhere , if you want the program, please give me you E-Mail address

Email : [email protected]

Can anyone comment on this, why it is not displaying the BIOS information?

I'd suggest installing the WMI Tools from the sdk and using the CIM Studio to determine if the SerialNumber property is actually set. Btw, did you run the modified wmii_test code that I attached. I tried it out on a couple of computers and it worked on both.

[Arjay revision] Actually it did work, but until I looked at the output and compared it with CIM Studio, I didn't know that Win32_BIOS is the wrong class to use. Instead use Win32_BaseBoard.

See the attachment for a sample that uses this data.

Arjay

Code:

---

IWbemClassObjectPtr spBaseBoard = NULL;
if( FAILED( hres
= spSvc->GetObject(_bstr_t("Win32_BaseBoard.Tag=\"Base Board\""),
        0,
        NULL,
        &spBaseBoard,
        NULL)) )
{
cout << "Unable to Win32_BaseBoard Object. "
        << "Error code = 0x"
        << hex << hres << endl;
return hres;
}
 
variant_t v;
if( FAILED( hres
= spBaseBoard->Get(bstr_t( L"SerialNumber" ), 0, &v, 0, 0)) )
{
cout << "Unable to retrieve SerialNumber property. "
        << "Error code = 0x"
        << hex << hres << endl;
return hres;
}
cout << "SerialNumber: " << bstr_t(v) << endl;
 


---

Hello Arjay, Can you give me all your source code of 'SystemInfo'?

Thanks, [email protected]

Hello Arjay, that was really considerate and kind of you to look into the code in detail. It helped a lot and you cant imagine that how accelerating that was in simulating an aspect of ma project. thanx a lot again, God bless ya!

Quote:

---

Originally Posted by ShelleyWang

Hello Arjay, Can you give me all your source code of 'SystemInfo'?

Thanks, [email protected]

---

Unfortunately, not as this time as it would take quite a bit of work to refactor it. I did write some similar code for a sample in another forum called Using WMI... The sample is in C#, but can be easily ported back to C++.

Arjay