BIOS Serial (Code Included)

[SoftLock]

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.
}

[Bond]

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

[SoftLock]

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.

[ShelleyWang]

....
....
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");

[Arjay]

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." ). Anyway, CreateInstanceEnum works fine here.

Arjay

[SoftLock]

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 ..

[ShelleyWang]

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

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

[SoftLock]

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.

[ShelleyWang]

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

[SoftLock]

Email : softl0ck@yahoo.com

[SoftLock]

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

[Arjay]

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

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;
 

[ShelleyWang]

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

Thanks, 201117@163.com

[SoftLock]

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!

[Arjay]

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

Thanks, 201117@163.com

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