Connecting to WMI -using COM [modified] - C / C++ / MFC Discussion Boards

Re: How to access a remote machine from a local machine and perform basic function like execute and close the remote machine's application.

CPallini26-Jul-09 23:49

CPallini

26-Jul-09 23:49

So you're two: the coward and the idiot.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: How to access a remote machine from a local machine and perform basic function like execute and close the remote machine's application. [modified]

Madhu_Rani27-Jul-09 19:08

Madhu_Rani

27-Jul-09 19:08

Dont be upset Laugh | :laugh:

. Now you are too TWO and an idiot find another idiot for help: Smile | :)

modified on Tuesday, July 28, 2009 1:54 AM

Re: How to access a remote machine from a local machine and perform basic function like execute and close the remote machine's application.

Rajesh R Subramanian27-Jul-09 23:58

Rajesh R Subramanian

27-Jul-09 23:58

Madhu_Rani wrote:
modified on Tuesday, July 28, 2009 1:54 AM

Yet again you go about posting one thing and modifying it to look innocent. You're a tosser.

It is a crappy thing, but it's life -^ Carlo Pallini

Re: How to access a remote machine from a local machine and perform basic function like execute and close the remote machine's application.

Madhu_Rani28-Jul-09 0:07

Madhu_Rani

28-Jul-09 0:07

and you know it very well that this time I did not delete a single word rather I added more words in your praise. So this time this silly excuse of modification would not work.

Re: How to access a remote machine from a local machine and perform basic function like execute and close the remote machine's application.

Manas Bhardwaj28-Jul-09 3:17

Manas Bhardwaj

28-Jul-09 3:17

Madhu_Rani wrote:
an idiot find another idiot for help

I do not know about your IQ, but commenting like this on two MVPs is utterly foolish.

Manas Bhardwaj
Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.

Re: How to access a remote machine from a local machine and perform basic function like execute and close the remote machine's application.

Manas Bhardwaj28-Jul-09 3:25

Manas Bhardwaj

28-Jul-09 3:25

Rajesh R Subramanian wrote:
I think that you are a complete idiot.

Yes He is!!! Smile | :)

He probably does not have access to Yahoo and that is why trying to pass time here.
You should just ignore him as you can never win if you arguing with an idiot.

Manas Bhardwaj
Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.

Re: How to access a remote machine from a local machine and perform basic function like execute and close the remote machine's application.

Rajesh R Subramanian28-Jul-09 3:57

Rajesh R Subramanian

28-Jul-09 3:57

I should have realised. I'll ignore 'em from now. Smile | :)

It is a crappy thing, but it's life -^ Carlo Pallini

Connecting to WMI -using COM [modified]

Member 432083115-Jul-09 22:12

Member 4320831

15-Jul-09 22:12

Hi, I'm rather new to using COM. I was to trying to connect to WMI and plan to create two separate threads that will connect to WMI parallelly. Both the threads will be watching for some WMI events. My question is, do I need to use two separate proxies for each of the threads. Can I use the same IWbemServices pointer (say declared globally ,or passed by reference to the thread) in my second thread as well. This other thread would be looking for some other event but using the same WMI namespace. Would that work?

Also can the same WMI locator (obtained from CoCreateInstance) be used to connect to other WMI namespaces as well?

I'm very new to COM and don't understand the concepts too well. Please help Confused | :confused:

[Edit]
Someone please guide me a little here! I'm totally lost in COM ocean.. Cry | :((

modified on Thursday, July 16, 2009 11:37 AM

Re: Connecting to WMI -using COM

Stuart Dootson15-Jul-09 22:24

Stuart Dootson

15-Jul-09 22:24

I think it depends how you initialise COM. COM can be run as single[^]- or multi[^]-threaded. I think the multi-threaded version would allow you to share interface pointers.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: Connecting to WMI -using COM

Member 432083116-Jul-09 1:59

Member 4320831

16-Jul-09 1:59

Well I've initialized it as COINIT_MULTITHREADED in CoInitializeEx() but it doesn't work as hoped. I use the same IWbemServices pointer (all initializations done just the first time) to run an ExecNotificationQuery with different WMI queries. However my ExecNotificationQuery fails. The two queries work fine if done individually but I can't seem to be able register for two separate WMI events separately.

If I do the whole initialization again for my 2nd query then I get an error in COM security initialization.

Code Snippet:
HANDLE hres;
hres = CoInitializeEx(0, COINIT_MULTITHREADED);
if (FAILED(hres))
{output something}
hres = CoInitializeSecurity(NULL,1,NULL,NULL, RPC_C_AUTHN_LEVEL_DEFAULT, RPC_C_IMP_LEVEL_IMPERSONATE,NULL, EOAC_NONE,NULL);
hres = CoCreateInstance(
CLSID_WbemLocator,
0,
CLSCTX_INPROC_SERVER,
IID_IWbemLocator, (LPVOID *) &pLoc);
hres = pLoc->ConnectServer(
_bstr_t(L"ROOT\\WMI"), // 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
);
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
);

IEnumWbemClassObject* pEnumerator = NULL;
hres = pSvc->ExecNotificationQuery(
bstr_t("WQL"),
bstr_t("SELECT * FROM ..."),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
NULL,
&pEnumerator);
Then I use pEnumerator->Next within a loop and cleanup.

I run this function twice in separate threads.Ideas?

IP from socket handle

sunny_vc15-Jul-09 21:17

sunny_vc

15-Jul-09 21:17

Hi all,
Is it possible to get client IP from the socket handle to which it is connected.
If possible please let me know.

Regards,
Sunil Kumar

Re: IP from socket handle

CPallini15-Jul-09 21:28

CPallini

15-Jul-09 21:28

getpeername [^] looks promising.
Smile | :)

CreateProcess doesn’t passes command line arguments [modified]

staticv15-Jul-09 20:56

staticv

15-Jul-09 20:56

Hello I have the following code but it isn't working as expected, can't figure out what the problem is.

Basically, I'm executing a process (a .NET process) and passing it command line arguments, it is executed successfully by CreateProcess() but CreateProcess() isn't passing the command line arguments

What am I doing wrong here??

int main(int argc, char* argv[])
{
    PROCESS_INFORMATION ProcessInfo; //This is what we get as an [out] parameter

    STARTUPINFO StartupInfo; //This is an [in] parameter

    ZeroMemory(&StartupInfo, sizeof(StartupInfo));
    StartupInfo.cb = sizeof StartupInfo ; //Only compulsory field

    LPTSTR cmdArgs = "name@example.com";

    if(CreateProcess("D:\\email\\smtp.exe", cmdArgs, 
        NULL,NULL,FALSE,0,NULL,
        NULL,&StartupInfo,&ProcessInfo))
    { 
        WaitForSingleObject(ProcessInfo.hProcess,INFINITE);
        CloseHandle(ProcessInfo.hThread);
        CloseHandle(ProcessInfo.hProcess);

        printf("Yohoo!");
    }  
    else
    {
        printf("The process could not be started...");
    }

    return 0;
}

Hey one more thing, if I pass my cmdArgs like this:

// a space as the first character
LPTSTR cmdArgs = " manzoor10@gmail.com";

I get the error:

Object reference not set to an instance of an object

then CreateProcess returns TRUE but my target process isn't executed.

Top Web Hosting Providers[^]

Do, or do not. There is no 'try'.

modified on Thursday, June 10, 2010 2:13 AM

Re: CreateProcess doesn’t passes command line arguments

Franck Paquier15-Jul-09 21:18

Franck Paquier

15-Jul-09 21:18

good morning

Not sure it will solve your problem but did you notice that lpCommandLine is an in out parameter ?
in MSDN Help i found the following information:

The Unicode version of this function, CreateProcessW, can modify the contents of this string. Therefore, this parameter cannot be a pointer to read-only memory (such as a const variable or a literal string). If this parameter is a constant string, the function may cause an access violation.

Hope this will help.
Regards
Franck

Re: CreateProcess doesn’t passes command line arguments

Michael Schubert15-Jul-09 22:17

Michael Schubert

15-Jul-09 22:17

This:
http://bobmoore.mvps.org/Win32/w32tip46.htm[^]
may give you some insight but I'm not sure.

I always use CreateProcess by concatenating the app name and the arguments and set this as the second parameter (first parameter set to NULL) and it has never failed.

Re: CreateProcess doesn’t passes command line arguments

Stuart Dootson15-Jul-09 22:20

Stuart Dootson

15-Jul-09 22:20

I suspect your command-line argument is being interpreted as the executable name. See the CreateProcess[^] documentation:

Console processes written in C can use the argc and argv arguments to parse the command line. Because argv[0] is the module name, C programmers generally repeat the module name as the first token in the command line.

While that's talking about C programs, .NET programs conform to that as well. Add an argument before the e-mail address and you should find it all works.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: CreateProcess doesn’t passes command line arguments

tns_ranjith15-Jul-09 22:41

tns_ranjith

15-Jul-09 22:41

PROCESS_INFORMATION pi;
ZeroMemory (&pi, sizeof (pi));

STARTUPINFOA si;
ZeroMemory( &si, sizeof(si) );
si.cb = sizeof(si);
si.dwFlags = STARTF_USESHOWWINDOW;
//si.wShowWindow = SW_HIDE;
si.wShowWindow = SW_SHOW;

CreateProcessA (NULL, cmd, 0, 0, 0, CREATE_NO_WINDOW, 0, 0, &si, &pi);

Re: CreateProcess doesn’t passes command line arguments

Michael Schubert15-Jul-09 23:00

Michael Schubert

15-Jul-09 23:00