Re: Preventing multiple instances of COM singleton??? - ATL / WTL / STL Discussion Boards

VVVimal14-Sep-09 19:17

14-Sep-09 19:17

Hi
Can anyone tell how to compare systemtime.
SYSTEMTIME t1;
SYSTEMTIME t2;
GetSystemTime(&t1);
GetSystemTime(&t2);

Is this a good approach
t1==t2

Thanks

Re: SYSTEMTIME

Stuart Dootson15-Sep-09 0:18

Stuart Dootson

15-Sep-09 0:18

No. Because SYSTEMTIME doesn't have an operator== defined for it. You can define one.

bool operator==(const SYSTEMTIME& left, const SYSTEMTIME& right)
{
   // Compare every element of left with every element of right
}

BTW - wrong forum - SYSTEMTIME has nopthing to do with ATL, WTL or STL

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

Re: SYSTEMTIME

BlueSkycpp26-Oct-09 18:47

BlueSkycpp

26-Oct-09 18:47

SYSTEMTIME t1;
SYSTEMTIME t2;
GetSystemTime(&t1);
GetSystemTime(&t2);

CTime tme1(&t1);
CTime tme2(&t2);

tme1 == tme2 ? TRUE : FALSE;

Compare two different STL list

VVVimal13-Sep-09 21:56

VVVimal

13-Sep-09 21:56

Hi
I had two diffrent
class Student
{
public:
string name;
int age;

};
list<student*> _studentList1;
list<student*> _studentList2;

I just want to compare wheather the content of two list are same.
Can any one tell me how to do that.....

Below i have implemented one example
for(std::list<student*>::iterator iterator1 =_studentList1.begin();studentList1.end() != iterator1; ++iterator1)
{
for(std::list<student*>::iterator iterator2 =_studentList2.begin();studentList2.end() != iterator2; ++iterator2)
{
Student* studentDetails1 = *iterator1;
Student* studentDetails2 = *iterator2;
if(!strcmp(studentDetails1->name ,studentDetails2->name)
if(studentDetails1->age== studentDetails2->age)
}
}

Is this is best approach to compare List

++iterator)

Thanks in advance

Re: Compare two different STL list

Stuart Dootson13-Sep-09 23:07

Stuart Dootson

13-Sep-09 23:07

No, it's not the best way - the best way would be to define an operator== for Student, then use the operator== defined for std::list. Also - isn't the 'name' member a std::string? In which case that has an operator==

Anyway - I'd do this:

class Student
{
public:
std::string name;
int age;
friend bool operator==(Student const& left, Student const& right)
{ return left.age==right.age && left.name==right.name; }
};
std::list<Student> _studentList1;
std::list<Student> _studentList2;

Then in code, I could do

if (_studentList1 == _studentList2)

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

Preventing multiple instances of COM singleton???

kb-boxer30-Aug-09 20:52

kb-boxer

30-Aug-09 20:52

Hi
I am building a out of proc COM Server, which would be registered as service. I want my server to be a singleton, so I have declared DELCARE_CLASSFACTORY_SINGLETON in my coclass. My server startup code RegisterClassObjects with REGCLS_MULTIPLEUSE flag. However, it is possible to launch 2 instances of my server process; one that is launched by the service manager and running under the system account; the second one can be launched from the current user's account.

How do I prevent mutiple instances of my COM server, irrespective of the user accounts?

Thanks in advance
Vivek Ragunathan

http://vivekragunathan.spaces.live.com

Programming is an art. Code is a poem

Re: Preventing multiple instances of COM singleton???

«_Superman_»30-Aug-09 21:20

«_Superman_»

30-Aug-09 21:20

You can create a global named mutex to prevent running multiple instances of an EXE across multiple use accounts.
Prefix the mutex name with "Global\"

Use CreateMutex[^] to create the object.
If calling GetLastError[^] after this returns ERROR_ALREADY_EXISTS the EXE can quit itself using PostQuitMessage[^].

«_Superman_»
I love work. It gives me something to do between weekends.

Re: Preventing multiple instances of COM singleton???

kb-boxer31-Aug-09 0:23

kb-boxer

31-Aug-09 0:23

Thanks. That is one way to solve the problem.

But what I am really looking for is a way that COM infrastructure would take care of. What this means is I should not report error to the user, instead return the reference of the already created COM object.

If the COM server is launched as service and all users connect to it using CoCreateInstance, they get the same reference. But when the COM server is launched using the current user account, things are screwed up as a second instance is created. Instead COM should not create the second instance, instead return the reference of the COM object hosted in the service.

Thanks

http://vivekragunathan.spaces.live.com

Programming is an art. Code is a poem

How can I hide the WTL Dialog scrollbar in SmartPhone?

Kiss Rain17-Aug-09 17:29

Kiss Rain

17-Aug-09 17:29

The syatem scrollbar is overrided, but it shows both of system amd myself. Can I kill the system's or hide it? Help me, please! Thank you!

What should I do that I want to develop a MenuBar or ToolBar using ATL? [modified]

Nothend11-Aug-09 19:37

Nothend

11-Aug-09 19:37

Hi,guys!
I want to develop a COM control that can be used by other people.
First, i want develop a MenuBar using ATL,and then this MenuBar can be drag in other frame window.
I'm using vs 2005,how can i get this? Any tutorial articles or source code for this ?
Any help would be appreciate !

modified on Wednesday, August 12, 2009 1:48 AM

Where to get more information about windows shell?

mr.dot9-Aug-09 7:51

mr.dot

9-Aug-09 7:51

Hi, guys, I'm writing simple tool for interest, like managing softwares, file association or IE history.
But when I get into this field, I find there are many information stored in files or registry. Like "index.dat" or "HKLM\SOFTWARE\Clients".
So I want to know, where I can get more information about such thing( registry about shell )?
Thanks in advance. Smile | :)

Re: Where to get more information about windows shell? [modified]

Richard MacCutchan8-Sep-09 0:59

Richard MacCutchan

8-Sep-09 0:59

You could start here for information on the Windows Registry. But please take note of the warnings about changing values inside the Registry, as it is easy to get it wrong and make your system unusable. Also try searching CodeProject and Google.

modified on Tuesday, September 8, 2009 5:58 PM

Re: Where to get more information about windows shell?

mr.dot8-Sep-09 15:11

mr.dot

8-Sep-09 15:11

Thank you very much.
I'm one developer.
I try to MSDN/Google/CodeProject etc, when I encounter problems.
But I want one way to know what registry keys and values mean, such as how to set default browsers, how to change advanced UI of windows etc.
So I can solve problems more professional.

Re: Where to get more information about windows shell?

Richard MacCutchan8-Sep-09 22:23

Richard MacCutchan

8-Sep-09 22:23

SpringLion wrote:
I want one way to know what registry keys and values mean

Your question is beyond the scope of these forums. There are hundreds of registry keys and values but no standard work of reference to describe them all. Try this site for a start, and then when you have a single question about a specific registry key, come back here and post your question.

Re: Where to get more information about windows shell?

David_LoveCpp28-Sep-09 21:26

David_LoveCpp

28-Sep-09 21:26

msdn

ATL Services Cannot start?

fitatc6-Aug-09 20:23

fitatc

6-Aug-09 20:23

I am new in ATL at all. First time try to learn ATL this morning(in japan) that turn out to be a bad experience.

Following the Wizard I created a ATL Service Project, install it as a service.(using vs2008)
And I cannot beleve that SCM cannot start the service.!!!! Mad | :mad:

Thanks to the codeproject, I found the answer by two message in 2002
[Message1:]http://www.codeproject.com/Messages/127680/Problem-with-ATL-7-0-Service.aspx?bmkres=success[^]
[Message2:]http://www.codeproject.com/Messages/130324/I-found-2-issues-in-ATL-7-0-Service-projects-Should-I-put-this-somewhere-here.aspx?bmkres=success[^]

It is been 7 years past, what wrong with the ATL?
1. What is the simplest way to run a service? create a com object?(a ref would be appriciated)
2. If Message1 is right, why microsoft did not fix it?

how to find Textbox value in the DirectUI

ChinaTJBoy23-Jul-09 21:28

ChinaTJBoy

23-Jul-09 21:28

how to find Textbox value in the DirectUI
I did not find the use of API GetWindowText

Re: how to find Textbox value in the DirectUI

Michael Dunn27-Jul-09 12:19

Michael Dunn

27-Jul-09 12:19

DirectUI is completely undocumented, all you can hope for is that someone has reverse-engineered how that control works and posted about it on the net.

--Mike--
Dunder-Mifflin, this is Pam.

Can I use std::tr1::share_ptr in VS2008 SP1 to replace auto_ptr in my project?

hawkgao012922-Jul-09 15:53

hawkgao0129

22-Jul-09 15:53

I have legacy code written under VC6 which use a lot of auto_ptr. And, have problem to build it under VS2008/VC9, becouse it's put auto_ptr in vector, that isn't accepted in VC9. Then, I want share_ptr to replace it. Can I just replace them at where they are declared?
Thanks,
Hawk

Re: Can I use std::tr1::share_ptr in VS2008 SP1 to replace auto_ptr in my project?

Stuart Dootson22-Jul-09 18:58

Stuart Dootson

22-Jul-09 18:58

hawkgao0129 wrote:
I want share_ptr to replace it. Can I just replace them at where they are declared?

Yes.

The difference between auto_ptr and shared_ptr is that auto_ptr passes ownership around like a token, and it's possible for ownership to expire (and the object to be deleted) before you expect.

shared_ptr is like lots of people holding a plate - the plate doesn't break until everyone's let go of it.

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

Re: Can I use std::tr1::share_ptr in VS2008 SP1 to replace auto_ptr in my project?

hawkgao012922-Jul-09 20:21

hawkgao0129

22-Jul-09 20:21

In legacy code, it employed auto_ptr::release() to free resource. When i use shared_ptr, how to release resource? use "delete" keyword to call destructor of shared_ptr?

Re: Can I use std::tr1::share_ptr in VS2008 SP1 to replace auto_ptr in my project?

Stuart Dootson22-Jul-09 21:34

Stuart Dootson

22-Jul-09 21:34

No - use the reset()[^] method.

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

Re: Can I use std::tr1::share_ptr in VS2008 SP1 to replace auto_ptr in my project?

hawkgao012922-Jul-09 22:03

hawkgao0129

22-Jul-09 22:03

you mean shared_ptr::reset(0)? Why tr1::shared_ptr doesn't have an explicit release() function? Do auto_ptr::reset(0) and auto_ptr::release() have the same mean?

Re: Can I use std::tr1::share_ptr in VS2008 SP1 to replace auto_ptr in my project?

hawkgao012922-Jul-09 22:13

hawkgao0129

22-Jul-09 22:13

Oh, shared_ptr::reset() can be called without argument. That means set it become empty. Maybe equal to auto_ptr::release()

Re: Can I use std::tr1::share_ptr in VS2008 SP1 to replace auto_ptr in my project?

Stuart Dootson22-Jul-09 22:18

Stuart Dootson

22-Jul-09 22:18

hawkgao0129 wrote:
Maybe equal to auto_ptr::release()

For your purposes, yes - they're equivalent

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

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