ATL / WTL / STL

Tim Smith30-Oct-02 13:59

30-Oct-02 13:59

Exactly. I have no problems using standard C string because I am VERY VERY careful. When I want to be even EXTRA careful, I use vsnprintf which is overrun safe.

I use STL a lot. But when it comes to time critical, I am always going back to code written specifically for the job.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

User 988530-Oct-02 15:41

User 9885

30-Oct-02 15:41

I used sprintf, only because the largest message size is already known and anything larger than that is discarded.

modified 29-Aug-18 21:01pm.

Christian Graus30-Oct-02 14:06

Christian Graus

30-Oct-02 14:06

I hate to agree with Tim on this ( hi, Tim ), but it's obvious that a generic solution such as ostringstream is simply not going to be optimised for the sort of heavy use you're asking of it. If it's only initialising, you can keep an ostringstream member and use str("") to clear it, but overall, 10,000 hits a second to me is time to go as low level as possible.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

Tim Smith30-Oct-02 14:41

30-Oct-02 14:41

Hehehe

I know I really over state my position a LOT. But most of the time that is all I am trying to say. I just want people to be open to alternative ways of doing things. Understand the problem and the available solutions and it is hard to go wrong.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Christian Graus30-Oct-02 14:48

Christian Graus

30-Oct-02 14:48

Tim Smith wrote:
I know I really over state my position a LOT.

Yeah, not like me at all. Oh, wait.... :P

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

Tim Smith30-Oct-02 14:50

30-Oct-02 14:50

LOL - and I really mean it too.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Tim Smith30-Oct-02 14:51

30-Oct-02 14:51

actually, LOSLISTC - Laughed out so loud I scared the cats.

I looked down and they were both looking up... "What the hell is wrong with you????"

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

using a activex dll created in vb in an atl/mfc component

User 988530-Oct-02 16:07

User 9885

30-Oct-02 16:07

Christian Graus wrote:
use str("") to clear it,

reduced from 5 ms to 4 ms. Anyway, cannot compete with a char buffer. As Tim and you pointed out, my obsession with using STL in all situations caused this problem. I should have realized (as I have now) earlier that a high efficiency loop requires optimization and not generic classes.

In fact, initially I was having another thread of discussion with Tim about hash_map (because i did not suspect ostringstream, until I profiled it). Actually hash_map works great and the hash function which I copied from the CMapStringToString in MFC gives me virtually 0 collissions for my data set.

Anyway, I learned that I should not assume anything about a problem.

Thanks a lot for the insight you guys give. I have definitely become a much better programmer and designer with the interactions that I have at CP.

Thomas

modified 29-Aug-18 21:01pm.

Using CTreeViewCtrl

Jose Cruz30-Oct-02 3:08

Jose Cruz

30-Oct-02 3:08

Can somebody show me how do I implement in my view the event on item expanding using a CTreeViewCtrl derived class.

Thanks Frown | :(

Re: Using CTreeViewCtrl

User 988530-Oct-02 13:32

User 9885

30-Oct-02 13:32

VC++ would have been a better forum for this question. More people who may know the answer to this question hang out there.

modified 29-Aug-18 21:01pm.

Re: Using CTreeViewCtrl

Jose Cruz1-Nov-02 4:31

Jose Cruz

1-Nov-02 4:31

The main reason of asking this in this forum, was because I found that the message handling of the events is handled in diferent ways. So the way is handled in MFC projects is not the same as in WTL projects.

So I rather be asking this to people of this forum because my project is an WTL/ATL project.

yeeeooowww29-Oct-02 1:31

yeeeooowww

29-Oct-02 1:31

hellooo ppl.. long time since I ventured to codeproject..
anyway... I've been facing this problem..

I have an activex dll written in vb that exposes a few methods..like

public function fn1(byval x a integer, byval y as integer) as integer

fn1 = x + y

end function

I want to use this in my mfc/ atl project... I used #import to import the dll and as vb exposes a smart pointer to my interface.. I used it to call my method... but I get a runtime error when the pointer is being created...

I would like to know the low-down on using components developed in vb.. is it possible to use them without using automation ..if yes how do I go about creating a custom no automation iterface in vb!

thks guys

One more addition to the addiction of coding!

If you want a helping hand, you'll find one at the end of your arm.

Re: using a activex dll created in vb in an atl/mfc component

ian mariano29-Oct-02 2:25

ian mariano

29-Oct-02 2:25

How exactly are you creating the instance of your COM object?

Are you (error checking and handling omitted):

_MyObjectPtr  pPtr("MyProject.MyObject");
pPtr->fn1(...);

_MyObjectPtr  pPtr;
pPtr.CreateInstance(__uuidof(_MyObject));
pPtr->fn1(...);

"The greatest danger to humanity is humanity without an open mind."
- Ian Mariano

http://www.ian-space.com/

LoadRegTypeLib Question

Anonymous28-Oct-02 12:58

Anonymous

28-Oct-02 12:58

Ok, given IID I can load the library....

And If I am given the path -> LoadTypeLib(Path) loads the library (perfect).

Is there any way when given IID discover dll, or exe server path/filename????

Thanks,
Brian

Re: LoadRegTypeLib Question

Anonymous29-Oct-02 0:23

Anonymous

29-Oct-02 0:23

Never mind QueryPathOfRegTypeLib

ostream we all scream

Todd Smith25-Oct-02 9:08

Todd Smith

25-Oct-02 9:08

What's the best way to stream a container?

inline std::ostream& operator<<(std::ostream& out, const MyClass& s)
{
    return out << s.m_SomeVar;
}

MyClass myClass;
std::cout << myClass;

how do I do the same but with a vector of MyClass?

std::vector<MyClass> myClasses;
std::cout << myClasses;

use for_each maybe?

std::for_each(m_PopProfiles.begin(), m_PopProfiles.end(), Something<std::cout>()); ??

Todd Smith

Re: ostream we all scream

Tim Smith25-Oct-02 9:46

Re: ostream we all scream

25-Oct-02 9:46

I found this on a web site. I am sure someone with a clue can post a better solution:

copy (l.begin(), l.end(), ostream_iterator(cout, ""));

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Todd Smith25-Oct-02 11:13

Todd Smith

25-Oct-02 11:13

Just what I needed. Thanks!

Todd Smith

Debuggin a Simple STL Algorithm :: STL

valikac24-Oct-02 21:12

24-Oct-02 21:12

Hi.

I would like to debug a simple algorithm that does not work using an STL solution. The solution works via iteration.

std::list<unsigned int=""> theList;

for (unsigned int i = 0; i < 10; ++i)
theList.push_back(i);

// theList should now contain 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.

// Remove "6" from the list.
// Assume that iTheList is an iterator that points to element with value 6.

theList.erase(iTheList);

// After erase() theList should now contain 0, 1, 2, 3, 4, 5, 7, 8, and 9.

Okay. Everything above works as designed. Now I would like to decrement everything bigger or equal to "6," thus make theList hold 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. Here is the iterative solution.

-----

// Given iTheList points to theList.begin().

while (*iTheList <= 6)
++iTheList

// Now decrement until end of theList.

while (*iTheList != theList.end()
{
*iTheList = *iTheList - 1;
++iTheList;
}

-----

The iterative solution above works perfect.

I would like to implement a more efficient and elegant solution. Here is one solution using STL algorithms. However, it does not work correctly.

-----

std::for_each(std::find_if(theList.begin(), theList.end(), std::bind2nd(std::greater<>, 6)), theList.end(), std::bind2nd(std::minus<>, 1));

-----

The STL solution above does not work. The logic and syntec seem to be valid.

Is there a logic or syntec misunderstanding in the STL solution? I looked over the function objects and function adapter. They are valid.

Thanks,
KUphryn

Tim Smith25-Oct-02 2:22

25-Oct-02 2:22

Why are you trying to replace simple code with a god awful stream of unreadable syntax that you have to work hard to actually get to work? That isn't programming, that is STL masturbation.

Stick with the simple solution. Of course, these days that isn't the politically correct answer. Laugh | :laugh:

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

valikac25-Oct-02 5:28

25-Oct-02 5:28

I see your point.

Kuphryn

Todd Smith25-Oct-02 11:29

Todd Smith

25-Oct-02 11:29

The problem is your find_if

What will find_if return in the following case? It will return an interator pointing to the beginning of the list which is the same as l.begin(). So it pretty much infinite loops.

std::find_if(l.begin(), l.end(), std::bind2nd(std::less<int>(), 100));

<b>Todd Smith</b>

valikac25-Oct-02 12:24

25-Oct-02 12:24

Okay. Thanks.

Fruny posted a solution at GameDev using transform().

http://www.gamedev.net/community/fo...topic_id=120974

Kuphryn

Tim Smith25-Oct-02 13:07

25-Oct-02 13:07

Damn, and I thought I had come close to having a convert away from those silly STL practices. Laugh | :laugh:

Link fix: http://www.gamedev.net/community/forums/topic.asp?topic_id=120974[^]

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

valikac25-Oct-02 13:19