Re: net connection - C / C++ / MFC Discussion Boards

great!

ns17-Mar-03 0:55

17-Mar-03 0:55

Thanks!

Appreciate your help,
ns

MDB or XML ???

cemlouis13-Mar-03 7:34

cemlouis

13-Mar-03 7:34

Hi,

A newbie question:

Nowadays, I am using ADO to access to my mdb file, when i first runs my app the harddrive is getting busy for a few(6-7) seconds to read the data. I want to know that if i use xml for data handling how my app will behave??? Is it fast or slow or what???

Thanx...

Re: MDB or XML ???

Nitron13-Mar-03 8:13

Nitron

13-Mar-03 8:13

X!M!L! .... X!M!L! .... X!M!L!... Wink | ;)

- Nitron

"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb

Re: MDB or XML ???

Joan M13-Mar-03 20:15

Joan M

13-Mar-03 20:15

It will depend on your needs:

XML is fast, clean and very interesting if you have only to ask for tree structured data, but if you need to use different queries on your database, you'd prefer to use a database because the work of create the different queries based on the different tables... will be done easier...

hope this helps...

net connection

dudic13-Mar-03 7:15

dudic

13-Mar-03 7:15

can anybody advise me, what do I have to do for providing steady connection, right receiving data, if server is written for Linux? can you tell me all the needed details for making this right. thank you.

Re: net connection

Rickard Andersson²⁰13-Mar-03 7:54

Rickard Andersson²⁰

13-Mar-03 7:54

Do you want to learn network programming?
Learn Winsock, how you create and connect to a server can you find here on CP. Look in the Network & Internet section.

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: net connection

valikac13-Mar-03 13:06

valikac

13-Mar-03 13:06

What do you mean "right?" Data is the same through a socket no matter where it originated.

Kuphryn

Re: net connection

dudic14-Mar-03 8:52

dudic

14-Mar-03 8:52

I am talking about such things like "htoln" and "ntohl" and it's usage

Is it possible to exit from a window (destroy it) before to finish to process a WM_TIMER message in the same window?

Joan M13-Mar-03 7:08

Joan M

13-Mar-03 7:08

Hello,

let's say we gave window A and in that window I process a WM_TIMER message.

The timer message arises from another window (SendMessage(WM_TIMER...)) each 10 ms...

I want to know if it is possible to destroy the window while the WM_TIMER handler is being processed.

PS:
I'm searching for a memory leak:
during the WM_TIMER message I allocate and deallocate some memory, and in one hand if I enter and exit the window continuously, the memory gets leaked. In the other hand if I do it slowly the memory gets freed as it should be...

Thank you in advance

Re: Is it possible to exit from a window (destroy it) before to finish to process a WM_TIMER message in the same window?

Gary R. Wheeler13-Mar-03 10:44

Gary R. Wheeler

13-Mar-03 10:44

One problem here is that you are misusing the WM_TIMER message. It would be better to have the second window to send a user-defined message (based on WM_USER or WM_APP).

Secondly, since you are using SendMessage, the second Window is blocked until the first Window processes the message. WM_TIMER messages receive special handling by Windows. Essentially, WM_TIMER messages are only processed by a window when it has no other messages in its queue. They are the least priority messages of all. Without seeing your code, this may be the source of your problem, in that the WM_TIMER handler isn't being called as many times are you are issuing it.

Software Zen: delete this;

Re: Is it possible to exit from a window (destroy it) before to finish to process a WM_TIMER message in the same window?

Joan M13-Mar-03 21:06

Joan M

13-Mar-03 21:06

Hello,

Gary R. Wheeler wrote:
this may be the source of your problem, in that the WM_TIMER handler isn't being called as many times are you are issuing it

Could you explain it again? sorry, but I do not understand this very well:

You are telling me that the sending of the message is what occupies memory?

I like the fact of the WM_TIMER message has the least priority, because I'm using it in order to refresh some values:

NOTE:
I have an external programming language that allows me to read from sensors and to send signals to actuators (moving machines), and I need to get info. from that program, as it don't have callback functions that would allow me to do that I use timer events, and each 10ms I spread the WM_TIMER message from my main window to all their visible childs.  Once the WM_TIMER message is received I process those variables.

I have tried to place a for( ;; ) before the portions of code that could generate memory leaks, but I've seen using the task administrator and other tools from Microsoft and I've noticed that the memory remains OK.

The fact is that if I enter the dialog (the one that seems to leak memory) and wait a little bit, and then I exit it seems that the memory is not being occupied, but in the other hand, if I enter and exit the same dialog fast and continuously then the memory seems to be leaked... Dead | X|

I'm very stuck by now, and this is part of a project that is already working, but after some hours the PC gets down, I need to solve this, could you try to find out something using the info I've given to you?

Thank you in advance.

Re: Is it possible to exit from a window (destroy it) before to finish to process a WM_TIMER message in the same window?

Joan M13-Mar-03 22:20

Joan M

13-Mar-03 22:20

Hello, I'm posting this here in order to avoid you working for nothing:

I'm sure that the problem is not in my timer (I've deleted it) and the problem is still here (moreover this method of working has been used by me for a long time 3 years at least and this has never happened...).

I've noticed that some DLL's related to the internet explorer, fails and generate an exception the first time that the dialog is shown, I'll post another question in the forum in order to try to get help, but after all, thank you for your reply.

Re: Is it possible to exit from a window (destroy it) before to finish to process a WM_TIMER message in the same window?

TomKat14-Mar-03 14:58

TomKat

14-Mar-03 14:58

hit an exit(0)
it does wonders !

//be cool

I am the mighty keeper of the book on knowledge . Contact me to get your copy .

Where is Depends 2.x in VS.NET

cemlouis13-Mar-03 6:44

cemlouis

13-Mar-03 6:44

Hi there,

When i was using VC++ 6 i was using Depends 2.x for looking for dlls and other external files that my project uses. Now i had to transfer my projects to VS.NET and i couldn't find Depends 2.x in the package series so if anybody knows how can i look the dlls that my releases are using plz reply to this post... Thanx...

Re: Where is Depends 2.x in VS.NET

Big Art13-Mar-03 6:55

Big Art

13-Mar-03 6:55

It is in:

...\Microsoft Visual Studio .NET\Common7\Tools\Bin

but I think you may have had to specify that you wanted the tools installed as part of your studio installation.

If you don't have it maybe someone knows where you can download it from Microsoft. It is a great little tool.

Art

Re: Where is Depends 2.x in VS.NET

cemlouis13-Mar-03 7:24

cemlouis

13-Mar-03 7:24

I have it... Thanx for your help...

Re: Where is Depends 2.x in VS.NET

Michael Dunn13-Mar-03 7:50

Michael Dunn

13-Mar-03 7:50

You can get the latest version from www.dependencywalker.com[^]

--Mike--
THERE IS NO THERE IS NO BUT THERE IS MAGIC PIXIE DUST BUSINESS GENIE CODE PROJECT

Homepage | RightClick-Encrypt | 1ClickPicGrabber

How to debug ATL COM DLL with ASP

mdivatia@hotmail.com13-Mar-03 6:35

mdivatia@hotmail.com

13-Mar-03 6:35

This may be elementary to most of you gurus. I have an ATL COM DLL which I instantiate from ASP (using Server.CreateObject). If I want to debug it, what should I do ? I tried follwing: Project->Settings->Debug->Executable for debug session = IEXPLORE.EXE - I am able to put the break points but it would not stop on the break points. If I use a small app written in VB for the same purpose, I am able to debug.

Please help,
Thanks

Re: How to debug ATL COM DLL with ASP

Hesham Amin13-Mar-03 6:41

Hesham Amin

13-Mar-03 6:41

Hi..
I think you should choose InetInfo not IEXPLORE .. its the IIS which processes asp not the browser...

Re: How to debug ATL COM DLL with ASP

mdivatia@hotmail.com13-Mar-03 8:00

mdivatia@hotmail.com

13-Mar-03 8:00

Can you please tell me how to do that ? I tried attaching the inetinfo process but the breakpoint would still not stop execution of the program. Thanks.

Re: How to debug ATL COM DLL with ASP

Brian Shifrin13-Mar-03 8:08

Brian Shifrin

13-Mar-03 8:08

Right Idea, wrong executable:

If you are using iis4 try inetinfo, else for Com+ attach to DLLHOST.EXE.

Brian

problem with trivial MFC app

Mister Transistor13-Mar-03 6:27

Mister Transistor

13-Mar-03 6:27

As testing for a real MFC application I made a trivial one, but ran in to problems. To my mind this exemplifies the difficulties faced by the newbie to MFC and doc/view.

I wanted a single-window MFC doc/view app with a static control on the window.

I used AppWizard to make an MFC EXE. It ran and showed an empty window.
I put my static control in the view .h file
private:
CStatic Statcontrol;
Now I made my ..Create() in the view .cpp file
RECT rect = {100,100,200,200};
Statcontrol.Create("hello",WS_CHILD | WS_VISIBLE | SS_CENTER,rect,this,ID_STAT);
But where do I put this code? In the view constructor it fails. In PreCreateWindow() it fails. All I get is a FALSE return - not much diagnostics. (But I guess 'this' is wrong). In the OnDraw() handler it works! But then it's called multiple times.

Help! Why is something so simple so difficult? MFC books never help with things like this.

Andrew

MisterTransistor - germanium is King

Re: problem with trivial MFC app

Gary Kirkham13-Mar-03 6:43

Gary Kirkham

13-Mar-03 6:43

Try putting it in your view class OnInitialUpdate function leave

CStatic Statcontrol in the header...should work

Gary Kirkham

A working Program is one that has only unobserved bugs

I thought I wanted a career, turns out I just wanted paychecks

Re: problem with trivial MFC app

Mister Transistor13-Mar-03 21:54

Mister Transistor

13-Mar-03 21:54

Gary,
thanks - that has indeed fixed it.
You don't by chance know a good book/article that explains the principles of MFC programming rather than just showing which menus to click?

cheers
Andrew

Re: problem with trivial MFC app

Gary Kirkham15-Mar-03 9:06

Gary Kirkham

15-Mar-03 9:06

I am kind of partial to "Inside Visual C++" by Kruglinski.

I have found that the best way to learn MFC is by doing. I have never learned much from reproducing book examples. I came from a C, Basic, FORTRAN, assembly language background. I learned the most by taking one of my old programs and making a MFC application out of it. I already knew how the meat of the program worked, so I could just concentrate on the GUI interface. I would use the programming books I bought (I own quite a few) and use the coding examples that applied to the program I was writting.

It may not be the best way to learn MFC, but it worked for me.

Gary Kirkham

A working Program is one that has only unobserved bugs

I thought I wanted a career, turns out I just wanted paychecks

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