About Strtok - C / C++ / MFC Discussion Boards

How to get running OPC servers in the network?

Member 475076128-May-08 4:29

28-May-08 4:29

Hi I am struck with the following problem. I want to get all running servers in the current network using C#. I searched a lot in google an msn but no information related to my issue came. Please any one can help me regarding this issue.

Thanking you.

Re: How to get running OPC servers in the network?

Rajesh R Subramanian28-May-08 4:40

Rajesh R Subramanian

28-May-08 4:40

Member 4750761 wrote:
using C#

Please ask C# questions in the C# forum[^].

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: How to get running OPC servers in the network?

Randor 28-May-08 5:54

Randor

28-May-08 5:54

The question you are asking makes no sense in its current form. OPC is an automation standard which can be implemented on any communication layer. I am assuming that you have some industrial PLC which are probably communicating over a serial pair using Modbus or whatever protocol and you probably want to talk to an OPC server over a cat-5 network and log some data about each node. Unfortunately you have not given enough details to form a response.

Your question really isn't C++ nor C# related. I would suggest contacting the support group where you purchased your OPC server software and/or contacting the PLC manufacturer.

Best Wishes,
-David Delaune

How to resolve this err.

KASR128-May-08 2:08

KASR1

28-May-08 2:08

error C2664: 'MessageBoxW' : cannot convert parameter 2 from 'const char [4]' to 'LPCWSTR'

Also i would like to see the char manipulations samples(Link).

Re: How to resolve this err.

Cedric Moonen28-May-08 2:25

Cedric Moonen

28-May-08 2:25

It is because UNICODE is defined. This article[^] explains all you need to know Smile | :)

Cédric Moonen
Software developer

Charting control [v1.4]

Re: How to resolve this err.

CPallini28-May-08 2:26

CPallini

28-May-08 2:26

Two alternatives:
(1) Change the Character Set option of your project (currently is Use Unicode Character Set). You can do this selecting Project->Properties menu item, then Configuration Properties->General node and finally the Character Set list item.

(2) Change you variable type. For instance

char msg[]="foo";

should become

TCHAR msg[]=_T("foo");

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

Re: How to resolve this err.

SandipG 28-May-08 2:41

SandipG

28-May-08 2:41

for converting const strings to wide char you can just add L.
e.g. L"SomeText".

About Strtok

savitri28-May-08 1:32

savitri

28-May-08 1:32

Hi everybody..

I am doing project on gsm modem.i am reading msg from sim.that read message i want to store into database.for that i have split that sentence so please tell me how to do that.. i am doing like this..
char str[1000];
strcpy(str,m_sResults);
MessageBox(str);
char delims[] = ",";
char* result;
result = strtok( str, delims );

while(result != NULL )
{
MessageBox(result);

result = strtok( NULL, delims );

}
but doing like this is impossible to store the values.so i want to store in different variables.please help me out.
in m_sResults the sentence is
AT+CMGR=1

+CMGR: "REC READ","919860716641","P apu.soni","08/05/22,19:05:34+34",145,4,0,0,"919890081132",145,106
Call me when you reach to your pg... I on the way to room..

OK

please help me.

thanks in advance,
savitri Confused | :confused:

Re: About Strtok

Nibu babu thomas28-May-08 1:52

Nibu babu thomas

28-May-08 1:52

Don't use strtok since internally it uses a static buffer which will cause problem with calls from multiple threads or simultaneous calls on different strings.

Instead use strtok_s/_tcstok_s, a demo -> http://www.tenouk.com/cpluscodesnippet/viewtopic.php?p=474[^]

Use vector<string> to store strings that are tokenized by this function.

Nibu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: About Strtok

Graham Bradshaw28-May-08 13:06

Graham Bradshaw

28-May-08 13:06

Nibu babu thomas wrote:
cause problem with calls from multiple threads or simultaneous calls

Mutliple threads is OK, apparently. See http://msdn.microsoft.com/en-us/library/2c8d19sb(VS.71).aspx[^]

Re: About Strtok

Nibu babu thomas28-May-08 17:01

Nibu babu thomas

28-May-08 17:01

Graham Bradshaw wrote:
Mutliple threads is OK, apparently.

Thanks Graham!

Nibu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: About Strtok

bob1697228-May-08 2:07

bob16972

28-May-08 2:07

don't use the token related functions for delimited file streams as they are dumb when faced with somthing like...

One,Two,Three,,,Six,Seven,...

It treats the three consecutive commas as one which could lead to unexpected results if those delimiters should be treated as "nothing" values for their respective indexes.

Re: About Strtok

Jijo.Raj28-May-08 8:55

Jijo.Raj

28-May-08 8:55

You can also use stringstream to parse strings. Since I couldn't find a reference, i wrote a quick sample. Check it below.

#include "string"
#include "vector"
#include "sstream"
...

string sResult(_T("Hello,can,you,split,me?")); // Your result string.
istringstream ResultParser( sResult );  // Input string stream.

string sToken;
vector<string> vResults;

// Tokenize strings.
while ( getline( ResultParser, sToken, ',' ))
{
    // print tokens to console.
    vResults.push_back( sToken );
}</string>

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Little conversion problem

Ritxi28-May-08 1:18

Ritxi

28-May-08 1:18

Hi. I have a little question:

I need to convert a memory direction printed on a CString variable, to a LPVOID variable. Example:

CString auxstr;
auxstr.Format(_T("%p"),p_Stereo);  //p_Stereo is a pointer to a class

//In this point I have the pointer "saved" as a CString
//and now I want to retrieve the pointer in a LPVOID variable

LPVOID pointer = (LPVOID) ??????? variter->second.value;

I don't know how to convert this string to be able to cast it as a LPVOID. Anyone knows how? Thanks.

Ricard

Re: Little conversion problem

Nelek28-May-08 1:26

Nelek

28-May-08 1:26

Well as the pointer adresses are 0xADRESS, should you not convert from CString into Hex and then make the assignment?

Greetings.
--------
M.D.V. Wink | ;)

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
“The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson
Rating helpfull answers is nice, but saying thanks can be even nicer.

Re: Little conversion problem

Ritxi28-May-08 1:33

Ritxi

28-May-08 1:33

Yes, I suppose I should. But I can`t find this conversion (from cstring to hex). Is this from the atoi, atof...family? Can't find this.

Thank you so much.

Re: Little conversion problem

Nibu babu thomas28-May-08 1:34

Nibu babu thomas

28-May-08 1:34

Use strtol function. Specify base as 16.

e.g.

const long Val = strtol( "0xffff", NULL, 16 );

Nibu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: Little conversion problem

Ritxi28-May-08 3:02

Ritxi

28-May-08 3:02

This works perfectly....but as you can see, now i have many doubts for it to be the best solution. The overall plan, not yours.

Thank you..

Re: Little conversion problem

Cedric Moonen28-May-08 1:36

Cedric Moonen

28-May-08 1:36

The question, why do you store the address in a CString object in the first place ? Can't you simply store it directly in your LPVOID pointer ? It seems a bit crazy to use a CString in between.

Cédric Moonen
Software developer

Charting control [v1.4]

Re: Little conversion problem

Ritxi28-May-08 1:39

Ritxi

28-May-08 1:39

No i can't. It's the way my program sends information between program blocks. In most cases they just send numbers or strings, but now i need to send an object.

Re: Little conversion problem

Cedric Moonen28-May-08 1:51

Cedric Moonen

28-May-08 1:51

Yeah, but why do you store that address in a CString instead of simply sending the address ? You can only exchange CString objects ?

Cédric Moonen
Software developer

Charting control [v1.4]

Re: Little conversion problem

CPallini28-May-08 2:00

CPallini

28-May-08 2:00

Ritxi wrote:
It's the way my program sends information between program blocks.

Basically your 'programs blocks' communicate via e-mail. This is crazy programming, isn't it?
Smile | :)

Re: Little conversion problem

Nelek28-May-08 2:44

Nelek

28-May-08 2:44

CPallini wrote:
This is crazy programming, isn't it?

I don't know if that is the case, but client/boss specifications sometimes (more than desirable) are "crazy"

Greetings.
--------
M.D.V. Wink | ;)

Re: Little conversion problem

Ritxi28-May-08 2:48

Ritxi

28-May-08 2:48

Yes they are....but it's been my design. so...i am.

Re: Little conversion problem

CPallini28-May-08 2:51

CPallini

28-May-08 2:51

Nelek wrote:
but client/boss specifications sometimes (more than desirable) are "crazy"

I agree, indeed they are often crazy. Anyway communication details between program blocks should not be affected by client/boss specification, since it is matter of technical implementation.
Smile | :)

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