C / C++ / MFC

Re: Hum, sound like IM Messenger.

20-May-01 2:33

when we did something similar we had a central authentication server (can have fall-over backups too) that would the username & password thing ... if a user was verified this server would respond with an access token as well as an ip address and port number for the client to connect to for the actual service ... the server they log on to gets sent the access token from the client which it then tries to verify with the authentication server

hope thats clear enough (was at a party last night) ... not saying its the best way to do things but it worked

---
"every year we invent better idiot proof systems and every year they invent better idiots"

Masaaki Onishi20-May-01 5:00

Masaaki Onishi

20-May-01 5:00

Hello, the codegurus around the world.;)

Hum, this question sounds like IM Messenger.
Actually, I used to make Client\Server application on my school project for a long time ago.
And I enhanced Server can access Access Database. (but, not thread safe. Cry | :((

)
That is, the client types user id and password, and server queris these from Access database.

So, now I have an idea to enhance this application to IM Messenger.
So, Central Server gets the dynamic IP address and port number if the user login Internet.
And these data goes to SQL Server.
So, acutally, the user's client application includes the server program to commnicate to
the other client machine.
This sounds like COOL. Cool | :cool:

I guess that Napster uses the same concept.
However, Gulant(?) uses the multicase approaches to find the client.
This is more cool, isn't this. More Cool | :cool:

.
This is mainly because Culant doesn't need the central server. Big Grin | :-D

Have a nice day!
-Masaaki Onishi-

Re: Hum, sound like IM Messenger.

l a u r e n20-May-01 10:54

20-May-01 10:54

the reason we had a central server was for authentication services ... it allowed us to keep all authentication databases on a single safe server ... the load wasn't much as it only authenticated and then handed off to another server / port

we also used port switching if we detected an unauthorised connection ... we assumed it was an attack and instructed all clients to switch to other ports

worked quite well Smile | :)

---
"every year we invent better idiot proof systems and every year they invent better idiots"

MySql++

Stephen Caldwell19-May-01 18:53

Stephen Caldwell

19-May-01 18:53

I'm trying to add MySql connectivity to my application, but i don't want to have to use ODBC. When i ad the mysql++ header file to my application i get these errors:

d:\development\sources\mysql++\mysql\include\mysql_com.h(115) : error C2146: syntax error : missing ';' before identifier 'fd'
d:\development\sources\mysql++\mysql\include\mysql_com.h(115) : error C2501: 'SOCKET' : missing storage-class or type specifiers
d:\development\sources\mysql++\mysql\include\mysql_com.h(115) : error C2501: 'fd' : missing storage-class or type specifiers

I include winsock2.h but all that ends up doing is causing redefiniton errors in the rest of the app. I was able to find a way to get it to compile, but whenever I try to use a certain class i get this:

msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: virtual __thiscall std::basic_ios<char,struct std::char_traits<char=""> >::~basic_ios<char,struct std::char_traits<char=""> >(void)" (??1?$basic_ios@DU?$char_traits@D@std@@@std@@UAE@XZ) already defined
in mysql++.lib(sql_query.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: virtual __thiscall std::basic_iostream<char,struct std::char_traits<char=""> >::~basic_iostream<char,struct std::char_traits<char=""> >(void)" (??1?$basic_iostream@DU?$char_traits@D@std@@@std@@UAE@XZ) a
lready defined in mysql++.lib(sql_query.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_iostream<char,struct std::char_traits<char=""> >::basic_iostream<char,struct std::char_traits<char=""> >(class basic_iostream<char,struct std::char_traits<char=""> >::basic_streambuf<
char,struct std::char_traits<char> > *)" (??0?$basic_iostream@DU?$char_traits@D@std@@@std@@QAE@PAV?$basic_streambuf@DU?$char_traits@D@std@@@1@@Z) already defined in mysql++.lib(sql_query.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: virtual __thiscall std::basic_streambuf<char,struct std::char_traits<char=""> >::~basic_streambuf<char,struct std::char_traits<char=""> >(void)" (??1?$basic_streambuf@DU?$char_traits@D@std@@@std@@UAE@XZ
) already defined in mysql++.lib(sql_query.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::_Lockit::~_Lockit(void)" (??1_Lockit@std@@QAE@XZ) already defined in mysql++.lib(sql_query.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >(void)" (??1?$basic_strin
g@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in mysql++.lib(connection.obj)
libcp.lib(locale.obj) : error LNK2005: "public: __thiscall std::_Locinfo::_Locinfo(char const *)" (??0_Locinfo@std@@QAE@PBD@Z) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(locale.obj) : error LNK2005: "public: __thiscall std::_Locinfo::~_Locinfo(void)" (??1_Locinfo@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(locale0.obj) : error LNK2005: "public: class std::locale::facet const * __thiscall std::locale::_Getfacet(unsigned int,bool)const " (?_Getfacet@locale@std@@QBEPBVfacet@12@I_N@Z) already defined in msvcprtd.lib(MSVCP60D.dll)
libcp.lib(locale0.obj) : error LNK2005: "public: bool __thiscall std::locale::_Iscloc(void)const " (?_Iscloc@locale@std@@QBE_NXZ) already defined in msvcprtd.lib(MSVCP60D.dll)

etc...

Has anyone found a way around this bug(?)?. Could suggest a better way to manage a database without using
mySql. I can't use Access so don't suggest it. Thanx in advance.

Stephen Caldwell
Desick Information Technologies

Re: MySql++

l a u r e n20-May-01 2:35

20-May-01 2:35

use msde

---
"every year we invent better idiot proof systems and every year they invent better idiots"

Re: MSDE?

Masaaki Onishi20-May-01 7:34

Masaaki Onishi

20-May-01 7:34

Hello, the codegurus around the world.;)

What is MSDE?
Just kidding. Poke tongue | ;-P

As far as I know, MSDE only works for the test on Client machine.
So, I guess that we can't use MSDE as SQL Server does on Window NT Server.

One more thing.
Don't update to the beta of SQL 2000 from MSDE CD
This overwrites ADO library, so we must rewrite the code. Cry | :((

If we have VC++, we can get this free MSDE CD. Cool | :cool:

Have a nice day!
-Masaaki Onishi-

Re: MSDE?

Anders Molin20-May-01 8:54

Anders Molin

20-May-01 8:54

As far as I know, MSDE only works for the test on Client machine. So, I guess that we can't use MSDE as SQL Server does on Window NT Server

MSDE runs on both Win NT workstation and Server, and is 100% compatible with Sql Server 7.0...

Is is a Sql Server 7.0, just with some performance limitations.

- Anders

Money talks, but all mine ever says is "Goodbye!"

Masaaki Onishi20-May-01 11:56

Masaaki Onishi

20-May-01 11:56

Hello, the codegurus around the world.;)

You're right partly.
I mean that the client can't access MSDE through the network, can it?

If MSDE works as SQL Server, we don't need to buy SQL Server at all.
MSDE is only the test Database server if the developer makes a test for his or her code to
the client enviornment. (127.0.0.1).
So, MSDE works on Window NT server, but this is only for the local host enviornment.

If i am wrong, I'm happy since I don't need SQL Server at all. Confused | :confused:

Have a nice day!
-Masaaki Onishi-

Anders Molin20-May-01 12:07

Anders Molin

20-May-01 12:07

You are wrong...

MSDE is not for test... On the MSDE CD there is a Sql Server 7.0 Developer Edition, that you can use for test. MSDE is for production.

It works perfectly over network, just as the "real" SQL Server.
But, when more than 10 clients is connecting to MSDE at the same time, it starts to get way slower than the "real" Sql Server.

If you only are 5 persons in a business, there is NO difference in the use of MSDE and Sql Server... (except that there are no admin tools installed when you install MSDE)

Trust me, I know MSDE as we use it on some of our solutions...

- Anders

Money talks, but all mine ever says is "Goodbye!"

l a u r e n20-May-01 21:26

20-May-01 21:26

hey anders Smile | :)

where did you get the info about slow-down after 10 users? we use msde in production too (thats how come i knew masaaki was in error too) ... and i would like to know some definitive source of info (if there is one) thats states the 10 user issue so i can give reasons for some of our clients to foot the upgrade bill if required

thanks

---
"every year we invent better idiot proof systems and every year they invent better idiots"

Getting URL from File Download Launched by CHtmlView

Anders Molin20-May-01 21:35

Anders Molin

20-May-01 21:35

Hmmm, actually it look like it's 5 users...

Take a look at http://msdn.microsoft.com/vstudio/msde/examining.asp

- Anders

Money talks, but all mine ever says is "Goodbye!"

User 1278219-May-01 17:17

User 12782

19-May-01 17:17

I have a CHtmlView based app. How can I detect when the app creates a download file dialog? I would also like to get the url of the file it is trying to download.

Thanks in Advance

modified 12-Jul-20 21:01pm.

What are these messages pointing too??

19-May-01 15:08

Hello,

I was wondering if someone could point me to the documentation that describes what DATA specific MESSAGES pass to there call back functions.

Example:

A ListCtrl has the message of NM_CLICK. It gets mapped to a fucntion like this

CMyDialog::OnClickList(NMHDR* pNMHDR, LRESULT* pResult)

Now How in the hell am I supposed to know what type of data pNMHDR is pointing to?

I guesse it is pointing to a LPNMITEMACTIVATE, but the only reason I know this is becuase i found it in someones code, not in any documentation.

This question is not focused on a CListCtrl. Im talking about any MFC contro;. What are the are there passed arguments pointing to??

Is there documentation on this? Am i just blind and its right in front of me?
Any Help would be appreciated.
Smile | :)

Thanks.

Re: What are these messages pointing too??

Michael Dunn19-May-01 15:49

Michael Dunn

19-May-01 15:49

How in the hell am I supposed to know what type of data pNMHDR is pointing to?

You just read the docs on the message in question. Enter "NM_CLICK" into the MSDN Index page, and you'll see a few entries. Select "NM_CLICK (list view)".

As for how the parameters get passed to the OnClickList() function, MFC handles the raw WM_NOTIFY message, unpacks the parameters (from wParam and lParam), looks up your handler in the class's message map, and calls the handler.

--Mike--
http://home.inreach.com/mdunn/
Tables, ladders, chairs, OH MY!

ExitWindowsEx

19-May-01 12:02

I have a problem with ExitWindowsEx. AFAIK, using EWX_SHUTDOWN with that API function causes the system to shut down, right? Well, what happens is that the system logs off!!!!!!!!
My computer shuts down normally when I choose shut down from the start menu and restarted normally by setup programs.
What is going on???

Thanx

Winsock Woes

Stephen Caldwell19-May-01 8:44

Stephen Caldwell

19-May-01 8:44

I was able to solve my own problem. Thanx anyway.

*Obsolete*
I'm creating a multithreaded server application using winsock. So far everything works well except when i try to send data to the client. I get a WSAEINVAL(10022) error on the Send() function. Here's the code:

UINT PASCAL CLJFileServer::ListenProc(LPVOID *pParam)
{
CLJFileServer *pThis;
pThis = (CLJFileServer*)pParam;

if (!pThis)
return 1;

CTimeoutSocket* pClient = NULL;
CTimeoutSocket* pListen = new CTimeoutSocket();

int nLoopCount;
while (!pListen->Create(pThis->m_uPort))
{
Sleep(LJFS_TIMEOUT);
nLoopCount++;
if (nLoopCount > LJFS_SOCKET_RETRY)
{
pThis->m_hListen = NULL;
pThis->StartListening();
return 1;
}
}

pListen->Listen();

while(pThis->m_bStop != true)
{
if (pClient)
delete pClient;

pClient = new CTimeoutSocket;
pListen->SetTimeout(LJFS_TIMEOUT);
int bAccepted = pListen->Accept(*pClient);
if (bAccepted)
{
pThis->SendAck(pClient);

if (pThis->m_uServerType == LJFS_LISTEN)
pThis->Login(pClient);
else
pThis->ForwardConnection(pClient);
}

}
if (pClient)
delete pClient;

pListen->Close();
delete pListen;
pThis->m_hListen = NULL;
return 0;
}

void CLJFileServer::SendAck(CTimeoutSocket *pClient)
{
//pClient->Bind(LJ_FSPORT);
TRACE("Error No: %d", GetLastError());
if(m_uServerType = LJFS_LISTEN)
{
pClient->Send((void*)LJ_LOGINACK,sizeof(LJ_LOGINACK));
TRACE("Error No: %d", GetLastError());
}
else
pClient->Send((void*)LJ_METASERVER,sizeof(int));
}

Thanx for your help in advance.

Stephen Caldwell
Desick Information Technologies

static CArray

derhackler19-May-01 3:41

19-May-01 3:41

Bonjour! when i try to define a CArray as a static class member i get a link error. what's the problem, and how can i solve it? thx

derhackler

Igor Sukhov19-May-01 7:52

19-May-01 7:52

Please provide error description (or source of your class) to give us the idea of your problem.

Best regards,

-----------
Igor Soukhov (Brainbench/Tekmetrics ID:50759)
igor_soukhov@yahoo.com | ICQ:57404554 | http://siv.da.ru

derhackler19-May-01 7:58

19-May-01 7:58

this is the code of the header file:

#include <afxtempl.h>

class CPropertyList
{
public:
CPropertyList();
virtual ~CPropertyList();

public:
static CString fnGetADsProperty(int intArg);
static CString fnGetADsProperty(CString cstrArg);
static int fnGetIntProperty(CString cstrArg);
static CString fnGetProperty(int intArg);
static CString fnGetProperty(CString cstrArg);

//Statische members
static CArray<cstring,cstring&> cstraProperty;
static CArray<cstring,cstring&> cstraADsProperty;
static CArray<int,int> intaProperty;
};

this ist the error i get (for each CArray)

PropertyList.obj : error LNK2001: Nichtaufgeloestes externes Symbol "public: static class CArray<class cstring,class="" cstring="" &=""> CPropertyList::cstraProperty" (?cstraProperty@CPropertyList@@2V?$CArray@VCString@@AAV1@@@A)

any ideas?

derhackler

es ist wie es ist und es ist und es ist fürchterlich

Igor Sukhov19-May-01 8:09

19-May-01 8:09

CArray is the template class - so you need to provide template parameters!
Like that:

class CPropertyList
{
...

static CArray<cyourclass, cyourclass&=""> cstraProperty;
static CArray<cyourclass, cyourclass&=""> cstraADsProperty;
static CArray<cyourclass, cyourclass&=""> intaProperty;

};

and your always must define static variables (the code above is the declaration only!):
this code your should place out of class declaration! (most of us placing this in CPP file Wink | ;)

:

CArray<cyourclass, cyourclass&=""> CPropertyList::cstraProperty;
.. the same for others static members.

Hope it'll help.

#include

class CPropertyList
{
public:
CPropertyList();
virtual ~CPropertyList();

public:
static CString fnGetADsProperty(int intArg);
static CString fnGetADsProperty(CString cstrArg);
static int fnGetIntProperty(CString cstrArg);
static CString fnGetProperty(int intArg);
static CString fnGetProperty(CString cstrArg);

//Statische members
static CArray cstraProperty;
static CArray cstraADsProperty;
static CArray intaProperty;
};

this ist the error i get (for each CArray)

PropertyList.obj : error LNK2001: Nichtaufgeloestes externes Symbol "public: static class CArray CPropertyList::cstraProperty" (?cstraProperty@CPropertyList@@2V?$CArray@VCString@@AAV1@@@A)

any ideas?

derhackler

Best regards,

-----------
Igor Soukhov (Brainbench/Tekmetrics ID:50759)
igor_soukhov@yahoo.com | ICQ:57404554 | http://siv.da.ru

Igor Sukhov19-May-01 8:11

19-May-01 8:11

:

CArray<cyourclass, cyourclass&=""> CPropertyList::cstraProperty;
.. the same for others static members.

Hope it'll help.

ps: just've seen your post on codeguru Wink | ;)

#include

class CPropertyList
{
public:
CPropertyList();
virtual ~CPropertyList();

public:
static CString fnGetADsProperty(int intArg);
static CString fnGetADsProperty(CString cstrArg);
static int fnGetIntProperty(CString cstrArg);
static CString fnGetProperty(int intArg);
static CString fnGetProperty(CString cstrArg);

//Statische members
static CArray cstraProperty;
static CArray cstraADsProperty;
static CArray intaProperty;
};

this ist the error i get (for each CArray)

PropertyList.obj : error LNK2001: Nichtaufgeloestes externes Symbol "public: static class CArray CPropertyList::cstraProperty" (?cstraProperty@CPropertyList@@2V?$CArray@VCString@@AAV1@@@A)

any ideas?

derhackler

Best regards,

-----------
Igor Soukhov (Brainbench/Tekmetrics ID:50759)
igor_soukhov@yahoo.com | ICQ:57404554 | http://siv.da.ru

Igor Sukhov19-May-01 8:11

19-May-01 8:11

:

CArray<cyourclass, cyourclass&=""> CPropertyList::cstraProperty;
.. the same for others static members.

Hope it'll help.

ps: just've seen your post on codeguru Wink | ;)

Igor Sukhov19-May-01 8:13

19-May-01 8:13

Hell, the system eats brackets Wink | ;)

Best regards,

-----------
Igor Soukhov (Brainbench/Tekmetrics ID:50759)
igor_soukhov@yahoo.com | ICQ:57404554 | http://siv.da.ru

derhackler19-May-01 8:16

19-May-01 8:16

i've seen it. Cool | :cool:

derhackler19-May-01 8:15