C / C++ / MFC Discussion Boards

Re: Very Basic socket programming, Winsock! Newb help..

Mark Salsbery14-Sep-07 12:39

14-Sep-07 12:39

Hi Cliff,

I forgot to mention....

The listening socket is separate. Once it is placed in a listening state, that's
all it does. For that socket, you'd want to use the FD_ACCEPT flag to get a window message
when a client tries to connect.

The WSAAsyncSelect() calls can be made any time after the sockets are created.

Generally, it's done something like this....

For the listening socket, call WSAAsyncSelect(...FD_ACCEPT) after you call listen(), then
return to your GUI or whatever. When you get a message indicating FD_ACcept to your
window, THEN call accept().

For the client end of the connection, call WSAAsyncSelect(...FD_CONNECT) right after you
create the socket. Then set the socket to non-blocking mode using ioctlsocket(), something like:

DWORD dwNonBlockingMode = 1;
::ioctlsocket(hSocket, FIONBIO, &dwNonBlockingMode);

Call connect() on the socket and return to the GUI - your window will receive the message when
connection is complete. When you receive the connect completion message, call
WSAAsyncSelect(...FD_READ|FD_CLOSE) on the socket to start receive and close notifications.

For the server end of the connection, when you receive an accept notification,
call accept() to create the connection socket.
~~Set this socket to non-blocking mode using ioctlsocket() as shown above~~,
then call WSAAsyncSelect(...FD_READ|FD_CLOSE) to start receive and close
notifications.

Make sense?

Mark

*EDIT* I crossed out the parts about setting the sockets to non-blocking.
Calling WSAAsyncSelct() does this for you Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Very Basic socket programming, Winsock! Newb help..

Beaon17-Sep-07 5:49

Beaon

17-Sep-07 5:49

It sure does. Thanks again! I got today off so as soon as I get home I will be working on this!

Thanks for everything! =)

Re: Very Basic socket programming, Winsock! Newb help..

Beaon17-Sep-07 9:21

Beaon

17-Sep-07 9:21

Hey check this out, It works!

Mark your the man!

Thanks for all the help buddy!

I'm so excited. Now I am going to learn how to make my app look prettier then the default windows stuff.

Lots of learning to do!!! =) Big Grin | :-D

Cliff

Cliff

Re: Very Basic socket programming, Winsock! Newb help..

Mark Salsbery17-Sep-07 9:43

Mark Salsbery

17-Sep-07 9:43

Kewl! No problemo.

Have fun,
Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Displaying text in non-english language on console [modified]

ComplexLifeForm12-Sep-07 7:02

ComplexLifeForm

12-Sep-07 7:02

Hi,
I am trying to display non-english text on the std console. I have tried various methods like
setconsole, _wsetconsole etc.. Defined _UNICODE and UNICODE macros also used wstring, wcout thinking that wide char variant might print the non-english text. Below is my sample program

#include <iosstream>
#include <locale>
using namespace std;

int_tmain()
{
wstring nonEnglishName = _TEXT("槧雲鼻");
wcout.imbue(locale("jpn");
wcout << _TEXT("Name in japanese is = ") << nonEnglishName.c_str() << endl;

return 0;
}

The output I am getting is = Name in japanese is = ₧▀ë_ò@

My system locate is still set to US_ENGLSH and I do not want to change it.
Can anybody please guide me regarding the correct procedure for displaying non-english text on the console?

Thanks

-- modified at 13:46 Wednesday 12th September, 2007

Re: Displaying text in non-english language on console

Matthew Faithfull12-Sep-07 8:21

Matthew Faithfull

12-Sep-07 8:21

Check out the SetConsoleCP and GetConsoleCP API functions.

Nothing is exactly what it seems but everything with seems can be unpicked.

Exiting process

koumodaki12-Sep-07 6:16

koumodaki

12-Sep-07 6:16

I have a application that does some computations based on inputs from user, prints the results of the calcutaions in a file and exits. I am using ExitProcess() for exiting from the application. But while closing the application I get a error "The instruction at "0x73e6827a" referenced at "0x00157479c". The memory could not be read" .

When I use TerminateProcess() I dont get the error message eventhough TerminateProcess() is not a recommeneded method for exiting process. Why does this happen?

Re: Exiting process

Hamid_RT12-Sep-07 6:44

Hamid_RT

12-Sep-07 6:44

What happens if you send WM_CLOSE to that program?

Re: Exiting process

Mark Salsbery12-Sep-07 6:45

Mark Salsbery

12-Sep-07 6:45

Is it a console app or a GUI app?

You shouldn't have to call ExitProcess and definitely shouldn't have to use TerminateProcess.

Some info: Terminating a Process[^]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Exiting process

aks.12-Sep-07 15:49

aks.

12-Sep-07 15:49

The difference b/w ExitProcess and TerminateProcess is ExitProcess will send DETACH message to all the loaded dll where TerminateProcess won't. So the error may occured on unloading some dll loaded by ur application.

AJay

problem with multithreading and wrapper-class object

kyer12-Sep-07 4:53

kyer

12-Sep-07 4:53

Hi guys,

I´m not sure I am using the corect terminology, since I´m pretty new to MFC programming. Sorry for that.

I created an object of a wrapper-class from an OCX libray (included with class _myObjectClass : public COleDispatchDriver).

As opposed to other classes in this library and what "OCX" suggests, this one is non-visual (no ActiveX).

I can use this object in a function just fine, except for when calling the function from a thread.

This works fine:

<br />
void TestDlg::DoIt()<br />
{<br />
   _myObject m_obj;<br />
<br />
   m_obj.CreateDispatch("xxxx.xxxx");<br />
 <br />
   m_obj.ObjMethod(xxx);<br />
}<br />
<br />
<br />
void TestDlg::OnButton()<br />
{<br />
   DoIt();<br />
}<br />

But this does not

<br />
static UINT MyThread(LPVOID p);<br />
<br />
UINT TestDlg::MyThread(LPVOID p)<br />
{<br />
   TestDlg * app=(TestDlg *) p;<br />
<br />
   app->DoIt();<br />
<br />
   return 0;<br />
}<br />
<br />
void TestDlg::DoIt()<br />
{<br />
   _myObject m_obj;<br />
<br />
   m_obj.CreateDispatch("xxxx.xxxx");<br />
 <br />
   m_obj.ObjMethod(xxx);<br />
}<br />
<br />
void TestDlg::OnButton()<br />
{<br />
   AfxBeginThread(MyThread, this);<br />
}<br />

Can anyone explain that behaviour or even suggest a solution?

Any advice or idea is greatly appreciated.

Thanks in advance,
..kyer

Re: problem with multithreading and wrapper-class object

Randor 12-Sep-07 4:59

Randor

12-Sep-07 4:59

Verwenden Sie bitte PostMessage() anstatt thread.

Try using PostMessage to send a message to your dialog rather than calling the public function from a thread. You should always try to avoid executing functions in a dialog from an external thread.

Best Wishes,
-Randor

Re: problem with multithreading and wrapper-class object

kyer12-Sep-07 5:30

kyer

12-Sep-07 5:30

Thanks a lot for your advice.

I implemented it and it works. But now my dialogue is blocked while the function is executed. It does not run as a second thread anymore, which is my goal.

Do you have any other suggestions?

Kind regards,
..kyer

Re: problem with multithreading and wrapper-class object

Randor 12-Sep-07 6:07

Randor

12-Sep-07 6:07

Why can't you just move all of the COM instantiation and function calls into the thread?

Also if you are accessing/writing to a variable visible to more than one thread, you will need to protect that variable with a critical section or other thread synchronization object. In other words, if variable N is readable/writable to both threads A and B then you will need to protect this variable. A simple CriticalSection object should be sufficient.

It is 1800 here in Norway/Norwegen and I am leaving the office for the day, but there are many articles here on Codeproject which address the issues with regards to multithreading your application and synchronizing access to variables.

Good luck!
-Randor

Re: problem with multithreading and wrapper-class object

kyer12-Sep-07 8:23

kyer

12-Sep-07 8:23

Randor,

many thanks for your help. I´ll try and see what I can learn about COM instantiation.

Kind regards,
..kyer

Solution

kyer12-Sep-07 9:12

kyer

12-Sep-07 9:12

Solution:

You have to call CoInitalize to initialize the library in the thread and UnInitialize to close it.

Like this:

<br />
void TestDlg::DoIt()<br />
{<br />
CoInitialize(NULL);<br />
<br />
_myObject m_obj;<br />
<br />
m_obj.CreateDispatch("xxxx.xxxx");<br />
<br />
m_obj.ObjMethod(xxx);<br />
<br />
CoUninitialize();<br />
}

excel problem

tunminhein12-Sep-07 4:28

tunminhein

12-Sep-07 4:28

Hello all,

Now I writing about TTS program. I already got the TTS function from the Microsoft word.
but Now I effort to write for MS Excel. The following is a piece of code of MSWord.
CMSWordSpy::CMSWordSpy()
: m_nStart(-1)
, m_nEnd(-1)
, m_bstrText(_T(""))
, m_pApp(NULL)
, m_pWindow(NULL)
, m_pRangeReplace(NULL)
, m_pRangeOrg(NULL)
, m_pScanRange(NULL)
, m_bWordIsRunning(false)
, m_hwnd(NULL)
, m_hwndRef(NULL)
{}

CMSWordSpy::~CMSWordSpy()
{}

void CMSWordSpy::dump_com_error(_com_error &e)
{
/*
_bstr_t bstrSource(e.Source());
_bstr_t bstrDescription(e.Description());

CString s;
s.Format(_T("code=%08lx, meaning=%s, Source=%s, Description = %s"),
e.Error(),
e.ErrorMessage(),
(LPCTSTR) bstrSource,
(LPCTSTR) bstrDescription);
LOG(s);
TRACE(s);
*/
}

void CMSWordSpy::Connect(BOOL bNewDoc, BOOL bMaximize)
{
if (m_bWordIsRunning)
return;

try
{
if (SUCCEEDED(m_pApp.GetActiveObject(L"Word.Application")))
{
TTS.Speak(_T("Key stone is connecting to Microsoft Word."),
_T("Windows"), LH_MODESENTENCE, -1, -1, TRUE);
if (bMaximize)
m_pApp->WindowState = wdWindowStateMaximize;
if (bNewDoc)
{
DocumentsPtr pDocs = m_pApp->Documents;
pDocs->Add();
}
m_bWordIsRunning = true;
}
}
catch (_com_error &e)
{
dump_com_error(e);
}
}

void CMSWordSpy::Disconnect()
{
if (m_bWordIsRunning)
{
try
{
TTS.Speak(_T("Key stone is disconnecting from Microsoft Word"),
_T("Windows"), LH_MODESENTENCE, -1, -1, TRUE);

// Setting smart pointers to NULL automatically
// handles any necessary release.
m_pWindow = NULL;
m_pRangeReplace = NULL;
m_pRangeOrg = NULL;
m_pScanRange = NULL;
m_pApp = NULL;
}
catch (_com_error &e)
{
dump_com_error(e);
}
}
m_bWordIsRunning = false;
}

but now i got the error in msword.tlh file. that's file is auto generate file.
<b>error is C2011 'enum redefinition'</b>

is anyone help me for that problem ?

Thanks,
tun

Re: excel problem

David Crow12-Sep-07 5:33

David Crow

12-Sep-07 5:33

tunminhein wrote:
error is C2011 'enum redefinition'

What does your code snippet have to do with this error? Confused | :confused:

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Projectsettings for dual core cpu's?

bosfan12-Sep-07 4:19

bosfan

12-Sep-07 4:19

Hello,
is there something what i have to change in my project settings if i want to
compile on dual core cpu, maybe in Linker options or something else??
Sorry, but i never work before with dual core! Frown | :(

Thank you in advance!
termal

Re: Projectsettings for dual core cpu's?

Randor 12-Sep-07 4:22

Randor

12-Sep-07 4:22

No, process scheduling is handled by the OS kernel. However your application should be designed with multiple threads to take full advantage of multiple processors.

Best Wishes,
-David delaune

Re: Projectsettings for dual core cpu's?

bosfan12-Sep-07 4:28

bosfan

12-Sep-07 4:28

Hello,
thank you for your quick answer! Beer | [beer]

regards
termal!

Re: Projectsettings for dual core cpu's?

carrivick12-Sep-07 21:50

carrivick

12-Sep-07 21:50

If you are using VS 2005 ensure that you have service pack 1 installed as this will generate code with better support for intel duo processors.

Re: Projectsettings for dual core cpu's?

bosfan12-Sep-07 21:55

bosfan

12-Sep-07 21:55

Hello,
no i use vs6 with sp6.

thanks
termal

template specialization

Russell^'12-Sep-07 3:51

Russell^'

12-Sep-07 3:51

template< typename A, typename B> class CMyClass{
...
}

I need to do template specialization only to set A=MyTypeName, so...what syntax is required?

something like this? (in the .cpp file?)

template<:confused::confused:,typename B>
CMyClass<MyTypeName,B>::foo(){..}

Russell

Re: template specialization

Nelek12-Sep-07 3:57

Nelek

12-Sep-07 3:57

Doesn't work as when adding default values to parameters in a function definition?

I mean something like:

template < typename A /*= MyTypeName*/, typename B >

or something like that.

Greetings.

--------
M.D.V.

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?

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