C / C++ / MFC

Re: MFC dll acting strange when using &Data in exported f() parameters

4-Mar-02 3:33

Hi,
Dont use CString, use LPTSTR,
MFC uses some state information on a per-module
basis, and is very sensitive to module and
thread switches,
BTW did u include the AFX_MANAGE_STATE in
the exported function. ?

Tomasz Sowinski4-Mar-02 3:41

someone who knows about blocking a packet at network layer using vc++

4-Mar-02 3:41

You can pass CStrings around if and only if you're using the same heap in .exe and .dll. Go to the project settings, then selectd 'C++' tab and 'Code Generation' category. You should ensure that both .exe and .dll use .dll runtime library.

Tomasz Sowinski -- http://www.shooltz.com

4-Mar-02 3:15

helo!
i am going to write an statefulll packet filtering firewall , can i block packet at very low level to stop DOS (Dannial Of services) attack on my server, is winsock support this feature, if winsock does not allow this feature then can i write a driver using DDK for doing this thing , kindly guide me for doing this thing .

a bundel of thanx

Manually opening a document

benjymous4-Mar-02 3:02

benjymous

4-Mar-02 3:02

I have a document/view app which has drag/drop support to open files.

Currently the OnDropFiles() method calls the document's OnOpenDocument(), but this seems to have a few side effects

1) The document's title doesn't get updated
2) The view's OnInitialUpdate() doesn't get called, meaning my view doesn't realise the document has changed

What am I doing wrong?

Thanks,

Richard

--
Help me! I'm turning into a grapefruit!

Re: Manually opening a document

Prem Kumar4-Mar-02 3:26

4-Mar-02 3:26

You might consider calling

InitialUpdateFrame(pFrame, pDocument, bMakeVisible);

which will actually refresh the view and update the title.
Hope it works.

CDateTimeCtrl and CTime

User 66584-Mar-02 2:59

User 6658

4-Mar-02 2:59

In my dialog I have two Date/Time-Picker-controls...one to select a date and another to select a time. I also have two variables, named

CDateTimeCtrl	m_ctlTime;
CDateTimeCtrl	m_ctlDate;

What's the easiest way to read their values (date and time) into one single CTime variable?

thanks in advance

modified 12-Sep-18 21:01pm.

Prem Kumar4-Mar-02 3:11

4-Mar-02 3:11

Use the overloaded construter
CTime( int nYear, int nMonth, int nDay, int nHour, int nMin, int nSec, int nDST = -1 );

Tomasz Sowinski4-Mar-02 3:26

4-Mar-02 3:26

Try this...

SYSTEMTIME st;
m_ctlDate.GetTime(&st);
m_ctlTime.GetTime(&st);
CTime time = st;

Tomasz Sowinski -- http://www.shooltz.com

Prem Kumar4-Mar-02 3:28

4-Mar-02 3:28

Using this approach the second call to 'GetTime' refill the time value
effectively erasing the previous value obtained from m_ctlDate.

Tomasz Sowinski4-Mar-02 3:30

4-Mar-02 3:30

Sorry - previous message contains invalid answer. This should work OK:

SYSTEMTIME stDate, stTime;
m_ctlDate.GetTime(&stDate);
m_ctlTime.GetTime(&stTime);
stDate.wHour = stTime.wHour;
stDate.wMinute = stTime.wMinute;
stDate.wSecond = stTime.wSecond;
CTime time = stDate;

Tomasz Sowinski -- http://www.shooltz.com

Re: socket backlog problem

User 66584-Mar-02 3:43

User 6658

4-Mar-02 3:43

Thanks guys! Smile | :)

What about using Prem's approach?
Instead of CDateTimeCtrl I made the varables CTime with names m_timeTime and m_timeDate

Thus I used this code:

UpdateData();
	
CTime Time(m_timeDate.GetYear(), m_timeDate.GetMonth(), m_timeDate.GetDay(), m_timeTime.GetHour(), m_timeTime.GetMinute(), m_timeTime.GetSecond());

Seems to be quite easy as well

modified 12-Sep-18 21:01pm.

socket backlog problem

4-Mar-02 2:02

For large no. of clients connect to server during the load test,getting the connection refused error,even if at server side the backlog in listen() method of the socket is put to maximum SOMAXCONN and creating the user thread for each user after accept.

How to solve this prob.

Tim Smith4-Mar-02 2:14

Tim Smith

4-Mar-02 2:14

How many do you want it to keep in a backlog? Using SOMAXCONN justs tells the service provider to pick a reasonable value. This value could differ between service providers.

So basically, you can't flood your server with connection questions and expect them all to be placed on the backlog. That would actually be a bad design since you could in theory DOS the server by exhausting its memory with a huge backlog of connection requests.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Re: socket backlog problem

Joaquín M López Muñoz4-Mar-02 2:17

Joaquín M López Muñoz

4-Mar-02 2:17

You gain nothing by calling listen each time after accepting. The standard sequence is: listen once and then loop around accept.
Is you're having connections refused, try to speed up your accept-associated code. Your maximum rate of clients served per second is 1/t, where t is the time it takes to your app to accept a client. No backlog will improve that appart from providing some resiliance against temporary rushes. In Winsock 1.1 the maximum backlog is 5 (admittedly a little low), if you're using Winsock 2 you can set a more comfortable backlog size (though the value of SOMAXCONN for Winsock 2 is an overkill (0x7FFFFFFF), and you're better off setting something smaller than that.)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Copy system registry files in win 2k

4-Mar-02 1:35

How I can copy system registry files in win 2k? (winnt\system32\config\*.*) IMHO... it's posible only under DOS... What is your opinion? Sanks...

Viewing flash files

Jon Newman4-Mar-02 1:14

Jon Newman

4-Mar-02 1:14

I was wondering how to create an SDI app thats view is one of a Shockwave Flash movie viewer. For example the flash viewer/projector app. I know that you can include it as an ActiveX control in a dialog but how would it work for a doc/view app.
Any examples/tutorials would be greatly appreciated.

.NET or not .NET? MFC is the question......

Re: Viewing flash files

benjymous4-Mar-02 2:57

benjymous

4-Mar-02 2:57

You could use a CHtmlView and make it load the .swf file

--
Help me! I'm turning into a grapefruit!

FindFirstFile & FindNextFile

Mauricio Ritter4-Mar-02 1:08

Mauricio Ritter

4-Mar-02 1:08

Does anyone know if there is a way to return the files from the functions FindFirstFile and FindNextFile sorted by name !?

Mauricio Ritter - Brazil
Sonorking now: 100.13560 Trank

Re: FindFirstFile & FindNextFile

Tomasz Sowinski4-Mar-02 1:28

Re: FindFirstFile & FindNextFile

4-Mar-02 1:28

AFAIK, it's not possible. You'll have to sort yourself - just store the names in std::vector and call std::sort.

Tomasz Sowinski -- http://www.shooltz.com

Mauricio Ritter4-Mar-02 1:42

Mauricio Ritter

4-Mar-02 1:42

Tomasz Sowinski wrote:
You'll have to sort yourself - just store the names in std::vector and call std::sort.

Just what I expected Frown | :(

Tks Tomasz !

Mauricio Ritter - Brazil
Sonorking now: 100.13560 Trank

Container window for DLLs

4-Mar-02 0:55

Hi !

I have a SDI application which has the view derived from CFormView (the resource for this view is IDD_CONTAINER).
I have to create some DLLs which will be loaded dynamically at runtime by the SDI application (at some stage only a DLL is loaded).
These DLLs will use the CFormView's resource (IDD_CONTAINER), the view window is actually a container window for those DLLs.
The DLLs are MFC Extension DLL (using shared MFC DLL).

Could anyone explain me how to do that (eventually some examples)?

Many thanks,
Vasile

Re: Container window for DLLs

Tomasz Sowinski4-Mar-02 1:24