C / C++ / MFC Discussion Boards

xtsea29-Jun-00 4:25

29-Jun-00 4:25

Is this possible to do using MFC classes?

Either way, where can I find information about this (preferably with source examples...)?

/XTSea

How to check a socket is disconnected

Stefan29-Jun-00 3:23

Stefan

29-Jun-00 3:23

I use raw Windows sockets.
How to check whether the other side of the connection is closed?

Thanks

Re: How to check a socket is disconnected

Yaron29-Jun-00 3:43

Yaron

29-Jun-00 3:43

hi,

i really need help in windows sockets, here is a function i wrote to connect to server:

//----------- Function Implementation --------------------------------
bool ConnectToSocket()
{
if (WSAVERNOTSUPPORTED == WSAStartup(MAKEWORD(2,0),&WSAData))
{
printf("WSAStartup Failed!\r\n");
return FALSE;
}//end if
else
{
printf("WSAStartup Success\r\n");
}//end else

// construct socket
sock = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if (sock == INVALID_SOCKET)
{
printf("Failed to construct socket!\r\n");
WSACleanup();
return FALSE;
}//end if
else
{
printf("Socket construction....Success\r\n");
}//end else

// fill in socket address struct and connect to server
sa.sin_family = AF_INET;
sa.sin_port = 23;
sa.sin_addr.S_un.S_addr = inet_addr("147.234.12.233");

int iErr = connect( sock,(SOCKADDR *)&sa,sizeof(sa));

return TRUE;
}

it doesn't seem to work ,i dont know why..... also how do i receive and send data????

please help me i am desperate!

tnx a lot
yaron

Re: How to check a socket is disconnected

RamiBuchnik29-Jun-00 4:31

RamiBuchnik

29-Jun-00 4:31

there are some possebilities
the first 1 is that the server is not up
you don't check errors at all
in the winsock.h there are list of errors
you can take the error value
(which is unsigned int)and send
it to acheckerror function
which does switch case over all the possebilities
and then know more specific what is
the problem
any way good luck
Rami Buchnik

Debug Assertion Failed ?

kasjhdfkjhfj29-Jun-00 3:12

kasjhdfkjhfj

29-Jun-00 3:12

I'm new to VC++
I'm working on a project that I took over from someone else.
It a stats program that reads data from a database and uses OleChart
to output a chart, well anyway when the program starts in debug
I get an Assertion failed message, Message is about strcore.cpp on line
519 and on line 479 what I have been doing is ignoring them and the
program loads fine but when I'm running the program and I click on
any of the combo boxs or radio buttons I get another assertion message
about winocc.cpp line 311. Now I don't expect you all to tell me what is worng
but if anyone else has seen this please respond.

BTW the program does work in debug but crashes in the release version ?

Re: Debug Assertion Failed ?

Christoph Rupp29-Jun-00 11:03

Christoph Rupp

29-Jun-00 11:03

About the strcore.cpp-assertion: if you click on "retry" the debugger-ide jumps to this assertion.
In your debug window you can now switch through the contexts of the caller function; this way you
can find your source which is responsible for this assertion. Maybe you're trying to access a CString-buffer
which is empty or something like that.

About the winocc.cpp: just do it the same way. Run with F5, wait for the crash and check the caller
functions.

About the debug/release thingy: THIS is something really nasty and you will need a lot of luck to
catch such bugs. Sorry Smile | :)

Chris

Re: Debug Assertion Failed ? Thanks Chris

kasjhdfkjhfj30-Jun-00 3:41

kasjhdfkjhfj

30-Jun-00 3:41

I found the bugs in the release version
and I'm going to try what you said for the debug version.
But most of all thanks for replying.

cmpssp

Message handler

Bjorn29-Jun-00 1:44

Bjorn

29-Jun-00 1:44

Hi How can I add an message handler for a item I added dynamically in an application's menu. Please help

Re: Message handler

Mike Dunn29-Jun-00 7:33

Mike Dunn

29-Jun-00 7:33

Use the ON_COMMAND macro in the message map, like:

ON_COMMAND(IDC_NEW_MENU_ITEM, OnNewMenuItem)

And the function prototype is:

afx_msg void OnNewMenuItem();

FTP's LIST command's reply format

Trieu Nguyen29-Jun-00 1:06

Trieu Nguyen

29-Jun-00 1:06

Hi,
I'm writting a FTP Client, using CSocket. And i have problem with the reply format of LIST command.
I tried on some different kinds of FTP server (UNIX, WINDOWS, DOS model), and saw it not the same. Tried to guess the format, but failed.
Who can help me out of this? every suggestion would be appreciated.
Trieu Hai Nguyen
haitrieu@glassegg.com

Re: FTP's LIST command's reply format

Jeff Naber21-Jul-00 13:18

Jeff Naber

21-Jul-00 13:18

Hi,

I too have tried deciphering the result of the LIST command for an FTP client. I even downloaded the latest FTP standard, and guess what, the response to the LIST command is not standard.

My current thought is just to write the data (whatever they send) to a log file that the end user can view. Then the end user can determine if the 'SEND' was successful or not.

If anyone else has a better answer, I'm all ears...

Jeff

How to add horizontal scrollbar to dropdown list

Chris Vischer29-Jun-00 0:09

Chris Vischer

29-Jun-00 0:09

Hi,
how can i add a horizontal scrollbar to the dropdown list of my combobox ?
SetHorizontalExtend() won't do anything, although i have added the style WS_HSCROLL.

Any idea?
TIA Chris

Re: How to add horizontal scrollbar to dropdown list

Paolo Messina30-Jun-00 13:43

Paolo Messina

30-Jun-00 13:43

Hi Chris,

I think SetHorizontalExtent() works only with a combobox in edit+listbox mode, not a drop-down combo.

The problem is that a combobox is actually two controls together and you should set the WS_HSCROLL style of the listbox inside the combobox, which is not simple.

I can't help you more than this, sorry Frown | :(

Cheers,
Paolo.

Setup Q: How to install a DSN

Matthias29-Jun-00 0:08

Matthias

29-Jun-00 0:08

Hello,

I've got a question regarding setup. I need to create a setup for my application and the application is using a SQL server to log some data. How do I install support for the SQL server (if required) and the DSN?

I would appreceate any tips or links to some documentation.

Matthias

Re: Setup Q: How to install a DSN

Yaron29-Jun-00 3:45

Yaron

29-Jun-00 3:45

hi,

see in the registery how the DSN is registered and in your install application, add the registery entries to your install application.......

hope this helps ya,

yaron

CFileDialog

Tenacious28-Jun-00 22:47

Tenacious

28-Jun-00 22:47

Now i want to open dialog for open many files , so i
'm programming that
char filter[] = "Contact Outlook(*.contact)|*.contact||";
CFileDialog fd(TRUE,NULL,NULL,OFN_ALLOWMULTISELECT | OFN_HIDEREADONLY,filter);
After that i will get name of file that i select by coding
if(fd.DoModal() == IDOK){
POSITION p;
p = fd.GetStartPosition();
CString path;
do{
path = fd.GetNextPathName(p);
}while (path != "");
}
But it is error on run time , this program will pop up error-dialog when the program
do line => "path = fd.GetNextPathName(p);"
I think because when fd.GetNextPathName(p) got name of file finished and when it got agin
it does not return NULL but it can't call "fd.GetNextPathName(p)"

I worry about thing very much , Please help me .
Thank you for your help

Re: CFileDialog

cmulcay28-Jun-00 23:18

cmulcay

28-Jun-00 23:18

I think that the problem comes from your use of the POSITION variable. You should use it like this:

POSITION p = fd.GetStartPosition();
CString path;
while(p){
path = fd.GetNextPathName(p);
...
}

It works like a CObList, for example...

HTH.

K.

how to set the font used for button/label

mactan28-Jun-00 22:28

mactan

28-Jun-00 22:28

Hi,
I want to set to the font and fontsize for my button and label without MFC. Can anyone pls tell me how to do it

Re: how to set the font used for button/label

Mike Dunn29-Jun-00 0:38

Mike Dunn

29-Jun-00 0:38

Here's an example that makes the font bold. This is untested, and it's 3:25 AM, so please test before checking the code in. Wink | ;)

HFONT hCurrFont, hNewFont;
LOGFONT lf;

// 1. Get the button's current font.
hCurrFont = (HFONT) SendDlgItemMessage ( hMyDlg, IDC_MY_BUTTON, WM_GETFONT, 0, 0 );
GetObject ( hCurrFont, sizeof(LOGFONT), &lf );

// 2. Change the font however you want by tweaking the LOGFONT members.
lf.lfWeight = FW_BOLD;

// 3. Create a new font.  Note that in "real" code, you should save this HFONT somewhere and delete the font when the dialog closes.
hNewFont = CreateFontIndirect ( &lf );

// 4. Make the button use this new font.
SendDlgItemMessage ( hMyDlg, IDC_MY_BUTTON, WM_SETFONT, (WPARAM) hNewFont, TRUE );

how to set the font used for button/label

mactan28-Jun-00 22:28

mactan

28-Jun-00 22:28

Hi,
I want to set to the font and fontsize for my button and label without MFC. Can anyone pls tell me how to do it

Windows Firewalls

FunkBoy28-Jun-00 21:20

FunkBoy

28-Jun-00 21:20

I've noticed the question asked around a lot
but no one seems to answer it, but I'll ask here

There are many packet sniffer and Firewalls for windows, but no free source ones to look at to see how it works
Does anyone have any idea, or tips they would like to share on how one would go by developing one

Thanks for any replies

How to read cpu temperature?

Farzad B.28-Jun-00 20:41

Farzad B.

28-Jun-00 20:41

Can anyone give me a general idea how I can programatically read various physical numbers from the motherboards Winbond chip. Thinks like cpu temp. or mobo temp.? Or perhaps someone knows where I can get this info.

Thanks.

When a DLL unload from physical memory??

Ryan Park2-Jul-00 23:56

Ryan Park

2-Jul-00 23:56

HI,

I wonder when a DLL unloads from PHYSICAL memory...

I found that each process which attach a DLL has a

referrence count for use of it..

And when the count becomes zero it is detached from

process and removed from process's VIRTUAL memory

address..

THEN,.....When exactly a loaded DLL unloads?

(I mean when = which state that satisfies its

unloading condition)

Does it unload itself?
OR
Windows OS unloads it?

Thanks in advance..

-Ray

Re: When a DLL unload from physical memory??

Pere Mitjavila15-Jul-00 0:50

Pere Mitjavila

15-Jul-00 0:50

I think a DLL unloads from physical memory when this memory it's needed. As when Windows loads a DLL, it only reserves the virtual memory and maps it to the DLL. If the DLL was not loaded, when the process access it, it causes a page fault, and automatically Windows loads it into physical memory. I suppose the it's the same process when unloading: removing the DLL from memory if RAM it's not needed is a silly task, as maybe Windows must reload the DLL after removing it. I suppose the RAM pages containing the DLL will be marked as they can be used, but if anybody uses this pages, 'reloading' the DLL into physical memory will be a little effort. If I find more information I'll post another message, or if anybody can assure this or correct me, will be pleased!!! Smile | :)

_AfxGetComCtlVersion

28-Jun-00 9:19

Hi all,

I found following snippet in \vc98\mfc\src\afximpl.h, which looks very interesting:

// for determining version of COMCTL32.DLL
#define VERSION_WIN4    MAKELONG(0, 4)
#define VERSION_IE3     MAKELONG(70, 4)
#define VERSION_IE4     MAKELONG(71, 4)
#define VERSION_IE401   MAKELONG(72, 4)
extern int _afxComCtlVersion;
DWORD AFXAPI _AfxGetComCtlVersion();

No more determing COMCTL's file version? Instead simply call:

if (_AfxGetComCtlVersion() >= VERSION_IE3)
{
    //...
}

Or do I misaccept something? Can anybody comment on this?

Thanks in advance,
Thömmi

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