C / C++ / MFC

OnInitDialog() direct call

27-Dec-02 22:15

What exactly does this mean and how would I add this functionality to my own controls?

For instance i have a Listview control and I would like to bind a database to it, would I basically just add a function called Bind() with parameters required to query database and have this function fill in the fields on the list control?

"Two wrongs don't make a right, but three lefts do!" - Alex Barylski Smile | :)

Hockey27-Dec-02 21:59

Hockey

27-Dec-02 21:59

Is this safe to do???

I have Add and Delete buttons which operate on a database and fill combobxes accordingly. The comboboxes are all filled with data inside OnInitDialog() so instead of rewritting code to populate the combo's on each and and remove I simply flush all combobox content and recall OnInitDialog() directly. I suppose I could have wrote functions like FillContactsCombo() and call them inside OnInitDialog and Add/Remove buttons, but I didn't so I would like to know if calling OnInitDialog is safe???

Thanks for your input Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Michael P Butler27-Dec-02 22:25

Michael P Butler

27-Dec-02 22:25

It would only take a couple of minutes to cut and paste your code from OnInitDialog into a FillContactsCombo function. Having a seperate function is the correct way to code this.

A quick look through the base level CDialog::OnInitDialog shows a code that loads and locks resources as well as sending off other WM_x to the dialog controls. I'd say it isn't safe to do it and also a very poor and lazy programming style.

Michael

Fat bottomed girls
You make the rockin' world go round -- Queen

alex.barylski28-Dec-02 0:07

28-Dec-02 0:07

Michael P Butler wrote:
lazy programming style.

Yup, but it's just an app i'm building for myself and I use the waterfall (i think??) approach to designing apps. I don't really create much of a design doc (cuz well I don't know what one looks like to be honest) I just kind of start building...take away what i've learned and rebuild correcting and optimizing as I go...over and over again

Thanks Smile | :)

"Two wrongs don't make a right, but three lefts do!" - Alex Barylski Smile | :)

Michael P Butler28-Dec-02 1:02

Michael P Butler

28-Dec-02 1:02

I've been programming for a long time, it is now second nature for me to write my code in small functions rather than putting everything into one function. I very often don't have a design document but you soon learn to get into the habit of writing structured code - if only to make your own life easier.

Michael

Fat bottomed girls
You make the rockin' world go round -- Queen

Brian Delahunty28-Dec-02 1:19

Brian Delahunty

28-Dec-02 1:19

I'd move the code to seperate functions to be on the safe side. I don't think it would be safe to constantly call OnInitDialog.

Regards,
Brian Dela Smile | :)

alex.barylski28-Dec-02 15:19

Resizing of CFormView based window

28-Dec-02 15:19

I was going to, but when I tried it with calling OnInitDialog() it worked so I left it, but then thought i'd get some opinions on CP.

Cheers!

"Two wrongs don't make a right, but three lefts do!" - Alex Barylski Smile | :)

M.Shoaib Khan27-Dec-02 21:03

M.Shoaib Khan

27-Dec-02 21:03

when i resize my CFormVIew based window my controls donot resize accrodinfg to it.. how can i resize my controls placed on the dialog attached to CFormView when i maximize the window???

Shoaib Khan
sbk_one@yahoo.com

Re: Resizing of CFormView based window

alex.barylski27-Dec-02 22:01

URG:: CloseSocket() error with Multithreading.

27-Dec-02 22:01

WM_SIZE I would think should work.

I would just resize/reposition each control inside OnSize()

Cheers!

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

FTP question

focusphs27-Dec-02 19:09

focusphs

27-Dec-02 19:09

I am Korean.
I English not very well.
please!
I don't know how to do FTP file status find a way. ^.^

Smile | :)

Re: FTP question

User 665828-Dec-02 1:55

User 6658

28-Dec-02 1:55

I don't know what you mean, but did you take a look at this?

regards
Greg

modified 12-Sep-18 21:01pm.

ydasari27-Dec-02 15:24

ydasari

27-Dec-02 15:24

Hi All

I appreciate greatly a quick response. Thank you.

I am using unicast sockets (sync) where i bind the socket in one thread and keep accept() new calls in another thread. and Closesocket() in another.

When I closesocket(), the program terminates. and if i remove closesocket(), it does not allow me to bind() again.

I forgot to mention that I need to close and connect again without terminating the application (reuse the socket). Is there any way to do this or what am i doing wrong?

int UnicastConnect()
{
printf("Establishing the listener...");
WORD version = MAKEWORD(1,1);
WSADATA wsaData;

WSAStartup(version, &wsaData);

// Next, create the socket itself
listeningSocket = socket(AF_INET, SOCK_STREAM,IPPROTO_TCP);

if (listeningSocket == INVALID_SOCKET) {
AfxMessageBox("Error at socket()");
WSACleanup();
return 0;
}

// Use SOCKADDR_IN to fill in address information
SOCKADDR_IN saServer;

saServer.sin_family = AF_INET;
saServer.sin_addr.s_addr = INADDR_ANY; saServer.sin_port = htons(g_InetPort);

/*
setsockopt( listeningSocket, SOL_SOCKET, SO_REUSEADDR, NULL, NULL );
*/

// Bind the socket to our local server address
nRet = bind(listeningSocket, (LPSOCKADDR)&saServer, sizeof(struct sockaddr));
if (nRet == SOCKET_ERROR) {
AfxMessageBox("Error Binding Socket");
WSACleanup();
return 0;
}

// Make the socket listen
nRet = listen(listeningSocket, MAX_CLIENTS);
if (nRet == SOCKET_ERROR) {
WSACleanup();
return 0;
}

if (listeningSocket == INVALID_SOCKET) {
return false;
}

CreateThread(0, 0, AcceptConnections, (void *)
listeningSocket, 0, NULL);

}

DWORD WINAPI AcceptConnections(void *ListeningSocket)
{
sockaddr_in sinRemote;
int nAddrSize = sizeof(sinRemote);

while (1) {
SOCKET sd = accept((SOCKET) ListeningSocket, (sockaddr*)&sinRemote,&nAddrSize);

*p = 1 ;
ioctlsocket(sd, FIONBIO, p); // Sets the Non-Blocking Mode of Socket.

if (sd != INVALID_SOCKET) {
AfxMessageBox ("BeaconSender::Accepted Unicast connection from ");
}
else {
AfxMessageBox ("Closed");
return false;
}
}
}

void stop(){
shutdownsocket(listeningsocket)
closesocket(listeningsocket); //Gives an error
wsacleanup();
}

Thanks for your help.
Yogi

Re: URG:: CloseSocket() error with Multithreading.

valikac27-Dec-02 16:07

Re: URG:: CloseSocket() error with Multithreading.

27-Dec-02 16:07

Consider WSASocket().

listeningsocket = ::WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, 0);
::closesocket(listeningsocket);

Kuphryn

Anonymous28-Dec-02 4:56

Anonymous

28-Dec-02 4:56

Thanks for the suggestion.

I forgot to mention that all the code is built inside an ActiveX. Does that cause a problem??

CloseSocket() was terminating the application. Then if i remove the closesocket(), the binding to the IP/Port does not occur (obviously).

WSASocket() is showing as undeclared identifier with ws2_32.lib included.

Best Regards
Yogi

CreateFile and Long Path/Files :: Win32

valikac27-Dec-02 14:35

27-Dec-02 14:35

Hi.

Is it possible to create a file with a long path name? For example:

-----
std::string pathFile("c:\testing\December 27\newfile.type");

// CreateFile fails
if (::CreateFile(pathFile->c_str(),...) == INVALID_HANDLE_VALUE)
{
}
-----

I would like to know two properties of CreateFile(). First, is it possible to create a file in a directory that does not exist via CreateFile()? In the example above, directories "testing" and "December 27" do not exist.

Secondly, is it possible to create directories with spaces between one or more words, i.e. December 27. Notice the space before "2."

Thanks,
Kuphryn

Todd Smith27-Dec-02 14:50

Todd Smith

27-Dec-02 14:50

1. CreateFile will NOT create directories. You'll need a recursive create directory function. There are a few hanging around CP. And I have you if you need it.

2. Yes. Spaces are fine.

CreateDirectory("December 27");

should work

Todd Smith

Michael Dunn27-Dec-02 14:50

Michael Dunn

27-Dec-02 14:50

kuphryn wrote:
is it possible to create a file in a directory that does not exist

No, if the dir doesn't exist there's no place to create the file.

Secondly, is it possible to create directories with spaces between one or more words

Yes, CreateFile() uses whatever string you pass it for the name.

--Mike--
If it doesn't move and it should: WD-40. If it moves and it shouldn't: duct tape.

1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
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valikac27-Dec-02 14:58

27-Dec-02 14:58

Okay. Thanks everyone.

Is there a Win32 API for checking the existence of a directory? Otherwise, recursive creation will do.

One last inquiry. I have seen in the past members mentioning directories with two backslashes. Is there something special about creating directories with two backslashes instead of one?

Example:
std::string pathFile("c:\\testing\\December 27\\file.type");

Kuphryn

carpediem27-Dec-02 16:56

carpediem

27-Dec-02 16:56

kuphryn wrote:
Is there a Win32 API for checking the existence of a directory? Otherwise, recursive creation will do.

Technically, no. At least I haven't seen one. In an instance that I had, I had to create a file, several dirs deep. So I had to do a _access(filename, 00) to see if the dir existed. If not, I would create it. That might be how you will have to do it.

kuphryn wrote:
I have seen in the past members mentioning directories with two backslashes. Is there something special about creating directories with two backslashes instead of one?

I am not sure about this. In some cases, if you are required to use \\ in order to have just one \. In other cases, it doesn't matter. For instance in your case, I think it will work to have just one c:\ instead of c:\. I know in other cases, for instance, in a wsprintf, strcpy, you have to have \\.

valikac27-Dec-02 17:27

27-Dec-02 17:27

Okay. Thanks.

Kuphryn

Michael Dunn27-Dec-02 19:26

Michael Dunn

27-Dec-02 19:26

kuphryn wrote:
Is there something special about creating directories with two backslashes instead of one?

The two backslashes are necessary to comply with C++ syntax. In string and character literals, a backslash is a special character and indicates that the next character should be treated specially. For instance, \t means "the tab character". One backslash by itself is meaningless*, so in order to have a backslash character in a string, you write \\ in your code.
So to create a directory C:\testing, you write "C:\\testing". If you write "C:\testing", that is interpreted as C followed by colon followed by TAB followed by "esting", which is not what is intended.

*Except when the backslash comes at the end of a line, in which case it is an instruction to the preprocessor to join the line with the following one.

--Mike--
If it doesn't move and it should: WD-40. If it moves and it shouldn't: duct tape.

1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

valikac27-Dec-02 20:47