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03.04.2008 at 12:43PM PST, ID: 23213986

	[x] Attachment Details

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9.2

Need a clarification about a book example, "Windows Sockets Network Programming" by Bob Quinn and Dave Shute

Zones: File Transfer Protocol (FTP), Microsoft Visual C++, WInsock

Tags: C

In chapter's 7 example AC_FTP client WSA_ASYNC message handler, I can't figure out
how the iNextRply variable is used to handle partial reads of ftp replies as the author
have indicated in the book.

Questions:
1- Does anyone know if this code have been updated by the author. I checked the site
http://www.sockets.com but I cannot download the sample application from the ftp
server, it always errors out.
2- If the code is correct can you please explain how the iNextRply is being used.

         
           
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             switch (WSAEvent) {
          case FD_READ:
             if (!iNextRply) {
                /* Receive reply from server */
                iLastRply = RecvFtpRply(hCtrlSock, szFtpRply, 
                                        RPLY_SIZE);
             }
            if (iLastRply && (iLastRply != SOCKET_ERROR)) {
                /* Display the reply Message */
                GetDlgItemText (hWinMain, IDC_REPLY, achRplyBuf, 
                  RPLY_SIZE-strlen(szFtpRply));
                wsprintf (achTempBuf, "%s%s", szFtpRply, achRplyBuf);
                SetDlgItemText (hWinMain, IDC_REPLY, achTempBuf);
 
   	       /* Save index to next reply (if there is one) */
                nRet = strlen(szFtpRply);
                if (iLastRply > nRet+2) {
                  iNextRply = nRet+3;
                  /* Adjust if reply only had LF (no CR) */
                  if (szFtpRply[nRet+2])
                    iNextRply = nRet+2;
                }
             }
 
            /* Figure out what to do with reply based on last command */
            ProcessFtpRply (szFtpRply, RPLY_SIZE);
            break;
           
         

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Question Stats

Zone: Networking

Question Asked By: Learner001

Solution Provided By: DanRollins

Participating Experts: 1

Solution Grade: A

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03.05.2008 at 10:02AM PST, ID: 21052741

Vee_Mod:

Learner001

A message has been sent to some of our more experienced Experts asking them to review your question.

I will check back again tomorrow to see if you are getting the help you need.
In the future, you can click on the "Report Abuse" hyperlink in the body of your question (lower right corner) to generate a "Request for Attention" from one of the Moderators.

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Link to CS-G post:
http://www.experts-exchange.com/Q_23215313.html

03.08.2008 at 02:45PM PST, ID: 21078993

Rank: Master

DanRollins:

I tried to download the example app, but it requires a login and password.

We cannot know anything about what is happening there, given just that snippett of code.

03.09.2008 at 01:37PM PDT, ID: 21082619

Learner001:

Thanks DanRollins for attempting the download from that site, I couldn't either. I was hoping
to get an updated version of the program that came with the book in case the floppys example is missing additional code.

I am attaching the files of the example that came with the book, hope you can have a look at it. When I was compiling the program I searched for other references for the iNextRply variable and could not see any other except in the piece of code I posted earlier.

Regards

ABOUT.C.txt (3 KB) (File Type Details)

example code

AC-FTP.C.txt (26 KB) (File Type Details)

example code

AC-FTP.H.txt (5 KB) (File Type Details)

example code

CLOSECON.C.txt (3 KB) (File Type Details)

example code

FILE-DIR.C.txt (5 KB) (File Type Details)

example code

FILE-DIR.C.txt (5 KB) (File Type Details)

example code

FTP-CTRL.C.txt (13 KB) (File Type Details)

example code

FTP-DATA.C.txt (12 KB) (File Type Details)

example code

GLOBALS.C.txt (1 KB) (File Type Details)

example code

RESOURCE.H.txt (1 KB) (File Type Details)

example code

WIN-MGR.C.txt (2 KB) (File Type Details)

example code

WSA-ADDR.C.txt (4 KB) (File Type Details)

example code

WSA-ERR.C.txt (2 KB) (File Type Details)

example code

WSA-OPTN.C.txt (2 KB) (File Type Details)

example code

03.09.2008 at 04:25PM PDT, ID: 21083145

Rank: Master

DanRollins:

It appears that that is the only place iNextReply is used.

iNextReply is the location (offset) into the reply string that is one byte after the last byte that has been processed. Thus, it is the position to continue processing.

I'm not particularly impressed with the code. It uses global variables (such as iNextReply) and does not initialize them.

Accepted Solution

03.11.2008 at 02:31AM PDT, ID: 21094108

Learner001:

Wanted someone to confirm that for me. Thank You.

20080236-EE-VQP-29 / EE_QW_2_20070628