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The Barcode SDK can detect, read , and write 1D and 2D barcodes in images. It is also integrated with the library's HTML5/JavaScript Document library which you can use in your ASP . NET project. The code to recognize barcodes in a document looks like this: function barcodesExample() {

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Beware of a classic rookie mistake with TCP sockets. Developers often observe that if they write, say, 20 bytes into a socket, and then on the receiving end they perform a read operation that asks for more bytes (e.g., 1,000), that read usually returns 20 bytes rather than waiting for the requested number of bytes to arrive. Many people mistakenly assume this means TCP guarantees that data will arrive in chunks of the same size in which it was sent. In practice, if a client sends a 20-byte chunk of data, the receiving end may well return six bytes of that chunk from the first read, then another 13 in the next, and then the last byte in the next read. Or even better, it might decide to aggregate that final byte onto the front of the next lump of data sent by the client. TCP sockets only attempt to deliver all the bytes in the order in which they were originally sent. Your code cannot make any assumptions about the granularity in which the socket will return incoming data. TCP has no idea of a message or a frame it offers just a linear sequence of bytes. Your code needs to be ready to cope with data coming out of the socket in arbitrarily sized lumps. (Asking the socket for data one byte at a time is a way of simplifying this, although for high-bandwidth communications that might not be the most efficient solution you may get better throughput if you let the socket give you data in slightly larger chunks.)

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Notice that the first line of Example 13-23 passes true as a second argument to the NetworkStream constructor. This tells the NetworkStream that we d like it to take ownership of the Socket object once we are done with the NetworkStream and call Dispose on it, it will shut down the Socket object for us. That ll happen at the end of the block for the using statement here. This is important: we must close connections when we have finished with them, because otherwise, we could end up hogging resources on the server unnecessarily. Having fetched the data and closed the socket, we finally print out the data:

Console.WriteLine(data);

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The smbldap_bind.conf file contains options that specify credential information that the smbldap-tools will use when connecting to the assigned LDAP servers. This file is also located in the /etc/smbldaptools directory. It holds the distinguished names and binding passwords for both master and slave

IPHostEntry hostDnsEntry = Dns.GetHostEntry("time-nw.nist.gov"); IPAddress serverIp = hostDnsEntry.AddressList[0]; Socket daytimeSocket = new Socket( serverIp.AddressFamily, SocketType.Stream, ProtocolType.Tcp); daytimeSocket.Connect(serverIp, 13); string data; using (Stream timeServiceStream = new NetworkStream(daytimeSocket, true)) using (StreamReader timeServiceReader = new StreamReader(timeServiceStream)) {

Figure 2-15. Completed connection properties Now the connection string has been established. Click the Save button to save the project properties and close the project properties. Next, view the code for the workflow and add a new sub called SQLInsertUpdate. This sub will do the work to insert the record and update the purchase order number. You ll call this

data = timeServiceReader.ReadToEnd(); } Console.WriteLine(data);

LDAP servers. The distinguished name for the master LDAP server information is given using the masterDN option and the binding password as masterPw. For the slave LDAP server, enter slaveDN and slavePw for its distinguished name and binding password respectively. The syntax for this file is identical to the smbldap.conf syntax.

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If you run the program, you ll see something like this:

55059 09-08-16 06:29:42 50 0 0 912.5 UTC(NIST) *

It s not strictly relevant to the use of sockets, but if you re interested, here s what the numbers this particular server returns all mean The first number is the number of days that have elapsed since midnight on November 17, 1858 (If you re curious to know why anyone might find that useful, search the Web for Modified Julian Date ) The set of three numbers that follows are the year, month, and date (2009, August 16 in this example), followed by the time of day as UTC (time zone zero, or as we British authors like to call it, Greenwich Mean Time) The 50 signifies that daylight saving time is in effect where the server is located, and the following two zeros indicate respectively that no leap second will be added this month and that the server believes it is not currently experiencing any problems.

You will now install smbldap-tools into your system to complete your setup 1 Download the smbldap-tools-095-1noarchrpm RPM package from http://downloadgnaorg/smbldap-tools/packages/smbldap-tools-0951noarchrpm and save it in root s home directory Change to that directory and install the package by entering rpm -Uvh --nodeps smbldap-tools-095-1noarchrpm The --nodeps option will force the smbldap-tools package to be installed to avoid the warning messages that the prerequisite Perl modules are not present Also, you did not use RPM packages to install the required Perl modules and they are not listed in the RPM database of your system 2 Start the Samba server by entering service smb start The running Samba server is needed later by smbldap-tools when creating its updated configuration files Run the smbldap-tools configuration file script, named configurepl and located in /usr/share/doc/smbldap-tools-095, by using the command /usr/share/doc/smbldap-tools-0.

The next number indicates that the server is deliberately advancing times by 9125 ms to compensate for transmission delays in the Internet That s all you need to do to use a service with sockets construct a suitably configured socket, call Connect, and then read data If the service you re using expects to be sent data, you can also write data into the NetworkStream Obviously, you need to be prepared for errors the Connect method will throw an exception if it is unable to connect to the service, and you should also be prepared to get errors anytime you try to read or write data with a socket; even if you connect successfully, parts of the network may later fail, severing the connection to the service Again, NET indicates this by throwing exceptions.

We ve looked at only half of the story so far what if you wanted to write a program that implements a service like the daytime service You can do this with the Socket class too, but it s a little more involved..

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