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} if (tmp == -1) { /* There is nothing to read */ return(null); } if (tmp != 0) { /* Add character to StringBuffer */ strbufappend((char)tmp); } } while (tmp != '\n'); /* Return the String of the StringBuffer */ return(strbuftoString()); } } If we compile this file and run the server, we can then telnet into port 6001 and type a string The string is printed out on the server output and then the server exits It is worth walking through the code to explain what is happening The first class, server1, just contains the main() method that all applications have to implement The class creates a new instance of simpleServer and passes the port we wish to use as an argument All of the work happens in the simpleServer class Looking at the constructor, we can see that the first line of code is: sock = new ServerSocket(port); This creates a new ServerSocket called sock What is a socket Well, without going into much detail, a socket is a combination of a host and a port A host is a (possibly) remote computer which supports the TCP/IP protocol and a port is the part of the computer that you talk to for a given service So certain ports are used for sending email, starting terminal sessions and even playing games You can think of a port as a way of telling the computer which software or service you would like to use The ServerSocket creates a network connection on the machine which is prepared to accept connections from client machines in order to provide some kind of service The number that is passed as an argument specifies which port we want to use In order to let clients access our simple service the client software must have some prior knowledge of the port number that we are using Well-known services have a set of ports which are universally recognized and ports that have a number less than 1024 are considered special on many implementations of TCP/IP and require system privileges to be used The danger in selecting a port at random is that if your software is later moved to another server, it is possible that another piece of network software is already expecting to use the port that you have selected and your software will die reporting that the port is in use The best way of dealing with this is to provide a mechanism for allowing the user to specify an alternative port on the command line which can override the default that the software uses At the moment, we have created the socket connection for the server but nothing else will happen We need to tell the socket that it should accept a connection when one arrives This is done with the call: conn = sockaccept(); This tells the ServerSocket that it should wait for a connection Because it is impossible to predict when a connection request will arrive from a client, making the call blocks the thread of execution until a connection is made to the port Until this happens no other lines of code are processed This is fine when the server is expected to cope with only one client, but if there are multiple clients, having the entire execution halted until another client arrives is not workable we will return to this problem later in the chapter and show you a solution Notice that the call to accept() is grouped with the ServerSocket call, so that if there are problems establishing the port the code doesn t send a message to an object which could not be created If there are problems in establishing the ServerSocket, then the error is printed to the out channel and the application exits by means of the code: Systemexit(1). edit pdf file using itextsharp c# C# tutorial: add content to an existing PDF document
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The C# and VB.NET PDF Library. C Sharp ASP .NET PDF Generator / Writer. A DLL in C# asp.net to generate and Edit PDF documents in .Net framework and . HTML to PDF · ASPX to PDF Converter · VB.Net PDF · PDF ASP.NET Software Many validation schemes involve placing error messages next to the offending input element This makes it obvious to the user which field is in error For convenience, all the problems with the data a user has entered in a form are often summarized in a list or paragraph somewhere on the page It is important that both client-side and server-side validation be incorporated when possible For any particular form field, we may want to perform multiple types of validation and display a different error message depending on the particular validation that failed For example, we might want to display a message such as "Please enter an e-mail address" if the user has neglected to enter an e-mail address, but we would want a message such as "The e-mail address is not formatted correctly" if the user has given us a badly formatted e-mail address We also want to be able to validate interdependent fields For example, we may want to verify that a password field and a password verification field contain the same value Finally, it is convenient to use regular expressions when performing validation itextsharp edit existing pdf c# Create, Read, Fill, Update, Delete Pdf Form Fields in C#.NET - Fill ...
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C# ASP.NET VB.NET library to generate edit and parse PDF files. Library converts PDF to multiple formats including DOC, DOCX, XLS, XLSX, PPTX HTML and ... This chapter discussed the following: The Silverlight layout design principles How to use the Canvas, StackPanel, Grid, and Border elements How to build custom layout elements // File: namecs Configuration using System; using SystemWeb; HTTP pipeline using SystemWebUI; namespace EssentialAspDotNetCustomControls Validation { public class NameControl : Control { Data binding private string _name; Custom controls private bool _isImportant; . public string Name { State management get { return _name; } set { _name = value; } O C R E AT E A rich media application, you need to play high quality content sources, visually integrate with your application display, and deliver full screen experiences Silverlight supports HD quality Windows Media Video (WMV) and H264 video with a variety of different content delivery methods including progressive download, live broadcast streaming, and adaptive bit-rate streaming To integrate video with your application, you need to create a set of player controls that t seamlessly with your design You may need to integrate information about the video content in the application itself For example, if you are watching a sporting event, you may want to see a summary of the highlights or view related statistics To integrate additional information, you need to use media meta-data in the video synchronized with some event in your application One other consideration when delivering media is providing full screen experiences Full screen is often challenging because it requires seamless transition from the browser and needs to be high performance This chapter describes how you can play media les, how you can integrate media with your application, and how you can deliver full screen experiences In particular, this chapter discusses the following: } [ Team LiB ] public bool IsImportant { get { return _isImportant; } set { _isImportant = value; } } protected override void Render(HtmlTextWriter writer) { string txt; if (_isImportant) txt = stringFormat("<h1>{0}</h1>", _name); else txt = stringFormat("<h2>{0}</h2>", _name); Table of Contents writerWrite(txt); } Essential ASPNET with Examples in C# } Onion ByFritz } Publisher : Addison Wesley Pubdeploy this control, we would first compile it into an assembly and then deploy that assembly into the : February 11, 2003 To Date ISBN directory of the ASPNET application in which it was to be used Alternatively, we could sign the : 0-201-76040-1 /bin Pages : 432 compiled assembly with a public/private key pair and deploy it in the global assembly cache so that it could easily be accessed on a machine-wide basis A sample showing how to compile and deploy this from the command prompt is shown in Listing 8-3 Listing 8-3 Command-Line Compilation of extensive knowledge and priceless experience overflowing "This well-conceived and well-written book hasNameControl from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom The Silverlight media design principles How to use media elements in your application How the media system works under the hood c# create editable pdf Read, Edit and manipulate PDF documents in C# windows application ...
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