barcode generator c# source code The C# Language in Visual C#.NET

Encoder Denso QR Bar Code in Visual C#.NET The C# Language

The C# Language
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However, if you want to cause data to be written to the physical device whether the buffer is full or not, you can call Flush( ), shown here: void Flush( ) An IOException is thrown on failure If the stream is closed, ObjectDisposedException is thrown Once you are done with an output file, you must remember to close it using Close( ) Doing so ensures that any output remaining in a disk buffer is actually written to the disk Thus, there is no reason to call Flush( ) before closing a file Here is a simple example that writes to a file:
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// Write to a file using System; using SystemIO; class WriteToFile { static void Main(string[] args) { FileStream fout; // Open output file try { fout = new FileStream("testtxt", FileModeCreate); } catch(IOException exc) { ConsoleWriteLine("Cannot Open File"); ConsoleWriteLine(excMessage); return; } // Write the alphabet to the file try { for(char c = 'A'; c <= 'Z'; c++) foutWriteByte((byte) c); } catch(IOException exc) { ConsoleWriteLine("Error Writing File"); ConsoleWriteLine(excMessage); } foutClose(); } }
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The program first opens a file called testtxt for output It then writes the uppercase alphabet to the file Finally, it closes the file Notice how possible I/O errors are handled by the try/catch blocks After this program executes, testtxt will contain the following output:
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Using FileStream to Copy a File
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One advantage to the byte-oriented I/O used by FileStream is that you can use it on any type of file not just those that contain text For example, the following program copies any type of file, including executable files The names of the source and destination files are specified on the command line
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/* Copy a file To use this program, specify the name of the source file and the destination file For example, to copy a file called FIRSTDAT to a file called SECONDDAT, use the following command line: CopyFile FIRSTDAT SECONDDAT */ using System; using SystemIO; class CopyFile { static void Main(string[] args) { int i; FileStream fin; FileStream fout; if(argsLength != 2) { ConsoleWriteLine("Usage: CopyFile From To"); return; } // Open input file try { fin = new FileStream(args[0], FileModeOpen); } catch(IOException exc) { ConsoleWriteLine("Cannot Open Input File"); ConsoleWriteLine(excMessage); return; } // Open output file try { fout = new FileStream(args[1], FileModeCreate); } catch(IOException exc) { ConsoleWriteLine("Cannot Open Output File"); ConsoleWriteLine(excMessage); finClose(); return; } // Copy File try { do { i = finReadByte(); if(i != -1) foutWriteByte((byte)i); } while(i != -1); } catch(IOException exc) { ConsoleWriteLine("Error Copying File"); ConsoleWriteLine(excMessage); } finClose();
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PART I PART I PART I
Part I:
The C# Language
foutClose(); } }
Character-Based File I/O
Although byte-oriented file handling is quite common, it is possible to use character-based streams for this purpose The advantage to the character streams is that they operate directly on Unicode characters Thus, if you want to store Unicode text, the character streams are certainly your best option In general, to perform character-based file operations, you will wrap a FileStream inside either a StreamReader or a StreamWriter These classes automatically convert a byte stream into a character stream, and vice versa Remember, at the operating system level, a file consists of a set of bytes Using a StreamReader or StreamWriter does not alter this fact StreamWriter is derived from TextWriter StreamReader is derived from TextReader Thus, StreamWriter and StreamReader have access to the methods and properties defined by their base classes
Using StreamWriter
To create a character-based output stream, wrap a Stream object (such as a FileStream) inside a StreamWriter StreamWriter defines several constructors One of its most popular is shown here: StreamWriter(Stream stream) Here, stream is the name of an open stream This constructor throws an ArgumentException if stream is not opened for output and an ArgumentNullException if stream is null Once created, a StreamWriter automatically handles the conversion of characters to bytes Here is a simple key-to-disk utility that reads lines of text entered at the keyboard and writes them to a file called testtxt Text is read until the user enters the word stop It uses a FileStream wrapped in a StreamWriter to output to the file
// A simple key-to-disk utility that demonstrates a StreamWriter using System; using SystemIO; class KtoD { static void Main() { string str; FileStream fout; try { fout = new FileStream("testtxt", FileModeCreate); } catch(IOException exc) { ConsoleWriteLine("Cannot Open File"); ConsoleWriteLine(excMessage); return ; } StreamWriter fstr_out = new StreamWriter(fout);
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