barcode printing using c#.net Using I/O in Visual C#

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Using I/O
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catch(IOException exc) { ConsoleWriteLine("Cannot Open File"); ConsoleWriteLine(excMessage); return ; } // Write the alphabet for(int i=0; i < 26; i++) { try { fWriteByte((byte)('A'+i)); } catch(IOException exc) { ConsoleWriteLine("Error Writing File"); ConsoleWriteLine(excMessage); fClose(); return ; } } try { // Now, read back specific values fSeek(0, SeekOriginBegin); // seek to first byte ch = (char) fReadByte(); ConsoleWriteLine("First value is " + ch); fSeek(1, SeekOriginBegin); // seek to second byte ch = (char) fReadByte(); ConsoleWriteLine("Second value is " + ch); fSeek(4, SeekOriginBegin); // seek to 5th byte ch = (char) fReadByte(); ConsoleWriteLine("Fifth value is " + ch); ConsoleWriteLine(); // Now, read every other value ConsoleWriteLine("Here is every other value: "); for(int i=0; i < 26; i += 2) { fSeek(i, SeekOriginBegin); // seek to ith character ch = (char) fReadByte(); ConsoleWrite(ch + " "); } } catch(IOException exc) { ConsoleWriteLine("Error Reading or Seeking"); ConsoleWriteLine(excMessage); } ConsoleWriteLine(); fClose(); } }
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PART I PART I PART I
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Part I:
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First value is A Second value is B Fifth value is E Here is every other value: A C E G I K M O Q S U W Y
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Although Seek( ) offers the greatest flexibility, there is another way to set the current file position You can use the Position property As shown previously in Table 14-2, Position is a read/write property Therefore, you can use it to obtain the current position or to set the current position For example, here is the code sequence from the preceding program that reads the randomdat file, rewritten to use the Position property:
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// Use Position rather than Seek() to set the current // file position try { fPosition = 0; ch = (char) fReadByte(); ConsoleWriteLine("First value is " + ch); fPosition = 1; ch = (char) fReadByte(); ConsoleWriteLine("Second value is " + ch); fPosition = 4; ch = (char) fReadByte(); ConsoleWriteLine("Fifth value is " + ch); ConsoleWriteLine(); // Now, read every other value ConsoleWriteLine("Here is every other value: "); for(int i=0; i < 26; i += 2) { fPosition = i; // seek to ith character ch = (char) fReadByte(); ConsoleWrite(ch + " "); } } catch(IOException exc) { ConsoleWriteLine("Error Reading or Seeking"); ConsoleWriteLine(excMessage); }
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Using MemoryStream
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Sometimes it is useful to read input from or to write output to an array, rather than directly from or to a device To do this, you will use MemoryStream MemoryStream is an implementation of Stream that uses an array of bytes for input and/or output MemoryStream defines several constructors Here is the one we will use: MemoryStream(byte[ ] buf)
14:
Using I/O
Here, buf is an array of bytes that will be used for the source and/or target of I/O requests The stream created by this constructor can be written or read, and supports Seek( ) When using this constructor, you must remember to make buf large enough to hold whatever output you will be directing to it Here is a program that demonstrates the use of MemoryStream:
// Demonstrate MemoryStream using System; using SystemIO; class MemStrDemo { static void Main() { byte[] storage = new byte[255]; // Create a memory-based stream MemoryStream memstrm = new MemoryStream(storage); // Wrap memstrm in a reader and a writer StreamWriter memwtr = new StreamWriter(memstrm); StreamReader memrdr = new StreamReader(memstrm); // Write to storage, through memwtr for(int i=0; i < 10; i++) memwtrWriteLine("byte [" + i + "]: " + i); // Put a period at the end memwtrWriteLine(""); memwtrFlush(); ConsoleWriteLine("Reading from storage directly: "); // Display contents of storage directly foreach(char ch in storage) { if (ch == '') break; ConsoleWrite(ch); } ConsoleWriteLine("\nReading through memrdr: "); // Read from memstrm using the stream reader memstrmSeek(0, SeekOriginBegin); // reset file pointer string str = memrdrReadLine(); while(str != null) { str = memrdrReadLine(); if(strCompareTo("") == 0) break; ConsoleWriteLine(str); } } }
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