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C# 30: A Beginner s Guide
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Method
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bool ReadBoolean( ) byte ReadByte( ) sbyte ReadSByte( ) byte[ ] ReadBytes(int num) char ReadChar( ) char[ ] ReadChars(int num) double ReadDouble( ) float ReadSingle( ) short ReadInt16( ) int ReadInt32( ) long ReadInt64( ) ushort ReadUInt16( ) uint ReadUInt32( ) ulong ReadUInt64( ) string ReadString( )
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Description
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Reads a bool Reads a byte Reads an sbyte Reads num bytes and returns them as an array Reads a char Reads num characters and returns them as an array Reads a double Reads a float Reads a short Reads an int Reads a long Reads a ushort Reads a uint Reads a ulong Reads a string
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Table 11-6 Commonly Used Input Methods Defined by BinaryReader
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Demonstrating Binary I/O
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Here is a program that demonstrates BinaryReader and BinaryWriter It writes and then reads back various types of data to and from a file
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// Write and then read back binary data using System; using SystemIO; class RWData { static void Main() { BinaryWriter dataOut; BinaryReader dataIn; int i = 10; double d = 102356; bool b = true; try { dataOut = new BinaryWriter(new FileStream("testdata", FileModeCreate)); }
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11: Using I/O
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catch(IOException exc) { ConsoleWriteLine(excMessage); return; } // Write data to a file try { ConsoleWriteLine("Writing " + i); dataOutWrite(i); ConsoleWriteLine("Writing " + d); dataOutWrite(d); ConsoleWriteLine("Writing " + b); dataOutWrite(b); ConsoleWriteLine("Writing " + 122 * 74); dataOutWrite(122 * 74); } catch(IOException exc) { ConsoleWriteLine(excMessage); } dataOutClose(); ConsoleWriteLine(); // Now, read the data try { dataIn = new BinaryReader(new FileStream("testdata", FileModeOpen)); } catch(IOException exc) { ConsoleWriteLine(excMessage); return; } try { i = dataInReadInt32(); ConsoleWriteLine("Reading " + i); d = dataInReadDouble(); ConsoleWriteLine("Reading " + d); b = dataInReadBoolean(); ConsoleWriteLine("Reading " + b); d = dataInReadDouble(); ConsoleWriteLine("Reading " + d); }
Write binary data
Read binary data
C# 30: A Beginner s Guide
catch(IOException exc) { ConsoleWriteLine(excMessage); } dataInClose(); } }
The output from the program is shown here:
Writing Writing Writing Writing Reading Reading Reading Reading 10 102356 True 9028 10 102356 True 9028
Random Access Files
Up to this point, we have been using sequential files, which are files that are accessed in a strictly linear fashion, one byte after another However, you can also access the contents of a file in random order To do this, you will use the Seek( ) method defined by FileStream This method allows you to set the file position indicator (also called the file pointer) to any point within a file The method Seek( ) is shown here: long Seek(long newPos, SeekOrigin origin) Here, newPos specifies the new position, in bytes, of the file pointer from the location specified by origin The origin will be one of these values, which are defined by the SeekOrigin enumeration:
Value
Begin Current End
Meaning
Seek from the beginning of the file Seek from the current location Seek from the end of the file
After a call to Seek( ), the next read or write operation will occur at the new file position If an error occurs while seeking, an IOException is thrown If the underlying stream does not support position requests, a NotSupportedException is thrown Other exceptions are possible Here is an example that demonstrates random access I/O It writes the uppercase alphabet to a file and then reads it back in nonsequential order
11: Using I/O
// Demonstrate random access using System; using SystemIO; class RandomAccessDemo { static void Main() { FileStream f; char ch; try { f = new FileStream("randomdat", FileModeCreate); } catch(IOException exc) { ConsoleWriteLine(excMessage); return ; } // Write the alphabet for(int i=0; i < 26; i++) { try { fWriteByte((byte)('A'+i)); } catch(IOException exc) { 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: ");
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