BinaryReader.Read Method (Char(), Int32, Int32)
Reads count characters from the stream with index as the starting point in the character array.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Overridable Function Read ( _ buffer As Char(), _ index As Integer, _ count As Integer _ ) As Integer 'Usage Dim instance As BinaryReader Dim buffer As Char() Dim index As Integer Dim count As Integer Dim returnValue As Integer returnValue = instance.Read(buffer, index, _ count)
- Type: System.Char()
The buffer to read data into.
- Type: System.Int32
The starting point in the buffer at which to begin reading into the buffer.
- Type: System.Int32
The number of characters to read.
Return ValueType: System.Int32
The total number of characters read into the buffer. This might be less than the number of characters requested if that many characters are not currently available, or it might be zero if the end of the stream is reached.
The buffer length minus index is less than count.
The number of decoded characters to read is greater than count. This can happen if a Unicode decoder returns fallback characters or a surrogate pair.
buffer is Nothing.
index or count is negative.
The stream is closed.
An I/O error occurs.
The following example shows how to read and write data using memory as a backing store. This example displays a list of invalid file path characters to the console. Although the code tries to display a list of all invalid file path characters, not all of the characters are within the displayable set of characters. Because the list of invalid characters can vary based on the system, output for this code may also vary.
Imports System Imports System.IO Public Class BinaryRW Shared Sub Main() Dim invalidPathChars() As Char = Path.InvalidPathChars Dim memStream As new MemoryStream() Dim binWriter As New BinaryWriter(memStream) ' Write to memory. binWriter.Write("Invalid file path characters are: ") binWriter.Write(Path.InvalidPathChars, 0, _ Path.InvalidPathChars.Length) ' Create the reader using the same MemoryStream ' as used with the writer. Dim binReader As New BinaryReader(memStream) ' Set Position to the beginning of the stream. memStream.Position = 0 ' Read the data from memory and write it to the console. Console.Write(binReader.ReadString()) Dim upperBound As Integer = _ CInt(memStream.Length - memStream.Position) - 1 Dim memoryData(upperBound) As Char binReader.Read(memoryData, 0, upperBound) Console.WriteLine(memoryData) End Sub End Class
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.