| Description |
If the current stream has not been exhausted, the next block of bytes are returned.
The stream position is updated accordingly.
An attempt is made to read up to Count bytes. These bytes are overlaid onto the Bytes array from StartIndex. The returned integer value is the number of bytes overlaid. Zero if the stream was already exhausted before the read.
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| | Notes | You must set the length of the target Byte array in the second syntax, and it must have sufficient capacity to hold the returned bytes.
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| Microsoft MSDN Links |
System.IO
System.IO.FileStream
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| Reading blocks of bytes |
program Project1;
{$APPTYPE CONSOLE}
uses
System.IO;
var
Stream : System.IO.FileStream;
ByteArray : Array of Byte;
Index : Integer;
begin
// Create our File Stream
Stream := System.IO.FileStream.Create('C:DelphiBasics.txt', FileMode.Create);
// Write to the stream
Stream.WriteByte(1);
Stream.WriteByte(2);
Stream.WriteByte(3);
Stream.WriteByte(4);
Stream.WriteByte(5);
Stream.WriteByte(6);
Stream.WriteByte(7);
Stream.WriteByte(8);
Stream.WriteByte(9);
// Move to the start of the stream
Stream.Seek(0, SeekOrigin.Begin);
// Declare our array to hold the returned data
SetLength(ByteArray, 12);
// Get the stream contents 3 characters at a time into our array
Index := 0;
while Stream.Read(ByteArray, Index, 3) > 0 do
Index := Index + 3;
// Display our array contents
for Index := 0 to Length(ByteArray)-1 do
Console.WriteLine(ByteArray[Index].ToString);
// Close the file stream
Stream.Close;
Console.Readline;
end.
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