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Return data read from the socket, but do not remove it from the
socket buffer.
Syntax
object.Peek( Buffer, [Length] )
Parameters
- Buffer
- A buffer that the data will be stored in. If the variable is a
String then the data will be returned as a string of characters.
This is the most appropriate data type to use if the server is
sending data that consists of printable characters. If the server
is sending binary data, it is recommended that a Byte array be
used instead. This parameter must be passed by reference.
- Length
- A numeric value which specifies the number of bytes to read.
Its maximum value is 231-1 = 2147483647. This argument
is required to be present for string data. If a value is specified
for this argument for other permissible types of data, and it is
less than number of bytes that is determined by the control, then
Length will override the internally computed value. If the
argument is omitted, then the maximum number of bytes to read is
determined by the size of the buffer.
Return Value
If the method succeeds, it will return the number of bytes
available to read from the socket without causing the thread to
block. A return value of zero indicates that there is no data
available to read at that time. If an error occurs, a value of -1 is
returned.
Remarks
The Peek method reads the specified number of bytes from
the socket and copies them into the buffer, but it does not remove
the data from the internal socket buffer. Note that it is possible
for the returned data to contain embedded null characters.
The data returned by the Peek method is not removed from
the socket buffers. It must be consumed by a subsequent call to the
Read method. The return value indicates the number of bytes
that can be read in a single operation, up to the specified buffer
size. However, it is important to note that it may not indicate the
total amount of data available to be read from the socket at that
time.
If no data is available to be read, the method will return a value
of zero. Using this method in a loop to poll a non-blocking socket
may cause the application to become non-responsive. To determine if
there is data available to be read, use the IsReadable
property.
See Also
IsReadable Property,
Read Method, ReadLine
Method, Write Method,
WriteLine Method,
OnRead Event,
OnWrite Event
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