Receives up to maxlen bytes from socket using recvfrom(2) after O_NONBLOCK is set for the underlying file descriptor. flags is zero or more of the MSG_ options. The result, mesg, is the data received.
When recvfrom(2) returns 0, Socket#recv_nonblock returns an empty string as data. The meaning depends on the socket: EOF on TCP, empty packet on UDP, etc.
maxlen - the number of bytes to receive from the socket
flags - zero or more of the MSG_ options
buf - destination String buffer
options - keyword hash, supporting ‘exception: false`
serv = TCPServer.new("127.0.0.1", 0) af, port, host, addr = serv.addr c = TCPSocket.new(addr, port) s = serv.accept c.send "aaa", 0 begin # emulate blocking recv. p s.recv_nonblock(10) #=> "aaa" rescue IO::WaitReadable IO.select([s]) retry end
Refer to Socket#recvfrom for the exceptions that may be thrown if the call to recv_nonblock fails.
BasicSocket#recv_nonblock may raise any error corresponding to recvfrom(2) failure, including Errno::EWOULDBLOCK.
If the exception is Errno::EWOULDBLOCK or Errno::EAGAIN, it is extended by IO::WaitReadable. So IO::WaitReadable can be used to rescue the exceptions for retrying recv_nonblock.
By specifying a keyword argument exception to false, you can indicate that recv_nonblock should not raise an IO::WaitReadable exception, but return the symbol :wait_readable instead.
recvmsg receives a message using recvmsg(2) system call in non-blocking manner.
It is similar to BasicSocket#recvmsg but non-blocking flag is set before the system call and it doesn’t retry the system call.
By specifying a keyword argument exception to false, you can indicate that recvmsg_nonblock should not raise an IO::WaitReadable exception, but return the symbol :wait_readable instead.
Receives up to maxlen bytes from udpsocket using recvfrom(2) after O_NONBLOCK is set for the underlying file descriptor. flags is zero or more of the MSG_ options. The first element of the results, mesg, is the data received. The second element, sender_inet_addr, is an array to represent the sender address.
When recvfrom(2) returns 0, Socket#recvfrom_nonblock returns an empty string as data. It means an empty packet.
maxlen - the number of bytes to receive from the socket
flags - zero or more of the MSG_ options
outbuf - destination String buffer
options - keyword hash, supporting ‘exception: false`
require 'socket' s1 = UDPSocket.new s1.bind("127.0.0.1", 0) s2 = UDPSocket.new s2.bind("127.0.0.1", 0) s2.connect(*s1.addr.values_at(3,1)) s1.connect(*s2.addr.values_at(3,1)) s1.send "aaa", 0 begin # emulate blocking recvfrom p s2.recvfrom_nonblock(10) #=> ["aaa", ["AF_INET", 33302, "localhost.localdomain", "127.0.0.1"]] rescue IO::WaitReadable IO.select([s2]) retry end
Refer to Socket#recvfrom for the exceptions that may be thrown if the call to recvfrom_nonblock fails.
UDPSocket#recvfrom_nonblock may raise any error corresponding to recvfrom(2) failure, including Errno::EWOULDBLOCK.
If the exception is Errno::EWOULDBLOCK or Errno::EAGAIN, it is extended by IO::WaitReadable. So IO::WaitReadable can be used to rescue the exceptions for retrying recvfrom_nonblock.
By specifying a keyword argument exception to false, you can indicate that recvfrom_nonblock should not raise an IO::WaitReadable exception, but return the symbol :wait_readable instead.
s.rest_size is equivalent to s.rest.size.
Defines the callback event. If argument is omitted, this method defines the callback of all events. If you want to modify reference argument in callback, return hash in callback. If you want to return value to OLE server as result of callback use ‘return’ or :return.
ie = WIN32OLE.new('InternetExplorer.Application')
ev = WIN32OLE_EVENT.new(ie)
ev.on_event("NavigateComplete") {|url| puts url}
ev.on_event() {|ev, *args| puts "#{ev} fired"}
ev.on_event("BeforeNavigate2") {|*args|
...
# set true to BeforeNavigate reference argument `Cancel'.
# Cancel is 7-th argument of BeforeNavigate,
# so you can use 6 as key of hash instead of 'Cancel'.
# The argument is counted from 0.
# The hash key of 0 means first argument.)
{:Cancel => true} # or {'Cancel' => true} or {6 => true}
}
ev.on_event(...) {|*args|
{:return => 1, :xxx => yyy}
}
Returns major version.
tobj = WIN32OLE_TYPE.new('Microsoft Word 10.0 Object Library', 'Documents') puts tobj.major_version # => 8
Returns minor version.
tobj = WIN32OLE_TYPE.new('Microsoft Word 10.0 Object Library', 'Documents') puts tobj.minor_version # => 2
Returns the type library major version.
tlib = WIN32OLE_TYPELIB.new('Microsoft Excel 9.0 Object Library') puts tlib.major_version # -> 1
Returns the type library minor version.
tlib = WIN32OLE_TYPELIB.new('Microsoft Excel 9.0 Object Library') puts tlib.minor_version # -> 3
Reads at most maxlen bytes from the ARGF stream in non-blocking mode.
Builds a regular expression in @encoding. All chunks will be transcoded to that encoding.
Creates a single-column matrix where the values of that column are as given in column.
Matrix.column_vector([4,5,6])
=> 4
5
6
Returns an array of the column vectors of the matrix. See Vector.
Sets the system path (the Shell instance’s PATH environment variable).
path should be an array of directory name strings.
Returns a pretty printed object as a string.
In order to use this method you must first require the PP module:
require 'pp'
See the PP module for more information.
Parse a YAML string in yaml. Returns the Psych::Nodes::Stream. This method can handle multiple YAML documents contained in yaml. filename is used in the exception message if a Psych::SyntaxError is raised.
If a block is given, a Psych::Nodes::Document node will be yielded to the block as it’s being parsed.
Raises a Psych::SyntaxError when a YAML syntax error is detected.
Example:
Psych.parse_stream("---\n - a\n - b") # => #<Psych::Nodes::Stream:0x00> Psych.parse_stream("--- a\n--- b") do |node| node # => #<Psych::Nodes::Document:0x00> end begin Psych.parse_stream("--- `", "file.txt") rescue Psych::SyntaxError => ex ex.file # => 'file.txt' ex.message # => "(file.txt): found character that cannot start any token" end
See Psych::Nodes for more information about YAML AST.
Dump a list of objects as separate documents to a document stream.
Example:
Psych.dump_stream("foo\n ", {}) # => "--- ! \"foo\\n \"\n--- {}\n"
Load multiple documents given in yaml. Returns the parsed documents as a list. If a block is given, each document will be converted to Ruby and passed to the block during parsing
Example:
Psych.load_stream("--- foo\n...\n--- bar\n...") # => ['foo', 'bar'] list = [] Psych.load_stream("--- foo\n...\n--- bar\n...") do |ruby| list << ruby end list # => ['foo', 'bar']
Returns the version of libyaml being used
Returns the string which represents the version of zlib library.
Returns true if the contents of a file a and a file b are identical.
FileUtils.compare_file('somefile', 'somefile') #=> true FileUtils.compare_file('/dev/null', '/dev/urandom') #=> false
Returns true if the contents of a file a and a file b are identical.
FileUtils.compare_file('somefile', 'somefile') #=> true FileUtils.compare_file('/dev/null', '/dev/urandom') #=> false
Returns true if the method mid have an option opt.
p FileUtils.have_option?(:cp, :noop) #=> true p FileUtils.have_option?(:rm, :force) #=> true p FileUtils.have_option?(:rm, :preserve) #=> false