Module IO.WriteContext

Instructions: Use this module in your project

In the IDE (CLion, Visual Studio Code, Xcode, etc.) you use for your DkSDK project:

Add the following to your project's dependencies/CMakeLists.txt:

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DkSDKProject_DeclareAvailable(capnp
    CONSTRAINT "= "
    FINDLIBS capnp capnp.unix)
DkSDKProject_MakeAvailable(capnp)

Add the Findlib::capnp library to any desired targets in src/*/CMakeLists.txt:

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target_link_libraries(YourPackage_YourLibraryName
     # ... existing libraries, if any ...
     Findlib::capnp)

Click your IDE's Build button

Not using DkSDK?

FIRST, do one or all of the following:

Run:
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```
opam install capnp.null
```

Edit your dune-project and add:

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(package
  (name YourExistingPackage)
  (depends
  ; ... existing dependenices ...
  (capnp (>= ))))

Then run:

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dune build *.opam # if this fails, run: dune build

Edit your <package>.opam file and add:

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depends: [
  # ... existing dependencies ...
  "capnp" {>= ""}
]

Then run:

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opam install . --deps-only

FINALLY, add the capnp.unix library to any desired (library)and/or (executable) targets in your **/dune files:

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(library
  (name YourLibrary)
  ; ... existing library options ...
  (libraries
    ; ... existing libraries ...
    capnp.unix))

(executable
  (name YourExecutable)
  ; ... existing executable options ...
  (libraries
    ; ... existing libraries ...
    capnp.unix))

type ``'a t

val create : ``write:``('a ->``buf:string->``pos:int->``len:int->int)``-> ``compression:Capnp.Codecs.compression_t -> 'a -> 'a t

create ~write ~compression descr creates a new context for writing data to the specified descriptor. compression specifies the compression format, if any.

The semantics of the write function shall mimic that of Unix.single_write, attempting to write a substring from the buf and returning the number of bytes actually written.

valenqueue_message :'a t -> 'cap Capnp.Message.BytesMessage.Message.t -> unit

enqueue_message context message places the message in the outgoing queue of the write context. No data will be written to the underlying descriptor.

valbytes_remaining :'a t -> int

bytes_remaining context obtains the number of unwritten bytes currently stored in the write context.

valwrite :'a t -> int

write context attempts to write some of the queued data to the underlying descriptor associated with the write context.

returns

the number of bytes actually written

valwrite_message :'a t -> 'cap Capnp.Message.BytesMessage.Message.t -> unit

write_message context message places the message in the outgoing queue of the write context, then invokes write in a loop until all queued data has been written.

More from the DkSDK Book

1. DkSDK
1. 1. Package capnp
  1. 1. Module Capnp
    1. 1. Module Capnp.Array
      1. Module Capnp.BytesStorage
      1. Module Capnp.Codecs
      1. Module Capnp.Message
      1. Module Capnp.MessageSig
      1. Module type MessageSig.MESSAGE
        Module type MessageSig.S
        Module S.ListStorage
        Module S.Message
        Module S.Object
        Module S.Segment
        Module S.Slice
        Module S.StructStorage
        Module type MessageSig.SEGMENT
        Module type MessageSig.SLICE
      1. Module Capnp.RPC
      1. Module type RPC.S
        Module S.Capability
        Module S.ListStorage
        Module S.Message
        Module S.Object
        Module S.Segment
        Module S.Service
        Module S.Slice
        Module S.StructRef
        Module S.StructStorage
        Module S.Untyped
        Module M.ListStorage
        Module M.Message
        Module M.Object
        Module M.Segment
        Module M.Slice
        Module M.StructStorage
      1. Module Capnp.Runtime
    1. Module Capnp_unix
    1. 1. Module Capnp_unix.IO
      1. ...
        Module IO.WriteContext
        ...
  1. Package cmdliner
  1. 1. Module Cmdliner
    1. 1. Module Cmdliner.Arg
      1. Module Cmdliner.Cmd
      1. Module Cmdliner.Manpage
      1. Module Cmdliner.Term
    1. Module Cmdliner_arg
    1. Module Cmdliner_base
    1. Module Cmdliner_cline
    1. Module Cmdliner_cmd
    1. Module Cmdliner_docgen
    1. Module Cmdliner_eval
    1. Module Cmdliner_info
    1. 1. Module Cmdliner_info.Arg
      1. Module Cmdliner_info.Cmd
      1. Module Cmdliner_info.Env
      1. Module Cmdliner_info.Eval
      1. Module Cmdliner_info.Exit
    1. Module Cmdliner_manpage
    1. Module Cmdliner_msg
    1. Module Cmdliner_term
    1. Module Cmdliner_term_deprecated
    1. Module Cmdliner_trie
  1. Package fmt
  1. 1. Module Fmt
    1. 1. Module Fmt.Dump
    1. Module Fmt_cli
    1. Module Fmt_tty
  1. Package logs
  1. 1. Module Logs
    1. Module Logs_cli
    1. Module Logs_fmt
    1. Module Logs_lwt
    1. Module Logs_threaded
  1. Package lwt
  1. 1. Module Lwt
    1. 1. Module Lwt.Infix
      1. Module Lwt.Let_syntax
      1. Module Lwt.Syntax
    1. Module Lwt_bytes
    1. Module Lwt_condition
    1. Module Lwt_config
    1. Module Lwt_engine
    1. 1. Module Lwt_engine.Ev_backend
      1. Module Lwt_engine.Versioned
    1. Module Lwt_features
    1. Module Lwt_fmt
    1. Module Lwt_gc
    1. Module Lwt_io
    1. 1. Module Lwt_io.BE
      1. Module Lwt_io.LE
      1. Module Lwt_io.Versioned
    1. Module Lwt_list
    1. Module Lwt_main
    1. 1. Module Lwt_main.Enter_iter_hooks
      1. Module Lwt_main.Exit_hooks
      1. Module Lwt_main.Leave_iter_hooks
    1. Module Lwt_mutex
    1. Module Lwt_mvar
    1. Module Lwt_pool
    1. Module Lwt_pqueue
    1. 1. Module Lwt_pqueue.Make
    1. Module Lwt_preemptive
    1. Module Lwt_process
    1. Module Lwt_result
    1. 1. Module Lwt_result.Infix
      1. Module Lwt_result.Let_syntax
      1. Module Lwt_result.Syntax
    1. Module Lwt_seq
    1. Module Lwt_sequence
    1. Module Lwt_stream
    1. Module Lwt_switch
    1. Module Lwt_sys
    1. Module Lwt_throttle
    1. 1. Module Lwt_throttle.Make
    1. Module Lwt_timeout
    1. Module Lwt_unix
    1. 1. Module Lwt_unix.IO_vectors
      1. Module Lwt_unix.LargeFile
      1. Module Lwt_unix.Versioned
  1. Package mtime
  1. 1. Module Mtime
    1. 1. Module Mtime.Span
    1. Module Mtime_clock
  1. Package ocaml
  1. 1. Module Bigarray
    1. Module Condition
    1. Module Dynlink
    1. Module Event
    1. Module Mutex
    1. Module Profiling
    1. Module Semaphore
    1. 1. Module Semaphore.Binary
      1. Module Semaphore.Counting
    1. Module Stdlib
    1. 1. Module Stdlib.Arg
      1. Module Stdlib.Array
      1. Module Stdlib.ArrayLabels
      1. Module Stdlib.Atomic
      1. Module Stdlib.Bigarray
      1. Module Stdlib.Bool
      1. Module Stdlib.Buffer
      1. Module Stdlib.Bytes
      1. Module Stdlib.BytesLabels
      1. Module Stdlib.Callback
      1. Module Stdlib.Char
      1. Module Stdlib.Complex
      1. Module Stdlib.Digest
      1. Module Stdlib.Either
      1. Module Stdlib.Ephemeron
      1. Module Stdlib.Filename
      1. Module Stdlib.Float
      1. Module Stdlib.Format
      1. Module Stdlib.Fun
      1. Module Stdlib.Gc
      1. Module Stdlib.Genlex
      1. Module Stdlib.Hashtbl
      1. Module type Hashtbl.HashedType
        Module type Hashtbl.S
        Module type Hashtbl.SeededHashedType
        Module type Hashtbl.SeededS
      1. Module Stdlib.In_channel
      1. Module Stdlib.Int
      1. Module Stdlib.Int32
      1. Module Stdlib.Int64
      1. Module Stdlib.LargeFile
      1. Module Stdlib.Lazy
      1. Module Stdlib.Lexing
      1. Module Stdlib.List
      1. Module Stdlib.ListLabels
      1. Module Stdlib.Map
      1. Module type Map.OrderedType
        Module type Map.S
      1. Module Stdlib.Marshal
      1. Module Stdlib.MoreLabels
      1. Module Stdlib.Nativeint
      1. Module Stdlib.Obj
      1. Module Stdlib.Oo
      1. Module Stdlib.Option
      1. Module Stdlib.Out_channel
      1. Module Stdlib.Parsing
      1. Module Stdlib.Pervasives
      1. Module Stdlib.Printexc
      1. Module Stdlib.Printf
      1. Module Stdlib.Queue
      1. Module Stdlib.Random
      1. Module Stdlib.Result
      1. Module Stdlib.Scanf
      1. Module Stdlib.Seq
      1. Module Stdlib.Set
      1. Module type Set.OrderedType
        Module type Set.S
      1. Module Stdlib.Stack
      1. Module Stdlib.StdLabels
      1. Module Stdlib.Stream
      1. Module Stdlib.String
      1. Module Stdlib.StringLabels
      1. Module Stdlib.Sys
      1. Module Stdlib.Uchar
      1. Module Stdlib.Unit
      1. Module Stdlib.Weak
      1. Module type Weak.S
    1. Module Str
    1. Module Thread
    1. Module ThreadUnix
    1. Module Topdirs
    1. Module Unix
    1. 1. Module Unix.LargeFile
    1. Module UnixLabels
    1. 1. Module UnixLabels.LargeFile
      1. Module EndianBigstring
      1. Module type EndianBigstring.EndianBigstringSig
      1. Module EndianBytes
      1. Module type EndianBytes.EndianBytesSig
      1. Module EndianString
      1. Module type EndianString.EndianStringSig
  1. Package
  1. Package result
  1. 1. Module Result
  1. Package stdint
  1. 1. Module Stdint
    1. 1. Module Stdint.Int128
      1. Module Stdint.Int16
      1. Module Stdint.Int24
      1. Module Stdint.Int32
      1. Module Stdint.Int40
      1. Module Stdint.Int48
      1. Module Stdint.Int56
      1. Module Stdint.Int64
      1. Module Stdint.Int8
      1. Module Stdint.Uint128
      1. Module Stdint.Uint16
      1. Module Stdint.Uint24
      1. Module Stdint.Uint32
      1. Module Stdint.Uint40
      1. Module Stdint.Uint48
      1. Module Stdint.Uint56
      1. Module Stdint.Uint64
      1. Module Stdint.Uint8