<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <link rel="stylesheet" href="style.css" type="text/css"> <meta content="text/html; charset=iso-8859-1" http-equiv="Content-Type"> <link rel="Start" href="index.html"> <link rel="Up" href="Scanf.html"> <link title="Index of types" rel=Appendix href="index_types.html"> <link title="Index of exceptions" rel=Appendix href="index_exceptions.html"> <link title="Index of values" rel=Appendix href="index_values.html"> <link title="Index of modules" rel=Appendix href="index_modules.html"> <link title="Index of module types" rel=Appendix href="index_module_types.html"> <link title="Arg" rel="Chapter" href="Arg.html"> <link title="Arith_status" rel="Chapter" href="Arith_status.html"> <link title="Array" rel="Chapter" href="Array.html"> <link title="ArrayLabels" rel="Chapter" href="ArrayLabels.html"> <link title="Big_int" rel="Chapter" href="Big_int.html"> <link title="Bigarray" rel="Chapter" href="Bigarray.html"> <link title="Buffer" rel="Chapter" href="Buffer.html"> <link title="Callback" rel="Chapter" href="Callback.html"> <link title="CamlinternalLazy" rel="Chapter" href="CamlinternalLazy.html"> <link title="CamlinternalMod" rel="Chapter" href="CamlinternalMod.html"> <link title="CamlinternalOO" rel="Chapter" href="CamlinternalOO.html"> <link title="Char" rel="Chapter" href="Char.html"> <link title="Complex" rel="Chapter" href="Complex.html"> <link title="Condition" rel="Chapter" href="Condition.html"> <link title="Digest" rel="Chapter" href="Digest.html"> <link title="Dynlink" rel="Chapter" href="Dynlink.html"> <link title="Event" rel="Chapter" href="Event.html"> <link title="Filename" rel="Chapter" href="Filename.html"> <link title="Format" rel="Chapter" href="Format.html"> <link title="Gc" rel="Chapter" href="Gc.html"> <link title="Genlex" rel="Chapter" href="Genlex.html"> <link title="Graphics" rel="Chapter" href="Graphics.html"> <link title="GraphicsX11" rel="Chapter" href="GraphicsX11.html"> <link title="Hashtbl" rel="Chapter" href="Hashtbl.html"> <link title="Int32" rel="Chapter" href="Int32.html"> <link title="Int64" rel="Chapter" href="Int64.html"> <link title="Lazy" rel="Chapter" href="Lazy.html"> <link title="Lexing" rel="Chapter" href="Lexing.html"> <link title="List" rel="Chapter" href="List.html"> <link title="ListLabels" rel="Chapter" href="ListLabels.html"> <link title="Map" rel="Chapter" href="Map.html"> <link title="Marshal" rel="Chapter" href="Marshal.html"> <link title="MoreLabels" rel="Chapter" href="MoreLabels.html"> <link title="Mutex" rel="Chapter" href="Mutex.html"> <link title="Nativeint" rel="Chapter" href="Nativeint.html"> <link title="Num" rel="Chapter" href="Num.html"> <link title="Obj" rel="Chapter" href="Obj.html"> <link title="Oo" rel="Chapter" href="Oo.html"> <link title="Parsing" rel="Chapter" href="Parsing.html"> <link title="Pervasives" rel="Chapter" href="Pervasives.html"> <link title="Printexc" rel="Chapter" href="Printexc.html"> <link title="Printf" rel="Chapter" href="Printf.html"> <link title="Queue" rel="Chapter" href="Queue.html"> <link title="Random" rel="Chapter" href="Random.html"> <link title="Ratio" rel="Chapter" href="Ratio.html"> <link title="Scanf" rel="Chapter" href="Scanf.html"> <link title="Set" rel="Chapter" href="Set.html"> <link title="Sort" rel="Chapter" href="Sort.html"> <link title="Stack" rel="Chapter" href="Stack.html"> <link title="StdLabels" rel="Chapter" href="StdLabels.html"> <link title="Str" rel="Chapter" href="Str.html"> <link title="Stream" rel="Chapter" href="Stream.html"> <link title="String" rel="Chapter" href="String.html"> <link title="StringLabels" rel="Chapter" href="StringLabels.html"> <link title="Sys" rel="Chapter" href="Sys.html"> <link title="Thread" rel="Chapter" href="Thread.html"> <link title="ThreadUnix" rel="Chapter" href="ThreadUnix.html"> <link title="Tk" rel="Chapter" href="Tk.html"> <link title="Unix" rel="Chapter" href="Unix.html"> <link title="UnixLabels" rel="Chapter" href="UnixLabels.html"> <link title="Weak" rel="Chapter" href="Weak.html"><title>Scanf.Scanning</title> </head> <body> <div class="navbar"> <a class="up" href="Scanf.html" title="Scanf">Up</a> </div> <h1>Module <a href="type_Scanf.Scanning.html">Scanf.Scanning</a></h1> <pre><span class="keyword">module</span> Scanning: <code class="code"><span class="keyword">sig</span></code> <a href="Scanf.Scanning.html">..</a> <code class="code"><span class="keyword">end</span></code></pre><hr width="100%"> <pre><span id="TYPEin_channel"><span class="keyword">type</span> <code class="type"></code>in_channel</span> </pre> <div class="info "> The notion of input channel for the <code class="code"><span class="constructor">Scanf</span></code> module: those channels provide all the machinery necessary to read from a given <code class="code"><span class="constructor">Pervasives</span>.in_channel</code> value. A <code class="code"><span class="constructor">Scanf</span>.<span class="constructor">Scanning</span>.in_channel</code> value is also called a <i>formatted input channel</i> or equivalently a <i>scanning buffer</i>. The type <code class="code">scanbuf</code> below is an alias for <code class="code">in_channel</code>.<br> <b>Since</b> 3.12.0<br> </div> <pre><span id="TYPEscanbuf"><span class="keyword">type</span> <code class="type"></code>scanbuf</span> = <code class="type"><a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code> </pre> <div class="info "> The type of scanning buffers. A scanning buffer is the source from which a formatted input function gets characters. The scanning buffer holds the current state of the scan, plus a function to get the next char from the input, and a token buffer to store the string matched so far. <p> Note: a scanning action may often require to examine one character in advance; when this 'lookahead' character does not belong to the token read, it is stored back in the scanning buffer and becomes the next character yet to be read.<br> </div> <pre><span id="VALstdin"><span class="keyword">val</span> stdin</span> : <code class="type"><a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code></pre><div class="info "> The standard input notion for the <code class="code"><span class="constructor">Scanf</span></code> module. <code class="code"><span class="constructor">Scanning</span>.stdin</code> is the formatted input channel attached to <code class="code"><span class="constructor">Pervasives</span>.stdin</code>. <p> Note: in the interactive system, when input is read from <code class="code">stdin</code>, the newline character that triggers the evaluation is incorporated in the input; thus, the scanning specifications must properly skip this additional newline character (for instance, simply add a <code class="code"><span class="string">'\n'</span></code> as the last character of the format string).<br> <b>Since</b> 3.12.0<br> </div> <pre><span id="TYPEfile_name"><span class="keyword">type</span> <code class="type"></code>file_name</span> = <code class="type">string</code> </pre> <div class="info "> A convenient alias to designate a file name.<br> <b>Since</b> 4.00.0<br> </div> <pre><span id="VALopen_in"><span class="keyword">val</span> open_in</span> : <code class="type"><a href="Scanf.Scanning.html#TYPEfile_name">file_name</a> -> <a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code></pre><div class="info "> <code class="code"><span class="constructor">Scanning</span>.open_in fname</code> returns a formatted input channel for bufferized reading in text mode from file <code class="code">fname</code>. <p> Note: <code class="code">open_in</code> returns a formatted input channel that efficiently reads characters in large chunks; in contrast, <code class="code">from_channel</code> below returns formatted input channels that must read one character at a time, leading to a much slower scanning rate.<br> <b>Since</b> 3.12.0<br> </div> <pre><span id="VALopen_in_bin"><span class="keyword">val</span> open_in_bin</span> : <code class="type"><a href="Scanf.Scanning.html#TYPEfile_name">file_name</a> -> <a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code></pre><div class="info "> <code class="code"><span class="constructor">Scanning</span>.open_in_bin fname</code> returns a formatted input channel for bufferized reading in binary mode from file <code class="code">fname</code>.<br> <b>Since</b> 3.12.0<br> </div> <pre><span id="VALclose_in"><span class="keyword">val</span> close_in</span> : <code class="type"><a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a> -> unit</code></pre><div class="info "> Closes the <code class="code"><span class="constructor">Pervasives</span>.in_channel</code> associated with the given <code class="code"><span class="constructor">Scanning</span>.in_channel</code> formatted input channel.<br> <b>Since</b> 3.12.0<br> </div> <pre><span id="VALfrom_file"><span class="keyword">val</span> from_file</span> : <code class="type"><a href="Scanf.Scanning.html#TYPEfile_name">file_name</a> -> <a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code></pre><div class="info "> An alias for <code class="code">open_in</code> above.<br> </div> <pre><span id="VALfrom_file_bin"><span class="keyword">val</span> from_file_bin</span> : <code class="type">string -> <a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code></pre><div class="info "> An alias for <code class="code">open_in_bin</code> above.<br> </div> <pre><span id="VALfrom_string"><span class="keyword">val</span> from_string</span> : <code class="type">string -> <a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code></pre><div class="info "> <code class="code"><span class="constructor">Scanning</span>.from_string s</code> returns a formatted input channel which reads from the given string. Reading starts from the first character in the string. The end-of-input condition is set when the end of the string is reached.<br> </div> <pre><span id="VALfrom_function"><span class="keyword">val</span> from_function</span> : <code class="type">(unit -> char) -> <a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code></pre><div class="info "> <code class="code"><span class="constructor">Scanning</span>.from_function f</code> returns a formatted input channel with the given function as its reading method. <p> When scanning needs one more character, the given function is called. <p> When the function has no more character to provide, it <em>must</em> signal an end-of-input condition by raising the exception <code class="code"><span class="constructor">End_of_file</span></code>.<br> </div> <pre><span id="VALfrom_channel"><span class="keyword">val</span> from_channel</span> : <code class="type"><a href="Pervasives.html#TYPEin_channel">in_channel</a> -> <a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code></pre><div class="info "> <code class="code"><span class="constructor">Scanning</span>.from_channel ic</code> returns a formatted input channel which reads from the regular input channel <code class="code">ic</code> argument, starting at the current reading position.<br> </div> <pre><span id="VALend_of_input"><span class="keyword">val</span> end_of_input</span> : <code class="type"><a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a> -> bool</code></pre><div class="info "> <code class="code"><span class="constructor">Scanning</span>.end_of_input ic</code> tests the end-of-input condition of the given formatted input channel.<br> </div> <pre><span id="VALbeginning_of_input"><span class="keyword">val</span> beginning_of_input</span> : <code class="type"><a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a> -> bool</code></pre><div class="info "> <code class="code"><span class="constructor">Scanning</span>.beginning_of_input ic</code> tests the beginning of input condition of the given formatted input channel.<br> </div> <pre><span id="VALname_of_input"><span class="keyword">val</span> name_of_input</span> : <code class="type"><a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a> -> string</code></pre><div class="info "> <code class="code"><span class="constructor">Scanning</span>.name_of_input ic</code> returns the name of the character source for the formatted input channel <code class="code">ic</code>.<br> <b>Since</b> 3.09.0<br> </div> <pre><span id="VALstdib"><span class="keyword">val</span> stdib</span> : <code class="type"><a href="Scanf.Scanning.html#TYPEin_channel">in_channel</a></code></pre><div class="info "> A deprecated alias for <code class="code"><span class="constructor">Scanning</span>.stdin</code>, the scanning buffer reading from <code class="code"><span class="constructor">Pervasives</span>.stdin</code>.<br> </div> </body></html>