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<?xml version="1.0" encoding="UTF-8"?>
<helpdocument version="1.0">
<!--
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
-->
<meta>
<topic id="SF_TextStream" indexer="include" status="PUBLISH">
<title id="tit" xml-lang="en-US">ScriptForge.TextStream service</title>
<filename>/text/sbasic/shared/03/sf_textstream.xhp</filename>
</topic>
</meta>
<body>
<section id="ScriptForge-SF_TextStream">
<bookmark xml-lang="en-US" localize="false" branch="index" id="bm_id50158533078781">
<bookmark_value>TextStream service</bookmark_value>
</bookmark>
</section>
<section id="abstract">
<h1 id="bm_id351585330787295" xml-lang="en-US"><variable id="TextStreamService"><link href="text/sbasic/shared/03/sf_textstream.xhp" name="TextStream service"><literal>ScriptForge</literal>.<literal>TextStream</literal> service</link></variable></h1>
<paragraph role="paragraph" id="par_id511585330787205" xml-lang="en-US">The <literal>TextStream</literal> service is used to sequentially read from and write to files opened or created using the <literal>ScriptForge.FileSystem</literal> service.</paragraph>
<paragraph role="paragraph" id="par_id41613596903894" xml-lang="en-US">The methods <literal>OpenTextFile</literal> and <literal>CreateTextFile</literal> from the <literal>FileSystem</literal> service return an instance of the <literal>TextStream</literal> service.</paragraph>
</section>
<paragraph role="paragraph" id="par_id161585330787262" xml-lang="en-US">Line delimiters may be specified by the user. In input operations CR, LF or CR+LF are supported. In output operations, the default line delimiter is the one used by the operating system.</paragraph>
<paragraph role="paragraph" id="par_id831613598137669" xml-lang="en-US">The line delimiter for the operating system where the macro is being executed can be accessed using the <literal>SF_String.sfNEWLINE</literal> property.</paragraph>
<note id="par_id851613597445432">All operations needed to read from or write to a file (open, read/write and close) are presumed to happen during the same macro run.</note>
<h2 id="hd_id83158533078741" xml-lang="en-US">Service instantiation</h2>
<paragraph role="paragraph" id="par_id351613598192725" xml-lang="en-US">The code snippet below uses the <literal>OpenTextFile</literal> method to create an instance of the <literal>TextStream</literal> Service.</paragraph>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id77158533078783">GlobalScope.BasicLibraries.LoadLibrary("ScriptForge")</paragraph>
<paragraph role="bascode" localize="false" id="bas_id971585330787275">Dim FSO As Variant</paragraph>
<paragraph role="bascode" localize="false" id="bas_id11585330787585">FSO = CreateScriptService("FileSystem")</paragraph>
<paragraph role="bascode" localize="false" id="bas_id891585330787374">Set myFile = FSO.OpenTextFile("C:\Temp\ThisFile.txt", FSO.ForReading)</paragraph>
</bascode>
<paragraph role="paragraph" id="par_id371585330787197" xml-lang="en-US">The file must be closed with the <literal>CloseFile</literal> method after all read or write operations have been executed:</paragraph>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id91613599192241">myFile.CloseFile()</paragraph>
</bascode>
<paragraph role="paragraph" id="par_id891582733781994" xml-lang="en-US">Optionally, the resources used by the <literal>TextStream</literal> instance can be released using the <literal>Dispose</literal> method:</paragraph>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id761613599333614">Set myFile = myFile.Dispose()</paragraph>
</bascode>
<note id="par_id121612917368946">The methods in the <literal>TextStream</literal> service are mostly based on the <link href="https://api.libreoffice.org/docs/idl/ref/interfacecom_1_1sun_1_1star_1_1io_1_1XTextInputStream.html" name="XTextInputStream API"><literal>XTextInputStream</literal></link> and <link href="https://api.libreoffice.org/docs/idl/ref/interfacecom_1_1sun_1_1star_1_1io_1_1XTextOutputStream.html" name="XTextOutputStream API"><literal>XTextOutputStream</literal></link> UNO interfaces.</note>
<h2 id="hd_id941585330787948" xml-lang="en-US">Properties</h2>
<bookmark xml-lang="en-US" branch="index" id="bm_id1001613600572485" localize="false">
<bookmark_value>TextStream service;AtEndOfStream</bookmark_value>
<bookmark_value>TextStream service;Encoding</bookmark_value>
<bookmark_value>TextStream service;FileName</bookmark_value>
<bookmark_value>TextStream service;IOMode</bookmark_value>
<bookmark_value>TextStream service;Line</bookmark_value>
<bookmark_value>TextStream service;NewLine</bookmark_value>
</bookmark>
<table id="tab_id81585330787547">
<tablerow>
<tablecell>
<paragraph id="par_id631585330787267" role="tablehead" xml-lang="en-US">Name</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id401585330787370" role="tablehead" xml-lang="en-US">Readonly</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id581585330787700" role="tablehead" xml-lang="en-US">Type</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id551585330787608" role="tablehead" xml-lang="en-US">Description</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id941585330787832" role="tablecontent" xml-lang="en-US" localize="false">AtEndOfStream</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id181585330787752" role="tablecontent" xml-lang="en-US">Yes</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id471585330787948" role="tablecontent" xml-lang="en-US" localize="false">Boolean</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id901585330787680" role="tablecontent" xml-lang="en-US">Used in read mode. A <literal>True</literal> value indicates that the end of the file has been reached. A test using this property should precede calls to the <literal>ReadLine</literal> method.</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id501585330787895" role="tablecontent" xml-lang="en-US" localize="false">Encoding</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id561585330787568" role="tablecontent" xml-lang="en-US">Yes</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id731585330787673" role="tablecontent" xml-lang="en-US" localize="false">String</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id741585330787777" role="tablecontent" xml-lang="en-US">The character set to be used. The default encoding is "UTF-8".</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id361585330787241" role="tablecontent" xml-lang="en-US" localize="false">FileName</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id641585330787207" role="tablecontent" xml-lang="en-US">Yes</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id9158533078741" role="tablecontent" xml-lang="en-US" localize="false">String</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id281585330787614" role="tablecontent" xml-lang="en-US">Returns the name of the current file either in URL format or in the native operating system's format, depending on the current value of the <literal>FileNaming</literal> property of the <literal>FileSystem</literal> service.</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id451585330787745" role="tablecontent" xml-lang="en-US" localize="false">IOMode</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id111585330787410" role="tablecontent" xml-lang="en-US">Yes</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id981585330787716" role="tablecontent" xml-lang="en-US" localize="false">String</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id861585330787417" role="tablecontent" xml-lang="en-US">Indicates the input/output mode. Possible values are "READ", "WRITE" or "APPEND".</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id721585330787688" role="tablecontent" xml-lang="en-US" localize="false">Line</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id87158533078795" role="tablecontent" xml-lang="en-US">Yes</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id601585330787171" role="tablecontent" xml-lang="en-US" localize="false">Long</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id561585330787741" role="tablecontent" xml-lang="en-US">Returns the number of lines read or written so far.</paragraph>
</tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id12158533078767" role="tablecontent" xml-lang="en-US" localize="false">NewLine</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id531585330787157" role="tablecontent" xml-lang="en-US">No</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id9415853307876" role="tablecontent" xml-lang="en-US" localize="false">String</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id691585330787279" role="tablecontent" xml-lang="en-US">Sets or returns the current delimiter to be inserted between two successive written lines. The default value is the native line delimiter in the current operating system.</paragraph>
</tablecell>
</tablerow>
</table>
<note id="par_id141613001281573">To learn more about the names of character sets, visit <link href="https://www.iana.org/assignments/character-sets/character-sets.xhtml" name="Character Sets">IANA's Character Set</link> page. Beware that %PRODUCTNAME does not implement all existing character sets.</note>
<table id="tab_id501611613601554">
<tablerow>
<tablecell colspan="3"><paragraph id="par_id891611613601554" role="tablehead">List of Methods in the TextStream Service</paragraph></tablecell>
</tablerow>
<tablerow>
<tablecell>
<paragraph id="par_id891611613601556" role="tablecontent" localize="false">
<link href="text/sbasic/shared/03/sf_textstream.xhp#CloseFile" name="CloseFile method">CloseFile</link><br/>
<link href="text/sbasic/shared/03/sf_textstream.xhp#ReadAll" name="ReadAll method">ReadAll</link><br/>
</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id541611613601554" role="tablecontent" localize="false">
<link href="text/sbasic/shared/03/sf_textstream.xhp#ReadLine" name="ReadLine method">ReadLine</link><br/>
<link href="text/sbasic/shared/03/sf_textstream.xhp#SkipLine" name="SkipLine method">SkipLine</link><br/>
</paragraph>
</tablecell>
<tablecell>
<paragraph id="par_id701611613601554" role="tablecontent" localize="false">
<link href="text/sbasic/shared/03/sf_textstream.xhp#WriteBlankLines" name="WriteBlankLines method">WriteBlankLines</link><br/>
<link href="text/sbasic/shared/03/sf_textstream.xhp#WriteLine" name="WriteLine method">WriteLine</link><br/>
</paragraph>
</tablecell>
</tablerow>
</table>
<section id="CloseFile">
<comment> CloseFile -------------------------------------------------------------------------------------------------------------------------- </comment>
<bookmark xml-lang="en-US" localize="false" branch="index" id="bm_id21585330787288">
<bookmark_value>TextStream service;CloseFile</bookmark_value>
</bookmark>
<h2 id="hd_id901585330787252" localize="false">CloseFile</h2>
<paragraph role="paragraph" id="par_id421585330787675">Closes the current input or output stream and empties the output buffer if relevant. Returns <literal>True</literal> if the file was successfully closed.</paragraph>
<h3 id="hd_id751585330787577" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functsyntax"/></h3>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id131585330787787">myFile.CloseFile() As Boolean</paragraph>
</bascode>
</section>
<section id="ReadAll">
<comment> ReadAll -------------------------------------------------------------------------------------------------------------------------- </comment>
<bookmark xml-lang="en-US" localize="false" branch="index" id="bm_id311585330787690">
<bookmark_value>TextStream service;ReadAll</bookmark_value>
</bookmark>
<h2 id="hd_id311585330787335" localize="false">ReadAll</h2>
<paragraph role="paragraph" id="par_id65158533078799">Returns all the remaining lines in the text stream as a single string. Line breaks are not removed.</paragraph>
<paragraph role="paragraph" id="par_id71613600347125">The resulting string can be split in lines either by using the <literal>Split</literal> built-in Basic function if the line delimiter is known, or with the <literal>SF_String.SplitLines</literal> method.</paragraph>
<paragraph role="paragraph" id="par_id91585330787373" xml-lang="en-US">For large files, using the <literal>ReadAll</literal> method wastes memory resources. In such cases it is recommended to read the file line by line using the <literal>ReadLine</literal> method.</paragraph>
<h3 id="hd_id991585330787163" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functsyntax"/></h3>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id881585330787244">myFile.ReadAll() As String</paragraph>
</bascode>
<h3 id="hd_id971585266787755" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functexample"/></h3>
<paragraph role="paragraph" id="par_id921613595637851">Consider the text file "Students.txt" with the following contents (a name in each line):</paragraph>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id921613595638140">Herbie Peggy</paragraph>
<paragraph role="bascode" localize="false" id="bas_id61613595639028">Hardy Jarrett</paragraph>
<paragraph role="bascode" localize="false" id="bas_id711613595639379">Edith Lorelle</paragraph>
<paragraph role="bascode" localize="false" id="bas_id331613595639605">Roderick Rosamund</paragraph>
<paragraph role="bascode" localize="false" id="bas_id641613595639909">Placid Everette</paragraph>
</bascode>
<paragraph role="paragraph" id="par_id391613596019750">The example below uses the <literal>ReadAll</literal> and <literal>SplitLines</literal> methods to read the contents of the file into an array of strings:</paragraph>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id21613595640293">Sub ReadFile_Example</paragraph>
<paragraph role="bascode" id="bas_id251613595640550"> 'Loads the FileSystem service</paragraph>
<paragraph role="bascode" localize="false" id="bas_id931613595640789"> Dim FSO : FSO = CreateScriptService("FileSystem")</paragraph>
<paragraph role="bascode" id="bas_id181613595641087"> 'Opens the text file with the names to be read</paragraph>
<paragraph role="bascode" localize="false" id="bas_id291613595641480"> Dim inputFile as Object</paragraph>
<paragraph role="bascode" localize="false" id="bas_id651613595641754"> Set inputFile = FSO.OpenTextFile("~/Documents/Students.txt")</paragraph>
<paragraph role="bascode" localize="false" id="bas_id711613595642109"> 'Reads all the contents in the input file as a single string</paragraph>
<paragraph role="bascode" localize="false" id="bas_id81613595642474"> Dim allData as String</paragraph>
<paragraph role="bascode" localize="false" id="bas_id191613595642766"> allData = inputFile.ReadAll()</paragraph>
<paragraph role="bascode" localize="false" id="bas_id961613595643093"> 'Splits the string into an array</paragraph>
<paragraph role="bascode" localize="false" id="bas_id51613595643398"> Dim arrNames as Variant</paragraph>
<paragraph role="bascode" localize="false" id="bas_id151613595643675"> arrNames = SF_String.SplitLines(allData)</paragraph>
<paragraph role="bascode" localize="false" id="bas_id211613595928948"> ' (...)</paragraph>
<paragraph role="bascode" localize="false" id="bas_id31613600104976"> inputFile.CloseFile()</paragraph>
<paragraph role="bascode" localize="false" id="bas_id21613595645255">End Sub</paragraph>
</bascode>
</section>
<section id="ReadLine">
<comment> ReadLine -------------------------------------------------------------------------------------------------------------------------- </comment>
<bookmark xml-lang="en-US" localize="false" branch="index" id="bm_id161585330787462">
<bookmark_value>TextStream service;ReadLine</bookmark_value>
</bookmark>
<h2 id="hd_id111585330787998" localize="false">ReadLine</h2>
<paragraph role="paragraph" id="par_id871585330787885">Returns the next line in the text stream as a string. Line breaks are removed from the returned string.</paragraph>
<paragraph role="paragraph" id="par_id431613600221626">The <literal>AtEndOfStream</literal> test should precede the <literal>ReadLine</literal> method like in the example below.</paragraph>
<paragraph role="paragraph" id="par_id171585330787774" xml-lang="en-US">An error will be raised if the <literal>AtEndOfStream</literal> was reached during the previous <literal>ReadLine</literal> or <literal>SkipLine</literal> method call.</paragraph>
<h3 id="hd_id381585330787934" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functsyntax"/></h3>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id941585330787658">myFile.ReadLine() As String</paragraph>
</bascode>
<h3 id="hd_id971585330787755" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functexample"/></h3>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id321585330787499">Dim sLine As String</paragraph>
<paragraph role="bascode" localize="false" id="bas_id791585330787376">Do While Not myFile.AtEndOfStream</paragraph>
<paragraph role="bascode" localize="false" id="bas_id461585330787206"> sLine = myFile.ReadLine()</paragraph>
<paragraph role="bascode" localize="false" id="bas_id521585330787673"> ' (...)</paragraph>
<paragraph role="bascode" localize="false" id="bas_id715853307876">Loop</paragraph>
</bascode>
</section>
<section id="SkipLine">
<comment> SkipLine -------------------------------------------------------------------------------------------------------------------------- </comment>
<bookmark xml-lang="en-US" localize="false" branch="index" id="bm_id381585330787551">
<bookmark_value>TextStream service;SkipLine</bookmark_value>
</bookmark>
<h2 id="hd_id241585330787168" localize="false">SkipLine</h2>
<paragraph role="paragraph" id="par_id11585330787847">Skips the next line in the input stream when reading a <literal>TextStream</literal> file.</paragraph>
<paragraph role="paragraph" id="par_id441613600704766">This method can result in <literal>AtEndOfStream</literal> being set to <literal>True</literal>.</paragraph>
<h3 id="hd_id431585330787708" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functsyntax"/></h3>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id661585330787443">myFile.SkipLine()</paragraph>
</bascode>
</section>
<section id="WriteBlankLines">
<comment> WriteBlankLines -------------------------------------------------------------------------------------------------------------------------- </comment>
<bookmark xml-lang="en-US" localize="false" branch="index" id="bm_id61585330787548">
<bookmark_value>TextStream service;WriteBlankLines</bookmark_value>
</bookmark>
<h2 id="hd_id241585330787109" localize="false">WriteBlankLines</h2>
<paragraph role="paragraph" id="par_id141585330787657">Writes a specified number of empty lines to the output stream.</paragraph>
<h3 id="hd_id731585330787560" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functsyntax"/></h3>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id531585330787648">myFile.WriteBlankLines(Lines As Long)</paragraph>
</bascode>
<h3 id="hd_id391585330787227" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functparameters"/></h3>
<paragraph role="paragraph" id="par_id291585330787357"><emph>Lines</emph>: The number of empty lines to write.</paragraph>
</section>
<section id="WriteLine">
<comment> WriteLine -------------------------------------------------------------------------------------------------------------------------- </comment>
<bookmark xml-lang="en-US" localize="false" branch="index" id="bm_id371585330787255">
<bookmark_value>TextStream service;WriteLine</bookmark_value>
</bookmark>
<h2 id="hd_id611585330787877" localize="false">WriteLine</h2>
<paragraph role="paragraph" id="par_id101585330787215">Writes the given string to the output stream as a single line.</paragraph>
<paragraph role="paragraph" id="par_id421613601002074">The character defined in the <literal>NewLine</literal> property is used as the line delimiter.</paragraph>
<h3 id="hd_id861585330787574" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functsyntax"/></h3>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id8158533078735">myFile.WriteLine(Line As String)</paragraph>
</bascode>
<h3 id="hd_id191585330787562" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functparameters"/></h3>
<paragraph role="paragraph" id="par_id491585330787650"><emph>Line</emph>: The line to write, may be empty.</paragraph>
<h3 id="hd_id971585330145755" localize="false"><embedvar href="text/sbasic/shared/00000003.xhp#functexample"/></h3>
<bascode>
<paragraph role="bascode" localize="false" id="bas_id171613321461620">Sub SquaredValuesFile(lastValue as Integer)</paragraph>
<paragraph role="bascode" id="bas_id21613321528612"> 'Instantiates the FileSystem Service</paragraph>
<paragraph role="bascode" localize="false" id="bas_id711613321529004"> Dim FSO as Variant : FSO = CreateScriptService("FileSystem")</paragraph>
<paragraph role="bascode" id="bas_id191613321529277"> 'Creates a text file</paragraph>
<paragraph role="bascode" localize="false" id="bas_id861613321529684"> Dim myFile as Variant : myFile = FSO.CreateTextFile("~/Documents/squares.csv")</paragraph>
<paragraph role="bascode" id="bas_id641613321530181"> 'Writes the Value and Value squared, separated by ";"</paragraph>
<paragraph role="bascode" localize="false" id="bas_id331613321530548"> Dim value as Integer</paragraph>
<paragraph role="bascode" id="bas_id141613321530960"> myFile.WriteLine("Value;Value Squared")</paragraph>
<paragraph role="bascode" localize="false" id="bas_id891613321531342"> For value = 1 To lastValue</paragraph>
<paragraph role="bascode" localize="false" id="bas_id951613321531798"> myFile.WriteLine(value & ";" & value ^ 2)</paragraph>
<paragraph role="bascode" localize="false" id="bas_id621613321532215"> Next value</paragraph>
<paragraph role="bascode" id="bas_id881613321532598"> 'Closes the file and free resources</paragraph>
<paragraph role="bascode" localize="false" id="bas_id671613321532919"> myFile.CloseFile()</paragraph>
<paragraph role="bascode" localize="false" id="bas_id51613321533150"> myFile.Dispose()</paragraph>
<paragraph role="bascode" localize="false" id="bas_id861613321645821">End Sub</paragraph>
</bascode>
</section>
<embed href="text/sbasic/shared/03/lib_ScriptForge.xhp#SF_InternalUse"/>
<section id="relatedtopics">
<embed href="text/sbasic/shared/03/sf_filesystem.xhp#FileSystemService"/>
<paragraph role="paragraph" id="par_id301613075694148"><link href="text/sbasic/shared/03160000.xhp" name="Input function">Input Function</link></paragraph>
<paragraph role="paragraph" id="par_id271612398715438"><link href="text/sbasic/shared/03020103.xhp" name="Open statement">Open Statement</link></paragraph>
</section>
</body>
</helpdocument>
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