1*cdf0e10cSrcweir<?xml version="1.0" encoding="UTF-8"?> 2*cdf0e10cSrcweir<helpdocument version="1.0"> 3*cdf0e10cSrcweir 4*cdf0e10cSrcweir<!-- 5*cdf0e10cSrcweir*********************************************************************** 6*cdf0e10cSrcweir * 7*cdf0e10cSrcweir * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 8*cdf0e10cSrcweir * 9*cdf0e10cSrcweir * Copyright 2000, 2010 Oracle and/or its affiliates. 10*cdf0e10cSrcweir * 11*cdf0e10cSrcweir * OpenOffice.org - a multi-platform office productivity suite 12*cdf0e10cSrcweir * 13*cdf0e10cSrcweir * This file is part of OpenOffice.org. 14*cdf0e10cSrcweir * 15*cdf0e10cSrcweir * OpenOffice.org is free software: you can redistribute it and/or modify 16*cdf0e10cSrcweir * it under the terms of the GNU Lesser General Public License version 3 17*cdf0e10cSrcweir * only, as published by the Free Software Foundation. 18*cdf0e10cSrcweir * 19*cdf0e10cSrcweir * OpenOffice.org is distributed in the hope that it will be useful, 20*cdf0e10cSrcweir * but WITHOUT ANY WARRANTY; without even the implied warranty of 21*cdf0e10cSrcweir * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22*cdf0e10cSrcweir * GNU Lesser General Public License version 3 for more details 23*cdf0e10cSrcweir * (a copy is included in the LICENSE file that accompanied this code). 24*cdf0e10cSrcweir * 25*cdf0e10cSrcweir * You should have received a copy of the GNU Lesser General Public License 26*cdf0e10cSrcweir * version 3 along with OpenOffice.org. If not, see 27*cdf0e10cSrcweir * <http://www.openoffice.org/license.html> 28*cdf0e10cSrcweir * for a copy of the LGPLv3 License. 29*cdf0e10cSrcweir * 30*cdf0e10cSrcweir ************************************************************************ 31*cdf0e10cSrcweir --> 32*cdf0e10cSrcweir 33*cdf0e10cSrcweir 34*cdf0e10cSrcweir<meta> 35*cdf0e10cSrcweir<topic id="textsbasicshared03102600xml" indexer="include"> 36*cdf0e10cSrcweir<title id="tit" xml-lang="en-US">IsNull Function [Runtime]</title> 37*cdf0e10cSrcweir<filename>/text/sbasic/shared/03102600.xhp</filename> 38*cdf0e10cSrcweir</topic> 39*cdf0e10cSrcweir</meta> 40*cdf0e10cSrcweir<body> 41*cdf0e10cSrcweir<section id="isnull"> 42*cdf0e10cSrcweir<bookmark xml-lang="en-US" branch="index" id="bm_id3155555"><bookmark_value>IsNull function</bookmark_value> 43*cdf0e10cSrcweir<bookmark_value>Null value</bookmark_value> 44*cdf0e10cSrcweir</bookmark> 45*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3155555" xml-lang="en-US" level="1" l10n="U" oldref="1"><link href="text/sbasic/shared/03102600.xhp" name="IsNull Function [Runtime]">IsNull Function [Runtime]</link></paragraph> 46*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3146957" xml-lang="en-US" l10n="U" oldref="2">Tests if a Variant contains the special Null value, indicating that the variable does not contain data.</paragraph> 47*cdf0e10cSrcweir</section> 48*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3150670" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax:</paragraph> 49*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3150984" xml-lang="en-US" l10n="U" oldref="4">IsNull (Var)</paragraph> 50*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3149514" xml-lang="en-US" level="2" l10n="U" oldref="5">Return value:</paragraph> 51*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145609" xml-lang="en-US" l10n="U" oldref="6">Bool</paragraph> 52*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3149669" xml-lang="en-US" level="2" l10n="U" oldref="7">Parameters:</paragraph> 53*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3159414" xml-lang="en-US" l10n="U" oldref="8"> 54*cdf0e10cSrcweir<emph>Var:</emph> Any variable that you want to test. This function returns True if the Variant contains the Null value, or False if the Variant does not contain the Null value.</paragraph> 55*cdf0e10cSrcweir<paragraph role="paragraph" id="par_idN1062A" xml-lang="en-US" l10n="NEW"> 56*cdf0e10cSrcweir<emph>Null</emph> - This value is used for a variant data sub type without valid contents.</paragraph> 57*cdf0e10cSrcweir<embed href="text/sbasic/shared/00000003.xhp#errorcode"/> 58*cdf0e10cSrcweir<embed href="text/sbasic/shared/00000003.xhp#err5"/> 59*cdf0e10cSrcweir<paragraph role="heading" id="hd_id3153381" xml-lang="en-US" level="2" l10n="U" oldref="9">Example:</paragraph> 60*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3154140" xml-lang="en-US" l10n="U" oldref="10">Sub ExampleIsNull</paragraph> 61*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145172" xml-lang="en-US" l10n="U" oldref="11">Dim vVar As Variant</paragraph> 62*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3144760" xml-lang="en-US" l10n="U" oldref="12">msgbox IsNull(vVar)</paragraph> 63*cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3153970" xml-lang="en-US" l10n="U" oldref="13">end sub</paragraph> 64*cdf0e10cSrcweir</body> 65*cdf0e10cSrcweir</helpdocument> 66