1*b1cdbd2cSJim Jagielski<?xml version="1.0" encoding="UTF-8"?> 2*b1cdbd2cSJim Jagielski<helpdocument version="1.0"> 3*b1cdbd2cSJim Jagielski 4*b1cdbd2cSJim Jagielski<!--*********************************************************** 5*b1cdbd2cSJim Jagielski * 6*b1cdbd2cSJim Jagielski * Licensed to the Apache Software Foundation (ASF) under one 7*b1cdbd2cSJim Jagielski * or more contributor license agreements. See the NOTICE file 8*b1cdbd2cSJim Jagielski * distributed with this work for additional information 9*b1cdbd2cSJim Jagielski * regarding copyright ownership. The ASF licenses this file 10*b1cdbd2cSJim Jagielski * to you under the Apache License, Version 2.0 (the 11*b1cdbd2cSJim Jagielski * "License"); you may not use this file except in compliance 12*b1cdbd2cSJim Jagielski * with the License. You may obtain a copy of the License at 13*b1cdbd2cSJim Jagielski * 14*b1cdbd2cSJim Jagielski * http://www.apache.org/licenses/LICENSE-2.0 15*b1cdbd2cSJim Jagielski * 16*b1cdbd2cSJim Jagielski * Unless required by applicable law or agreed to in writing, 17*b1cdbd2cSJim Jagielski * software distributed under the License is distributed on an 18*b1cdbd2cSJim Jagielski * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 19*b1cdbd2cSJim Jagielski * KIND, either express or implied. See the License for the 20*b1cdbd2cSJim Jagielski * specific language governing permissions and limitations 21*b1cdbd2cSJim Jagielski * under the License. 22*b1cdbd2cSJim Jagielski * 23*b1cdbd2cSJim Jagielski ***********************************************************--> 24*b1cdbd2cSJim Jagielski 25*b1cdbd2cSJim Jagielski 26*b1cdbd2cSJim Jagielski 27*b1cdbd2cSJim Jagielski 28*b1cdbd2cSJim Jagielski<meta> 29*b1cdbd2cSJim Jagielski<topic id="textsbasicshared03102600xml" indexer="include"> 30*b1cdbd2cSJim Jagielski<title id="tit" xml-lang="en-US">IsNull Function [Runtime]</title> 31*b1cdbd2cSJim Jagielski<filename>/text/sbasic/shared/03102600.xhp</filename> 32*b1cdbd2cSJim Jagielski</topic> 33*b1cdbd2cSJim Jagielski</meta> 34*b1cdbd2cSJim Jagielski<body> 35*b1cdbd2cSJim Jagielski<section id="isnull"> 36*b1cdbd2cSJim Jagielski<bookmark xml-lang="en-US" branch="index" id="bm_id3155555"><bookmark_value>IsNull function</bookmark_value> 37*b1cdbd2cSJim Jagielski<bookmark_value>Null value</bookmark_value> 38*b1cdbd2cSJim Jagielski</bookmark> 39*b1cdbd2cSJim Jagielski<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> 40*b1cdbd2cSJim Jagielski<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> 41*b1cdbd2cSJim Jagielski</section> 42*b1cdbd2cSJim Jagielski<paragraph role="heading" id="hd_id3150670" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax:</paragraph> 43*b1cdbd2cSJim Jagielski<paragraph role="paragraph" id="par_id3150984" xml-lang="en-US" l10n="U" oldref="4">IsNull (Var)</paragraph> 44*b1cdbd2cSJim Jagielski<paragraph role="heading" id="hd_id3149514" xml-lang="en-US" level="2" l10n="U" oldref="5">Return value:</paragraph> 45*b1cdbd2cSJim Jagielski<paragraph role="paragraph" id="par_id3145609" xml-lang="en-US" l10n="U" oldref="6">Bool</paragraph> 46*b1cdbd2cSJim Jagielski<paragraph role="heading" id="hd_id3149669" xml-lang="en-US" level="2" l10n="U" oldref="7">Parameters:</paragraph> 47*b1cdbd2cSJim Jagielski<paragraph role="paragraph" id="par_id3159414" xml-lang="en-US" l10n="U" oldref="8"> 48*b1cdbd2cSJim Jagielski<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> 49*b1cdbd2cSJim Jagielski<paragraph role="paragraph" id="par_idN1062A" xml-lang="en-US" l10n="NEW"> 50*b1cdbd2cSJim Jagielski<emph>Null</emph> - This value is used for a variant data sub type without valid contents.</paragraph> 51*b1cdbd2cSJim Jagielski<embed href="text/sbasic/shared/00000003.xhp#errorcode"/> 52*b1cdbd2cSJim Jagielski<embed href="text/sbasic/shared/00000003.xhp#err5"/> 53*b1cdbd2cSJim Jagielski<paragraph role="heading" id="hd_id3153381" xml-lang="en-US" level="2" l10n="U" oldref="9">Example:</paragraph> 54*b1cdbd2cSJim Jagielski<paragraph role="paragraph" id="par_id3154140" xml-lang="en-US" l10n="U" oldref="10">Sub ExampleIsNull</paragraph> 55*b1cdbd2cSJim Jagielski<paragraph role="paragraph" id="par_id3145172" xml-lang="en-US" l10n="U" oldref="11">Dim vVar As Variant</paragraph> 56*b1cdbd2cSJim Jagielski<paragraph role="paragraph" id="par_id3144760" xml-lang="en-US" l10n="U" oldref="12">msgbox IsNull(vVar)</paragraph> 57*b1cdbd2cSJim Jagielski<paragraph role="paragraph" id="par_id3153970" xml-lang="en-US" l10n="U" oldref="13">end sub</paragraph> 58*b1cdbd2cSJim Jagielski</body> 59*b1cdbd2cSJim Jagielski</helpdocument> 60