1cdf0e10cSrcweir<?xml version="1.0" encoding="UTF-8"?> 2cdf0e10cSrcweir<helpdocument version="1.0"> 3cdf0e10cSrcweir 4*d33d0967SAndrew Rist<!--*********************************************************** 5cdf0e10cSrcweir * 6*d33d0967SAndrew Rist * Licensed to the Apache Software Foundation (ASF) under one 7*d33d0967SAndrew Rist * or more contributor license agreements. See the NOTICE file 8*d33d0967SAndrew Rist * distributed with this work for additional information 9*d33d0967SAndrew Rist * regarding copyright ownership. The ASF licenses this file 10*d33d0967SAndrew Rist * to you under the Apache License, Version 2.0 (the 11*d33d0967SAndrew Rist * "License"); you may not use this file except in compliance 12*d33d0967SAndrew Rist * with the License. You may obtain a copy of the License at 13*d33d0967SAndrew Rist * 14*d33d0967SAndrew Rist * http://www.apache.org/licenses/LICENSE-2.0 15*d33d0967SAndrew Rist * 16*d33d0967SAndrew Rist * Unless required by applicable law or agreed to in writing, 17*d33d0967SAndrew Rist * software distributed under the License is distributed on an 18*d33d0967SAndrew Rist * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 19*d33d0967SAndrew Rist * KIND, either express or implied. See the License for the 20*d33d0967SAndrew Rist * specific language governing permissions and limitations 21*d33d0967SAndrew Rist * under the License. 22*d33d0967SAndrew Rist * 23*d33d0967SAndrew Rist ***********************************************************--> 24*d33d0967SAndrew Rist 25*d33d0967SAndrew Rist 26cdf0e10cSrcweir 27cdf0e10cSrcweir 28cdf0e10cSrcweir<meta> 29cdf0e10cSrcweir<topic id="textsbasicshared03102600xml" indexer="include"> 30cdf0e10cSrcweir<title id="tit" xml-lang="en-US">IsNull Function [Runtime]</title> 31cdf0e10cSrcweir<filename>/text/sbasic/shared/03102600.xhp</filename> 32cdf0e10cSrcweir</topic> 33cdf0e10cSrcweir</meta> 34cdf0e10cSrcweir<body> 35cdf0e10cSrcweir<section id="isnull"> 36cdf0e10cSrcweir<bookmark xml-lang="en-US" branch="index" id="bm_id3155555"><bookmark_value>IsNull function</bookmark_value> 37cdf0e10cSrcweir<bookmark_value>Null value</bookmark_value> 38cdf0e10cSrcweir</bookmark> 39cdf0e10cSrcweir<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> 40cdf0e10cSrcweir<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> 41cdf0e10cSrcweir</section> 42cdf0e10cSrcweir<paragraph role="heading" id="hd_id3150670" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax:</paragraph> 43cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3150984" xml-lang="en-US" l10n="U" oldref="4">IsNull (Var)</paragraph> 44cdf0e10cSrcweir<paragraph role="heading" id="hd_id3149514" xml-lang="en-US" level="2" l10n="U" oldref="5">Return value:</paragraph> 45cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145609" xml-lang="en-US" l10n="U" oldref="6">Bool</paragraph> 46cdf0e10cSrcweir<paragraph role="heading" id="hd_id3149669" xml-lang="en-US" level="2" l10n="U" oldref="7">Parameters:</paragraph> 47cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3159414" xml-lang="en-US" l10n="U" oldref="8"> 48cdf0e10cSrcweir<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> 49cdf0e10cSrcweir<paragraph role="paragraph" id="par_idN1062A" xml-lang="en-US" l10n="NEW"> 50cdf0e10cSrcweir<emph>Null</emph> - This value is used for a variant data sub type without valid contents.</paragraph> 51cdf0e10cSrcweir<embed href="text/sbasic/shared/00000003.xhp#errorcode"/> 52cdf0e10cSrcweir<embed href="text/sbasic/shared/00000003.xhp#err5"/> 53cdf0e10cSrcweir<paragraph role="heading" id="hd_id3153381" xml-lang="en-US" level="2" l10n="U" oldref="9">Example:</paragraph> 54cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3154140" xml-lang="en-US" l10n="U" oldref="10">Sub ExampleIsNull</paragraph> 55cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3145172" xml-lang="en-US" l10n="U" oldref="11">Dim vVar As Variant</paragraph> 56cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3144760" xml-lang="en-US" l10n="U" oldref="12">msgbox IsNull(vVar)</paragraph> 57cdf0e10cSrcweir<paragraph role="paragraph" id="par_id3153970" xml-lang="en-US" l10n="U" oldref="13">end sub</paragraph> 58cdf0e10cSrcweir</body> 59cdf0e10cSrcweir</helpdocument> 60