helpcontent2/source/text/sbasic/shared/03102600.xhp

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  38 <topic id="textsbasicshared03102600xml" indexer="include">
  39 <title id="tit" xml-lang="en-US">IsNull Function [Runtime]</title>
  40 <filename>/text/sbasic/shared/03102600.xhp</filename>
  41 </topic>
  42 </meta>
  43 <body>
  44 <section id="isnull">
  45 <bookmark xml-lang="en-US" branch="index" id="bm_id3155555"><bookmark_value>IsNull function</bookmark_value>
  46 <bookmark_value>Null value</bookmark_value>
  47 </bookmark>
  48 <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>
  49 <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>
  50 </section>
  51 <paragraph role="heading" id="hd_id3150670" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax:</paragraph>
  52 <paragraph role="paragraph" id="par_id3150984" xml-lang="en-US" l10n="U" oldref="4">IsNull (Var)</paragraph>
  53 <paragraph role="heading" id="hd_id3149514" xml-lang="en-US" level="2" l10n="U" oldref="5">Return value:</paragraph>
  54 <paragraph role="paragraph" id="par_id3145609" xml-lang="en-US" l10n="U" oldref="6">Bool</paragraph>
  55 <paragraph role="heading" id="hd_id3149669" xml-lang="en-US" level="2" l10n="U" oldref="7">Parameters:</paragraph>
  56 <paragraph role="paragraph" id="par_id3159414" xml-lang="en-US" l10n="U" oldref="8">
  57 <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>
  58 <paragraph role="paragraph" id="par_idN1062A" xml-lang="en-US" l10n="NEW">
  59 <emph>Null</emph> - This value is used for a variant data sub type without valid contents.</paragraph>
  60 <embed href="text/sbasic/shared/00000003.xhp#errorcode"/>
  61 <embed href="text/sbasic/shared/00000003.xhp#err5"/>
  62 <paragraph role="heading" id="hd_id3153381" xml-lang="en-US" level="2" l10n="U" oldref="9">Example:</paragraph>
  63 <paragraph role="paragraph" id="par_id3154140" xml-lang="en-US" l10n="U" oldref="10">Sub ExampleIsNull</paragraph>
  64 <paragraph role="paragraph" id="par_id3145172" xml-lang="en-US" l10n="U" oldref="11">Dim vVar As Variant</paragraph>
  65 <paragraph role="paragraph" id="par_id3144760" xml-lang="en-US" l10n="U" oldref="12">msgbox IsNull(vVar)</paragraph>
  66 <paragraph role="paragraph" id="par_id3153970" xml-lang="en-US" l10n="U" oldref="13">end sub</paragraph>
  67 </body>
  68 </helpdocument>