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Extensible Markup Language  |  2002-01-24  |  1.5 KB  |  28 lines
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <html><head><title>IsNull Function [Runtime]</title><meta name="filename" content="text/sbasic/common/03102600"/><meta name="language" content="en-US"/><help:css-file-link xmlns:help="http://openoffice.org/2000/help"/><!--The CSS style header method for setting styles--><style type="text/css">
  3.  
  4.         p.P1{
  5.                 }
  6.         p.P2{
  7.                 }
  8.         span.T1{
  9.                 font-weight:bold;}
  10.         </style></head><body>
  11.   
  12.   
  13.   <help:to-be-embedded Eid="isnull" xmlns:help="http://openoffice.org/2000/help">
  14.   <p class="Head1"><help:link Id="66431">IsNull Function [Runtime]</help:link></p>
  15.   <p class="Paragraph">Tests whether a Variant contains the special Null value, indicating that the variable contains no data.</p>
  16.   </help:to-be-embedded>
  17.   <p class="Paragraph"><span class="T1">Syntax</span>:</p>
  18.   <p class="Paragraph">IsNull (Var) <help:key-word value="IsNull" tag="kw66431_1" xmlns:help="http://openoffice.org/2000/help"/></p>
  19.   <p class="Paragraph"><span class="T1">Return value</span>:</p>
  20.   <p class="Paragraph">Bool</p>
  21.   <p class="Paragraph"><span class="T1">Parameter</span>:</p>
  22.   <p class="Paragraph">Var: Any variable to be tested. This function returns True if the Variant contains the Null value; otherwise, it returns False.</p>
  23.   <p class="P2">Example:</p>
  24.   <p class="PropText">Sub ExampleIsNull</p>
  25.   <p class="PropText">Dim vVar As Variant</p>
  26.   <p class="PropText">msgbox IsNull(vVar)</p>
  27.   <p class="PropText">end sub</p>
  28.  </body></html>