<div class="content" name="Impact" uuid="5eacbee7-c872-4327-a9ff-87516c3f66df"><p>The IInstallationBehavior::Impact (opnum 9) method retrieves
an enumeration value that describes the impact of the installation or
uninstallation operation on the computer.</p><dl>
<dd>
<div><pre> HRESULT Impact(
   [out, retval] InstallationImpact* retval
 );
</pre></div>
</dd></dl><p><b>retval: </b>An <span><a href="9ed3c4f7-30fc-4b7b-97e1-308b5159822c" data-linktype="relative-path">InstallationImpact (section 2.2.1)</a></span>
instance that indicates the impact of the operation.</p><p><b>Return Values: </b>The method MUST return
information in an <b>HRESULT</b> data structure. The severity bit in the
structure identifies the following conditions:</p><ul><li><p><span><span>  </span></span>If
the severity bit is set to 0, the method completed successfully.</p>
</li><li><p><span><span>  </span></span>If
the severity bit is set to 1, the method failed and encountered a fatal error.</p>
</li></ul><p><b>Exceptions Thrown:</b> No exceptions are thrown beyond
those thrown by the underlying RPC protocol <span><a href="../ms-rpce/290c38b1-92fe-4229-91e6-4fc376610c15" data-linktype="relative-path">[MS-RPCE]</a></span>.</p><p>This method SHOULD return the value of the <b>Impact</b> ADM
element.</p></div>