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<concept id="GUID-B526BA3A-14E4-53B4-9382-437475A1C8A4" xml:lang="en"><title>Patchable Constants</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>From version 9.3 of Symbian OS, DLLs can export certain constants. These

are referred to as patchable constants, and you can change their values when

the DLLs from which they are exported are incorporated into a ROM image. </p>

<p>This gives you the ability to create a variety of ROM images with constants

of different values without the need to change any source code nor to rebuild

the DLLs. </p>

<p>You change the value of a constant when you build your ROM image by adding

the patchdata keyword into your <filepath>.oby</filepath> file. </p>

<p>See : <xref href="GUID-49397CFD-955A-5DF6-9251-368C44224966.dita">Build tools

reference</xref> and <xref href="GUID-7FF363B0-B05F-5490-8D9C-59061B905381.dita">How

to build ROMs with variants</xref>. </p>

</conbody></concept>