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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="PetscOptionsGetString"><H1>PetscOptionsGetString</H1></A>
Gets the string value for a particular option in the database.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsys.h"
PetscErrorCode PetscOptionsGetString(const char pre[],const char name[],char string[],size_t len,PetscBool *set)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pre </B></TD><TD>- string to prepend to name or NULL
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>name </B></TD><TD>- the option one is seeking
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>len </B></TD><TD>- maximum length of the string including null termination
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>string </B></TD><TD>- location to copy string
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>set </B></TD><TD>- <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> if found, else <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A>
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Fortran Note</FONT></H3>
The Fortran interface is slightly different from the C/C++
interface (len is not used). Sample usage in Fortran follows
<PRE>
character *20 string
integer flg, ierr
call <A HREF="../Sys/PetscOptionsGetString.html#PetscOptionsGetString">PetscOptionsGetString</A>(NULL_CHARACTER,'-s',string,flg,ierr)
</PRE>
<P>
Notes: if the option is given but no string is provided then an empty string is returned and set is given the value of <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A>
<P>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
Even if the user provided no string (for example -optionname -someotheroption) the flag is set to <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> (and the string is fulled with nulls).
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscOptionsGetInt.html#PetscOptionsGetInt">PetscOptionsGetInt</A>(), <A HREF="../Sys/PetscOptionsGetReal.html#PetscOptionsGetReal">PetscOptionsGetReal</A>(),
<BR><A HREF="../Sys/PetscOptionsHasName.html#PetscOptionsHasName">PetscOptionsHasName</A>(), <A HREF="../Sys/PetscOptionsGetIntArray.html#PetscOptionsGetIntArray">PetscOptionsGetIntArray</A>(), <A HREF="../Sys/PetscOptionsGetRealArray.html#PetscOptionsGetRealArray">PetscOptionsGetRealArray</A>(), <A HREF="../Sys/PetscOptionsBool.html#PetscOptionsBool">PetscOptionsBool</A>(),
<A HREF="../Sys/PetscOptionsName.html#PetscOptionsName">PetscOptionsName</A>(), <A HREF="../Sys/PetscOptionsBegin.html#PetscOptionsBegin">PetscOptionsBegin</A>(), <A HREF="../Sys/PetscOptionsEnd.html#PetscOptionsEnd">PetscOptionsEnd</A>(), <A HREF="../Sys/PetscOptionsHead.html#PetscOptionsHead">PetscOptionsHead</A>(),
<A HREF="../Sys/PetscOptionsStringArray.html#PetscOptionsStringArray">PetscOptionsStringArray</A>(),<A HREF="../Sys/PetscOptionsRealArray.html#PetscOptionsRealArray">PetscOptionsRealArray</A>(), <A HREF="../Sys/PetscOptionsScalar.html#PetscOptionsScalar">PetscOptionsScalar</A>(),
<A HREF="../Sys/PetscOptionsBoolGroupBegin.html#PetscOptionsBoolGroupBegin">PetscOptionsBoolGroupBegin</A>(), <A HREF="../Sys/PetscOptionsBoolGroup.html#PetscOptionsBoolGroup">PetscOptionsBoolGroup</A>(), <A HREF="../Sys/PetscOptionsBoolGroupEnd.html#PetscOptionsBoolGroupEnd">PetscOptionsBoolGroupEnd</A>(),
<A HREF="../Sys/PetscOptionsList.html#PetscOptionsList">PetscOptionsList</A>(), <A HREF="../Sys/PetscOptionsEList.html#PetscOptionsEList">PetscOptionsEList</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/objects/options.c.html#PetscOptionsGetString">src/sys/objects/options.c</A>
<BR><A HREF="./index.html">Index of all Sys routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/sys/examples/tutorials/ex5.c.html">src/sys/examples/tutorials/ex5.c.html</A><BR>
<A HREF="../../../src/sys/examples/tutorials/ex9.c.html">src/sys/examples/tutorials/ex9.c.html</A><BR>
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