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<HTML><HEAD><TITLE>Xlib Programming Manual: XGetDefault</TITLE></HEAD><BODY><H1 ALIGN=center>XGetDefault</H1><H2>Syntax</H2><!.IN "XGetDefault" "" "@DEF@"><CODE><PRE>char *XGetDefault(<I>display</I>, <I>program</I>, <I>option</I>) <A HREF="../../display/opening.html#Display">Display</A> *<I>display</I>; char *<I>program</I>; char *<I>option</I>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <P>display</P><TD> Specifies the connection to the X server.<TR><TD> <P>program</P><TD> Specifies the program name for the Xlib defaults (usually argv[0] of the main program).<TR><TD> <P>option</P><TD> Specifies the option name.</TABLE><H2>Description</H2>The<B>XGetDefault()</B>function returns the value of the resource <I>prog</I>.<I>option</I>,where <I>prog</I> is the program argument with the directory prefix removedand <I>option</I> must be a single component.Note that multilevel resources cannot be used with<B>XGetDefault()</B>.The class "Program.Name" is always used for the resource lookup.If the specified option name does not exist for this program,<B>XGetDefault()</B>returns NULL.The strings returned by<B>XGetDefault()</B>are owned by Xlib and should not be modified or freed by the client.<P>If a database has been set with <B><A HREF="../../resource-manager/XrmSetDatabase.html">XrmSetDatabase()</A></B>, that database is used for the lookup.Otherwise, a database is createdand is set in the display (as if by calling <B><A HREF="../../resource-manager/XrmSetDatabase.html">XrmSetDatabase()</A></B>).The database is created in the current locale.To create a database,<B>XGetDefault()</B>uses resources from the RESOURCE_MANAGER property on the rootwindow of screen zero.If no such property exists,a resource file in the user's home directory is used.On a POSIX-conformant system, this file is<B>"$HOME/.Xdefaults"</B>.<!.IN "Files" "$HOME/.Xdefaults">After loading these defaults,<B>XGetDefault()</B>merges additional defaults specified by the XENVIRONMENTenvironment variable.If XENVIRONMENT is defined,it contains a full path name for the additional resource file.If XENVIRONMENT is not defined,<B>XGetDefault()</B>looks for<B>"$HOME/.Xdefaults-<I>name</I>"</B>,where <I>name</I> specifies the name of the machine on which the applicationis running.<H2>See also</H2>"<A HREF="d.html">Compatibility Functions</A>".<HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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