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<HTML><HEAD><TITLE>Xlib Programming Manual: Creating and Storing Databases</TITLE></HEAD><BODY><H1 ALIGN=center>15.4 Creating and Storing Databases</H1><!.IN "XrmDatabase" "" "@DEF@">A resource database is an opaque type,<B>XrmDatabase</B>.Each database value is stored in an<B>XrmValue</B>structure.This structure consists of a size, an address, and a representation type.The size is specified in bytes.The representation type is a way for you to store data tagged by some application-defined type (for example, the strings ``font'' or ``color'').It has nothing to do with the C data type or with its class. The<B>XrmValue</B> structure is defined as:<P><!.IN "XrmValue" "" "@DEF@"><PRE><CODE>typedef struct { unsigned int size; XPointer addr;} XrmValue, *XrmValuePtr;</PRE></CODE><P>To initialize the resource manager, use<B><A HREF="XrmInitialize.html">XrmInitialize()</A></B>.<P>To retrieve a database from disk, use<B><A HREF="XrmGetFileDatabase.html">XrmGetFileDatabase()</A></B>.<P>To store a copy of a database to disk, use<B><A HREF="XrmPutFileDatabase.html">XrmPutFileDatabase()</A></B>.<P>To obtain a pointer to the screen independent resources of a display, use<B><A HREF="XResourceManagerString.html">XResourceManagerString()</A></B>.<P>To obtain a pointer to the screen-specific resources of a screen, use<B><A HREF="XScreenResourceString.html">XScreenResourceString()</A></B>.<P>To create a database from a string, use<B><A HREF="XrmGetStringDatabase.html">XrmGetStringDatabase()</A></B>.<P>To obtain locale name of a database, use<B><A HREF="XrmLocaleOfDatabase.html">XrmLocaleOfDatabase()</A></B>.<P>To destroy a resource database and free its allocated memory, use<B><A HREF="XrmDestroyDatabase.html">XrmDestroyDatabase()</A></B>.<P>To associate a resource database with a display, use<B><A HREF="XrmSetDatabase.html">XrmSetDatabase()</A></B>.<P>To get the resource database associated with a display, use<B><A HREF="XrmGetDatabase.html">XrmGetDatabase()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="merging-databases.html">Merging Resource Databases</A></I></H5><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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