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<HTML><HEAD><TITLE>Xlib Programming Manual: Obtaining Information</TITLE></HEAD><BODY><H1 ALIGN=center>2.2 Obtaining Information about the Display, Image Formats, or Screens</H1><P>The Xlib library provides a number of useful macros and corresponding functions that return data from the <A HREF="opening.html#Display">Display</A> structure.The macros are used for C programming, and their corresponding function equivalents are for other language bindings.This section discusses the:<UL<P><LI><A HREF="display-macros.html">Display macros</A><P><LI><A HREF="image-format-macros.html">Image format macros</A><P><LI><A HREF="screen-information.html">Screen macros</A></UL><P><!.IN "Display" "data structure" >All other members of the <A HREF="opening.html#Display">Display</A> structure (that is, those for which no macros are defined) are private to Xlib and must not be used.Applications must never directly modify or inspect these private members of the <A HREF="opening.html#Display">Display</A> structure.<BLOCKQUOTE><P ALIGN=center>Note<P>The<B><A HREF="image-format-macros.html#DisplayWidth">XDisplayWidth()</A></B>,<B><A HREF="image-format-macros.html#DisplayHeight">XDisplayHeight()</A></B>,<B><A HREF="display-macros.html#DisplayCells">XDisplayCells()</A></B>,<B><A HREF="display-macros.html#DisplayPlanes">XDisplayPlanes()</A></B>,<B><A HREF="image-format-macros.html#DisplayWidthMM">XDisplayWidthMM()</A></B>,and<B><A HREF="image-format-macros.html#DisplayHeightMM">XDisplayHeightMM()</A></B>functions in the next sections are misnamed.These functions really should be named Screen<I>whatever</I> and XScreen<I>whatever</I>, not Display<I>whatever</I> or XDisplay<I>whatever</I>.Our apologies for the resulting confusion.</BLOCKQUOTE><H5 ALIGN=right><I>Next: <A HREF="display-macros.html">Display Macros</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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