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<HTML><HEAD><TITLE>Xlib Programming Manual: sXQueryPointer</TITLE></HEAD><BODY><H1 ALIGN=center>XQueryPointer</H1><!.IN "XQueryPointer" "" "@DEF@"><H2>Syntax</H2><CODE><PRE>Bool XQueryPointer(<B>display</B>, <B>w</B>, <B>root_return</B>, <B>child_return</B>, <B>root_x_return</B>, <B>root_y_return</B>, <B>win_x_return</B>, <B>win_y_return</B>, <B>mask_return</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; <A HREF="../window/">Window</A> <B>w</B>; <A HREF="../window/">Window</A> *<B>root_return</B>, *<B>child_return</B>; int *<B>root_x_return</B>, *<B>root_y_return</B>; int *<B>win_x_return</B>, *<B>win_y_return</B>; unsigned int *<B>mask_return</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>w</B><TD> Specifies the window.<TR><TD> <B>root_return</B><TD> Returns the root window that the pointer is in.<TR><TD> <B>child_return</B><TD> Returns the child window that the pointer is located in, if any.<TR><TD> <B>root_x_return</B><BR><B>root_y_return</B><TD> Return the pointer coordinates relative to the root window's origin.<TR><TD> <B>win_x_return</B><BR><B>win_y_return</B><TD> Return the pointer coordinates relative to the specified window.<TR><TD> <B>mask_return</B><TD> Returns the current state of the modifier keys and pointer buttons.</TABLE><H2>Description</H2>The<B>XQueryPointer()</B>function returns the root window the pointer is logically on and the pointercoordinates relative to the root window's origin.If<B>XQueryPointer()</B>returns <B>False</B>, the pointer is not on the same screen as the specified window, and<B>XQueryPointer()</B>returns <B>None</B>to child_return and zero to win_x_return and win_y_return.If <B>XQueryPointer()</B>returns <B>True</B>, the pointer coordinates returned to win_x_return and win_y_returnare relative to the origin of the specified window.In this case, <B>XQueryPointer()</B>returns the child that contains the pointer, if any,or else<B>None</B>to child_return.<P><B>XQueryPointer()</B>returns the current logical state of the keyboard buttons and the modifier keys in mask_return.It sets mask_return to the bitwise inclusive OR of one or moreof the button or modifier key bitmasks to match the current state of the mouse buttons and the modifier keys.<P>Note that the logical state of a device (as seen through Xlib)may lag the physical state if device event processing is frozen(see "<A HREF="../input/pointer-grabbing.html">Pointer Grabbing</A>").<P><B>XQueryPointer()</B>can generate a<B>BadWindow</B>error.<H2>Diagnostics</H2><TABLE><TR><TD><B>BadWindow</B><TD>A value for a Window argument does not name a defined Window.</TABLE><H2>See also</H2><B><A HREF="XGetWindowAttributes.html">XGetWindowAttributes()</A></B>,<B><A HREF="XQueryTree.html">XQueryTree()</A></B>,"<A HREF="translate.html">Translating Screen Coordinates</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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