Xlib â C Language X Interface

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Xlib − C LibraryX11, Release 6.7 DRAFTQLength (display)int XQLength(display)Display *display;displaySpecifies the connection to the X server.Both return the length of the event queue for the connected display. Note that there may be moreevents that have not been read into the queue yet (see XEventsQueued).RootWindow(display, screen_number)Window XRootWindow(display, screen_number)Display *display;int screen_number;displayscreen_numberSpecifies the connection to the X server.Specifies the appropriate screen number on the host server.Both return the root window. These are useful with functions that need a drawable of a particularscreen and for creating top-level windows.ScreenCount (display)int XScreenCount(display)Display *display;displaySpecifies the connection to the X server.Both return the number of available screens.ServerVendor (display)char *XServerVendor (display)Display *display;displaySpecifies the connection to the X server.Both return a pointer to a null-terminated string that provides some identification of the owner ofthe X server implementation. If the data returned by the server is in the Latin Portable CharacterEncoding, then the string is in the Host Portable Character Encoding. Otherwise, the contents ofthe string are implementation-dependent.17
Xlib − C LibraryX11, Release 6.7 DRAFTVendorRelease (display)int XVendorRelease (display)Display *display;displaySpecifies the connection to the X server.Both return a number related to a vendor’s release of the X server.2.2.2. Image Format Functions and MacrosApplications are required to present data to the X server in a format that the server demands. Tohelp simplify applications, most of the work required to convert the data is provided by Xlib (seesections 8.7 and 16.8).The XPixmapFormatValues structure provides an interface to the pixmap format informationthat is returned at the time of a connection setup. It contains:typedef struct {int depth;int bits_per_pixel;int scanline_pad;}XPixmapFormatValues;To obtain the pixmap format information for a given display, use XListPixmapFormats.XPixmapFormatValues *XListPixmapFormats (display, count_return)Display *display;int *count_return;displaycount_returnSpecifies the connection to the X server.Returns the number of pixmap formats that are supported by the display.The XListPixmapFormats function returns an array of XPixmapFormatValues structures thatdescribe the types of Z format images supported by the specified display. Ifinsufficient memoryis available, XListPixmapFormats returns NULL. To free the allocated storage for theXPixmapFormatValues structures, use XFree.The following lists the C language macros, their corresponding function equivalents that are forother language bindings, and what data they both return for the specified server and screen.These are often used by toolkits as well as by simple applications.18
Page 3 and 4: AcknowledgmentsThe design and imple
Page 5 and 6: Release 6Stephen Gildea (X Consorti
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4.2. Translating Screen Coordinates
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10.7. Input Focus Events . . . . .
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13.5.6.1. Input Style . . . . . . .
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Xlib â C Language X Interface