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CentOS 7.0 - man page for xideleteproperty (centos section 3)

XICHANGEPROPERTY(3)							      XICHANGEPROPERTY(3)

NAME
       XIChangeProperty, XIGetProperty, XIDeleteProperty - change, retrieve or delete a device's
       property.

SYNOPSIS
       #include <X11/extensions/XInput2.h>

       void XIChangeProperty( Display* dpy,
			      int deviceid,
			      Atom property,
			      Atom type,
			      int format,
			      int mode,
			      unsigned char *data,
			      int num_items)

       void XIDeleteProperty( Display *dpy,
			      int deviceid,
			      Atom property)

       Status XIGetProperty( Display *dpy,
			     int deviceid,
			     Atom property,
			     long offset,
			     long length,
			     Bool delete_property,
			     Atom type,
			     Atom *type_return,
			     int *format_return,
			     unsigned long *num_items_return,
			     unsigned long *bytes_after_return,
			     unsigned char **data)

       bytes_after_return
	      Returns the number of bytes remaining to be read in the prop-
	      erty if a partial read was performed.

       data
	      Specifies the property data.

       display
	      Specifies the connection to the X server.

       delete_property
	      Specifies a Boolean value that determines whether the property
	      is to be deleted.

       deviceid
	      The device to list the properties for.

       format
	      Specifies whether the data should be viewed as a list of
	      8-bit, 16-bit, or 32-bit quantities.  Possible values are 8,
	      16, and 32.  This information allows the X server to correctly
	      perform byte-swap operations as necessary. If the
	      format is 16-bit or 32-bit, you must explicitly cast your
	      data pointer to an (unsigned char *) in the call to
	      XIChangeProperty.

       format_return
	      Returns the actual format of the property.

       length
	      Specifies the length in 32-bit multiples of the data to be
	      retrieved.

       offset
	      Specifies the offset in the specified property (in 32-bit
	      quantities) where the data is to be retrieved.

       mode
	      One of XIPropModeAppend, XIPropModePrepend or XIPropModeReplace.

       num_items
	      Number of items in data in the format specified.

       nitems_return
	      Returns the actual number of 8-bit, 16-bit, or 32-bit items
	      stored in data.

       property
	      Specifies the property name.

       type
	      Specifies the type of the property.  The X server does not
	      interpret the type but simply passes it back to an application
	      that later calls XIGetProperty.

       type_return
	      Returns the atom identifier that defines the actual type of
	      the property.

DESCRIPTION
       The XIGetProperty function returns the actual type of the property; the actual format of
       the property; the number of 8-bit, 16-bit, or 32-bit items transferred; the number of
       bytes remaining to be read in the property; and a pointer to the data actually returned.
       XIGetProperty sets the return arguments as follows:

       o   If the specified property does not exist for the specified device, XIGetProperty
	   returns None to actual_type_return and the value zero to actual_format_return and
	   bytes_after_return. The nitems_return argument is empty. In this case, the delete
	   argument is ignored.

       o   If the specified property exists but its type does not match the specified type,
	   XIGetProperty returns the actual property type to actual_type_return, the actual
	   property format (never zero) to actual_format_return, and the property length in bytes
	   (even if the actual_format_return is 16 or 32) to bytes_after_return. It also ignores
	   the delete argument. The nitems_return argument is empty.

       o   If the specified property exists and either you assign XIAnyPropertyType to the
	   req_type argument or the specified type matches the actual property type,
	   XIGetProperty returns the actual property type to actual_type_return and the actual
	   property format (never zero) to actual_format_return. It also returns a value to
	   bytes_after_return and nitems_return, by defining the following values:

	       N = length of the stored property in bytes
	       I = 4 * offset
	       T = N - I
	       L = MINIMUM(T, 4 * length)
	       A = N - (I + L)

       The returned value starts at byte index I in the property (indexing from zero), and its
       length in bytes is L. If the value for long_offset causes L to be negative, a BadValue
       error results. The value of bytes_after_return is A, giving the number of trailing unread
       bytes in the stored property.

       If the returned format is 8, the returned data is represented as a char array. If the
       returned format is 16, the returned data is represented as a uint16_t array and should be
       cast to that type to obtain the ele- ments. If the returned format is 32, the returned
       data is represented as a uint32_t array and should be cast to that type to obtain the
       elements.

       XIGetProperty always allocates one extra byte in prop_return (even if the property is zero
       length) and sets it to zero so that simple properties consisting of characters do not have
       to be copied into yet another string before use.

       If delete is True and bytes_after_return is zero, XIGetProperty deletes the property from
       the window and generates an XIPropertyNotify event on the window.

       The function returns Success if it executes successfully. To free the resulting data, use
       XFree.

       XIGetProperty can generate BadAtom, BadValue, and BadWindow errors.

       The XIChangeProperty function alters the property for the specified device and causes the
       X server to generate a XIPropertyNotify event for that device. XIChangeProperty performs
       the following:

       o   If mode is XIPropModeReplace, XIChangeProperty discards the previous property value
	   and stores the new data.

       o   If mode is XIPropModePrepend or XIPropModeAppend, XIChangeProperty inserts the
	   specified data before the beginning of the existing data or onto the end of the
	   existing data, respectively. The type and format must match the existing property
	   value, or a BadMatch error results. If the property is undefined, it is treated as
	   defined with the correct type and format with zero-length data.

       If the specified format is 8, the property data must be a char array. If the specified
       format is 16, the property data must be a uint16_t array. If the specified format is 32,
       the property data must be a uint32_t array.

       The lifetime of a property is not tied to the storing client. Properties remain until
       explicitly deleted, until the device is removed, or until the server resets. The maximum
       size of a property is server dependent and can vary dynamically depending on the amount of
       memory the server has available. (If there is insufficient space, a BadAlloc error
       results.)

       XIChangeProperty can generate BadAlloc, BadAtom, BadMatch, BadValue, and BadDevice errors.

       The XIDeleteProperty function deletes the specified property only if the property was
       defined on the specified device and causes the X server to generate a XIPropertyNotify
       event for the device unless the property does not exist.

       XIDeleteProperty can generate BadAtom and BadDevice errors.

DIAGNOSTICS
       BadAlloc The server failed to allocate the requested resource or server memory.

       BadAtom A value for an Atom argument does not name a defined Atom.

       BadValue Some numeric value falls outside the range of values accepted by the request.
       Unless a specific range is specified for an argument, the full range defined by the
       argument's type is accepted. Any argument defined as a set of alternatives can generate
       this error.

       BadDevice An invalid device was specified. The device does not exist.

       BadAtom An invalid property was specified. The property does not exist.

BUGS
	   The protocol headers for XI 2.0 did not provide
	   XIAnyPropertyType, XIPropModeReplace, XIPropModePrepend or
	   XIPropModeAppend. Use AnyPropertyType, PropModeReplace,
	   PropModePrepend and PropModeAppend instead, respectively.

SEE ALSO
       XIListProperties(3)

					    03/09/2013			      XICHANGEPROPERTY(3)


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