[FIXME: manual] XICHANGEPROPERTY(3xi)
NAME
XIChangeProperty, XIGetProperty, XIDeleteProperty - change,
retrieve or delete a device's property.SYNOPSIS
cc [ flag... ] file... -lXi [ library... ]
#include
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. [FIXME: source] Last change: 08/04/2010 1 [FIXME: manual] XICHANGEPROPERTY(3xi) format Specifies whether the data should be viewed as a list of8-bit, 16-bit, or 32-bit quantities. Possible values are 8,
16, and 32. This information allows the X server to correctlyperform 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. lengthSpecifies the length in 32-bit multiples of the data to be
retrieved. offsetSpecifies the offset in the specified property (in 32-bit
quantities) where the data is to be retrieved. mode One of PropModeAppend, PropModePrepend or PropModeReplace.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 applicationthat 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 of8-bit, 16-bit, or 32-bit items transferred; the number of
bytes remaining to be read in the property; and a pointer tothe data actually returned. XIGetProperty sets the return
arguments as follows: +o If the specified property does not exist for thespecified device, XIGetProperty returns None to
[FIXME: source] Last change: 08/04/2010 2 [FIXME: manual] XICHANGEPROPERTY(3xi)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 notmatch 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 theactual_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 assignAnyPropertyType 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 * offsetT = 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 thevalue 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 auint32_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. [FIXME: source] Last change: 08/04/2010 3 [FIXME: manual] XICHANGEPROPERTY(3xi) 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 PropModeReplace, XIChangeProperty discards the previous property value and stores the new data. +o If mode is PropModePrepend or PropModeAppend, XChangeProperty 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 withzero-length data.
If the specified format is 8, the property data must be a char array. If the specified format is 16, the property datamust 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. [FIXME: source] Last change: 08/04/2010 4 [FIXME: manual] XICHANGEPROPERTY(3xi) 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 arguments 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.SEE ALSO
XIListProperties(3xi)ATTRIBUTES
See attributes(5) for descriptions of the following attributes: allbox; cw(2.750000i)| cw(2.750000i) lw(2.750000i)|lw(2.750000i). ATTRIBUTE TYPE ATTRIBUTE VALUE
Availability x11/library/libxi InterfaceStability Committed MT-Level See XInitThreads(3X11)
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | x11/library/libxi ||_____________________________|_____________________________|
| Interface Stability | Committed ||_____________________________|_____________________________|
| MT-Level | See XInitThreads(3X11) |
|_____________________________|_____________________________|
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