libgii(7) GGI libgii(7)NAME
libgii - A flexible library for input handling
DESCRIPTION
LibGII is an input library developed by the GGI Project. Its design philosophy is similar to LibGGI, which deals with graphics output.
LibGII is based on the concept of input streams, which virtualize access to the underlying input drivers. Events from various input devices
are abstracted into easy-to-use structures. LibGII also allows the application to join streams together, receiving input from an arbitrary
combination of devices.
LibGII is a separate component from LibGGI, although LibGGI depends on LibGII for input purposes. (LibGGI's input functions are simply
wrappers for LibGII functions.)
ENVIRONMENT VARIABLES
The following outlines the environment variables, intended for the user, which affect the behaviour of LibGII:
GII_INPUT
The default input source(s) and/or filter(s) to use when giiOpen() is called with a NULL argument. The format is: input:inputargs.
Multiple inputs can be specified by this notation: (i1):(i2) ....
Note: This setting does not affect LibGGI visuals automatically opening inputs. Use the GGI_INPUTx variable instead.
GII_DEBUG
The debug level for LibGII:
o 0 or unset : debug output is off; debugging is off
o 255 : all debug output is on
You may also bitwise 'or' any of the following together:
o 2 : debug core
o 32 : misc debugging output
o 64 : debug dynamic library handling
o 128 : debug event handling
GII_DEBUGSYNC
Turn on synchronous debug output, flushing the output buffers before returning from DPRINT calls.
GII_CONFDIR
Override compiled-in path to global config files (Win32 only, but not Cygwin).
Other environment variables specific to filters and inputs are documented in the corresponding manual page.
SEE ALSO libgii.conf(5), filter-keytrans(7), filter-mouse(7), filter-save(7), filter-tcp(7), input-directx(7), input-linux-kbd(7), input-mouse(7),
input-file(7), input-linux-mouse(7), input-tcp(7), input-linux-evdev(7), input-lk201(7).
libgii-1.0.x 2006-12-30 libgii(7)
Check Out this Related Man Page
giiOpen(3) GGI giiOpen(3)NAME
giiOpen, giiJoinInputs, giiSplitInputs, giiClose - Open, join, split and close inputs
SYNOPSIS
#include <ggi/gii.h>
gii_input_t giiOpen(const char * input, ...);
gii_input_t giiJoinInputs(gii_input_t inp, gii_input_t inp2);
int giiSplitInputs(gii_input_t inp, gii_input_t *newhand,
uint32_t origin, uint32_t flags);
int giiClose(gii_input_t inp);
DESCRIPTION
giiOpen opens an input. This function is given the name of an input driver to load. Passing NULL here results in an auto-select mechanism,
which currently means examining the contents of GII_INPUT.
The optional arguments are a NULL-terminated list of pointers, which are used to give additional information to the targets. Currently
only the first pointer is specified: void * argptr, a pointer to a library-specific struct. It is used to pass parameters that are not eas-
ily transferable in textual form.
Parameters which can be represented in text format are usually transfered in the input parameter, in the format: library_name:arguments
giiJoinInputs joins two inputs into one. From a programmers' point of view, this closes both inp and inp2 and opens an new input that com-
bines both inputs into one. That is, after giiJoinInputs has completed, there is no need to giiClose inp and inp2 any more. When cleaning
up, you need to close the returned input instead. See the example for details. However the inputs are not actually closed or reopened
internally. That is, you will not get any startup-events or similar the driver generates, though pending events of both old inputs are
transferred to the newly created input.
giiSplitInputs splits one of the inputs from a group of joined inputs and returns the handle. The parameter origin can be used to choose
which input to detach (use GGI_EV_ORIGIN_NONE to match any input.) The detached handle is returned in newhand. Note, though, that if the
detached input is the same one given in inp, then the handle returned in newhand will be that of the rest of the joined inputs instead.
You can tell whether this happened by checking the return code. Events queued in the joined input for the newly split input are not trans-
ferred automatically. You must drain them out yourself. The parameter flags is reserved for future use and should be set to 0.
giiClose releases and destroys an open input and its associated internal control structures. This will put back input streams to their
default modes, etc.
Important: If you want to handle input while also using LibGGI, using LibGII functions such as giiOpen is almost certainly not what
you want. Use LibGGI functions such as ggiEventRead(3) with the LibGGI visual instead.
RETURN VALUE
giiOpen and giiJoinInputs return the opened or joined input, or NULL for error. The gii_input_t type is opaque to the programmer and can
only be used through GII functions.
giiClose returns GGI_OK (== 0) on success, otherwise an gii-error(3) code.
giiSplitInputs returns 0 for normal success, or 1 if the input which was split off was the same as the one passed in inp (in which case,
newhand may contain a handle to a joined set of visuals.) Otherwise, it returns an gii-error(3) code.
EXAMPLES
GII input management:
gii_input_t inp, inp2, inp3;
/* Initialize the GII library. This must be called before any other
* GII function. */
if (giiInit() != 0) exit(1);
/* Open the nulldevice for testing ... */
if ((inp=giiOpen("input-null",NULL)) == NULL) {
giiExit();
exit(1);
}
/* Open stdin for testing ... */
if ((inp2=giiOpen("input-stdin",NULL)) == NULL) {
giiExit();
exit(1);
}
/* Open evdev for testing ... */
if ((inp3=giiOpen("input-linux-evdev",NULL)) == NULL) {
giiExit();
exit(1);
}
/* Now join them. Note the usage of _i_n_p_=_giiJoin(inp,inp2);
* This is the recommended way to do this. */
inp=giiJoinInputs(inp,inp2);
/* Note that this mends inp2 into inp. That is you may not call
giiClose(inp2) - this happens together with giiClose(inp) ! */
/* Join another */
inp=giiJoinInputs(inp,inp3);
/* ... do the real work here ... */
/* Split one of them back out of the join. */
res = ggiSplitInputs(inp, &inp2, GII_EV_ORIGIN_NONE, 0);
if (res == 1) {
gii_input_t tmp;
tmp = imp2;
imp2 = imp1;
imp1 = tmp;
}
else if (res < 0) fprintf(stderr, "Failed to split inputs
");
/* Close the single input */
giiClose(inp2);
/* Close the joined input */
giiClose(inp);
/* Now close down LibGII. */
giiExit();
SEE ALSO giiInit(3)libgii-1.0.x 2006-12-30 giiOpen(3)