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Hints for libGammu Novices
==========================
This is very short overview of libGammu usage. You will probably need to study
:doc:`api` to find out what functions you want to use.
Basic library usage
-------------------
You need to include main header file:
.. code-block:: c
#include <gammu.h>
To compile you need to pass flags from pkg-config::
pkg-config --cflags gammu
To link you need to pass from pkg-config::
pkg-config --libs gammu
Gammu stores all its data in a GSM_StateMachine struct. This structure is not
public, so all you can define is a pointer to it:
.. code-block:: c
GSM_StateMachine *state_machine;
You'll want to check for errors from time to time. Do it using a
function something like this:
.. code-block:: c
void check_error(GSM_Error err)
{
if (err == ERR_NONE) {
return;
}
fprintf(stderr, "Gammu failure: %s\n", GSM_ErrorString(error));
exit(1);
}
As libGammu does interact with strings in your local encoding, it is good idea
to initialize locales subsystem first (otherwise you would get broken non
ASCII characters):
.. code-block:: c
GSM_InitLocales(NULL);
You first need to allocate a state machine structure:
.. code-block:: c
state_machine = GSM_AllocStateMachine();
Now think about the configuration file. To use the default
:file:`~/.gammurc`, do this:
.. code-block:: c
INI_Section *cfg;
/* Find it */
error = GSM_FindGammuRC(&cfg, NULL);
check_error(error);
/* Read it */
error = GSM_ReadConfig(cfg, GSM_GetConfig(state_machine, 0), 0);
check_error(error);
/* Free allocated memory */
INI_Free(cfg);
/* We care onlu about first configuration */
GSM_SetConfigNum(s, 1);
OK, now initialise the connection (3 means number of replies you want to wait
for in case of failure):
.. code-block:: c
error = GSM_InitConnection(s, 3);
check_error(error);
Now you are ready to communicate with the phone, for example you can read
manufacturer name:
.. code-block:: c
error = GSM_GetManufacturer(s, buffer);
check_error(error);
When you're finished, you need to disconnect and free allocated memory:
.. code-block:: c
error = GSM_TerminateConnection(s);
check_error(error);
/* Free up used memory */
GSM_FreeStateMachine(s);
check_error(error);
There are also other :doc:`examples`.
Compling the code
-----------------
To compile program using Gammu library, you need to pass include path to the
compiler and library name and search path to the linker. This can be easiest
achieved by using :program:`pkg-config`. See following ``Makefile`` for
example:
.. code-block:: make
# Sample Makefile which can be used to build examples shipped with Gammu
CFLAGS=$(shell pkg-config --cflags --libs gammu-smsd) -Wall
LDFLAGS=$(shell pkg-config --cflags --libs gammu)
ALL=phone-info sms-send smsd
.PHONY: all clean
all: $(ALL)
clean:
rm -f $(ALL)
%:%.c
$(CC) $< $(CFLAGS) $(LDFLAGS) -o $@
Unicode
-------
Gammu stores all strings internally in UCS-2-BE encoding (terminated by two
zero bytes). This is used mostly for historical reasons and today the obvious
choice would be ``wchar_t``. To work with these strings, various functions
are provided (``UnicodeLength``, ``DecodeUnicode``, ``EncodeUnicode``,
``CopyUnicodeString``, etc.).
For printing on console you should use:
.. code-block:: c
printf("%s\n", DecodeUnicodeConsole(unicode_string));
For giving string to some GUI toolkit:
.. code-block:: c
printf("%s\n", DecodeUnicodeString(unicode_string));
.. note::
These functions differ only on platforms where console uses historically
different character set than GUI, what effectively means only Microsoft
Windows.
Debugging
---------
You can either enabled debug logging globally or per state machine.
To enable global debugging use:
.. code-block:: c
debug_info = GSM_GetGlobalDebug();
GSM_SetDebugFileDescriptor(stderr, FALSE, debug_info);
GSM_SetDebugLevel("textall", debug_info);
For per state machine configuration:
.. code-block:: c
debug_info = GSM_GetDebug(s);
GSM_SetDebugGlobal(FALSE, debug_info);
GSM_SetDebugFileDescriptor(stderr, FALSE, debug_info);
GSM_SetDebugLevel("textall", debug_info);
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