ubuntu 下dbus的环境搭建和使用

从https://launchpad.net/ubuntu/+source/dbus/1.10.6-1ubuntu2下载需要的dbus包，然后解压，./configure make && make install

client.c

#include <stdio.h>

#include <stdlib.h>

#include <dbus/dbus.h>

#include <unistd.h>

const int RES_SUCCESS = -1;

const int RES_FAILED = 0;

int my_dbus_initialization(char const * _bus_name, DBusConnection ** _conn) {

DBusError err;

int ret;

dbus_error_init(&err);

*_conn = dbus_bus_get(DBUS_BUS_SESSION, &err);

if(dbus_error_is_set(&err)) {

printf("Connection Error\n");

dbus_error_free(&err);

return RES_FAILED;

}

ret = dbus_bus_request_name(*_conn, _bus_name, DBUS_NAME_FLAG_REPLACE_EXISTING, &err);

if(dbus_error_is_set(&err)){

printf("Requece name error \n");

dbus_error_free(&err);

return RES_FAILED;

}

if(DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) {

return RES_FAILED;

}

return RES_SUCCESS;

}

int my_dbus_send_sigal(DBusConnection * conn) {

dbus_uint32_t serial = 0;

DBusMessage* msg;

DBusMessageIter args;

char sigvalue[20] = "liyiwen";

msg = dbus_message_new_signal("/test/signal/Object", // object name

"test.signal.Type", // interface name

"Test"); // name of signal

if (NULL == msg) {

printf("Message Null");

return RES_FAILED;

}

dbus_message_iter_init_append(msg, &args);

printf("%s\n", sigvalue);

dbus_uint32_t my_age = 10;

if(!dbus_message_iter_append_basic(&args, DBUS_TYPE_UINT32, &my_age)) {

printf("Out of memory\n");

return RES_FAILED;

}

if(!dbus_connection_send(conn, msg, &serial)) {

printf("Out of memory");

return RES_FAILED;

}

dbus_connection_flush(conn);

dbus_message_unref(msg);

return RES_SUCCESS;

}

int main(int agrc, char** argv)

{

DBusConnection * conn;

printf("Start\n");

if (RES_FAILED == my_dbus_initialization("test.method.client", &conn)) {

exit(1);

}

my_dbus_send_sigal(conn);

while(1){sleep(10);}

return 0;

}

sercer.c

#include <stdio.h>

#include <stdlib.h>

#include <dbus/dbus.h>

#include <unistd.h>

const int RES_SUCCESS = -1;

const int RES_FAILED = 0;

int my_dbus_initialization(char const * _bus_name, DBusConnection **_conn) {

DBusError err;

int ret;

dbus_error_init(&err);

*_conn = dbus_bus_get(DBUS_BUS_SESSION, &err);

if(dbus_error_is_set(&err)) {

printf("Connection Error(%s) \n", err.message);

dbus_error_free(&err);

return RES_FAILED;

}

ret = dbus_bus_request_name(*_conn, _bus_name, DBUS_NAME_FLAG_REPLACE_EXISTING, &err);

if(dbus_error_is_set(&err)){

printf("Requece name error(%s) \n", err.message);

dbus_error_free(&err);

return RES_FAILED;

}

if(DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) {

return RES_FAILED;

}

return RES_SUCCESS;

}

int main(int agrc, char** argv)

{

DBusError err;

DBusMessage* msg;

DBusMessageIter args;

dbus_error_init(&err);

DBusConnection *conn;

if (RES_FAILED == my_dbus_initialization("test.method.server", &conn)) {

exit(1);

}

dbus_bus_add_match(conn, "type='signal', interface='test.signal.Type'", &err);

dbus_connection_flush(conn);

if(dbus_error_is_set(&err)) {

printf("dbus_bus_add_match err (%s)", err.message);

return RES_FAILED;

}

while(1) {

dbus_connection_read_write(conn, 0);

msg = dbus_connection_pop_message(conn);

if(NULL == msg) {

sleep(1);

continue;

}

if(dbus_message_is_signal(msg, "test.signal.Type", "Test")) {

if(!dbus_message_iter_init(msg, &args)) {

printf("dbus_message_iter_init error, msg has no arguments!\n");

}

else if (DBUS_TYPE_UINT32 != dbus_message_iter_get_arg_type(&args)){

printf("not a uint 32 type !\n");

}

else {

dbus_uint32_t my_age = 0;

dbus_message_iter_get_basic(&args, &my_age);

printf("Got signal with value %d\n", my_age);

}

}

dbus_message_unref(msg);

}

return 0;

}

http://dbus.freedesktop.org/doc/dbus-specification.html 这当然是最权威最重要的资料，但我觉得不是一个很好的入门资料。

http://dbus.freedesktop.org/doc/dbus-tutorial.html 这里面有一些不错的例子，对Names 的解释也很好，但用的是 glib 的 binding，不能探究更底层的动作一度还是让我云里雾里。

http://dbus.freedesktop.org/doc/api/html/group__DBusMessage.html DBus 的 C 编程接口的在线文档，非常棒也非常有用

http://dbus.freedesktop.org/doc/dbus/libdbus-tutorial.html 如何用 C API 层面的 DBus ，相见恨晚。