ubuntu 下dbus的环境搭建和使用

2021-11-07 02:35:38

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
1. #include <stdio.h>
2. #include <stdlib.h>
3. #include <dbus/dbus.h>
4. #include <unistd.h>
6. const int RES_SUCCESS = -1;
7. const int RES_FAILED = 0;
9. int my_dbus_initialization(char const * _bus_name, DBusConnection **_conn) {
10. DBusError err;
11. int ret;
13. dbus_error_init(&err);
15. *_conn = dbus_bus_get(DBUS_BUS_SESSION, &err);
16. if(dbus_error_is_set(&err)) {
17. printf("Connection Error(%s) \n", err.message);
18. dbus_error_free(&err);
19. return RES_FAILED;
20. }
22. ret = dbus_bus_request_name(*_conn, _bus_name, DBUS_NAME_FLAG_REPLACE_EXISTING, &err);
23. if(dbus_error_is_set(&err)){
24. printf("Requece name error(%s) \n", err.message);
25. dbus_error_free(&err);
26. return RES_FAILED;
27. }
28. if(DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) {
29. return RES_FAILED;
30. }
31. return RES_SUCCESS;
32. }
34. int main(int agrc, char** argv)
35. {
37. DBusError err;
38. DBusMessage* msg;
39. DBusMessageIter args;
41. dbus_error_init(&err);
42. DBusConnection *conn;
43. if (RES_FAILED == my_dbus_initialization("test.method.server", &conn)) {
44. exit(1);
45. }
47. dbus_bus_add_match(conn, "type=‘signal‘, interface=‘test.signal.Type‘", &err);
49. dbus_connection_flush(conn);
50. if(dbus_error_is_set(&err)) {
51. printf("dbus_bus_add_match err (%s)", err.message);
52. return RES_FAILED;
53. }
55. while(1) {
56. dbus_connection_read_write(conn, 0);
57. msg = dbus_connection_pop_message(conn);
59. if(NULL == msg) {
60. sleep(1);
61. continue;
62. }
64. if(dbus_message_is_signal(msg, "test.signal.Type", "Test")) {
65. if(!dbus_message_iter_init(msg, &args)) {
66. printf("dbus_message_iter_init error, msg has no arguments!\n");
67. }
68. else if (DBUS_TYPE_UINT32 != dbus_message_iter_get_arg_type(&args)){
69. printf("not a uint 32 type !\n");
70. }
71. else {
72. dbus_uint32_t my_age = 0;
73. dbus_message_iter_get_basic(&args, &my_age);
74. printf("Got signal with value %d\n", my_age);
75. }
76. }
78. dbus_message_unref(msg);
80. }
82. return 0;
83. }
85. 1. 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。
  2. 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。
  3. 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
  4. http://dbus.freedesktop.org/doc/dbus/libdbus-tutorial.html 如何用 C API 层面的 DBus ，相见恨晚。
  5. 转自：https://www.cnblogs.com/oracleloyal/p/5329947.html

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