linux dbus 代码举例

#include <stdlib.h>#include <dbus/dbus.h>
int main(int argc, char **argv) {    DBusConnection *conn;    DBusError err;
    // 初始化错误结构体    dbus_error_init(&err);
    // 连接到系统DBus总线    conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);    if (dbus_error_is_set(&err)) {        fprintf(stderr, "Connection Error (%s)\n", err.message);        dbus_error_free(&err);        return EXIT_FAILURE;    }    if (conn == NULL) {        fprintf(stderr, "Connection Null\n");        return EXIT_FAILURE;    }
    // 创建DBus消息    DBusMessage *msg;    msg = dbus_message_new_method_call("org.freedesktop.DBus",                                       "/org/freedesktop/DBus",                                       "org.freedesktop.DBus",                                       "ListNames");
    // 发送DBus消息并等待回复    DBusMessage *reply;    reply = dbus_connection_send_with_reply_and_block(conn, msg, -1, &err);    if (dbus_error_is_set(&err)) {        fprintf(stderr, "Reply Error (%s)\n", err.message);        dbus_error_free(&err);        return EXIT_FAILURE;    }    if (reply == NULL) {        fprintf(stderr, "Reply Null\n");        return EXIT_FAILURE;    }
    // 从DBus回复中获取数据    char *str;    if (!dbus_message_get_args(reply, &err, DBUS_TYPE_ARRAY, DBUS_TYPE_STRING, &str, DBUS_TYPE_INVALID)) {        fprintf(stderr, "Get Args Error (%s)\n", err.message);        dbus_error_free(&err);        return EXIT_FAILURE;    }    printf("List of Services:\n%s\n", str);
    // 释放资源    dbus_message_unref(msg);    dbus_message_unref(reply);    dbus_connection_unref(conn);
    return EXIT_SUCCESS;}