通信示例

#include <dbus/dbus.h>
#include <cstddef>
#include <cstdio>
#include <iostream>
int main(int argc, char *argv[]) {
    (void)argc;
    (void)argv;
    DBusError dbus_error;
    DBusConnection *dbus_conn = nullptr;
    DBusMessage *dbus_msg = nullptr;
    DBusMessage *dbus_reply = nullptr;
    const char *dbus_result = nullptr;
    // Initialize D-Bus error
    ::dbus_error_init(&dbus_error);
    // Connect to D-Bus
    if (nullptr == (dbus_conn = ::dbus_bus_get(DBUS_BUS_SYSTEM, &dbus_error))) {
        ::perror(dbus_error.name);
        ::perror(dbus_error.message);
        // Compose remote procedure call
    } else if (nullptr == (dbus_msg = ::dbus_message_new_method_call("org.freedesktop.DBus", "/", "org.freedesktop.DBus.Introspectable", "Introspect"))) {
        ::dbus_connection_unref(dbus_conn);
        ::perror("ERROR: ::dbus_message_new_method_call - Unable to allocate memory for the message!");
        // Invoke remote procedure call, block for response
    } else if (nullptr == (dbus_reply = ::dbus_connection_send_with_reply_and_block(dbus_conn, dbus_msg, DBUS_TIMEOUT_USE_DEFAULT, &dbus_error))) {
        ::dbus_message_unref(dbus_msg);
        ::dbus_connection_unref(dbus_conn);
        ::perror(dbus_error.name);
        ::perror(dbus_error.message);
        // Parse response
    } else if (!::dbus_message_get_args(dbus_reply, &dbus_error, DBUS_TYPE_STRING, &dbus_result, DBUS_TYPE_INVALID)) {
        ::dbus_message_unref(dbus_msg);
        ::dbus_message_unref(dbus_reply);
        ::dbus_connection_unref(dbus_conn);
        ::perror(dbus_error.name);
        ::perror(dbus_error.message);
        // Work with the results of the remote procedure call
    } else {
        std::cout << "Connected to D-Bus as \"" << ::dbus_bus_get_unique_name(dbus_conn) << "\"." << std::endl;
        std::cout << "Introspection Result:" << std::endl;
        std::cout << std::endl
                  << dbus_result << std::endl
                  << std::endl;
        ::dbus_message_unref(dbus_msg);
        ::dbus_message_unref(dbus_reply);
        /*
         * Applications must not close shared connections -
         * see dbus_connection_close() docs. This is a bug in the application.
         */
        //::dbus_connection_close(dbus_conn);
        // When using the System Bus, unreference
        // the connection instead of closing it
        ::dbus_connection_unref(dbus_conn);
    }
    return 0;
}点击复制复制失败已复制

LDFLAGS += -lhv -ldbus-1
SRCS_DIR := $(wildcard ./*.cpp)
all: clean bin/test
bin/test:
    mkdir -p bin
    $(CXX) $(CFLAGS) $(SRCS_DIR) -o $@ $(LDFLAGS)
clean:
    rm -rf bin
.PHONY: clean 点击复制复制失败已复制

$ make && ./bin/test点击复制复制失败已复制

Connected to D-Bus as ":1.218".
Introspection Result:
<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
  <interface name="org.freedesktop.DBus">
    <method name="Hello">
      <arg direction="out" type="s"/>
    </method>
    <method name="RequestName">
      <arg direction="in" type="s"/>
      <arg direction="in" type="u"/>
      <arg direction="out" type="u"/>
    </method>
    <method name="ReleaseName">
      <arg direction="in" type="s"/>
      <arg direction="out" type="u"/>
    </method>
    <method name="StartServiceByName">
      <arg direction="in" type="s"/>
      <arg direction="in" type="u"/>
      <arg direction="out" type="u"/>
    </method>
    <method name="UpdateActivationEnvironment">
      <arg direction="in" type="a{ss}"/>
    </method>
    <method name="NameHasOwner">
      <arg direction="in" type="s"/>
      <arg direction="out" type="b"/>
    </method>
    <method name="ListNames">
      <arg direction="out" type="as"/>
    </method>
    <method name="ListActivatableNames">
      <arg direction="out" type="as"/>
    </method>
    <method name="AddMatch">
      <arg direction="in" type="s"/>
    </method>
    <method name="RemoveMatch">
      <arg direction="in" type="s"/>
    </method>
    <method name="GetNameOwner">
      <arg direction="in" type="s"/>
      <arg direction="out" type="s"/>
    </method>
    <method name="ListQueuedOwners">
      <arg direction="in" type="s"/>
      <arg direction="out" type="as"/>
    </method>
    <method name="GetConnectionUnixUser">
      <arg direction="in" type="s"/>
      <arg direction="out" type="u"/>
    </method>
    <method name="GetConnectionUnixProcessID">
      <arg direction="in" type="s"/>
      <arg direction="out" type="u"/>
    </method>
    <method name="GetAdtAuditSessionData">
      <arg direction="in" type="s"/>
      <arg direction="out" type="ay"/>
    </method>
    <method name="GetConnectionSELinuxSecurityContext">
      <arg direction="in" type="s"/>
      <arg direction="out" type="ay"/>
    </method>
    <method name="GetConnectionAppArmorSecurityContext">
      <arg direction="in" type="s"/>
      <arg direction="out" type="s"/>
    </method>
    <method name="ReloadConfig">
    </method>
    <method name="GetId">
      <arg direction="out" type="s"/>
    </method>
    <method name="GetConnectionCredentials">
      <arg direction="in" type="s"/>
      <arg direction="out" type="a{sv}"/>
    </method>
    <property name="Features" type="as" access="read">
      <annotation name="org.freedesktop.DBus.Property.EmitsChangedSignal" value="const"/>
    </property>
    <property name="Interfaces" type="as" access="read">
      <annotation name="org.freedesktop.DBus.Property.EmitsChangedSignal" value="const"/>
    </property>
    <signal name="NameOwnerChanged">
      <arg type="s"/>
      <arg type="s"/>
      <arg type="s"/>
    </signal>
    <signal name="NameLost">
      <arg type="s"/>
    </signal>
    <signal name="NameAcquired">
      <arg type="s"/>
    </signal>
  </interface>
  <interface name="org.freedesktop.DBus.Introspectable">
    <method name="Introspect">
      <arg direction="out" type="s"/>
    </method>
  </interface>
  <interface name="org.freedesktop.DBus.Peer">
    <method name="GetMachineId">
      <arg direction="out" type="s"/>
    </method>
    <method name="Ping">
    </method>
  </interface>
  <node name="org/freedesktop/DBus"/>
</node>