Hello!
I developped a simple code using dbus, it successed on PC, but it
failed on the freerunner
showing this error messaj:
Connection Error (dbus-launch failed to autolaunch D-Bus session:
Autolaunch requested, but X11 support not compiled in.
Cannot continue.
)
the attached file is my code sender.c
what is the reaseon, and what should I do
/*
* Example low-level D-Bus code.
* Written by Matthew Johnson <d...@matthew.ath.cx>
*
* This code has been released into the Public Domain.
* You may do whatever you like with it.
*/
#include <dbus/dbus.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
/**
* Connect to the DBUS bus and send a broadcast signal
*/
void sendsignal(int sigvalue)
{
DBusMessage* msg;
DBusMessageIter args;
DBusConnection* conn;
DBusError err;
int ret;
dbus_uint32_t serial = 0;
printf("Sending signal with value %d\n", sigvalue);
// initialise the error value
dbus_error_init(&err);
// connect to the DBUS system bus, and check for errors
conn = dbus_bus_get(DBUS_BUS_SESSION, &err);
if (dbus_error_is_set(&err)) {
fprintf(stderr, "Connection Error (%s)\n", err.message);
dbus_error_free(&err);
}
if (NULL == conn) {
exit(1);
}
// register our name on the bus, and check for errors
ret = dbus_bus_request_name(conn, "test.signal.source", DBUS_NAME_FLAG_REPLACE_EXISTING , &err);
if (dbus_error_is_set(&err)) {
fprintf(stderr, "Name Error (%s)\n", err.message);
dbus_error_free(&err);
}
// if (DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) {
// exit(1);
//}
// create a signal & check for errors
msg = dbus_message_new_signal("/test/signal/Object", // object name of the signal
"test.signal.Type", // interface name of the signal
"Test"); // name of the signal
if (NULL == msg)
{
fprintf(stderr, "Message Null\n");
exit(1);
}
// append arguments onto signal
dbus_message_iter_init_append(msg, &args);
if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_INT32,&sigvalue)) {
fprintf(stderr, "Out Of Memory!\n");
exit(1);
}
// send the message and flush the connection
if (!dbus_connection_send(conn, msg, &serial)) {
fprintf(stderr, "Out Of Memory!\n");
exit(1);
}
dbus_connection_flush(conn);
printf("Signal Sent\n");
// free the message
dbus_message_unref(msg);
printf("ok1 \n");
return ;
}
int main(int argc, char** argv)
{
int param = 4;
int x,i;
FILE* in3 = fopen("event3", "r");
for (i=0;i<16;i++)
{
fread(&x, 1, 4, in3);
sendsignal(x);
}
fclose(in3);
sendsignal(param);
return 0;
}
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