Deezer native API under linux: Unanble to create simple app - c++

Question

I tried to create simple app which will connect to deezer and play single song. I got access token and wrote this program.
Target machine: linux x86_64
API version: v1.0.1
#include <iostream>
#include <deezer-api.h>
#include <deezer-player.h>
#define ACCESS_TOKEN "ACCESS TOKEN HERE"
int main(int argc, char **argv)
{
dz_connect_configuration cfg = {0};
cfg.app_id = "APP ID HERE";
cfg.product_id = "product_id";
cfg.product_build_id = "0.0.0";
dz_connect_handle dz_handle = dz_connect_new(&cfg);
if (dz_handle == nullptr)
{
return 100;
}
auto err_code = dz_connect_activate(dz_handle, nullptr);
if (err_code > DZ_ERROR_NO_ERROR_ASYNC)
{
return err_code;
}
err_code = dz_connect_set_access_token(dz_handle, nullptr, nullptr, ACCESS_TOKEN);
if (err_code > DZ_ERROR_NO_ERROR_ASYNC)
{
return err_code;
}
auto dz_player_handle = dz_player_new(dz_handle);
if (dz_player_handle == nullptr)
{
return 200;
}
err_code = dz_player_activate(dz_player_handle, nullptr);
if (err_code > DZ_ERROR_NO_ERROR_ASYNC)
{
return err_code;
}
err_code = dz_player_load(dz_player_handle, nullptr, nullptr, "dzmedia:///track/3135556");
if (err_code > DZ_ERROR_NO_ERROR_ASYNC)
{
return err_code;
}
err_code = dz_player_play(dz_player_handle, nullptr, nullptr, DZ_PLAYER_PLAY_CMD_START_TRACKLIST, DZ_TRACKLIST_AUTOPLAY_MANUAL, DZ_INDEX_IN_PLAYLIST_CURRENT);
if (err_code > DZ_ERROR_NO_ERROR_ASYNC)
{
return err_code;
}
std::cin.get();
return 0;
}
Suddenly i ran into problems.
First run shows me this output:
398748:201417 dz_bufferevent: [dz_bufferevent_on_activation:561] could not open /var/tmp/settings.dat
I created this file, but I suspect that it shouldn't be empty.
After second run with /var/tmp/settings.dat created i got this output:
399206:328658 dz_crash_handler: [dz_crash_handler_init:284] Crash Handler available
399206:329404 dzcrashreport-server-disk: [dz_crashreport_server_url_on_read_data:436] ERROR - Open failure err: 7
399206:329533 dzcrashreport-server-disk: [dz_crashreport_server_url_on_read_data:436] ERROR - Open failure err: 7
399206:329590 dzcrashreport-server-disk: [dz_crashreport_server_url_on_read_data:436] ERROR - Open failure err: 7
399206:329664 dzcrashreport-server-disk: [dz_crashreport_server_url_on_read_data:436] ERROR - Open failure err: 7
399206:329726 dzcrashreport-server-disk: [dz_crashreport_server_url_on_read_data:436] ERROR - Open failure err: 7
399206:329736 dzcrashreport-sender: [dz_crash_report_sender_retrieve_server_url_on_result:213] Error - couldn't read URL server err:0
399206:336505 pulseaudio-engine: [dz_audioengine_set_output_gain:1184] not init
399206:336520 pulseaudio-engine: [dz_audioengine_set_output_gain:1184] not init
399206:336577 player: [dz_player_play_licence:1756] unknown error 131079
I can't understand, what i did wrong?
UPDATE:
Deezer Native API: v1.0.1-v00349200
Still no luck. Tried different variations of "user_profile_path":
.
./
./user - was created in working dir with 777 rights
/var/tmp
There were no files in the folder created by API.
Still got errors:
[dz_crashreport_server_url_on_read_data:436] ERROR - Open failure err: 7
[dz_crash_report_sender_retrieve_server_url_on_result:213] Error - couldn't read URL server err:0
After adding implementation of callbacks i see this:
dz_connect_set_access_token calls callback dz_activity_operation_callback with status DZ_ERROR_CONNECT_SESSION_OFFLINE_MODE
dz_player_play calls callback dz_player_onevent_cb with event DZ_PLAYER_EVENT_PLAYLIST_TRACK_NO_RIGHT
Well, i checked that i have rights to play this track.

Answer 1

the "could not open" message is just informative.
The file will be automatically created (or updated if detected corrupted).
The issue seems more linked to the dz_connect_configuration, you have to set the "user_profile_path" to a valid path. This is where user temporary files will be stored.
Regards,
Cyril
UPDATE:
Few tips that could also help:
My mistake, one call seems missing:
dz_connect_cache_path_set(dz_handle, NULL, NULL, <user_profile_path>);
The DZ_INDEX_IN_PLAYLIST_CURRENT must be replaced by 0. I do agree this one is not obvious...
Check that the access_token you have created has the offline_access enable when calling https://connect.deezer.com/oauth/auth.php?app_id=YOUR_APP_ID&redirect_uri=YOUR_REDIRECT_URI&perms=basic_access,email,offline_access (cf: http://developers.deezer.com/api/oauth and http://developers.deezer.com/api/permissions)
UPDATE 2:
Since my last answer I have released a sample code on Github:
https://github.com/deezer/native-sdk-samples
I suggest that you have a quick look :)
What I have noticed in your full code you sent me in private is that:
You are not calling dz_connect_offline_mode(...,false); It will actually trigger the login process of the Native SDK.
You are not waiting the DZ_CONNECT_EVENT_USER_LOGIN_OK to load and play the track.
Best regards,
Cyril