[Playerstage-users] problem with Blackboard

[kingwinter <kin...@gm...>]

I am trying to let robot1 to write data to blackboard and use robot2 to read
data in every 1s. The robot1 player client code is:
>>>>robot1f.cpp>>>>>>>>

#include <libplayerc++/playerc++.h>
#include <iostream>

#include "args.h"
#define KEY "SSL"
#define GROUP "JD"

using namespace std;


int main(int argc, char **argv)
{
    using namespace PlayerCc;
    const char * key = strdup(KEY);;
    const char * group = strdup(GROUP);
    PlayerClient robot ("localhost", 6665);
    BlackBoardProxy bb (&robot, 0);
    bb.SubscribeToKey(key, group);
    player_blackboard_entry_t *entry = new player_blackboard_entry_t;
    memset(entry, 0, sizeof(entry));
    entry->key = strdup(KEY);
    entry->key_count = strlen(KEY) + 1;
    entry->data = new uint8_t[4];
    entry->data[0] = 4;
    entry->data[1] = 3;
    entry->data[2] = 2;
    entry->data[3] = 1;
    entry->data_count = 4;
    while(1)
    {
    bb.SetEntry(*entry);


    sleep(1);
    }

}


>>>>>>>>>>>>>>>>>>>
and robot2.cpp are following code
>>>>>>>>>>>>>

#include <libplayerc++/playerc++.h>
#include <iostream>

#include "args.h"
#define KEY "SSL"
#define GROUP "JD"

using namespace std;
void On_First_Device_Event(playerc_blackboard_t *blackboard,
player_blackboard_entry_t event)
{
      printf("First device event fired for key '%s'\n", event.key);
      printf("Key value = %d,%d,%d,%d\n", event.data[0], event.data[1],
event.data[2], event.data[3]);
}

int main(int argc, char **argv)
{
    using namespace PlayerCc;
    const char * key = strdup(KEY);;
    const char * group = strdup(GROUP);
    PlayerClient robot ("localhost", 6665);
    BlackBoardProxy bb (&robot, 0);
    bb.SubscribeToKey(key, group);
    player_blackboard_entry_t *entry;
    bb.SetEventHandler(On_First_Device_Event);

    while(1)
    {
        //robot.Read();
        entry = bb.GetEntry(KEY,GROUP);

    cerr<<"datacount"<<entry->data_count<<endl;

    sleep(1);
}
}

>>>>>>>>>>>>>the player server cfg file is
 driver
 (
		name "localbb"
		provides [ "blackboard:0" ]
 )
>>>>>>>>>>>>>>>>>>

I start to run player server and then run robot1 first. Then I start the
robot2. It looks it cannot get the entry written by robot1. It output the
"datacount0" rather than expected "datacount4". If I uncomment the line of
"robot.Read()", then program stuck there and cannot return from read(). 
Any idea about the problem? Shall I acknowledge player when I setentry in
robot1?

Thanks
Kingwinter 
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