Discussion :

[PoZZyX]

Bonjour tout le monde,

J'essaie d'envoyer des données en Bluetooth entre deux téléphones Android 4.0.1, mais je ne reçoit pas l'intégralité des données envoyées, mais que les 1008 premiers bytes.

Mon code:

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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byte[] buffer = new byte[4096];
int bytes;
 
bytes = inputStream.read(buffer);
// bytes = 1008
// buffer[1008..4095] = 0 
// =================== autre programme =============================
byte[] message = Tools.concatByteArray(response, authorizationMessage);
 
// Debug me dit environ 1400 bytes pour message
outputStream.write(message);
outputStream.flush();

Debug me donne les valeurs suivantes pour message (données envoyées):

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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et buffer (valeurs reçues):

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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Les 1008 premiers bytes sont les mêmes, donc correctement reçus, mais pas de suite

Une idée de comment corriger ça ?

Merci d'avance pour votre aide !

[adiGuba]

Salut,


Rien ne garantie que la méthode read() lisent TOUTES les données disponibles. Surtout lorsqu'on touche au réseau où il peut y avoir des temps de réponse qui entre en jeu.


Bref il faut utiliser une boucle pour lire toutes tes données (soit en allant jusqu'à la fin du flux, soit jusqu'à un certaines nombres de bytes).


a++

[PoZZyX]

La taille des données est variable :S

Par contre si je fais un sleep(1000) avant le read, ça fonctionne, mais je pense que ce n'est pas propre du tout.

Est-ce que j'ose demander comment je détecte la fin du flux ? je travaille pas souvent avec des flux

Merci d'avance

[adiGuba]

Par contre si je fais un sleep(1000) avant le read, ça fonctionne, mais je pense que ce n'est pas propre du tout.

Non seulement ce n'est pas propre, mais en plus cela ne garantie rien...

Est-ce que j'ose demander comment je détecte la fin du flux ? je travaille pas souvent avec des flux

La fin du flux survient lorsqu'il est fermé de l'autre coté (et que donc il n'y a plus rien à recevoir après).

Si tu dois encore recevoir autre chose derrière, il faudra mettre en place un protocole (même tout simple) afin de déterminer le nombre de données à lire.

Du style tu envoie la taille puis les données, puis la taille du paquet suivant et ses données, etc.



a++

[PoZZyX]

ok c'est bien ce que je pensais, en effet, le socket ne se ferme pas après, donc je vais voir ce que je peux faire avec ta suggestion de protocole.


Merci beaucoup pour ton aide !!!