AliVireTechnologies1
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Subject: How can i find that if someone has changed his avatar picture
I am saving contacts with picture on local device, but if someone change his profile picture then how can i detect it or find out.
This post was edited on 2013-07-12, 10:41 by 
this is described here in XEP-0153: vCard-Based Avatars.
See example 3 there. You add a Hash (SHA-1) of your photo to your presence. When you receive a presence with a Hash you check if you have the Image for this Hash. And only if you don't have it you request the vcard and store the image in your local storage.
I usually use the hash as the filename for the images.
See example 3 there. You add a Hash (SHA-1) of your photo to your presence. When you receive a presence with a Hash you check if you have the Image for this Hash. And only if you don't have it you request the vcard and store the image in your local storage.
I usually use the hash as the filename for the images.
Forum: MatriX and XmppDotNet 