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Info about how use websessions
* Ack: Verifies that message_count is not already 0, then decrements it. Then cur_size is decreased by the u32 loaded from msgcontent+0.
* Ack: Verifies that message_count is not already 0, then decrements it. Then cur_size is decreased by the u32 loaded from msgcontent+0.
* 0x0: Does some validation. Copies the first 8-bytes from the header to the user [[#SessionMessage]]. Reads the message content into the user [[#SessionMessage]], when contentsize is non-zero. Then sends an Ack with the storage size.
* 0x0: Does some validation. Copies the first 8-bytes from the header to the user [[#SessionMessage]]. Reads the message content into the user [[#SessionMessage]], when contentsize is non-zero. Then sends an Ack with the storage size.
Next info was tested in 9.0.0
In the js side, there is a method called <code>window.nx.sendMessage(arg)</code> that sends data to the native side, this method returns a boolean indicating if sending was succesful and accepts a string as an argument. The string is encoded like a C null terminated string in the message content. For receive messages from native part, there is a dom event called <code>message</code> which is dispatched when a message arrives. The event can be listened using <code>window.nx.addEventListener("message", callback)</code> being callback a function which first parameter is like a dom event arg and contains a member called <code>data</code> which contains the string decoded from the arrived message
If messages aren't acked by the native part, js side will not longer receive messages. Ack to web applet '''must''' have 4 bytes after the message content or will crash.
==== SessionMessage ====
==== SessionMessage ====
| Size from header
| Size from header
| Message content
| Message content
|-
| After message content
| 0x4 if message is ack, 0x0 otherwise
| Padding
|}
|}
|-
|-
| 0x1000
| 0x1000
| 0x8
| 0xc
| Ack. Content: first u32 is the entire storage size of the message being acked, while the second u32 is 0.
| Ack. Content: first u32 is the entire storage size of the message being acked, the rest is not used.
|}
|}