NPNInvoke - Passing plugin data back to browser

I am calling back an object in Javascript using NPAPI. Before this call, the functions I am calling result in proper invocation of functions in JavaScript but it fails in NPN_Invoke calls.

Code Snippet:

sBrowserFuncs->releaseobject(object_temp);
object_temp = NPVARIANT_TO_OBJECT(args[0]);
sBrowserFuncs->retainobject(object_temp);

if (send_msg1(sBrowserFuncs, instance, msg_rcv, NPVARIANT_TO_OBJECT(args[0]), msg, n开发者_如何学Goame_id))

sendmsg1 spawns a new thread and this thread calls msg_rcv back. Is it okay for spawned thread to call the main thread function, is that reason of error. ... Her call to NPN_Invoke is called

NPVariant from;

STRINGZ_TO_NPVARIANT(sdata->from, from);
NPIdentifier methodId = NPN_GetStringIdentifier("new_msg");
int res = NPN_Invoke(sdata->instance, object_temp, methodId, &from, 1, &result);

sdata->instance matches with instance object_temp is last called object stored

It returns 0, while in successful case it returns 1.

In which case NPN_Invoke generates 0,

As far as i know , any NPN_* call should be issued from the plugin thread. You can check NPN_PluginThreadAsyncCall. I this way you can execute methods from another thread , on the main/plugin thread and avoid a nasty crash :)