Thanks John and Ranier. At least I'm confirmed now I can not update the attributions of IUP controls in other threads so my previous programming module was definitely wrong.
So the question becomes how to send the control update event to the main thread? It's quite obvious the main thread is stuck in IupMainLoop(). Most events can be processed in this main thread, like buttons, text, etc. When users click the button, or inside the text input entry, the IUP generates the event and it will be processed in IupMainLoop(). However, how an external thread send the event into the main thread? I can't use message queue or semaphore because IupMainLoop() takes all the control. Are there some functions used for inserting IUP events? Kind regards Andy
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