Form gets freezed during loading data in a seperate thread

Question

I use TIdHTTP component to load xml data from a bank in a seperate thread but my form is getting freezed during that time...

what could be the problem ?

I have a main form and thread class, in thread class i have a method called loadData and on thread::Execute i Synchronize(loadData);

when button gets clicked I created the instance of thread class like testThread *t=new testThread(false);

and that's all

when i click the button the main form freezes? even seperate thread didn't help????

Please help!!!

score 0 · Answer 1 · answered Mar 31 '11 at 06:19

0

Synchronize() is running your loadData() method in the context of the main thread, not in the context of your worker thread. That is why your main thread blocks while loadData() is busy. You are misusing Synchronize(), rendering your thread useless. You need to do the bulk of your thread work outside of Synchronize(), and then use Synchronize() only to perform small updates in the main thread when needed, like displaying status (even then, Synchronize() is not always the best choice for that).

answered Mar 31 '11 at 06:19

Remy Lebeau

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Hi Remy! Do i need simply call loadData() method instead of Synchronize(loadData); – Suhrob Samiev Mar 31 '11 at 11:55
Yes. Use `Synchronize()` only when you need to run code in the main thread instead of your worker thread. – Remy Lebeau Mar 31 '11 at 22:46
AFAIK Synchronize is used to update the state of VCL components, as I called loadData(); on Execute event, Grid displayed nothing???? – Suhrob Samiev Apr 01 '11 at 11:01
Yes, `Synchronize()` would need to be used to update your Grid when needed. Not to drive your entire `loadData()` logic as a whole. – Remy Lebeau Apr 04 '11 at 07:20

Form gets freezed during loading data in a seperate thread

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