Multithreading and Printing

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   I am encountering a variety of problems when trying to print separate documents concurrently to different printers in separate threads.  Is this supposed to work in v7 (with Delphi XE)?  If not, should it work in v8 (we have not upgraded this app yet).  And if still not, then should it be sufficient just to put the qp.PrintDocument inside a critical section, or would I need to do the whole create-load-print-free one at a time?

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tfrost Members Profile Find Members Posts Senior Member Joined: 06 Sep 10 Location: UK Status: Offline Points: 437	Post Options Post Reply Quote tfrost Report Post Thanks(0) Quote Reply Topic: Multithreading and Printing Posted: 17 Nov 11 at 1:07AM
	I am encountering a variety of problems when trying to print separate documents concurrently to different printers in separate threads. Is this supposed to work in v7 (with Delphi XE)? If not, should it work in v8 (we have not upgraded this app yet). And if still not, then should it be sufficient just to put the qp.PrintDocument inside a critical section, or would I need to do the whole create-load-print-free one at a time?

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 17 Nov 11 at 10:20PM
	Hi! As far as i know QP isn't threadsafe. So check the returning value before running the next printerjob. Other opinions? Cheers, Ingo