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Mac Forum / Programming / Mac Programming / July 2006Waiting for a callback in a loop
Mac OS X Codewarrior 8.3 QuarkXTension Hi In my XTension I start a PDF export in a class (e.g. name ClassA) using the Quark-SDK function xtpdf_export. This method doesn't wait until the PDF is created. It comes back immediately. If the PDF is finished, a callback routine in another class (e.g. ClassB) of my XTension is called. Now I have to wait in ClassA (where the PDF export is started) until the PDF is finished (in the callback routine in ClassB is a flag set in that case). I like to wait in a while-loop until the flag in the callback routine is set. But if I do that the export is not started because the while-loop need all time (I suppose) or blocks the PDF creation on another way. I release the message queue in the loop, but this doesn't work. How can I solve this? Is there something like "sleep the loop" that doesn't block all other things? Thanks Hans > In my XTension I start a PDF export in a class (e.g. name ClassA) using the > Quark-SDK function xtpdf_export. This method doesn't wait until the PDF is [quoted text clipped - 6 lines] > time (I suppose) or blocks the PDF creation on another way. I release the > message queue in the loop, but this doesn't work. Rather than wait in ClassA, can't you move the post-pdf-creation code to a new method and call that from your callback routine in ClassB? patrick Hi Yes, I can move the post code into the callback routine. But is that the solution? Thne I have to wait in the callbck routine and the application is blocked. ClassB has a loop where are several pdf exports are done. But I can't do a pdf export in this loop while another pdf export is running. Thats because I have to wait until the callback in ClassA is called, means the pdf export is finished. Then I can do the next export. Its quite tricky I think. Maybe I can start the export in ClassA and wait after that for a specified event. In my callback routine in ClassB I send the event if the pdf is finished? Possible? How? During the waiting for the event the application may not be blocked! Thanks Hans >> In my XTension I start a PDF export in a class (e.g. name ClassA) using >> the [quoted text clipped - 17 lines] > > patrick > ClassB has a loop where are several pdf exports are done. But I can't do a > pdf export in this loop while another pdf export is running. Thats because I > have to wait until the callback in ClassA is called, means the pdf export is > finished. Then I can do the next export. Its quite tricky I think. OK, now you're providing new information... So you need to do a number of asynchronous pdf exports in ClassB. I would make ClassB maintain a stack of export tasks. Start the export of the top task in the export method you call from ClassA. In the ClassB callback you can simply call the export method again to process the next task. When the stack is depleted, you can call the ClassA callback. patrick Hi Patrick Thank you very much for the answer. This way doesn't solve my problem. I can't build a stack from export tasks because the Quark document (QXP) has to be open for the export. This means I have to open the Quark document, export it as a PDF and close it again. I open the Quark document in ClassB and call the method xtpdf_export to export it as PDF. Then I have to wait until the callback function in ClassA (PDF finished) is called from the export method xtpdf_export. After the callback is called, I can close the document (QXP). If I close the document before the PDF is finished, the XTension crashs. Thats the reason I have to wait in a loop. When I wait, the xtpdf_export calls the callback "PDF export started", but after that no callback method is called. I don't know why. On Windows this works fine, on Mac OS X not. Regards Hans >> ClassB has a loop where are several pdf exports are done. But I can't do >> a [quoted text clipped - 13 lines] > > patrick |
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