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Hi,
my application is designed to upload files via an HTTP POST
request. I am using libcurl to do this, as libcurl allows me to
monitor the upload progress (which NSURLConnection obviously does
not). However, I am having a problem: Naturally, I want the user
to be able to click a button to immediately stop the upload. I am
uploading the files in a secondary thread. If I use the good ol'
technique that's using a BOOL variable to tell the secondary
thread to stop, this won't work properly as the thread will only
be able to check the variable between file uploads. So if the user
triggers a 10 MB upload and wants to stop that, they will have to
wait until the 10 MBs are uploaded before the thread stops.
The thing is, that I cannot interfere with the uploading (I
guess). I simply call "curl_easy_perform()" and off it goes. The
problem I've posted here to me seems to be one of the more
fundamental "things-everybody-needs". E.g., Safari allows you to
stop the download of files, too. So does more or less any
networking application I can think of right now.
How are they doing that?
Regards,
Michael
PS: Remember: I am talking about UPloading files. DOWNloading
actually seems to be supported very well and boasting any feature
you'd ever wish for...
In Cocoa apps, you shouldn't kill a thread. Read the Multithreading
Programming Topics in the docs.
For your particular problem, you need to use the curl_multi API.
Out of interest, why couldn't you use NSURLConnection. I've not tried
it, but couldn't you hook into NSInputStream to monitor how much data
has been loaded? I'd have thought this might work although only on 10.4.
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