For debugging purposes I've often written data to files on iOS using code such as this...
NSString *docsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *filePath = [docsPath stringByAppendingPathComponent:testName];
FILE* resultsFile = fopen([filePath UTF8String],"w");
...and then gotten the data by downloading the container via Xcode (by selecting the app on the "Window->Devices" screen, and choosing "Download container..." from the "little gear" pop-up menu just below the list of apps.)
I recall this working on iOS 9 and previous, but trying this on iOS 10 on an iPhone 6, I'm finding it doesn't work anymore. The call to fopen is returning success for /var/mobile/Containers/Data/Application/[uuid]/Documents/testname but the file isn't in the container when I download it.
Shouldn't the file be in the container? Is it elsewhere? Or is it simply not possible to dump data to a file and pull it off the phone anymore?
from iOS10 filesystem - are files no longer in app container?
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