How to programmatically create an empty .m4a file of a certain length under iOS using CoreAudio on device?

问题

I need to create a dummy .m4a file of a certain length programatically under iOS...

回答1:

try this

NSError *error = nil;
path = [path stringByAppendingPathComponent:@"tempfile"];
NSURL *URL = [NSURL fileURLWithPath:path];
[[NSFileManager defaultManager]createFileAtPath:path contents:nil attributes:nil]
NSFileHandle *writeFile = [NSFileHandle fileHandleForWritingToURL:URL error:&error];
[writeFile truncateFileAtOffset:4000000000*sizeof(Byte)];

来源：https://stackoverflow.com/questions/7011070/how-to-programmatically-create-an-empty-m4a-file-of-a-certain-length-under-ios