Web连续调用了两次startWriting说明在状态改变之前又有新的回调函数调用了,猜想视频数据包和音频数据包处理是在不同线程进行的,几乎同时调用了回调函数,而回调函数并没有采用任何的线程锁机制,导致startWriting被调用了两次,从而引起AVAssetWriterStatusFailed错误,而偶尔成功的几次,应该是多线程 ... Creates a data object that holds a given number of bytes from a given buffer. + dataWithData: Creates a data object containing the contents of another data object. - initWithBytes:length: Initializes a data object filled with a given number of bytes copied from a given buffer. - initWithBytesNoCopy:length: Initializes a data object filled with ...
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WebMay 2, 2016 · Storing and Restoring std::vector from NSData. I am attempting to store std::vector to NSData and back directly. My first attempt I converted each point to an NSValue and stored them with NSKeyedUnarchiver which seems terribly inefficient. My test dataset required 64MB of human readable text (with NSKeyedUnarchiver), versus … WebOct 4, 2010 · NSData *dataToEncode = [NSData dataWithBytesNoCopy:base64buffer length:sizeof (base64buffer) freeWhenDone:YES]; This line will do free (base64buffer) when the dataToEncode deallocated, because the freeWhenDone:YES. So, you will free the same memory space twice. Share Improve this answer Follow answered Oct 4, 2010 at 10:42 … deals charleston
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WebAug 3, 2012 · (оригинал — Mike Ash, взято отсюда) Многие Cocoa разработчики имеют довольно смутное представление об Objective-C Runtime API. Они знают, что он существует где-то там (некоторые не знают даже … WebGCDAsyncUdpSocket. @interface GCDAsyncUdpSocket : NSObject. GCDAsyncUdpSocket uses the standard delegate paradigm, but executes all delegate callbacks on a given delegate dispatch queue. This allows for maximum concurrency, while at the same time providing easy thread safety. You MUST set a delegate AND delegate dispatch queue … WebCreates a data object that holds a given number of bytes from a given buffer. general pneumatics desiccant dryer