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PONSStream closing too soon
 

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    <p>I have been doing a client-server communication for a while in iOS but I am here faced to an issue I have some troubles to understand.</p> <p>I wrote two basic functions: one to send data to the server and the other to receive data from the server. Each one has a parameter called timeout which allows to make the current thread sleep and wake up every 0.25s until the timeout is reached:</p> <pre><code>-(ReturnCode) send : (NSData*)data :(int)timeOut { if(![self isConnectionOpened]) return KO; float timer = 0; while(![_outputStream hasSpaceAvailable]) { [NSThread sleepForTimeInterval:0.25]; timer+=0.25; if(timer == timeOut) break; } int ret = 0; if([_outputStream hasSpaceAvailable]){ int lg = [data length]; ret = [_outputStream write:[data bytes] maxLength:lg]; if(ret == -1) return KO; else return OK; } return TIMEOUT; } - (ReturnCode) receive : (NSData**)data : (int)timeOut : (int)maxLength { uint8_t buffer[maxLength]; int len; NSMutableData* dataReceived = [[NSMutableData alloc] init]; if(! [self isConnectionOpened]) return KO; float timer = 0; while(![_inputStream hasBytesAvailable]) { [NSThread sleepForTimeInterval:0.25]; timer+=0.25; if(timer == timeOut) break; } if(![_inputStream hasBytesAvailable]) return TIMEOUT; while ([_inputStream hasBytesAvailable]) { len = [_inputStream read:buffer maxLength:sizeof(buffer)]; if (len &gt; 0) { [dataReceived appendBytes:buffer length:len]; *data = dataReceived; return OK; } } return KO; } </code></pre> <p>With iPhone 4 + iOS6, everything is going fine. But under iOS7, for some fuzzy reasons, inputstream and outputstream are closing prematurely (NSStreamEventErrorOccurred raised). The fact is, if I put a breakpoint just before receiving data from server and make the code run, it works fine and reading/writing streams dont close wrongly.</p> <p>So I think there is a synchronisation problem but I dont understand why... If anyone has ideas, pls help... </p>
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