标签:
//读取文件内容操作- (void) loadFileContentsIntoTextView{ //通过流打开一个文件 NSInputStream *inputStream = [[NSInputStream alloc] initWithFileAtPath: filePath]; [inputStream open]; NSInteger maxLength = 128; uint8_t readBuffer [maxLength]; //是否已经到结尾标识 BOOL endOfStreamReached = NO; // NOTE: this tight loop will block until stream ends while (! endOfStreamReached) { NSInteger bytesRead = [inputStream read: readBuffer maxLength:maxLength]; if (bytesRead == 0) {//文件读取到最后 endOfStreamReached = YES; } else if (bytesRead == -1) {//文件读取错误 endOfStreamReached = YES; } else { NSString *readBufferString =[[NSString alloc] initWithBytesNoCopy: readBuffer length: bytesRead encoding: NSUTF8StringEncoding freeWhenDone: NO]; //将字符不断的加载到视图 [self appendTextToView: readBufferString]; [readBufferString release]; } } [inputStream close]; [inputStream release]; }
异步文件的读取 ,在网络方面,由于网络的不可靠性可能会造成NSFileManager的文件操作方法的阻塞,而以流的方式进行操作则可以实现异步的读取。NSStream是可以异步工作的。可以注册一个在流中有字节可读的时候回调的函数,如果没有可读的,就不要阻塞住,回调出去。
版权声明:本文为博主原创文章,未经博主允许不得转载。
标签:
原文地址:http://blog.csdn.net/lihongli528628/article/details/47343289