swift 为 NSStream 创建字节缓冲区持有者

in the Ray Wenderlich 套接字教程 http://www.raywenderlich.com/3932/networking-tutorial-for-ios-how-to-create-a-socket-based-iphone-app-and-server为了从 Objective-C 中的输入流读取字节，我们做了

uint8_t buffer[1024];
        int len;

        while ([inputStream hasBytesAvailable]) {
            len = [inputStream read:buffer maxLength:sizeof(buffer)];
            if (len > 0) {

                NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding];

                if (nil != output) {
                    NSLog(@"server said: %@", output);
                }

在 Swift 中我尝试了以下方法但没有取得太大成功

        if (stream == inputStream) {
//            var buffer = Array<UInt8>(count: 1024, repeatedValue: 0)
            var buffer : UnsafeMutablePointer<UInt8>
            var len : Bool

            while (inputStream?.hasBytesAvailable == true) {
                len = inputStream?.getBuffer(buffer, length: sizeofValue(buffer))

                if (len) {
                    var output = String(NSString(bytes: buffer, length: sizeofValue(buffer), encoding: NSASCIIStringEncoding))

                }
            }
        }

您可以使用Array<UInt8>作为缓冲区并按原样传递记录在使用 Swift 与 Cocoa 和 Objective-C 中 https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithCAPIs.html#//apple_ref/doc/uid/TP40014216-CH8-XID_15:

let bufferSize = 1024
var buffer = Array<UInt8>(count: bufferSize, repeatedValue: 0)

let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead >= 0 {
    var output = NSString(bytes: &buffer, length: bytesRead, encoding: NSUTF8StringEncoding)
} else {
    // Handle error
}

-[NSInputStream read:maxLength:]返回一个数字，指示读取了多少字节（如果 >= 0）或是否存在错误（如果为负）。您应该相应地检查返回值。