Swift - writing a byte stream to file [closed]

Answer 1

Basically the issue is going to be getting your data correctly converted to a pointer to get it to NSOutputStream.write. The following extension should do what you need:

extension NSOutputStream {
    enum WriteErrors : ErrorType {
        case UTF8ConversionFailed
    }

    func write(string:String) throws -> Int {
        guard let data = string.dataUsingEncoding(NSUTF8StringEncoding) else {
            throw WriteErrors.UTF8ConversionFailed
        }

        return write(UnsafePointer(data.bytes), maxLength: data.length)
    }

    func write(var i:Int32) throws -> Int {
        return withUnsafePointer(&i) {
            self.write(UnsafePointer($0), maxLength: sizeof(Int32))
        }
    }
}

Note that writing raw binary data to a file is ill-advised, you should be standardizing the byte order first, but I leave that as an exercise for the reader.