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我如何将这个 PGMidi 示例代码翻译成 RubyMotion？MIDIPacketList 的文档提到了特殊的警告，我不确定如何在 RubyMotion 中解释它们。例子：

请注意，列表中的数据包虽然定义为数组，但可能无法作为数组访问，因为它们是可变长度的。

就我在翻译中得到的而言，这是示例，并且更进一步：

- (void) midiSource:(PGMidiSource*)midi midiReceived:(const MIDIPacketList *)packetList
{
    [self performSelectorOnMainThread:@selector(addString:)
                           withObject:@"MIDI received:"
                        waitUntilDone:NO];

    const MIDIPacket *packet = &packetList->packet[0];
    for (int i = 0; i < packetList->numPackets; ++i)
    {
        [self performSelectorOnMainThread:@selector(addString:)
                               withObject:StringFromPacket(packet)
                            waitUntilDone:NO];
        packet = MIDIPacketNext(packet);
    }
}

我知道我正在丢失使用“packet”本地变量和“packetList”引用/取消引用的指针，但我很难弄清楚如何纠正它：

def midiSource(midi, midiReceived:packetList)
  self.performSelectorOnMainThread('addString',
                   withObject:'MIDI received:',
                   waitUntilDone:false)

  packet = packetList.packet[0]
  i = 0
  while i < packetList.numPackets
    i += 1

    self.performSelectorOnMainThread('addString',
                                     withObject:stringFromPacket(packet),
                                     waitUntilDone:false)
    packet = MIDIPacketNext(packet)
  end
end

感谢您的任何指导！

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1 回答 1

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如果它正在处理您正在寻找的指针，RubyMotion 会提供Pointer该类。http://www.rubymotion.com/developer-center/guides/runtime/#_pointers

于 2013-12-11T01:34:20.237 回答