Cocoa 小数和协议缓冲区，与 .NET 兼容
我一直在使用 CocoaTouch 编写的 iOS 应用程序中使用 Protocol Buffers，并且遇到了可能相当于十进制数字的菜鸟错误。
Protocol Buffers 没有原生十进制类型 - 请参阅 http://code .google.com/apis/protocolbuffers/docs/proto.html#scalar 适用于所有类型。相反，我做出了（现在显然是错误的）假设：浮点数可以代替小数。事实并非如此，因为存在舍入问题。
Cocoa 在 NSDecimal.h 中有一组 C 函数，看起来很有吸引力。然而，由于我正在与使用 .NET 编写的代码的服务器进行通信，因此我需要一种方法来转换两个系统都可以理解的格式。
我假设我会使用原始“字节”类型在两个系统之间传输数据，并在每个环境中转换为本机十进制类型：Cocoa 端的 NSDecimal，.NET 端的 Decimal。正是在这里，我不清楚如何继续。
我应该使用什么中间格式 - 二进制编码的十进制似乎是一种可能性，但我必须自己实现一种算法才能在两个系统上进行转换。
是否有一种我可以使用 .NET 和 Cocoa 都支持的字节编码十进制格式？
非常感谢。
I've been working with Protocol Buffers with an iOS app written using CocoaTouch and have run into what probably amounts to a rookie mistake with decimal numbers.
Protocol Buffers does not have a native decimal type - see http://code.google.com/apis/protocolbuffers/docs/proto.html#scalar for all the types. Instead I made the (now obviously incorrect) assumption that a floating point number would work in place of a decimal. It does not, as there are rounding problems.
Cocoa has a set of C functions in NSDecimal.h which look appealing to use instead. However since I'm communicating with a server which has code written in .NET, I am going to need a way to convert to and from a format that both systems can understand.
I assume I would use the raw "bytes" type to transfer the data between the two systems and convert to the native decimal type in each environment: NSDecimal on the Cocoa side, Decimal on the .NET side. It is here that I am unclear on how to proceed.
What intermediate format should I use - binary coded decimals seem like one possibility but I would have to implement an algorithm myself to convert on both systems.
Is there one byte-coded decimal format that both .NET and Cocoa speak that I could use?
Many thanks.
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
我随机为 protobuf-net 拼凑了一个相当任意的格式，它映射到 .NET
decimal类型 - 布局 在这里。这对于 .NET 到 .NET 很有效，但我对 Cocoa 小数了解不够，不知道它是如何适合的。I randomly hacked together a fairly arbitrary format for protobuf-net, that maps to the .NET
decimaltype - the layout is here. This works well for .NET-to-.NET, but I do't know enough about Cocoa decimals to know how that fits.