Dropbox 如何实现这两个功能（更改图标并仅发送文件更改的差异。）
DropBox 是如何实现这两个功能的（高级答案即可）：
在 Windows 上同步后获取要更改的文件图标？ （我猜类似的答案也适用于其他操作系统）
仅发送对文件所做的更改而不是整个文件？
对于2，我猜测它是通过在客户端使用类似于 diff 的东西并发送输出来工作的......
How did DropBox implement these two features (a high-level answer is fine):
Get the icon of a file to change once it's synchronised on Windows? (I am guessing similar answers would apply to the other OSs)
Send only the changes done to a file and not the whole file?
For 2, I am guessing that it worked by using something similar to diff on the client side, and sending the output...
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至于第一个问题，它是使用 图标完成的覆盖处理程序。 codeproject 中有一个示例，您还可以查看精彩的 < a href="http://code.google.com/p/tortoisesvn/source/browse/trunk/src/TortoiseShell/IconOverlay.cpp" rel="nofollow">TortoiseSVN source，它实现了这样的处理程序。
As for the first question, it's done using an icon overlay handler. There's an example in codeproject, and you can also take a look at the great TortoiseSVN source, which implements such a handler.
仅发送对文件的修改是通过所谓的 滚动校验和/哈希 来完成的，这是一个示例可以远程比较文件并仅发送差异的程序是rsync。
Only sending modifications to a file is accomplished with something called a Rolling Checksum / Hash, an example of a program that can remotely diff a file and only send the differences is rsync.