如何获取当前带宽（下载）速度？
如何使用 IdTCPServer 或 IdTCPClient 获取当前带宽速度？
我想知道，客户端从服务器下载数据的速度有多快？
例如：下载速度：450 kbps
How to get current bandwith speed using IdTCPServer or IdTCPClient ?
I want to know, how fast client is downloading data from server ?
e.g.: Downloading speed: 450 kbps
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将处理程序分配给连接的
TIdTCPConnection对象的OnWorkBegin、OnWork和OnWorkEnd事件。OnWorkBegin事件有一个AWorkCountMax参数，该参数为您提供预计传输的总字节数（如果提前知道）。OnWork事件有一个AWorkCount参数，可提供自触发OnWorkBegin事件以来实际传输的字节总数。每当触发
OnWork事件时，从当前AWorkCount值中减去先前的AWorkCount值，以确定两个事件之间已传输了多少字节，然后将该值除以两个事件之间经过的时间量。利用该最终值，您可以根据需要计算 b/sec、kb/sec、mb/sec 等。根据您发送/接收数据的具体方式，您可能需要手动调用
TIdTCPConnection的BeginWork()和EndWork()方法让OnWork...事件开始触发。大多数 Indy 的读/写方法不会在内部调用Begin/EndWork()。Assign handlers to the
OnWorkBegin,OnWork, andOnWorkEndevents of the connection'sTIdTCPConnectionobject. TheOnWorkBeginevent has anAWorkCountMaxparameter that gives you the total expected bytes being transfered (if known ahead of time). TheOnWorkevent has anAWorkCountparameter that gives you a running total of how many bytes have actually been transferred since theOnWorkBeginevent was fired.Whenever the
OnWorkevent is fired, subtract the previousAWorkCountvalue from the currentAWorkCountvalue to determine how many bytes have been transferred between the two events, and then divide that value by the amount of time that has elapsed between the two events. With that final value, you can calculate b/sec, kb/sec, mb/sec, etc as needed.Depending on how exactly you are sending/receiving your data, you may have to manually call the
BeginWork()andEndWork()methods ofTIdTCPConnectionto get theOnWork...events to start firing. Most of Indy's read/write methods do not callBegin/EndWork()internally.