测量时间(以微秒为单位) [英] Measuring time in microseconds
问题描述
我需要创建一个函数，该函数在C#或C ++中以毫秒为单位测量时间.我如何使用Visual Studio 2008做到这一点?
I need to create a function that measures time in microseconds in C# or C++. How can I do that using Visual Studio 2008?
推荐答案
在使用C ++的嵌入式系统中，这通常很容易做到.但是，在Windows中则不是. :(
In embedded systems using C++, that''s often easily done. In Windows, however, it''s not. :(
您可以尝试以下操作，但是请记住，最接近的时间约为15到20毫秒(+/-几毫秒，具体取决于您的硬件):
You might try the following, but remember that the closest you''d get to would be something like 15 to 20 milliseconds (+/- a few milliseconds, depending on your hardware):
-
QueryPerformanceCounter():此函数将返回非常精确的时间计数，但是由于Windows不是实时操作系统，因此有时该计数没有意义.请注意，在某些情况下，计数甚至可能会倒退！ - 多媒体计时器功能:我从没使用过这些功能，只听说过它们.我知道它们的工作方式比
QueryPerformanceCounter()可靠一些，但是它们也有局限性.
QueryPerformanceCounter(): This function will return a time count that''s very precise, but because Windows isn''t a real-time operating system, sometimes the counts won''t make sense. I understand that the count can even seem to go backwards in some situations!- Multimedia Timer functions: I''ve never used these, only heard about them. I understand that they work somewhat more reliably than
QueryPerformanceCounter(), but they too have limitations.
如果要说的话，只需添加如果测量的时间只有微秒，恐怕Windows并非适合您的操作系统.只是不够准确.
Just to add, if you mean how to measure a SMALL number of microseconds, I''m afraid that Windows is not the OS for you. It''s just not that accurate.
C#或C ++.如何使用Visual Studio 2008做到这一点?
C# or C++. How can I do that using Visual Studio 2008?
Visual Studio的版本(或任何其他IDE)或尝试使用此语言的编程语言均无关紧要.
我之所以这样说，是因为Windows甚至无法提供毫秒的精度.微秒是毫秒精度的千倍倍，因此您需要放弃在Windows上尝试此操作.
而是选择一个RTOS.
The version of visual studio (or any other IDE), or the programming language that you may use to attempt this is irrelevant.
I say it because Windows can''t even give you the precision of milliseconds. Microseconds is a thousand times the precision of milliseconds, so you need to give up trying this on Windows.
Choose an RTOS instead.
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