WinCe下获取系统时间的API函数（精确到ms级)

最新推荐文章于 2017-10-20 16:04:36 发布

原创最新推荐文章于 2017-10-20 16:04:36 发布 · 4.5k 阅读

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#wince #api #function #system #structure #timer

本文介绍了Windows Embedded CE 6.0中的timeGetTime函数，该函数用于获取自系统启动以来的时间（毫秒为单位）。文章对比了timeGetTime与timeGetSystemTime函数的区别，并提醒开发者注意timeGetTime返回值每49.71天重置为0的问题。

timeGetTime

Windows Embedded CE 6.0

This function retrieves the system time, in milliseconds. The system time is the time elapsed since the system started.

DWORD timeGetTime(void);

None.

Return Value

Returns the system time, in milliseconds.

Remarks

The only difference between this function and the timeGetSystemTime function is that timeGetSystemTime uses the MMTIME structure to return the system time. The timeGetTime function has less overhead than timeGetSystemTime.

The value returned by the timeGetTime function is a DWORD value.

The return value resets to zero every 2^32 milliseconds, which is about 49.71 days. This can cause problems in code that directly uses the timeGetTime return value in computations, particularly when the value is used to control code execution. Depending on how you are using the hardware timer, you may need to handle the timer reset condition.

Always use the difference between two timeGetTime return values in computations.

Requirements

Header

mmsystem.h

Library

Mmtimer.lib

Windows Embedded CE

Windows CE .NET 4.2 and later