写入文件--cpp构建器 [英] Writing to a file - cpp builder

问题描述

您好。我只是创建了一个计算计算机运行时间的程序。我已经创建了一个时间计数器，但如果您在关闭计算机时可以自动保存Label的内容，则会出现问题（我的意思是该程序将单独保存Label的值，无需用户干预）。我很感激你的帮助。



我的尝试：



我正在寻求帮助，因为我不知道该怎么做。

Hello. I'm just creating a program that's supposed to count how long the computer is on. I have already created a counting of time, but there was a problem if you can save Label's content automatically when you shut down your computer (I mean that the program would save Label's value alone, without user intervention). I would be grateful for help.

What I have tried:

I am asking for help, because I have no idea how to do it.

推荐答案

参见 WM_QUERYENDSESSION消息 - Windows应用程序| Microsoft Docs [ ^ ]。

使用 GetTickCount64函数（sysinfoapi.h）| Microsoft Docs [ ^ ] - 它返回自Windows启动以来的毫秒数。它更加准确，因为Windows中的计时器仅在一段时间后而不是在一段时间内触发。例如，如果你使用计时器来计算秒数，那么当系统繁忙时它们会漂移很大。



请记住，虽然WM_QUERYENDSESSION会告诉你Windows即将关闭，拔出电源线不会有任何影响！

Instead of counting, use GetTickCount64 function (sysinfoapi.h) | Microsoft Docs[^] - it returns the milliseconds since Windows was started. It's a lot more accurate, since timers in Windows only fire "after a time period", not "on a time period". If you use timers to count seconds for example, they will drift quite significantly when the system is busy.

Remember that while WM_QUERYENDSESSION will tell you windows is about to close, it won't have any effect if the power cord is pulled out!

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