What is event that stop function sleep in mfc C++?

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I need to have an even6t that stops sleep but I don't know what, I sa3w that event keyDown don't stop sleeo, how can I do?

What I have tried:

I tried to evoid sleep but I need it

Posted 5-Feb-20 5:40am

Member 14594285

Updated 5-Feb-20 6:24am

v2

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2 solutions

Solution 1

CEvent MFC class. CEvent::ResetEvent() puts a thread function into sleep state and CEvent::SetEvent() wakes up function.
CEvent::PulseEvent() sets event to avalable and then unavailable.

Microsoft documentation:

[^]

Posted 5-Feb-20 5:59am

steveb

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Member 14594285 5-Feb-20 12:08pm

mmmm..I saw documentation but it isn't very clear, so in setEvent I can put keyDown event like event that wakes program? Help

steveb 5-Feb-20 12:14pm

keyDown in MFC is CWnd::OnKeyDown() of WM_KEYDOWN message handler. Put your SetEvent call into that message handler

Member 14594285 6-Feb-20 2:53am

How must I do? Can I see an example?

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Rick York · Accepted Answer · 2020-02-05T06:24:00

Solution 2

Yes, you definitely want to avoid calling Sleep because there is nothing I am aware of that will stop it - it can not be interrupted.

You are better off waiting for an event using the CEvent class as mentioned. You can then call WaitForSingleObject or WaitForMultipleObjects and let it handle the "sleeping" for you.

Posted 5-Feb-20 6:24am

Rick York

Comments

Member 14594285 6-Feb-20 2:54am

How must I do? Can I see an example?

Rick York 6-Feb-20 11:19am

steveb's comment above had the hint for you. To use WaitForSingleObject you must pass it an object to wait for. That can be any 'handle' object that can be signalled. In your case, you need to declare an event object (CEvent or similar) accessible to the class that receives the keyboard messages and set the event when a key is pressed.

Member 14594285 6-Feb-20 3:25am

I wrote:

for (int i = 0; i <= 20; i++)

{
Sleep(100);
WaitForSingleObject(OnKeyDown, 100);
...

but I have errors

Member 14594285 6-Feb-20 12:04pm

so CEvent a = OnKeyDown? I don't understand..sorry but it's the first time for me