objective-c - 如何以编程方式防止Mac进入休眠状态？

有没有办法防止Mac使用Objective-C以编程方式进入睡眠状态？ Apple开发站点上的I / O套件基础知识部分告诉我，驱动程序会收到有关空闲/系统睡眠的通知，但我找不到防止系统睡眠的方法。可能吗？

我遇到了一些其他使用Caffeine，Jiggler，sleepless甚至AppleScript的解决方案，但是我想在Objective-C中做到这一点。谢谢。

最佳答案

这是Apple的官方文档(包括代码片段):
Technical Q&A QA1340 - How to I prevent sleep?

Quote:在Mac OS X 10.6 Snow Leopard中使用I / O Kit防止睡眠:

#import <IOKit/pwr_mgt/IOPMLib.h>

// kIOPMAssertionTypeNoDisplaySleep prevents display sleep,
// kIOPMAssertionTypeNoIdleSleep prevents idle sleep

// reasonForActivity is a descriptive string used by the system whenever it needs
// to tell the user why the system is not sleeping. For example,
// "Mail Compacting Mailboxes" would be a useful string.

// NOTE: IOPMAssertionCreateWithName limits the string to 128 characters.
CFStringRef* reasonForActivity= CFSTR("Describe Activity Type");

IOPMAssertionID assertionID;
IOReturn success = IOPMAssertionCreateWithName(kIOPMAssertionTypeNoDisplaySleep,
                                    kIOPMAssertionLevelOn, reasonForActivity, &assertionID);
if (success == kIOReturnSuccess)
{
    //  Add the work you need to do without
    //  the system sleeping here.

    success = IOPMAssertionRelease(assertionID);
    //  The system will be able to sleep again.
}

对于较旧的OSX版本，请检查以下内容:
Technical Q&A QA1160 - How can I prevent system sleep while my application is running?

Quote:使用UpdateSystemActivity的示例(

#include <CoreServices/CoreServices.h>

void
MyTimerCallback(CFRunLoopTimerRef timer, void *info)
{
    UpdateSystemActivity(OverallAct);
}


int
main (int argc, const char * argv[])
{
    CFRunLoopTimerRef timer;
    CFRunLoopTimerContext context = { 0, NULL, NULL, NULL, NULL };

    timer = CFRunLoopTimerCreate(NULL, CFAbsoluteTimeGetCurrent(), 30, 0, 0, MyTimerCallback, &context);
    if (timer != NULL) {
        CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes);
    }

    /* Start the run loop to receive timer callbacks. You don't need to
    call this if you already have a Carbon or Cocoa EventLoop running. */
    CFRunLoopRun();

    CFRunLoopTimerInvalidate(timer);
    CFRelease(timer);

    return (0);
}

关于objective-c - 如何以编程方式防止Mac进入休眠状态？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/5596319/