macOS. How to get CPU temperature programmatically

Question

I need to get CPU temperature using Swift, but I can\'t find any information except for this.

I think that I should use IOKit.framework but again there\'s no much inform

Answer 1

using https://github.com/lavoiesl/osx-cpu-temp/blob/master/smc.c I got it to work. You have to do a few things:

Simplify main() to something else:

double calculate()
{
    SMCOpen();
    double temperature = SMCGetTemperature(SMC_KEY_CPU_TEMP);
    SMCClose();
    temperature = convertToFahrenheit(temperature);
    return temperature;
}

Write an ObjC wrapper:

#import "SMCObjC.h"
#import "smc.h"   
@implementation SMCObjC

+(double)calculateTemp {
    return calculate();
}

@end

Add the header to your Swift bridging header.

//
//  Use this file to import your target's public headers that you would like to expose to Swift.
//
#import "SMCObjC.h"

If the app is sandboxed, add a security exemption for AppleSMC:

    com.apple.security.app-sandbox
    
    com.apple.security.files.user-selected.read-only
    
    com.apple.security.temporary-exception.sbpl
    
        (allow iokit-open)
        (allow iokit-set-properties (iokit-property "AppleSMC"))
        (allow mach-lookup (global-name "com.apple.AssetCacheLocatorService"))
    

Call it from Swift.

import Cocoa

class ViewController: NSViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let temp = SMCObjC.calculateTemp()
        print("I got \(temp) in swift")
    }
}