調整Mac顯示屏亮度Objective-C？

Question

有沒有辦法在Objective-C中調整Mac的顯示亮度？我有敏感的眼睛，有時候顯示器看起來可能會變暗。與Jeff's blog post關於極客和黑暗相結合，它可以變得非常討厭。

我認爲這是有原因的，如果顯示器可以設置爲數字值，它可以設置爲低於常規屏幕亮度。我已經Google了谷歌，但所有的事情都是關於iPhone的。有沒有辦法爲Mac做到這一點？

Answer 1

只是搜索一下，發現這:) :)

這是代碼如何獲得亮度。

// almost completely from: http://mattdanger.net/2008/12/adjust-mac-os-x-display-brightness-from-the-terminal/ 
- (float) get_brightness { 
    CGDirectDisplayID display[kMaxDisplays]; 
    CGDisplayCount numDisplays; 
    CGDisplayErr err; 
    err = CGGetActiveDisplayList(kMaxDisplays, display, &numDisplays); 

    if (err != CGDisplayNoErr) 
     printf("cannot get list of displays (error %d)\n",err); 
    for (CGDisplayCount i = 0; i < numDisplays; ++i) { 


     CGDirectDisplayID dspy = display[i]; 
     CFDictionaryRef originalMode = CGDisplayCurrentMode(dspy); 
     if (originalMode == NULL) 
      continue; 
     io_service_t service = CGDisplayIOServicePort(dspy); 

     float brightness; 
     err= IODisplayGetFloatParameter(service, kNilOptions, kDisplayBrightness, 
             &brightness); 
     if (err != kIOReturnSuccess) { 
      fprintf(stderr, 
        "failed to get brightness of display 0x%x (error %d)", 
        (unsigned int)dspy, err); 
      continue; 
     } 
     return brightness; 
    }  
    return -1.0;//couldn't get brightness for any display 
} 

如何設置亮度。

// almost completely from: http://mattdanger.net/2008/12/adjust-mac-os-x-display-brightness-from-the-terminal/ 
- (void) set_brightness:(float) new_brightness { 
    CGDirectDisplayID display[kMaxDisplays]; 
    CGDisplayCount numDisplays; 
    CGDisplayErr err; 
    err = CGGetActiveDisplayList(kMaxDisplays, display, &numDisplays); 

    if (err != CGDisplayNoErr) 
     printf("cannot get list of displays (error %d)\n",err); 
    for (CGDisplayCount i = 0; i < numDisplays; ++i) { 


     CGDirectDisplayID dspy = display[i]; 
     CFDictionaryRef originalMode = CGDisplayCurrentMode(dspy); 
     if (originalMode == NULL) 
      continue; 
       io_service_t service = CGDisplayIOServicePort(dspy); 

     float brightness; 
     err= IODisplayGetFloatParameter(service, kNilOptions, kDisplayBrightness, 
             &brightness); 
     if (err != kIOReturnSuccess) { 
      fprintf(stderr, 
        "failed to get brightness of display 0x%x (error %d)", 
        (unsigned int)dspy, err); 
      continue; 
     } 

     err = IODisplaySetFloatParameter(service, kNilOptions, kDisplayBrightness, 
             new_brightness); 
     if (err != kIOReturnSuccess) { 
      fprintf(stderr, 
        "Failed to set brightness of display 0x%x (error %d)", 
        (unsigned int)dspy, err); 
      continue; 
     } 

     if(brightness > 0.0){ 
     }else{ 
     } 
    }  

} 

我在這裏找到了 - http://www.alecjacobson.com/weblog/?tag=brightness。