以编程方式触发“检测显示". [英] Programmatically trigger "detect displays."

问题描述

我正在尝试触发与您单击检测显示"时系统所做的相同的操作.在展示"中系统偏好设置窗格.有没有办法以编程方式执行此操作?我的目标是创建一个LaunchAgent，在登录时执行此操作，以重置显示分辨率，以防用户弄乱它.

I’m trying to trigger the same thing that the system does when you click on “Detect Displays” in the “Displays” System Preferences pane. Is there a way to do this programmatically? My goal is to create a LaunchAgent that does this at login to reset the display resolution in case a user messes with it.

推荐答案

您将需要使用私有的CoreGraphics例程来获取所有显示(包括非活动显示)的列表，然后请求重新扫描总线.像这样尝试:

You will need to use a private CoreGraphics routine to get the list of all displays including inactive ones, and then request a rescan of the bus. Try it like this:

#include <IOKit/IOKitLib.h>
#include <IOKit/IOTypes.h>

CGDisplayErr CGSGetDisplayList(CGDisplayCount maxDisplays,
                                    CGDirectDisplayID * onlineDspys,
                                    CGDisplayCount * dspyCnt);
static void DetectDisplays()
{
 CGDirectDisplayID    displays[8];
    CGDisplayCount  dspCount = 0;

 if (CGSGetDisplayList(8, displays, &dspCount) == noErr)
 {
  for(int i = 0; i < dspCount; i++)
  {
   io_service_t service = CGDisplayIOServicePort(displays[i]);
   if (service)
    IOServiceRequestProbe(service, kIOFBUserRequestProbe);
  }
 }
}

并链接到ApplicationServices和IOKit.

And link to ApplicationServices and IOKit.

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