2

当您单击“显示”系统偏好设置窗格中的“检测显示”时,我正在尝试触发系统所做的相同操作。有没有办法以编程方式做到这一点?我的目标是创建一个 LaunchAgent,它在登录时执行此操作以重置显示分辨率,以防用户弄乱它。

4

2 回答 2

4

由于CGDisplayIOServicePort在 OS X 10.9 Mavericks 中已弃用该调用,因此最好通过适当的匹配调用获取 IOFramebuffer 服务,如下所示:

void triggerDetectDisplays()
{
    // loop over all IOFramebuffer services
    CFMutableDictionaryRef matchingDict = IOServiceMatching("IOFramebuffer");

    mach_port_t masterPort;
    IOMasterPort(MACH_PORT_NULL, &masterPort);
    io_iterator_t serviceIterator;
    IOServiceGetMatchingServices(masterPort, matchingDict, &serviceIterator);

    io_service_t obj = IOIteratorNext(serviceIterator);
    while (obj)
    {
        kern_return_t kr = IOServiceRequestProbe(obj, 0);
        obj = IOIteratorNext(serviceIterator);
    }
}
于 2013-12-10T19:51:41.917 回答
3

您将需要使用私有 CoreGraphics 例程来获取所有显示器的列表,包括非活动显示器,然后请求重新扫描总线。试试这样:

#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。

于 2010-01-18T23:11:53.143 回答