当当前应用程序在Cocoa中更改时获取通知 [英] Getting notified when the current application changes in Cocoa

问题描述

我想在当前应用程序更改时收到通知。我看了看NSWorkspace。只有当您自己的应用程序变为活动或失去活动时，它才会发送通知。
我想知道每个应用程序。我可以在Cocoa做这个吗？

I want to be notified when the current application will change. I looked at NSWorkspace. It will send notifications only when your own application becomes active or loses the activity. I want to be informed about every application. How can I do this in Cocoa?

推荐答案

谢谢Jason。
在Carbon Event Manager中的kEventAppFrontSwitched是神奇的词

Thank you Jason. kEventAppFrontSwitched in Carbon Event Manager is the magic word

- (void) setupAppFrontSwitchedHandler
{
    EventTypeSpec spec = { kEventClassApplication,  kEventAppFrontSwitched };
    OSStatus err = InstallApplicationEventHandler(NewEventHandlerUPP(AppFrontSwitchedHandler), 1, &spec, (void*)self, NULL);

    if (err)
        NSLog(@"Could not install event handler");
}

- (void) appFrontSwitched {
    NSLog(@"%@", [[NSWorkspace sharedWorkspace] activeApplication]);
}

和处理程序

static OSStatus AppFrontSwitchedHandler(EventHandlerCallRef inHandlerCallRef, EventRef inEvent, void *inUserData)
{
    [(id)inUserData appFrontSwitched];
    return 0;
}

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