如何檢測某個應用程序何時打開？

Question

在Applescript或Objective-C中，有一種方法可以檢測某個應用程序何時打開？我的目標是在我打算在每當「QuickTime Player」打開時顯示消息的應用程序中添加一項功能，但是我沒有在Apple開發人員文檔中找到任何顯示如何執行此操作的任何內容。

Answer 1

這對Objective-C非常簡單。下面的代碼：

註冊適當的通知從NSWorkspace：

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification 
{ 
    //Fetch the notification center from the workspace 
    NSNotificationCenter* center = [[NSWorkspace sharedWorkspace] notificationCenter]; 

    [center addObserver:self selector:@selector(newApplicationDidLaunch:) name:NSWorkspaceDidLaunchApplicationNotification object:nil]; 

    [center addObserver:self selector:@selector(newApplicationWillLaunch:) name:NSWorkspaceWillLaunchApplicationNotification object:nil]; 

} 

然後，添加您選擇的通知。通知的userInfo字典將包含您需要知道的所有內容：

-(void)newApplicationDidLaunch:(NSNotification*)notification { 

    NSDictionary* userInfo = notification.userInfo; 
    //Do what you want here after application launch. 
} 

-(void)newApplicationWillLaunch:(NSNotification*)notification { 

    NSDictionary* userInfo = notification.userInfo; 
    //Do what you want here to prepare for application launch. 
} 

希望有所幫助。