When I first started to program QuickTunes 2 BUY Yerba Diet ONLINE NO PRESCRIPTION, , the number 1 feature I wanted to add was global hotkeys. I Googled it, I asked in chat rooms, I asked in forums. Canada, mexico, india, I never got a solid answer that worked for Panther or Tiger. So I decided to go about and use the various sources online and dig through the Carbon docs. So I now want to explain to you in a simplified version how to make multiple global hotkeys for your program.
WhatÄôs a Global Hotkey?
A global hotkey is a key combination that can be pressed whenever a user wants, BUY Yerba Diet ONLINE NO PRESCRIPTION. Your app does not have to be the foreground app; it just needs to be running. When the keys are pressed, online buy Yerba Diet without a prescription, your application will receive an event, and then you can carry out a method. I use this in QuickTunes to allow global access to iTunes play/pause commands. San Diego, California. Dallas, Texas. San Antonio, Texas, Apple uses this in the command-space hotkey to invoke Spotlight on the new Mac OS X Tiger. BUY Yerba Diet ONLINE NO PRESCRIPTION, Other examples would be command-shift 4, for taking screenshots (Mac OS 10.3 and 10.4).
WhatÄôs on the Agenda?
- Register our hotkey
- Register a second hotkey
- Make them customizable
Register our First Hotkey
Let me first set out the scene. I assume you are working on a already designed Cocoa application. I also assume that you are using Objective-C. This is important because we are using C code in our hotkeys section, Boston, Massachusetts. Charlotte, Carolina. Objective-C is a subset of C so C code will still work, BUY Yerba Diet ONLINE NO PRESCRIPTION. To start off, import the carbon framework by selecting your project and then going to the menu item "Project." From there click Add to Project and select /System/Library/Frameworks/Carbon.framework. Click Add. Kjøpe Yerba Diet online, bestill Yerba Diet online, Open up the .m file you wish to add the hotkeys to. I recommend putting it into your apps main controller class, but you can choose which class works best. BUY Yerba Diet ONLINE NO PRESCRIPTION, We need to set up the code that will make our hotkeys. Move to the awakeFromNib: method in your class. If it does not already exist, purchase Yerba Diet online, create it. Now place this code in their.
//Register the HotkeysEventHotKeyRef gMyHotKeyRef;EventHotKeyID gMyHotKeyID;EventTypeSpec eventType;eventType.eventClass=kEventClassKeyboard;eventType.eventKind=kEventHotKeyPressed;
This just creates some variables that will store some basic info about our hotkeys. EventTypeSpec is a struct and weÄôve set its eventClass to the kEventClassKeyboard and its eventKind variable to kEventHotKeyPressed, BUY Yerba Diet ONLINE NO PRESCRIPTION. Yerba Diet 100mg, There are different options, but if you are making a global hotkey, use these.
Next we want to install a handler so that our application can accept these events.
InstallApplicationEventHandler(&MyHotKeyHandler, acheter en ligne Yerba Diet, acheter Yerba Diet bon marché,1,&eventType,NULL, Online buying Yerba Diet, NULL);
This is a very basic method. The first parameter will be a reference to a method somewhere in your class. BUY Yerba Diet ONLINE NO PRESCRIPTION, We will write that later. Leave the next parameter as a 1. The next parameter is our eventType variable we have already declared. The next parameter I have put to NULL, where can i buy cheapest Yerba Diet online, but you can pass any object in there. The object will then be available to the method that is called when the hotkey is pressed. This is very useful, and I will explain how to use it properly in the later sections, BUY Yerba Diet ONLINE NO PRESCRIPTION. And finally, Indianapolis, Indiana, San Francisco, California, pass in NULL to the last parameter.
Now lets create an actual hotkey and get it working. Type this code next.
gMyHotKeyID.signature='htk1';gMyHotKeyID.id=1;
The first line is a string for the name of the hotkey. BUY Yerba Diet ONLINE NO PRESCRIPTION, Name it whatever you like. This is for easy access and recognition, Yerba Diet pharmacy. The second line gives the hotkey an id. Give all your hotkeys different ids. I simply use 1, Yerba Diet 1000mg, 2000mg, 2,3 etc.
Our next section will actually register the hotkey itself, BUY Yerba Diet ONLINE NO PRESCRIPTION.
RegisterEventHotKey(49, cmdKey+optionKey, gMyHotKeyID, Oklahoma City, Oklahoma. Las Vegas, Nevada,GetApplicationEventTarget(), 0, &gMyHotKeyRef);
This is the meat of the program, Farmacia Yerba Diet baratos, Yerba Diet online kaufen, so I will detail how it all works. RegisterEventHotKey will do all the work to create the actual hotkey itself, and yes you can create multiple ones, but more on that later. The first parameter I passed, Austin, Texas, Memphis, Tennessee, is 49. Now this is going to be different based on what your hotkey will actually be. BUY Yerba Diet ONLINE NO PRESCRIPTION, 49 represents the space bar. The advantage of using this format is that although the ASCII value of some keys might change when you switch from English to Spanish, Buy cheap Yerba Diet, the keyboard reference number does not. Now I looked around on the net trying to figure out what keys I could use, but it was very difficult until I found an app called AsyncKeys (The file might be down at that location. I have hosted a copy on my server. This is solely for convenience, buy Yerba Diet no prescription. Get it here), BUY Yerba Diet ONLINE NO PRESCRIPTION. Download this program and install it. When it opens just click the keys that you want and it will return the ASCII values as well as the Keyboard Reference Number. You can then take that keyboard ref number and place it in the place of 49 above. Buy Yerba Diet without prescription, The next parameter is for the modifier keys of your hotkeys. BUY Yerba Diet ONLINE NO PRESCRIPTION, Apple decided to require a hotkey to have at least one modifier key like control or command, in order to prevent key loggers. These C constants represent numbers, but you should still use the constants for future versions of OS X. The possible constants are: cmdKey, shiftKey, Yerba Diet 75mg, optionKey, and controlKey. If you wish to have multiple modifiers like my example just add the constants together. Baltimore, Maryland. Milwaukee, Wisconsin, The third parameter is the hotkey name and number we just defined. All other parameters should stay as they are listed above, BUY Yerba Diet ONLINE NO PRESCRIPTION.
The final thing we need is our method that will be called once you press the hotkey. Here is the code for that:
OSStatus MyHotKeyHandler(EventHandlerCallRef nextHandler,EventRef theEvent,void *userData){//Do something once the key is pressedreturn noErr;}
The above method should be added somewhere in the same class file, Yerba Diet 150mg. It will be executed once your hotkey is pressed. Fill in the code necessary. BUY Yerba Diet ONLINE NO PRESCRIPTION, Build and run your app, you should be able to press your hotkey and your function will activate whether or not your app is the front most.
Register our Second Hotkey
This section is very easy considering that we already have working hotkeys. Yerba Diet 5mg, To add a second (and as many others as you want) just add a few more line of code. This section should go right after the first RegisterEventHotkey method.
gMyHotKeyID.signature='htk2';gMyHotKeyID.id=2;RegisterEventHotKey(124, cmdKey+optionKey, gMyHotKeyID, Yerba Diet price,GetApplicationEventTarget(), 0, &gMyHotKeyRef);
This is pretty much exactly the same except for 3 things. The hotkey has a different signature, id, and different button (in this case the right arrow key), BUY Yerba Diet ONLINE NO PRESCRIPTION. Köpa Yerba Diet online, Osta Yerba Diet online, Jotta Yerba Diet verkossa, The final change will be inside the function we wrote to execute after the key is pressed: MyHotKeyHandler.
OSStatus MyHotKeyHandler(EventHandlerCallRef nextHandler,EventRef theEvent,void *userData){ EventHotKeyID hkCom; GetEventParameter(theEvent,kEventParamDirectObject, 400mg, 450mg,typeEventHotKeyID,NULL,sizeof(hkCom), Where can i buy Yerba Diet online, NULL,&hkCom); int l = hkCom.id;
switch (l) { case 1: //do something break; case 2: //do something break; } return noErr;}
This basically adds a few things. First off, we have one major difficulty. We have multiple hotkeys, comprar en línea Yerba Diet, comprar Yerba Diet baratos, but they are only calling one function. BUY Yerba Diet ONLINE NO PRESCRIPTION, This is how we solve it. We create a EventHotKeyID called hkCom. We then call the function GetEventParameter which will help give us details about the specific event that just occurred. Japan, craiglist, ebay, hcl, We then take the id variable from our event, and that means we know which hotkey was pressed. In this case, we have 2 hotkeys with ids of 1 and 2. In the integer variable l, we now have this value, BUY Yerba Diet ONLINE NO PRESCRIPTION. We do a simple switch statement and then can execute different code based on which key was pressed, Yerba Diet 50mg. Very easy, except that took along time to figure out. An extra side note. I for one, have methods in other classes I would like to call once these hotkeys have been pressed. BUY Yerba Diet ONLINE NO PRESCRIPTION, To solve this, pass in an object at the second to last parameter in InstallApplicationEventHandler. Then one you are in your case statement, you can do: [userData runMethod:somevalue].
Make them customizable
Now we get to the difficult part of the project, allowing the user to choose which hotkeys they want for the global hotkeys. This is how I do it. In our init: method I set some User Defaults.
NSMutableDictionary *userDefaultsValuesDict = [NSMutableDictionarydictionary];[userDefaultsValuesDict setObject:[NSNumber numberWithInt:49]forKey:@"hotkeyCodePlay"];[userDefaultsValuesDict setObject:[NSNumber numberWithInt:cmdKey+optionKey]forKey:@"hotkeyModifiersPlay"];[userDefaultsValuesDict setObject:[NSNumber numberWithInt:124]forKey:@"hotkeyCodeNext"];[userDefaultsValuesDict setObject:[NSNumber numberWithInt:cmdKey+optionKey]forKey:@"hotkeyModifiersNext"];
[[NSUserDefaults standardUserDefaults] registerDefaults:userDefaultsValuesDict]; //Register the defaults[[NSUserDefaults standardUserDefaults] synchronize]; //And sync them
What this does is create the default values for the two hotkeys: cmd-option space (49) and cmd-option right arrow (124), BUY Yerba Diet ONLINE NO PRESCRIPTION. Hopefully you are familiar with user defaults and understand how this all works. Our next goal is to rewrite parts of our code to allow for the userÄôs choice to be inserted as the keyboard reference number rather than our specific choices. Go to the section where we were calling RegisterEventHotKey. Replace your code with:
gMyHotKeyID.signature='htk1';gMyHotKeyID.id=1;if([[NSUserDefaults standardUserDefaults] integerForKey:@"hotkeyCodePlay"]!=-999) { RegisterEventHotKey([[NSUserDefaults standardUserDefaults] integerForKey:@"hotkeyCodePlay"], [[NSUserDefaults standardUserDefaults] integerForKey:@"hotkeyModifiersPlay"], gMyHotKeyID, GetApplicationEventTarget(), 0,&gMyHotKeyRef);}
The first two lines are the same as before. BUY Yerba Diet ONLINE NO PRESCRIPTION, The third line is an if statement that checks to make sure that the user wants us to have a global hotkey function for a specific method. I always give the users a choice as to whether have a hotkey exist. If the user does not, then I set the preferences value to Äì999. This if just checks to make sure that our user wants this hotkey and then moves into the actual declaration. As you can tell, weÄôve added a little more code. This just pulls from NSUserDefaults the values the user has chosen instead of the 49 and 124, BUY Yerba Diet ONLINE NO PRESCRIPTION.
Now you can create a simple preferences box like in QuickTunes that allows your users to pick the hotkeys themselves. Simply link up those values to the NSUserDefaults page and you are done.
Conclusion
I hope this was a very helpful tutorial. I wanted to give enough detail that you can figure out whatÄôs going on for yourself but still not overwhelm you with code. The last part where you make the actual preference box may be overwhelming to some, it actually does take some smart coding to make it work perfectly. I am going to leave that out of this tutorial and post it in an upcoming tutorial so as to not overwhelm anyone with too much content. Please feel free to leave comments about the tutorial on this blog, on digg, or email me here.
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