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Re: understanding conversions between CF and NS datatypes
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Re: understanding conversions between CF and NS datatypes


  • Subject: Re: understanding conversions between CF and NS datatypes
  • From: Randall Meadows <email@hidden>
  • Date: Fri, 29 Aug 2008 13:22:53 -0600

On Aug 29, 2008, at 11:38 AM, Allen Curtis wrote:

I am writing a Cocoa application for accessing a serial device. (IOKit) In
order to do this, you need to translate between CF and NS data types. (I
believe)


For instance:
CFMutableArrayRef devicePaths = CFArrayCreateMutable(NULL, 0, NULL);


       GetSerialPortPaths(serialServices, devicePaths);  // Fills in
CFMutableArray
       serialPorts = (NSMutableArray *) devicePaths;
       //CFRelease(devicePaths);
       printf("Found %d serial ports\n", [serialPorts count]);

The problem: I found that if you release the CFMutableArray, you also loose
the NSMutableArray

Yep, because you're merely casting types, you're not creating a new object.


Question:
1. Where can I get a better understanding of the data conversion between
these different frameworks?

Does <http://developer.apple.com/documentation/Cocoa/Conceptual/CarbonCocoaDoc/Articles/InterchangeableDataTypes.html > help?


2. Ultimately the device path names will appear in a ComboBox. Was it
necessary to convert the CFMutableArray to a NSMutableArray for the
datasource function?

I don't know about "necessary", but it's certainly convenient, because then you can use the (IMO) more convenient accessors of NSArray.


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