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Re: Specifying primitive types in NSCoders
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Re: Specifying primitive types in NSCoders


  • Subject: Re: Specifying primitive types in NSCoders
  • From: Greg Scown <email@hidden>
  • Date: Sun, 30 Jun 2002 00:23:34 +0800

Here's one:

int version = 1;
[coder decodeValueOfObjCType:@encode(int) at:&version];

The @encode() allows you to specify primitive types by name rather than memorizing constants. It works similarly to @selector() which you've probably already encountered.

Greg Scown
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I'm sure this is a simple one, but I can't find any concrete examples of
how to specify primitive types in encoding and decoding methods.

For example:

- (void)decodeValueOfObjCType:(const char *)valueType at:(void *)data

What exactly do you pass into "valueType"?

Is Apple actually making us do something like this?

char floatConstant = 'f'
float floatValue;

[self decodeValueOfObjCType:&floatConstant at:&floatValue];

Don't they have constants defined for these?

I looked at NSCoder which tells you to look at chapter 4 in the Obj c
reference. Looking in Obj c reference it has a table of values, but no
examples of use and says look at NSCoder

Could someone provide a couple of quick examples for how to call encode
and decode for primitives
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