You can fix this by adding the -ObjC linker flag.  See related issue:
http://developer.apple.com/library/mac/#qa/qa2006/qa1490.html
This will force the linker to load classes from the static library


Another way is to reference the class directly somewhere in the code such that 
it has no effect, i.e.
[ClassINeed class];


        -Dan Treiman

On Feb 24, 2011, at 9:19 PM, Leon Qiao wrote:

> Dear all,
> 
> I got a problem when using the NSClassFromString method to get a class.
> The code is used in the google docs library. It failed to get the Class
> object, the return value is 0x0.
> But I already linked the library, and it works fine when using the class
> itself directly.
> Anyone who met the same problem, please help me. Thanks!
> 
> -- 
> Best regards
> Leon
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