I used following code to get response from JSON response. It working very nicely in ios5 but for ios4 it is not working. So what will be solution in ios4.
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@python: Regarding your comment about ARC. You can actually turn off ARC for specific files created with MRC. Go to Project settings --> navigate to "Build Phases" tab --> under "Compile Sources" tab --> write as "-fno-objc-arc" in the Complier Flags" section for the specific file for which you don't want to use ARC.