Ordered comparison between pointer and zero ('const char *' and 'int')
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更新Xcode 9后原来的项目报错
之前忘了是改什么了虽然不报错，但是运行后连不上网。
今天试了把0 改为 (char *)0 可以了了 ，又试了其他的 (void *)NULL , (void *)0, 都可以了。
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