获取程序Documents目录路径

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

获取程序app文件所在目录路径

NSHomeDirectory();

获取程序tmp目录路径

NSTemporaryDirectory();

获取程序应用包路径

[[NSBundle mainBundle] resourcePath];

或

[[NSBundle mainBundle] pathForResource: @"info" ofType: @"txt"];

来源：http://www.cnblogs.com/kaixuan/archive/2011/05/31/2064796.html