http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Miscellaneous/Foundation_Constants/Reference/reference.html
Foundation Constants Reference
NSError Codes
NSErrorcodes in the Cocoa error domain.
enum {NSFileNoSuchFileError= 4,NSFileLockingError= 255,NSFileReadUnknownError= 256,NSFileReadNoPermissionError= 257,NSFileReadInvalidFileNameError= 258,NSFileReadCorruptFileError= 259,NSFileReadNoSuchFileError= 260,NSFileReadInapplicableStringEncodingError= 261,NSFileReadUnsupportedSchemeError= 262,NSFileReadTooLargeError= 263,NSFileReadUnknownStringEncodingError= 264,NSFileWriteUnknownError= 512,NSFileWriteNoPermissionError= 513,NSFileWriteInvalidFileNameError= 514,NSFileWriteInapplicableStringEncodingError= 517,NSFileWriteUnsupportedSchemeError= 518,NSFileWriteOutOfSpaceError= 640,NSFileWriteVolumeReadOnlyError= 642mNSKeyValueValidationError= 1024,NSFormattingError= 2048,NSUserCancelledError= 3072,NSFileErrorMinimum= 0,NSFileErrorMaximum= 1023,NSValidationErrorMinimum= 1024,NSValidationErrorMaximum= 2047,NSFormattingErrorMinimum= 2048,NSFormattingErrorMaximum= 2559,NSPropertyListReadCorruptError= 3840,NSPropertyListReadUnknownVersionError= 3841,NSPropertyListReadStreamError= 3842,NSPropertyListWriteStreamError= 3851,NSPropertyListErrorMinimum= 3840,NSPropertyListErrorMaximum= 4095NSExecutableErrorMinimum= 3584,NSExecutableNotLoadableError= 3584,NSExecutableArchitectureMismatchError= 3585,NSExecutableRuntimeMismatchError= 3586,NSExecutableLoadError= 3587,NSExecutableLinkError= 3588,NSExecutableErrorMaximum= 3839, }
URL Loading System Error Codes
These values are returned as the error code property of anNSErrorobject with the domain “NSURLErrorDomain”.
typedef enum{NSURLErrorUnknown= -1,NSURLErrorCancelled= -999,NSURLErrorBadURL= -1000,NSURLErrorTimedOut= -1001,NSURLErrorUnsupportedURL= -1002,NSURLErrorCannotFindHost= -1003,NSURLErrorCannotConnectToHost= -1004,NSURLErrorDataLengthExceedsMaximum= -1103,NSURLErrorNetworkConnectionLost= -1005,NSURLErrorDNSLookupFailed= -1006,NSURLErrorHTTPTooManyRedirects= -1007,NSURLErrorResourceUnavailable= -1008,NSURLErrorNotConnectedToInternet= -1009,NSURLErrorRedirectToNonExistentLocation= -1010,NSURLErrorBadServerResponse= -1011,NSURLErrorUserCancelledAuthentication= -1012,NSURLErrorUserAuthenticationRequired= -1013,NSURLErrorZeroByteResource= -1014,NSURLErrorCannotDecodeRawData= -1015,NSURLErrorCannotDecodeContentData= -1016,NSURLErrorCannotParseResponse= -1017,NSURLErrorFileDoesNotExist= -1100,NSURLErrorFileIsDirectory= -1101,NSURLErrorNoPermissionsToReadFile= -1102,NSURLErrorSecureConnectionFailed= -1200,NSURLErrorServerCertificateHasBadDate= -1201,NSURLErrorServerCertificateUntrusted= -1202,NSURLErrorServerCertificateHasUnknownRoot= -1203,NSURLErrorServerCertificateNotYetValid= -1204,NSURLErrorClientCertificateRejected= -1205,NSURLErrorClientCertificateRequired= -1206,NSURLErrorCannotLoadFromNetwork= -2000,NSURLErrorCannotCreateFile= -3000,NSURLErrorCannotOpenFile= -3001,NSURLErrorCannotCloseFile= -3002,NSURLErrorCannotWriteToFile= -3003,NSURLErrorCannotRemoveFile= -3004,NSURLErrorCannotMoveFile= -3005,NSURLErrorDownloadDecodingFailedMidStream= -3006,NSURLErrorDownloadDecodingFailedToComplete= -3007}