苹果相应的错误码

苹果相应的错误码如下：

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,  
    NSURLErrorInternationalRoamingOff = -1018,  
    NSURLErrorCallIsActive = -1019,  
    NSURLErrorDataNotAllowed = -1020,  
    NSURLErrorRequestBodyStreamExhausted = -1021,  
    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  
}