These values are returned as the error code property of an NSError object with the domain “NSURLErrorDomain”.
Available in Mac OS X v10.2 and later.
Declaration Syntax| C# | Visual Basic | Visual C++ |
public enum NSURLLoadingSystemErrorCode
Public Enumeration NSURLLoadingSystemErrorCode
public enum class NSURLLoadingSystemErrorCode
Members| Member | Description |
|---|---|
| NSURLErrorUnknown | Returned when the URL Loading system encounters an error that it cannot interpret. This can occur when an error originates from a lower level framework or library. Whenever this error code is received, it is a bug, and should be reported to Apple. Available in Mac OS X v10.2 and later. |
| NSURLErrorCancelled | Returned when an asynchronous load is canceled. A Web Kit framework delegate will receive this error when it performs a cancel operation on a loading resource. Note that an NSURLConnection or NSURLDownload delegate will not receive this error if the download is canceled. Available in Mac OS X v10.2 and later. |
| NSURLErrorBadURL | Returned when a URL is sufficiently malformed that a URL request cannot be initiated Available in Mac OS X v10.2 and later. |
| NSURLErrorTimedOut | Returned when an asynchronous operation times out. NSURLConnection will send this error to its delegate when the timeoutInterval in NSURLRequest expires before a load can complete. Available in Mac OS X v10.2 and later. |
| NSURLErrorUnsupportedURL | Returned when a properly formed URL cannot be handled by the framework. The most likely cause is that there is no available protocol handler for the URL. Available in Mac OS X v10.2 and later. |
| NSURLErrorCannotFindHost | Returned when the host name for a URL cannot be resolved. Available in Mac OS X v10.2 and later. |
| NSURLErrorCannotConnectToHost | Returned when an attempt to connect to a host has failed. This can occur when a host name resolves, but the host is down or may not be accepting connections on a certain port. Available in Mac OS X v10.2 and later. |
| NSURLErrorDataLengthExceedsMaximum | Returned when the length of the resource data exceeds the maximum allowed. Available in Mac OS X v10.5 and later. |
| NSURLErrorNetworkConnectionLost | Returned when a client or server connection is severed in the middle of an in-progress load. Available in Mac OS X v10.2 and later. |
| NSURLErrorDNSLookupFailed | See NSURLErrorCannotFindHost Available in Mac OS X v10.2 and later. |
| NSURLErrorHTTPTooManyRedirects | Returned when a redirect loop is detected or when the threshold for number of allowable redirects has been exceeded (currently 16). Available in Mac OS X v10.2 and later. |
| NSURLErrorResourceUnavailable | Returned when a requested resource cannot be retrieved. Examples are “file not found”, and data decoding problems that prevent data from being processed correctly. Available in Mac OS X v10.2 and later. |
| NSURLErrorNotConnectedToInternet | Returned when a network resource was requested, but an internet connection is not established and cannot be established automatically, either through a lack of connectivity, or by the user's choice not to make a network connection automatically. Available in Mac OS X v10.2 and later. |
| NSURLErrorRedirectToNonExistentLocation | Returned when a redirect is specified by way of server response code, but the server does not accompany this code with a redirect URL. Available in Mac OS X v10.2 and later. |
| NSURLErrorBadServerResponse | Returned when the URL Loading system receives bad data from the server. This is equivalent to the “500 Server Error” message sent by HTTP servers. Available in Mac OS X v10.2 and later. |
| NSURLErrorUserCancelledAuthentication | Returned when an asynchronous request for authentication is cancelled by the user. This is typically incurred by clicking a “Cancel” button in a username/password dialog, rather than the user making an attempt to authenticate. Available in Mac OS X v10.2 and later. |
| NSURLErrorUserAuthenticationRequired | Returned when authentication is required to access a resource. Available in Mac OS X v10.2 and later. |
| NSURLErrorZeroByteResource | Returned when a server reports that a URL has a non-zero content length, but terminates the network connection “gracefully” without sending any data. Available in Mac OS X v10.2 and later. |
| NSURLErrorCannotDecodeRawData | Returned when content data received during an NSURLConnection request cannot be decoded for a known content encoding. Available in Mac OS X v10.5 and later. |
| NSURLErrorCannotDecodeContentData | Returned when content data received during an NSURLConnection request has an unknown content encoding. Available in Mac OS X v10.5 and later. |
| NSURLErrorCannotParseResponse | Returned when a response to an NSURLConnection request cannot be parsed. Available in Mac OS X v10.5 and later. |
| NSURLErrorFileDoesNotExist | Returned when a file does not exist. Available in Mac OS X v10.2 and later. |
| NSURLErrorFileIsDirectory | Returned when a request for an FTP file results in the server responding that the file is not a plain file, but a directory. Available in Mac OS X v10.2 and later. |
| NSURLErrorNoPermissionsToReadFile | Returned when a resource cannot be read due to insufficient permissions. Available in Mac OS X v10.2 and later. |
| NSURLErrorSecureConnectionFailed | Returned when an attempt to establish a secure connection fails for reasons which cannot be expressed more specifically. Available in Mac OS X v10.2 and later. |
| NSURLErrorServerCertificateHasBadDate | Returned when a server certificate has a date which indicates it has expired, or is not yet valid. Available in Mac OS X v10.2 and later. |
| NSURLErrorServerCertificateUntrusted | Returned when a server certificate is signed by a root server which is not trusted. Available in Mac OS X v10.2 and later. |
| NSURLErrorServerCertificateHasUnknownRoot | Returned when a server certificate is not signed by any root server. Available in Mac OS X v10.2 and later. |
| NSURLErrorServerCertificateNotYetValid | Returned when a server certificate is not yet valid. Available in Mac OS X v10.4 and later. |
| NSURLErrorClientCertificateRejected | Returned when a server certificate is rejected. Available in Mac OS X v10.4 and later. |
| NSURLErrorClientCertificateRequired | Returned when a client certificate is required to authenticate an SSL connection during an NSURLConnection request. Available in Mac OS X v10.6 and later. |
| NSURLErrorCannotLoadFromNetwork | Returned when a specific request to load an item only from the cache cannot be satisfied. This error is sent at the point when the library would go to the network accept for the fact that is has been blocked from doing so by the “load only from cache” directive. Available in Mac OS X v10.2 and later. |
| NSURLErrorCannotCreateFile | Returned when NSURLDownload object was unable to create the downloaded file on disk due to a I/O failure. Available in Mac OS X v10.2 and later. |
| NSURLErrorCannotOpenFile | Returned when NSURLDownload was unable to open the downloaded file on disk. Available in Mac OS X v10.2 and later. |
| NSURLErrorCannotCloseFile | Returned when NSURLDownload was unable to close the downloaded file on disk. Available in Mac OS X v10.2 and later. |
| NSURLErrorCannotWriteToFile | Returned when NSURLDownload was unable to write to the downloaded file on disk. Available in Mac OS X v10.2 and later. |
| NSURLErrorCannotRemoveFile | Returned when NSURLDownload was unable to remove a downloaded file from disk. Available in Mac OS X v10.2 and later. |
| NSURLErrorCannotMoveFile | Returned when NSURLDownload was unable to move a downloaded file on disk. Available in Mac OS X v10.2 and later. |
| NSURLErrorDownloadDecodingFailedMidStream | Returned when NSURLDownload failed to decode an encoded file during the download. Available in Mac OS X v10.2 and later. |
| NSURLErrorDownloadDecodingFailedToComplete | Returned when NSURLDownload failed to decode an encoded file after downloading. Available in Mac OS X v10.2 and later. |
Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)