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IP*Works! V9
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JSON Control

Properties   Methods   Events   Configuration Settings   Errors  

The JSON Component can be used to easily integrate with web services that produce JSON output.

Syntax

JSON

Remarks

The JSON Control implements a standard JSON client .

The control contains a number of properties that map directly to HTTP request headers. All JSON data received is parsed by the control and provided to the user through properties such as XPath, XElement, XText, etc. which allow traversal of the document structure. The Header event will provide the HTTP headers as returned by the server.

To receive a document, call the Get method with the URL to retrieve specified in the URL parameter. The control will automatically parse the JSON data. Call the Delete method to delete a resource specified by the URL parameter.

The other two JSON operations are for creating and updating resources. Some people wish to use the Post method for creating resources and the Put method for updating resources. Others choose to use the methods vice versa, or just one for both operations. So, you can POST JSON data to the HTTP server by assigning it to the PostData property and then calling the Post method. Alternatively, you may use the PUT method instead.

To add authorization credentials to an outgoing request, you should specify the User and Password properties. The JSON Control supports Basic, Digest, and NTLM authentication through the AuthScheme property.

Property List


The following is the full list of the properties of the control with short descriptions. Click on the links for further details.

AcceptA list of acceptable MIME types for the request.
AuthorizationThe Authorization string to be sent to the server.
AuthSchemeThe authentication scheme to use when server authorization is required.
BuildDOMWhen True, an internal object model of the JSON document is created.
ConnectedShows whether the component is connected.
ContentTypeContent type for posts and puts.
CookieCountThe number of records in the Cookie arrays.
CookieDomainThe domain of a received cookie.
CookieExpirationThis property contains an expiration time for the cookie (if provided by the server).
CookieNameThe name of the cookie.
CookiePathThis property contains a path name to limit the cookie to (if provided by the server).
CookieSecureThis property contains the security flag of the received cookie.
CookieValueThis property contains the value of the cookie.
FirewallAutoDetectThis property tells the component whether or not to automatically detect and use firewall system settings, if available.
FirewallTypeThis property determines the type of firewall to connect through.
FirewallHostThis property contains the name or IP address of firewall (optional).
FirewallPasswordThis property contains a password if authentication is to be used when connecting through the firewall.
FirewallPortThis property contains the TCP port for the firewall Host .
FirewallUserThis property contains a user name if authentication is to be used connecting through a firewall.
FollowRedirectsDetermines what happens when the server issues a redirect.
FromThe email address of the HTTP agent (optional).
HTTPMethodThe HTTP method used for the request.
IdleThe current status of the component.
IfModifiedSinceA date determining the maximum age of the desired document.
LocalFileThe path to a local file for downloading. If the file exists, it is overwritten.
LocalHostThe name of the local host or user-assigned IP interface through which connections are initiated or accepted.
OtherHeadersOther headers as determined by the user (optional).
ParsedHeaderCountThe number of records in the ParsedHeader arrays.
ParsedHeaderFieldThis property contains the name of the HTTP header (same case as it is delivered).
ParsedHeaderValueThis property contains the header contents.
PasswordA password if authentication is to be used.
PostDataThe data to post with the URL if the POST method is used.
ProxyAuthSchemeThis property is used to tell the component which type of authorization to perform when connecting to the proxy.
ProxyAutoDetectThis property tells the component whether or not to automatically detect and use proxy system settings, if available.
ProxyPasswordThis property contains a password if authentication is to be used for the proxy.
ProxyPortThis property contains the TCP port for the proxy Server (default 80).
ProxyServerIf a proxy Server is given, then the HTTP request is sent to the proxy instead of the server otherwise specified.
ProxyUserThis property contains a user name, if authentication is to be used for the proxy.
RefererReferer URL/document (optional).
StatusLineThe first line of the last server response.
TimeoutA timeout for the component.
TransferredDataThe contents of the last response from the server.
TransferredDataLimitThe maximum of bytes of data to be transferred.
TransferredHeadersThe full set of headers as received from the server.
URLThe URL to post information to.
UserA user name if authentication is to be used.
XChildrenCountThe number of records in the XChild arrays.
XChildNameThe Name property provides the local name of the element.
XChildXTextThis property contains the inner text of the element.
XElementThe name of the current element.
XErrorPathAn XPath to check the server response for errors.
XParentThe parent of the current element.
XPathProvides a way to point to a specific element in the response.
XSubTreeA snapshot of the current element in the document.
XTextThe text of the current element.

Method List


The following is the full list of the methods of the control with short descriptions. Click on the links for further details.

AddCookieAdds a cookie and the corresponding value to the outgoing request headers.
ConfigSets or retrieves a configuration setting .
DeleteDeletes an object on the server.
DoEventsProcesses events from the internal message queue.
GetFetches the document.
HasXPathDetermines whether a specific element exists in the document.
InputProvides input to the parser.
InterruptInterrupt the current method.
ParseFileLoads a JSON file into the component.
PostPosts data to the HTTP server using the HTTP POST method.
PutSends data to the HTTP server using the HTTP PUT method.
ResetResets the component.

Event List


The following is the full list of the events fired by the control with short descriptions. Click on the links for further details.

CharactersFired for plain text segments of the input stream.
ConnectedFired immediately after a connection completes (or fails).
ConnectionStatusFired to indicate changes in connection state.
DisconnectedFired when a connection is closed.
EndElementFired when an end-element tag is encountered.
ErrorInformation about errors during data delivery.
HeaderFired every time a header line comes in.
IgnorableWhitespaceFired when a section of ignorable whitespace is encountered.
RedirectFired when a redirection is received from the server.
SetCookieFired for every cookie set by the server.
StartElementFired when a new element is encountered in the document.
StatusFired when the HTTP status line is received from the server.

Configuration Settings


The following is a list of configuration settings for the control with short descriptions. Click on the links for further details.

CacheContentIf true, the original JSON is stored internally in a buffer.
RequireJSONContentTypeControls whether the component checks for a JSON Content-Type value in the response.
AcceptEncodingUsed to tell the server which types of content encodings the client supports.
AllowHTTPCompressionThis property enables HTTP compression for receiving data.
AllowIdenticalRedirectURLAllow redirects to the same URL.
AppendWhether to append data to LocalFile.
AuthorizationThe Authorization string to be sent to the server.
BytesTransferredContains the number of bytes transferred in the response data.
EncodeURLIf set to true the URL will be encoded by the component.
FollowRedirectsDetermines what happens when the server issues a redirect.
GetOn302RedirectIf set to true the component will perform a GET on the new location.
HTTPVersionThe version of HTTP used by the component.
IfModifiedSinceA date determining the maximum age of the desired document.
KeepAliveDetermines whether the HTTP connection is closed after completion of the request.
MaxRedirectAttemptsLimits the number of redirects that are followed in a request.
OtherHeadersOther headers as determined by the user (optional).
ProxyAuthorizationThe authorization string to be sent to the proxy server.
ProxyAuthSchemeThe authorization scheme to be used for the proxy.
ProxyPasswordA password if authentication is to be used for the proxy.
ProxyPortPort for the proxy server (default 80).
ProxyServerName or IP address of a proxy server (optional).
ProxyUserA user name if authentication is to be used for the proxy.
TransferredDataLimitThe maximum number of incoming bytes to be stored by the component.
TransferredHeadersThe full set of headers as received from the server.
UseChunkedEncodingEnables or Disables HTTP chunked encoding for transfers.
ChunkSizeSpecifies the chunk size in bytes when using chunked encoding.
UserAgentInformation about the user agent (browser).
KerberosSPNThe Service Principal Name for the Kerberos Domain Controller.
ConnectionTimeoutSets a separate timeout value for establishing a connection.
FirewallAutoDetectTells the component whether or not to automatically detect and use firewall system settings, if available.
FirewallHostName or IP address of firewall (optional).
FirewallPasswordPassword to be used if authentication is to be used when connecting through the firewall.
FirewallPortThe TCP port for the FirewallHost;.
FirewallTypeDetermines the type of firewall to connect through.
FirewallUserA user name if authentication is to be used connecting through a firewall.
KeepAliveTimeThe inactivity time in milliseconds before a TCP keep-alive packet is sent.
KeepAliveIntervalThe retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received.
LingerWhen set to True, connections are terminated gracefully.
LingerTimeTime in seconds to have the connection linger.
LocalHostThe name of the local host through which connections are initiated or accepted.
LocalPortThe TCP port in the local host where the component binds.
MaxLineLengthThe maximum amount of data to accumulate when no EOL is found.
MaxTransferRateThe transfer rate limit in bytes per second.
RecordLengthThe length of received data records.
TCPKeepAliveDetermines whether or not the keep alive socket option is enabled.
UseIPv6Whether to use IPv6.
TcpNoDelayWhether or not to delay when sending packets.
AbsoluteTimeoutDetermines whether timeouts are inactivity timeouts or absolute timeouts.
FirewallDataUsed to send extra data to the firewall.
InBufferSizeThe size in bytes of the incoming queue of the socket.
OutBufferSizeThe size in bytes of the outgoing queue of the socket.
CodePageThe system code page used for Unicode to Multibyte translations.

 
 
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