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IDLnetOGCWCS Properties

IDLnetOGCWCS Properties

IDLnetOGCWCS objects have the following properties. Properties with the word “Yes” in the “Init” column of the property table can be set via IDLnetOGCWCS::Init.

Note: For a discussion of the property description tables shown below, see Modifying Object Property Descriptions.

Objects of this class have the following properties.

AUTHENTICATION

CALLBACK_DATA

CALLBACK_FUNCTION

CAPABILITIES_FILENAME

CONNECT_TIMEOUT

CONTENT_TYPE

COVERAGE_FILENAME

DESCRIBE_COVERAGE_FILENAME

ENCODE

HEADERS

LAST_FILE

PASSWORD

PROXY_AUTHENTICATION

PROXY_HOSTNAME

PROXY_PASSWORD

PROXY_PORT

PROXY_USERNAME

RESPONSE_HEADER

SSL_CERTIFICATE_FILE

SSL_VERIFY_HOST

SSL_VERIFY_PEER

TIMEOUT

URL_HOSTNAME

URL_PATH

URL_PORT

URL_QUERY_PREFIX

URL_QUERY_SUFFIX

URL_SCHEME

USERNAME

VERBOSE

WCS_VERSION

AUTHENTICATION

This property specifies the type of authentication used when connecting to an OGC server. Supported authentication modes are:

  • 0: Disabled. Authentication is disabled.
  • 1: Basic only. Username and password are sent as plain text.
  • 2: Digest only. Username and password are encrypted before being sent.
  • 3: Basic and digest. Either basic or digest is used depending on the mode preferred by the remote server. This is the default.

When AUTHENTICATION is set, one or both of the USERNAME and PASSWORD properties must also be set. If neither of these properties is set, this property is ignored.

Property Type

Integer

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

CALLBACK_DATA

This property contains data that is to be passed to the function defined by the CALLBACK_FUNCTION property when a callback is initiated. The data contained in the variable is defined and set by the caller. When a callback is initiated, this data is passed, unmodified, directly to callback function. Data can be of any type supported by IDL variables including numerical, string, pointer and structure data. If this property is not set, the GetCapabilities, DescribeCoverage, and GetCoverage methods will pass the integer value zero to the callback function.

Type

Any IDL variable

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

CALLBACK_FUNCTION

This property is the name of the .pro code function to be called when GetCapabilities, DescribeCoverage, and GetCoverage, methods are retrieving information from the remote server. The function provides status information in addition to providing a way to cancel an operation. If this property is not set, then no callbacks will be made by the previously noted methods. See Using Callbacks with the IDLnetOGCWCS Object  for more information.

The default value is an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

CAPABILITIES_FILENAME

The IDLnetOGCWCS::GetCapabilities method returns and stores an XML file that contains the coverage offering briefs available on the remote server. Set this property to define the path and filename of this file, minus the extension. The file type extension is automatically set based on the type of file downloaded (typically .xml). If this property stays the same between calls to GetCapabilities, the last file received is overwritten.

This property defaults to a file named cap, located in your application user directory. If a file was returned by the most recent call to the GetCapabilities method, the LAST_FILE property will contain the full path and filename of the downloaded file.

Note: Do not include a file type extension in the filename. If the retrieved file does not have the same extension as that given, the name will be appended with the file type extension of the received file (but this property will remain unchanged). For example, if you include the .xml extension (cap.xml) and the file received is an HTML file, the filename of the file on disk will be cap.xml.html, while this property remains cap.xml. Always omit the file type extension to avoid such inconsistencies.

This property cannot be set to an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

CONNECT_TIMEOUT

This property controls how long to wait for a successful connection to an OGC server before ending the attempt to establish a connection. The default is 180 seconds.

Type

Integer

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

CONTENT_TYPE

Set this read-only property to a variable that will indicate the document type of the last file received as a result of an HTTP GET request. The property is extracted from the contents of the Content-Type field found in an HTTP response header.

Type

String

Name String

not displayed

Get: Yes

Set: No

Init:No

Registered: No

COVERAGE_FILENAME

The IDLnetOGCWCS::GetCoverage method returns and stores a data file from the WCS server. Set this property to define the path and filename of this file, minus the extension. The file type extension is automatically set based on the type of file downloaded. If this property stays the same (the path and filename are unchanged, and the same type of file is retrieved) between calls to GetCoverage, the last file received is overwritten.

This property defaults to a file named cov, located in your application user directory. If a file was returned by the most recent call to the GetCoverage method, the LAST_FILE property will contain the full path and filename of the downloaded file.

Note: Do not include a file type extension in the filename. If the retrieved file does not have the same extension as that given, the name will be appended with the file type extension of the received file (but this property will remain unchanged). For example, if you include the .tiff extension (cov.tiff) and the file received is an .gml file, the filename of the file on disk will be cov.tiff.gml, while this property remains cov.tiff. Always omit the file type extension to avoid such inconsistencies.

This property cannot be set to an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

DESCRIBE_COVERAGE_FILENAME

The IDLnetOGCWCS::DescribeCoverage method returns and stores an XML file that contains the coverage offerings available on the remote server. Set this property to define the path and filename of this file, minus the extension. The file type extension is automatically set based on the type of file downloaded (typically .xml). If this property stays the same between calls to DescribeCoverage, the last file received is overwritten.

This property defaults to a file named descov, located in your application user directory. If a file was returned by the most recent call to the DescribeCoverage method, the LAST_FILE property will contain the full path and filename of the downloaded file.

Note: Do not include a file type extension in the filename. If the retrieved file does not have the same extension as that given, the name will be appended with the file type extension of the received file (but this property will remain unchanged). For example, if you include the .xml extension (descov.xml) and the file received is an HTML file, the filename of the file on disk will be descov.xml.html, while this property remains descov.xml. Always omit the file type extension to avoid such inconsistencies.

This property cannot be set to an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

ENCODE

This property determines if a compressed or encoded response will be requested from a remote OGC WCS server (during GetCapabilities, DescribeCoverage, and GetCoverage method calls). By default, the IDLnetOGCWCS object requests an unencoded response (ENCODE=0) in order to reduce the number of bytes that need to be sent over the network.

Note: The server does not have to respond with compressed or encoded data. You can determine the encoding, if any, by examining the “Content-Encoding” header in the response. See the VERBOSE property for information on how to access such information.

Allowable values are:

Value

Description

0

No encoding—do not request an encoded response. If the server sends a compressed or encoded response even though this was not requested, the response will not be decompressed or decoded and the output file will be written with the compressed or encoded data.

This is the default

1

DEFLATE encoding — request and accept DEFLATE encoding. If the server replies with an encoded response, the data is decompressed or decoded before being written to the output file.

2

GZIP encoding — request and accept GZIP encoding. If the server replies with an encoded response, the data is decompressed or decoded before being written to the output file.

3

DEFLATE and GZIP encoding — request and accept both types of encoded responses. If the server replies with an encoded response, the data is decompressed or decoded before being written to the output file.

Type

Integer

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

HEADERS

Note: This property is set automatically and need not be modified unless you have specific HTTP header information that you want included in a GET request sent to a remote WCS server.

Note: This property is automatically set to the default value (clearing any custom header information) after a call to any IDLnetOGCWCS::Get* method except GetProperty. Clearing the HEADERS property prevents the inadvertent use of custom header values in future calls to Get methods.

Set this property to a string or array of strings containing one or more valid header fields and values separated by a colon. Each string in the string array should contain a single header field.

The HTTP header Host, Accept, and Encode fields are set by default. To add, disable or modify headers, do one of the following:

  • Add a custom header by setting this property equal to a string containing a valid header field and value or a string array containing multiple strings. This property can be called multiple times to append additional header fields to the list of existing custom header items.
  • Disable an existing header by setting the HTTP header field name equal to no value (no data on the right side of the colon). For example, HEADERS="Accept:" disables the header field.
  • Add a header without contents by setting a header field equal to an empty string. For example, HEADERS="Accept:''" clears the field contents.

Set this property to an empty string to clear all custom headers and reset default values if appropriate. For example, HEADERS='' clears all custom changes.

Note: This method cannot be used to modify the first method line of a HTTP request (typically GET or POST).

Retrieving this property will return only those headers set using the Init or SetProperty methods. Use the VERBOSE keyword to see the default header information included in a request.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

LAST_FILE

This property contains the full path and filename of the file retrieved from the last successful call to one of the GetCapabilities, GetCoverage, or DescribeCoverage methods. If the most recent call did not return a file, this property will contain an empty string. The default value is an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: No

Init:No

Registered: No

PASSWORD

This property contains the password required for successful authentication with a secure WCS server. The default value is an empty string.

Property Type

String

Name String

not displayed

Get: No

Set: Yes

Init:Yes

Registered: No

PROXY_AUTHENTICATION

This property specifies the type of authentication that will be used when connecting to a proxy server. Supported authentication modes are:

  • 0: Disabled, authentication is disabled.
  • 1: Basic only, username and password are sent as plain text.
  • 2: Digest only, username and password are encrypted before being sent.
  • 3: Basic and digest, either basic or digest is used depending on the mode preferred by the server. This is the default.

When PROXY_AUTHENTICATION is set and you are using a proxy server, the PROXY_USERNAME and PROXY_PASSWORD properties must also be set. If either of these properties are not set, then this property is ignored.

Type

Integer

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

PROXY_HOSTNAME

This property specifies the hostname or IP address of the proxy server. This property must be set when connecting to an intranet or the internet through a proxy server. The default value is an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

PROXY_PASSWORD

This property contains the password required for successful authentication with a secure proxy server. The default value is an empty string.

Type

String

Name String

not displayed

Get: No

Set: Yes

Init:Yes

Registered: No

PROXY_PORT

This property specifies the TCP/IP port that the proxy server listens to for incoming requests. The default value is “80”, the standard port for an HTTP request. This property must be set when connecting to an intranet or the internet through a proxy server.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

PROXY_USERNAME

This property contains the username required for successful authentication with a secure proxy server. The default value is an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

RESPONSE_HEADER

This read-only property contains the HTTP response header from the last request made to an OGC WCS server. The default value is an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: No

Init:No

Registered: No

SSL_CERTIFICATE_FILE

Set this property to the full path and filename of the file containing one or more certificates to be verified with the peer when communicating with a secure server. The default location is IDL_DIR/bin/bin.platform directory where IDL_DIR is your IDL installation directory. A default bundle of Certificate Authority (CA) certificates is installed in this location. Use this property to specify the location of an alternate certificate file.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

SSL_VERIFY_HOST

When negotiating a SSL connection, the server sends a certificate indicating its identity. Use this property to determine whether you have connected to the expected server as follows:

  • 0: No verification. The connection succeeds regardless of the name fields in the certificate.
  • 1: Verify server. When this property is non-zero, the Common Name field or a Subject Alternate Name field in the certificate must match the host name in the URL (the URL_HOSTNAME property), or the connection fails. The default.

Note: To guard against a dishonest server, authenticate its certificate. See SSL_VERIFY_PEER .

Property Type

Boolean

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

SSL_VERIFY_PEER

SSL peer authentication depends on verification of a chain of digital signatures contained in one or more Certificate Authority (CA) certificates. See SSL_CERTIFICATE_FILE for information on the default CA certificates installed with IDL and how to supply your own certificates.

Type

Boolean

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

TIMEOUT

This property controls how long to wait for the transmission from the OGC server to complete before ending the attempt. The default is 1800 seconds.

Type

Integer

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

URL_HOSTNAME

This property specifies the host name or IP address of the remote OGC WCS server.

Note: This property and the URL_PATH property must be set before calling GetCapabilities, DescribeCoverage, or GetCoverage. The hostname and path elements are integral components of the request that is sent to the WCS server.

You can either set this property manually or pass a URL to the IDLnetOGCWCS::ParseUrl method. See Translating a URL into Property Values  for more information. The default value is an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

URL_PATH

This property specifies the path to the remote OGC WCS server.

Note: This property and the URL_HOSTNAME property must be set before calling GetCapabilities, DescribeCoverage, or GetCoverage. The path and hostname elements are integral components of the request that is sent to the WCS server.

You can either set this property manually or pass a URL to the IDLnetOGCWCS::ParseUrl method. See Translating a URL into Property Values  for more information. The default value is an empty string.  

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

URL_PORT

This property specifies the TCP/IP port at which the remote server listens for incoming requests. You can either set this property manually or pass a URL to the IDLnetOGCWCS::ParseUrl method. See Translating a URL into Property Values for more information. The default value is “80”, the standard port for an HTTP request.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

URL_QUERY_PREFIX

This property specifies a prefix containing additional query information that will be prepended to the main portion of a request. You can either set this property manually or pass a URL to the IDLnetOGCWCS::ParseUrl method. See Translating a URL into Property Values  for more information. The default value is an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

URL_QUERY_SUFFIX

This property specifies a suffix containing additional query information that will be appended to the main portion of a request. See Translating a URL into Property Values for more information on this property. The default value is an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

URL_SCHEME

This property specifies the name of the protocol used to communicate with the remote WCS server when a request is made. You can either set this property manually or pass a URL to the IDLnetOGCWCS::ParseUrl method. See Translating a URL into Property Values  for more information. Possible values are:

String Value

Description

http

This is the default.

https

Use this setting when making a secure request and Secure Socket Layer (SSL) is supported by the remote WCS server. See SSL_CERTIFICATE_FILE, SSL_VERIFY_HOST, and SSL_VERIFY_PEER for SSL-related configuration parameters.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

USERNAME

This property contains the username required for successful authentication with a secure WCS server. The default value is an empty string.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

VERBOSE

Set this property to return connection and HTTP header information associated with a IDLnetOGCWCS::GetCapabilities, IDLnetOGCWCS::DescribeCoverage, or IDLnetOGCWCS::GetCoverage method request.

Type

Boolean

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No

Note: For a simple example of using a callback to return VERBOSE status information, see IDLnetOGCWCS::GetCapabilities.

WCS_VERSION

This property defines the version of the OGC WCS standard supported by the IDLnetOGCWCS object. The only valid value is “Version=1.0.0” for all requests.

Type

String

Name String

not displayed

Get: Yes

Set: Yes

Init:Yes

Registered: No



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