CheckExtension

Résumé

Checks to see if a license is available to be checked out for a specific type of extension.

Once the extension license has been retrieved by the script, tools using that extension can be used. Once a script is finished with an extension's tools, the CheckInExtension function should be used to return the license to the License Manager so other applications can use it. All checked-out extension licenses and set product licenses are returned to the License Manager when a script completes.

Learn more about licensing and extensions

Syntaxe

CheckExtension (extension_code)

Paramètre	Explication	Type de données
extension_code	Keyword for the extension product that is being checked. 3D —Extension ArcGIS 3D Analyst Aeronautical —ArcGIS for Aviation: Charting Airports —ArcGIS for Aviation: Airports ArcScan —ArcScan Bathymetry —ArcGIS for Maritime: Bathymetry Business —ArcGIS Business Analyst DataReviewer —ArcGIS Data Reviewer for Desktop DataInteroperability —Extension ArcGIS Data Interoperability for Desktop Defense —Esri Defense Solution Foundation —Esri Production Mapping GeoStats —Extension ArcGIS Geostatistical Analyst Highways —Esri Roads and Highways JTX —ArcGIS Workflow Manager for Desktop LocationReferencing —ArcGIS Pipeline Referencing Nautical —ArcGIS for Maritime: Charting Network —Extension ArcGIS Network Analyst Schematics —Extension ArcGIS Schematics SMPAsiaPacific —StreetMap Premium Asia Pacific SMPEurope —StreetMap Premium Europe SMPJapan —StreetMap Premium Japan SMPLatinAmerica —StreetMap Premium Latin America SMPMiddleEastAfrica —StreetMap Premium Middle East Africa SMPNorthAmerica —StreetMap Premium North America Spatial —Extension ArcGIS Spatial Analyst Tracking —Extension ArcGIS Tracking Analyst	String

Valeur renvoyée

Type de données	Explication
String	There are four possible returned values for CheckExtension: Available —The requested license is available to be set. Unavailable —The requested license is unavailable to be set. NotLicensed —The requested license is not valid. Failed —A system failure occurred during request.

Exemple de code

CheckExtension example

Check for availability of Extension ArcGIS 3D Analyst before checking it out.

import arcpy

class LicenseError(Exception):
    pass

try:
    if arcpy.CheckExtension("3D") == "Available":
        arcpy.CheckOutExtension("3D")
    else:
        # raise a custom exception
        raise LicenseError

    arcpy.env.workspace = "c:/GrosMorne"
    arcpy.HillShade_3d("WesternBrook", "wbrook_hill", 300)
    arcpy.Aspect_3d("WesternBrook", "wbrook_aspect")
    arcpy.CheckInExtension("3D")

except LicenseError:
    print("3D Analyst license is unavailable")
except arcpy.ExecuteError:
    print(arcpy.GetMessages(2))