b = oDataTable.ReadFromWeb("http://ComputerName/ComponentId/data.xml?fmt=purevalue", sParam)
|URL||(String) The URL address of the data Web server where the XML data are stored. The PROMOTIC application as the Web server offers the data by default on the path (see the page PmDataTable > Web Server): |
Caution! Head of the address ("http:") must be entered! If you want to enter the address of the local computer, it is possible to enter the localhost word as the ComputerName. The Port needn't be entered if the Web server is on the standard port 80.
|sParam||(String) Additional parameters of the transfer. It is the text in the form, for example "user:NAME1;psw:PASSWORD1;". If no parameter is needed, an empty text "" can be entered.|
user - Name of the user for the authentication. See the WebRead permission on the server side. If this parameter is missing and the site requires the authentication, then the onEndOfTransfer event fires with the error pEvent.Error=40.
psw - Password of the user for the authentication. This parameter is ignored if the user parameter is missing.
By calling the ReadFromWeb method over the object, this object is regarded as the Web client that reads data from the component of the Web server, in this case from another but the same configured PmDataTable object in another application on the same or another computer.
The method only activates the data transfer but there is no assurance that the data are already transferred after the completion of this method. The data transfer termination is announced by the onEndOfTransfer event. During the data transfer (i.e. in the time after calling the ReadFromWeb method and before the onEndOfTransfer event fires) neither the ReadFromWeb method nor the WriteToWeb method can be called over the object again - then the method returns the false value. Using the WebClientIsReady property it can be found out if the object is ready for the next transfer.
oData.ReadFromWeb "http://localhost/param/data.xml?fmt=purevalue", "user:oper;psw:ABCD;"