PV GET LAST ERROR
version 6.8
PV GET LAST ERROR (area; errorCode; errorText)
| Parameter | Type | Description | |
| area | Longint |  | 4D View area |
| errorCode | Longint |  | Error number |
| errorText | Text | | Error description text |
Description
The PV GET LAST ERROR command gets information on the last error for the specified 4D View area. If the area reference is equal to 0, the information will correspond to the last error received from all 4D View areas.
After execution of the command, errorCode receives the error number and errorText contains the detailed description of the corresponding error. The numbers and names of errors generated by 4D View are provided in Appendix A, List of 4D View error codes.
PV GET LAST ERROR only returns an error if the last call of a 4D View command for area provoked an error: any call to a command that does not provoke an error re-sets the last error to zero. To intercept and handle errors that may arise, use the PV ON ERROR command instead.
However, when you do not use the PV ON ERROR command, 4D View displays an alert dialog box to user in case of an error. It will then be possible to get the necessary information, for example in the 4D Debugger, using the PV GET LAST ERROR command.
Example
After loading values of a selection of records in a 4D View area, check to see if the available memory was sufficient to complete the operation without bogging it down. If not, offer the user a suggestion on how to fix this.
C_LONGINT($ErrorCode) `Error number
C_TEXT($ErrorText) `Text description of error
PV FIELD TO CELLS (Area;1;1;1;0;Table(->[Clients]);Table(->[Clients]);Field(->[Clients]FirstName))
PV FIELD TO CELLS (Area;1;2;1;0;Table(->[Clients]);Table(->[Clients]);Field(->[Clients]Name))
PV GET LAST ERROR (Area;$ErrorCode;$ErrorText) `Was there an error?
If ($ErrorCode=18) `Insufficient memory
ALERT("Insufficient memory: decrease the selection to display or give "+"4D more memory.")
End if
See Also