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version 11.3
SVG_Read_last_error 
Error
| Parameter | Type | Description | ||||
| This command does not require any parameters | ||||||
| Function result | Error |  | Number of last error | |||
Description
The SVG_Read_last_error command returns the number of the last error that occurred during the execution of a 4D SVG component command and resets this error.
The error number returned can be specific to a component command or may be an error generated by 4D. The following errors are generated by the component:
| 8850 | Insufficient number of parameters | |
| 8851 | Invalid parameter type | |
| 8852 | Invalid reference | |
| 8853 | Incorrect value for attribute | |
| 8854 | The element does not accept this command | |
| 8855 | Invalid ( ID not found in document) object name (symbol, marker, filter, etc.) | |
| 8856 | DTD file not found | |
| 8857 | Incorrect value for a parameter | |
| 8858 | Unknown error |
Examples
1. Given the "SVG_error_mgmt" method of the example for the SVG_Set_error_handler command:
`Installation of error-handling method
$ Error_Method_Txt:=SVG_Set_error_handler ("SVG_error_mgmt")
`from now on it is the SVG_error_mgmt method that will be executed in the case of an error
`Creation of new SVG document
$SVG:=SVG_New (1200; 900; "SVG Component Test"; ""; True)
SVG_SET_VIEWBOX ($SVG; 0; 0; 1500; 1000)
If (SVG_Read_last_error =0)
…
Else
`The SVG_error_mgmt method has been called and has received the error number
End if
`Uninstalling of error-handling method
SVG_Set_error_handler
2. Given the following SVG_error_mgmt method:
C_LONGINT ($1)
C_TEXT ($2)
`Keep the error and the context
errorNumber:=$1
commandName:=$2
`Set the OK system variable to 0
OK := 0
` Installation of error-handling method
$ Error_Method_Txt:=SVG_Set_error_handler ("SVG_error_mgmt")
` Creation of new SVG document
$SVG:=SVG_New (1200; 900; " SVG Component Test "; ""; True)
SVG_SET_VIEWBOX ($SVG; 0; 0; 1500; 1000)
If (OK = 1)
…
Else
ALERT("Error No." + String(errorNumber) + " during execution of the command \"" + commandName + "\"")
End if
` Uninstalling of error-handling method
SVG_Set_error_handler
See Also
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