Operator Reference
dev_error_var (Operator)
dev_error_var — Define or undefine an error variable.
Signature
Description
dev_error_var defines an error variable, i.e., a variable which
contains the result state of the last operator call.
ErrorVar will be 2 (
H_MSG_TRUE)
if no error had occurred.
The parameter Mode specifies whether the error variable should be
used (1) or not (0).
If an error variable is active it will be updated each time an operator
execution is finished. Thus a value is only valid until the next
call of an operator. The value can be saved by assigning it to
another variable (see example)
or by calling dev_error_var(ErrorVar,0).
Parameters
ErrorVar (input_control) integer → (integer)
Name of the variable which shall contain the error status.
Default: 'ErrorVar'
Mode (input_control) integer → (integer)
Switch the error variable on or off.
Default: 1
List of values: 0, 1
Example (HDevelop)
dev_close_window ()
dev_open_window (0, 0, 512, 512, 'black', WindowHandle)
dev_error_var (Error, 1)
dev_set_check ('~give_error')
FileName := 'wrong_name'
read_image (Image, FileName)
ReadError := Error
if (ReadError != H_MSG_TRUE)
write_string (WindowHandle, 'wrong file name: '+FileName)
endif
Result
If the values of the specified parameters are correct,
dev_error_var returns 2 (
H_MSG_TRUE)
. Otherwise, an
exception is raised and an error code returned.
Possible Predecessors
Possible Successors
dev_set_check,
if,
elseif,
else,
assign
See also
Module
Foundation