The call control statement calls a subroutine which must be defined by a previous sub statement.
Syntax:
Call name ( [ paramlist ])
Arguments:
| Argument | Description |
|---|---|
| name | The name of the subroutine. |
| paramlist | A comma separated list of the actual parameters to be sent to the subroutine. Each item in the list may be a field name, a variable or an arbitrary expression. |
The subroutine called by a call statement must be defined by a sub encountered earlier during script execution.
Parameters are copied into the subroutine and, if the parameter in the call statement is a variable and not an expression, copied back out again upon exiting the subroutine.
Limitations:
Since the call statement is a control statement and as such is ended with either a semicolon or end-of-line, it must not cross a line boundary.
Example 1:
// Example 1
Sub INCR (I,J)
I = I + 1
Exit Sub when I < 10
J = J + 1
End Sub
Call INCR (X,Y)
Example 2:
// Example 2 - List all QV related files on disk
sub DoDir (Root)
For Each Ext in 'qvw', 'qvo', 'qvs', 'qvt', 'qvd', 'qvc'
For Each File in filelist (Root&'\*.' &Ext)
LOAD
'$(File)' as Name, FileSize( '$(File)' ) as
Size, FileTime( '$(File)' ) as FileTime
autogenerate 1;
Next File
Next Ext
For Each Dir in dirlist (Root&'\*' )
Call DoDir (Dir)
Next Dir
End Sub
Call DoDir ('C:')
