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GoFiler Legato Script Reference
Legato v 1.4j Application v 5.22b
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Chapter Three — Data Types and Operators (continued)
Overview
The IsValidHandle function checks a handle value to see if it is open and valid.
Syntax/Parameters
Syntax
boolean = IsValidHandle ( handle handle );
Parameters
handle
A handle value as retrieved from functions such as the OpenFile or LogCreate functions.
Return Value
Returns a boolean value as TRUE if the function handle is valid or FALSE if it is not.
Remarks
This function scans the internal object table for the handle value. If the handle exists, the function will return TRUE.
Non-Legato handles are not tested and will return FALSE (unless, by chance, the value matches a valid handle, for example, a window handle happens to match). While a match is unlikely, programmers are cautioned not to mix Windows and other handles with Legato handles.
The handle value NULL_HANDLE and INVALID_HANDLE_VALUE are always invalid.
Related Functions
Platform Support
Go13, Go16, GoFiler Complete, GoFiler Corporate, GoFiler, GoFiler Lite, GoXBRL
Legato IDE, Legato Basic
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