Function SetCollationTable() Foundation
Query current and/or set user defined collation table for current thread
Syntax
SetCollationTable( [<nCollation>], ;
[<aCollationTable>] ) --> aOldCollationTable
Scope
thread-local
Parameters
<nCollation>
<nCollation> is the numeric identifier for the collation table to be selected. #define constants from the file COLLAT.CH must be used for this parameter.
<aCollationTable>
<aCollationTable> is a one dimensional array with 256 elements. It must contain numeric values representing the weighing factors for single characters. The ASCII value of a character plus 1 defines the array element that contains the weighing factor for that character.
Return
If SetCollationTable() is called without the argument <aCollationTable>, the function returns a one dimensional array holding the weighing factors of characters for the current thread's active collation. If <nCollation> is passed, a weighing table for the specified collation is returned.
Description
The function SetCollationTable() retrieves a collation table that defines sorting and comparison rules for characters. When using COLLAT_USER for <nCollation>, the functions allows the configuration of a user defined collation table.
The collation table setting is thread local. When a new thread is created, it inherits the collation table setting of the thread in which it is created.
Note that only the COLLAT_USER collation table can be configured. All other collation tables are read-only.
Examples
// The example demonstrates how to activate
// a user-defined collation table
#include "Collat.ch"
PROCEDURE Main
LOCAL aCollation, n
aCollation := SetCollationTable( COLLAT_AMERICAN )
? "A" = "Z" // Result: .F.
n := aCollation[ Asc("Z") + 1 ]
aCollation[ Asc("A") + 1 ] := n
SetCollationTable( COLLAT_USER, aCollation )
SetCollation( COLLAT_USER )
? "A" = "Z" // Result: .T.
SetCollation( COLLAT_AMERICAN )
? "A" = "Z" // Result: .F.
RETURN
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