F_CheckMemoryArea

The function returns information about the memory area in which the requested variable with the specified size is located. A return value of type E_TcMemoryArea is used for this purpose.

VAR_INPUT
    pData : PVOID;
    nSize : UDINT;
END_VAR

Example

PROGRAM MAIN
VAR
    nCounter : USINT;
    eMemAreaStatic : E_TcMemoryArea;
    pDynamicVariable : POINTER TO LREAL;
    eMemAreaDynamic : E_TcMemoryArea;
    pNull : PVOID := 0;
    eMemAreaUnknown : E_TcMemoryArea;
END_VAR
-------------------------------------------------------------------

nCounter := nCounter + 1;
eMemAreaStatic := F_CheckMemoryArea( pData:=ADR(nCounter), nSize:=SIZEOF(nCounter) );

IF nCounter = 100 THEN
    pDynamicVariable := __NEW(LREAL);
    IF pDynamicVariable <> 0 THEN
        pDynamicVariable^ := 7 * 4.5; 
        eMemAreaDynamic := F_CheckMemoryArea( pData:=pDynamicVariable, nSize:=SIZEOF(LREAL) );
        __DELETE(pDynamicVariable);
    END_IF
END_IF

eMemAreaUnknown := F_CheckMemoryArea( pData:=pNull, nSize:=1 );