"

 COPYRIGHT (c) 1998 by eXept Software AG

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

"{ Package: 'stx:libbasic2' }"

ExternalBytes subclass:#ExternalLong

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'System-Support'

!

!ExternalLong class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1998 by eXept Software AG

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    mostly added for odbc, which uses instances of me as container in which values

    (pointers) are returned. The name is misleading: it should be ExternalPointer,

    because on machines where sizeof(long) !!= sizeof(void *), that makes a difference.

    However, over time, others started to use this class, and renaming it would break some code.

"

! !

!ExternalLong class methodsFor:'instance creation'!

new

    "allocate some memory usable for data;

     the memory is not controlled by the garbage collector.

     Return a corresponding ExternalBytes object or raise MallocFailure (if malloc fails).

     Use this, if you have to pass a block of bytes to some

     external destination (such as a C function) which does not copy the

     data, but instead keeps a reference to it. For example, many functions

     which expect strings simply keep a ref to the passed string - for those,

     an ST/X string-pointer is not the right thing to pass, since ST/X objects

     may change their address.

     DANGER ALERT: the memory is NOT automatically freed until it is either

    ^ super new:(ExternalAddress pointerSize)

    "

     ExternalLong new

    "

    "Modified: / 20-12-2010 / 16:22:51 / cg"

!

unprotectedNew

    "allocate some memory usable for data;

     the memory is under the control of the garbage collector.

     Return a corresponding ExternalBytes object or raise MallocFailure (if malloc fails).

     DANGER ALERT: the memory block as allocated will be automatically freed

    ^ super unprotectedNew:(ExternalAddress pointerSize)

    "

     ExternalLong new

    "

    "Modified: / 20-12-2010 / 16:22:39 / cg"

! !

!ExternalLong methodsFor:'accessing'!

asBoolean

    |result|

    result := self byteAt:1.

    result = 0 ifTrue:[

    ].

    ^ true.

!

asExternalBytes

    ^ ExternalBytes address:(self value)

    "

    "

!

asInteger

    "

     ExternalLong new value:10

     (ExternalLong new value:16rFFFFFF) asInteger

    "

    "Modified: / 22-12-2010 / 18:34:02 / cg"

!

asNullStatus

    |result|

    result := self wordAt:1 MSB:false.

    result = 0 ifTrue:[ ^ #SQL_NO_NULLS ].

    result = 1 ifTrue:[ ^ #SQL_NULLABLE ].

    ^ #SQL_NULLABLE_UNKNOWN

!

asPointer

     (use this if you passed me to a C function as out parameter, to fetch the returned value)"

    "/ ^ ExternalAddress new setAddress:(self value address)

    ^ self pointerAt:1.

    "

     (ExternalLong new value:10) asPointer

    "

!

asUnsignedInteger

    "warning: only returns a 32bit integer"

    "

    "

    "Created: / 22-12-2010 / 18:31:03 / cg"

!

boolean:bool

    bool ifTrue:[self byteAt:1 put:1].

    self byteAt:1 put:0.

!

value

    ^ (self pointerAt:1) address

    "

     (ExternalLong new value:10) value

    "

    "Modified: / 30.3.1998 / 17:07:57 / cg"

!

value:anInteger

    "/ self doubleWordAt:1 put:anInteger

! !

!ExternalLong methodsFor:'printing & storing'!

printOn:aStream

    aStream nextPutAll:self className; nextPut:$(.

    self asInteger printOn:aStream.

    aStream nextPut:$)

! !

!ExternalLong class methodsFor:'documentation'!

version

!

version_CVS

! !