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strange record behavior in MCL2.0B1P2 (system 7)
- To: email@example.com
- Subject: strange record behavior in MCL2.0B1P2 (system 7)
- From: Andrew L. M. Shalit <alms>
- Date: Tue, 11 Jun 91 17:11:38 -0400
- Cc: info-mcl
- In-reply-to: Guillaume Cartier's message of Tue, 11 Jun 91 11:15:17 -0400 <9106111515.AA22727@mipsmath>
Date: Tue, 11 Jun 91 11:15:17 -0400
From: firstname.lastname@example.org (Guillaume Cartier)
Is the following behavior a bug or am I missing something?
? (setq b (make-bitmap 0 0 10 10))
#<A Mac Zone Pointer Size 34 #x18D240>
? (rref b :bitmap.bounds)
> Error: Illegal attempt to get a pointer to a :RECT within a handle
> While executing: CCL::EXPAND-HANDLE-RECORD-GET
To get to the bounds part of the record I have to specify
the storage type.
? (rref b :bitmap.bounds :storage :pointer)
#<A Mac Non-zone Pointer #x18D246>
This is even stanger behavior...
? (rref b :bitmap.baseaddr)
#<A Mac Non-zone Pointer #x18D24E>
? (rref b :bitmap.baseaddr :storage :pointer)
#<A Mac Non-zone Pointer #x2C0019>
To top it all, it often happens that (make-bitmap)
makes my macintosh crash (even if I just started
a plain MCL!).
Any hints, patches, ... would be *greatly* appreciated.
You cannot simply pretend that something is a pointer and not a handle.
You have to actually make it a pointer. You get a pointer from a handle
by dereferencing it.
If a bitmap is a handle, then you cannot say:
(rref b :bitmap.bounds :storage :pointer)
You must say
(with-dereferenced-handles ((b-pointer b))
(rref b :bitmap.bounds :storage :pointer))
Of course, if you do this and the handle is then relocated, you will