bytebug@dhw68k.cts.com (Roger L. Long) (05/29/88)
[188: ChangedResource: Too much of a good thing]
The toolbox trap ChangedResource is used to inform the Resource
Manager that the contents of a resource have changed and should
be written to disk. The actual write occurs on the next call to
WriteResource (for the specific resource) or UpdateResFile (for
the resource file containing the specified resource). When
called, ChangedResource reserves enough disk space to contain the
changed resource. A little-known "feature" of ChangedResource is
that it reserves disk space every time it is called. Thus if you
call ChangedResource ten times on a large resource before the
resource is actually written out, you may unexpectedly run out of
disk space since ten times the amount of disk space actually
needed will be reserved.
If your program frequently changes the contents of resources,
especially large ones, then you should call WriteResource or
UpdateResFile immediately after calling ChangedResource. Once
the resource is actually written, the fileUs EOF will be set
correctly, and the first subsequent call to ChangedResource will
work correctly.
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