[fpc-pascal]File errors

[Peter Vreman]

>> On Mon, May 05, 2003 at 01:36:41PM +0200, Marco van de Voort wrote:
>> > [ Charset ISO-8859-1 unsupported, converting... ]
>> > > > Hi,
>> > > >
>> > > > How do you check for file errors such as "Disk Full" before
>> attempting
>> > > > to write out a file to disk ?
>> > > > You can easily check if a file exists with the fileExists
>> function...
>> > > > Can something similar be done for other file errors ?
>> > >
>> > > You can check with diskfree() how much space is left on a disk
>> >
>> > Can be dangerous in multi tasking and/or multi user system. Also that
>> > doesn't keep track of e.g. the reserved rootspace on unix.
>> >
>> > Best way is to check ioresult after writing each block to see if it is
>> zero?
>>
>> Or use a try except ?
>
> Standard fileoperations don't raise exceptions. That is for higher level
> constructs (like FCL file streams).
>
> If basic block I/O would use exceptions, that would make it slow.

basic IO also generates exceptions when SysUtils is used. The normal
runtime errors will then be mapped to their corresponding exceptions.