[DUG] Validating CDS files

[Matthew Comb]

The driver for the question, is that we have some application client
datasets which are put into a defaulted state if a corrupt cds file is
loaded.

Yes with XML, we can just validate the XML, but we use the binary format
so that solution does not apply.

At present we basically have two solutions.

1. Load into a test clientdataset as suggested by Alistair. This is a
valid solution but does add considerable load time into the startup.

2. Can load into application clientdatasets, and dispose and reload if
error encountered. This is ok also but does require additional loading in
case of error.

What I'm really after is a file level test to check that file should even
be attempted. e.g. open file stream seek start and seek end and check a
couple of bytes... that type of thing.

Matt.



> What does "validate" mean for a CDS file ?
>
> For XML it obviously/intuitively means "is a valid XML representation of a
> CDS file" but for a CDS file, if you dumped it from a client data set in
> the
> first place, what additional validation would be needed to ensure that it
> is
> a CDS file ?
>
>
> -----Original Message-----
> From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
> On
> Behalf Of Matthew Comb
> Sent: Monday, 17 January 2011 10:27
> To: NZ Borland Developers Group - Delphi List
> Subject: Re: [DUG] Validating CDS files
>
> Hey Cam, for space size reasons, we're using the CDS format not the XML
> format as the files get pretty large.
>
> Matt
>
>> If you have dumped the CDS as XML then you can validate it using XSD.  I
>> haven't come across a schema for it but it shouldn't be hard to make.
>>
>> Cameron Hart | Development Manager | Flow Software Limited
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>> -----Original Message-----
>> From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
>> On Behalf Of Matthew Comb
>> Sent: Monday, 17 January 2011 10:03 a.m.
>> To: NZ Borland Developers Group - Delphi List
>> Cc: NZ Borland Developers Group - Delphi List
>> Subject: [DUG] Validating CDS files
>>
>> Does anyone know if there is a way to Validate a CDS file (midas) before
>> attempting to load it into the dataset ?
>>
>> Matt
>>
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