Re: To cast or not to cast?

Thanks a lot for that! Before going to the UInt16 problem, I better try to
solve that IntPtr problem.

Managed to use Marshal.Copy. Not sure how I should 'guess' the length of the
Byte array to copy to. When I type FirstBIRSample.BiometricData (which is
the IntPtr) in the command window, it returns to me: 2372256 - is this the
size?
I 'assumed' the size would be 1040 (which is stored in
FirstBIRSample.Length).

Second Part: Seems like the FirstBIRSample.Signature (also a pointer) is 0,
how should I store this?

Thanks so much!

""Ilya Tumanov [MS]"" <ilyatum@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:tz30okGPFHA.920@xxxxxxxxxxxxxxxxxxxxxxxx
> While storing UInt16 as Int is OK, it will take more space. The problem
> you're having is caused by range check. You might consider using
> unchecked() to disable it.
>
> System.Runtime.InteropServices.Marshal class allows you to copy data from
> the pointer to the array. Look into Copy() methods of that class.
>
> Best regards,
>
> Ilya
>
> This posting is provided "AS IS" with no warranties, and confers no
rights.
> --------------------
> > From: "Jeremy" <jezonline@xxxxxxxxxxx>
> > References: <umEpDi8OFHA.3880@xxxxxxxxxxxxxxxxxxxx>
> <64$0lp9OFHA.1564@xxxxxxxxxxxxxxxxxxxxx>
> > Subject: Re: To cast or not to cast?
> > Date: Fri, 8 Apr 2005 10:44:39 +0100
> > Lines: 91
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> microsoft.public.dotnet.framework.compactframework:26572
> > X-Tomcat-NG: microsoft.public.dotnet.framework.compactframework
> >
> > Thanks so much for the replies Alex and Ilya!
> >
> > I changed the types in sql. It wasn't happy with Uint16 mapped to
smallint
> > (sql says value is either too small or too large), so I just went for an
> > int.
> >
> > Not sure how to retrieve the data data an IntPtr is pointing to though.
> How
> > can I get that data as a byte array?
> >
> > thanks so much again!
> >
> > ""Ilya Tumanov [MS]"" <ilyatum@xxxxxxxxxxxxxxxxxxxx> wrote in message
> > news:64$0lp9OFHA.1564@xxxxxxxxxxxxxxxxxxxxxxxx
> > >
> >
>
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
> > > frlrfsystemdatasqldbtypeclasstopic.asp
> > >
> > > UInt32: Int will do. Signed and Unsigned integers are actually the
same;
> > > just cast them to the right type.
> > > UInt16: SmallInt, see warning above
> > > Byte: TinyInt
> > > BioAPI_*: look up underlying type definition and use it. Enums are
Int32
> > by
> > > default.
> > > IntPtr: it's Int32, so store it as Int.
> > >
> > > Note, however, it's probably pointless to store pointers in the data
> base.
> > > Pointer itself is not important, most likely you need to store
whatever
> > > it's pointing to.
> > >
> > > Best regards,
> > >
> > > Ilya
> > >
> > > This posting is provided "AS IS" with no warranties, and confers no
> > rights.
> > >
> > > --------------------
> > > > From: "Jeremy" <jezonline@xxxxxxxxxxx>
> > > > Subject: To cast or not to cast?
> > > > Date: Fri, 8 Apr 2005 00:21:17 +0100
> > > > Lines: 25
> > > > X-Priority: 3
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> > > > X-Newsreader: Microsoft Outlook Express 6.00.2800.1478
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> > > > Message-ID: <umEpDi8OFHA.3880@xxxxxxxxxxxxxxxxxxxx>
> > > > Newsgroups: microsoft.public.dotnet.framework.compactframework
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> > > microsoft.public.dotnet.framework.compactframework:26546
> > > > X-Tomcat-NG: microsoft.public.dotnet.framework.compactframework
> > > >
> > > > Hi,
> > > >
> > > > I'm trying to convert the following types into types that I can
insert
> > in
> > > an
> > > > SQL database (via a webservice). None of these however are accepted
by
> > Sql
> > > > (i.e., there is no OleDbType for them). I could only use integer
type
> > for
> > > > UInt32, that's about it. I'm totally unsure about the other types.
> What
> > > I've
> > > > tried doing so far is casting them prior to sending them to the
> > > webservice.
> > > > When inserting them I get errors though. Would anyone know/could
point
> > me
> > > to
> > > > types that I could use? Any help would be really appreciated, i'm
> lost!
> > > >
> > > > Thanks so much!
> > > >
> > > >
> > > > System.UInt32 Length;
> > > > System.Byte HeaderVersion;
> > > > BioAPI_BIR_DATA_TYPE Type;
> > > > System.UInt16 FormatOwner;
> > > > System.UInt16 FormatID;
> > > > System.Byte Quality; /*INT8 BioAPI_QUALITY*/
> > > > BioAPI_BIR_PURPOSE Purpose;
> > > > BioAPI_BIR_AUTH_FACTORS FactorsMask;
> > > > System.IntPtr BiometricData;
> > > > System.IntPtr Signature;
> > > >
> > > >
> > > >
> > >
> >
> >
> >
>


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