strucure with buffer

[Ralph Heger]

Hi

An API-Function I want to use needs a structure as parameter:

public structure myStruct
dim i1 as short
dim i2 as byte
dim i3 as integer
dim buffer as byte()
end structure

buffer is an array of fixed length. But how could I correctly declare
buffer, so that is really behind i3 in memory? <VBFixedArray(5 12)> doesn't
work in that case, and declaring b1, b2, b3, b4,... as byte does work, but
who wouild really want to do that.
Any ideas?

thanks

Ralph

[Ken Tucker [MVP]]

Re: strucure with buffer

Hi,

Redim buffer after you create the structure.

Dim m As myStruct
ReDim m.buffer(512)


Ken
--------------------
"Ralph Heger" <ralph.heger@so ftart.at> wrote in message
news:43422fd7$0 $11203$79720d31 @newsreader.ino de.at...[color=blue]
> Hi
>
> An API-Function I want to use needs a structure as parameter:
>
> public structure myStruct
> dim i1 as short
> dim i2 as byte
> dim i3 as integer
> dim buffer as byte()
> end structure
>
> buffer is an array of fixed length. But how could I correctly declare
> buffer, so that is really behind i3 in memory? <VBFixedArray(5 12)> doesn't
> work in that case, and declaring b1, b2, b3, b4,... as byte does work, but
> who wouild really want to do that.
> Any ideas?
>
> thanks
>
> Ralph
>
>[/color]

[Ralph Heger]

Re: strucure with buffer

Thanks, Ken

I have got a solution from an other usegroup. The problem with your solution
is, that you can't be sure that the memory that 'buffer' needs is on the
wright location. But declaring buffer with
'<MarshalAs(Unm anagedType.ByVa lArray, SizeConst := 512)>' does the job.

thanks
Ralph



"Ken Tucker [MVP]" <vb2ae@bellsout h.net> schrieb im Newsbeitrag
news:eCPlA%23My FHA.612@TK2MSFT NGP10.phx.gbl.. .[color=blue]
> Hi,
>
> Redim buffer after you create the structure.
>
> Dim m As myStruct
> ReDim m.buffer(512)
>
>
> Ken
> --------------------
> "Ralph Heger" <ralph.heger@so ftart.at> wrote in message
> news:43422fd7$0 $11203$79720d31 @newsreader.ino de.at...[color=green]
>> Hi
>>
>> An API-Function I want to use needs a structure as parameter:
>>
>> public structure myStruct
>> dim i1 as short
>> dim i2 as byte
>> dim i3 as integer
>> dim buffer as byte()
>> end structure
>>
>> buffer is an array of fixed length. But how could I correctly declare
>> buffer, so that is really behind i3 in memory? <VBFixedArray(5 12)>
>> doesn't work in that case, and declaring b1, b2, b3, b4,... as byte does
>> work, but who wouild really want to do that.
>> Any ideas?
>>
>> thanks
>>
>> Ralph
>>
>>[/color]
>
>[/color]

[Dennis]

Re: strucure with buffer

Can you use:

<StructLayout(L ayoutKind.Seque ntial)> _
Public Structure MyStructure
.....

--
Dennis in Houston


"Ralph Heger" wrote:
[color=blue]
> Thanks, Ken
>
> I have got a solution from an other usegroup. The problem with your solution
> is, that you can't be sure that the memory that 'buffer' needs is on the
> wright location. But declaring buffer with
> '<MarshalAs(Unm anagedType.ByVa lArray, SizeConst := 512)>' does the job.
>
> thanks
> Ralph
>
>
>
> "Ken Tucker [MVP]" <vb2ae@bellsout h.net> schrieb im Newsbeitrag
> news:eCPlA%23My FHA.612@TK2MSFT NGP10.phx.gbl.. .[color=green]
> > Hi,
> >
> > Redim buffer after you create the structure.
> >
> > Dim m As myStruct
> > ReDim m.buffer(512)
> >
> >
> > Ken
> > --------------------
> > "Ralph Heger" <ralph.heger@so ftart.at> wrote in message
> > news:43422fd7$0 $11203$79720d31 @newsreader.ino de.at...[color=darkred]
> >> Hi
> >>
> >> An API-Function I want to use needs a structure as parameter:
> >>
> >> public structure myStruct
> >> dim i1 as short
> >> dim i2 as byte
> >> dim i3 as integer
> >> dim buffer as byte()
> >> end structure
> >>
> >> buffer is an array of fixed length. But how could I correctly declare
> >> buffer, so that is really behind i3 in memory? <VBFixedArray(5 12)>
> >> doesn't work in that case, and declaring b1, b2, b3, b4,... as byte does
> >> work, but who wouild really want to do that.
> >> Any ideas?
> >>
> >> thanks
> >>
> >> Ralph
> >>
> >>[/color]
> >
> >[/color]
>
>
>[/color]