Marshaling Fixed Length Strings in Structure

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Tom Wells - 26 Jul 2004 22:09 GMT

I trying to pass this structure to a dll:

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi, Pack:=1)> _
Public Structure udtINTER01
<VBFixedString(8), MarshalAs(UnmanagedType.ByValArray, SizeConst:=8)>
Public action As Char()
<VBFixedString(7), MarshalAs(UnmanagedType.ByValArray, SizeConst:=7)>
Public equip_key As Char()
<VBFixedString(256), MarshalAs(UnmanagedType.ByValArray,
SizeConst:=256)> Public message As Char()
<VBFixedString(512), MarshalAs(UnmanagedType.ByValArray,
SizeConst:=512)> Public filler As Char()
End Structure

When I pass it to my dll I get this message:

An unhandled exception of type 'System.ArgumentException' occured in
Test1.exe
Additional Information: Type could not be marshaled because the length
of an embedded array instance does not match the declared length in the
layout

I reviewed the length of each element of the structure and they all
matched the declared lengths.

What does it want??

Tom

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Brent - 26 Jul 2004 22:13 GMT

I would not worry about the VBFixedString attribute and try

Brent

> I trying to pass this structure to a dll:
>
[quoted text clipped - 24 lines]
>
> Tom

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Tom - 27 Jul 2004 00:30 GMT

and try ... ??

and try it without the VBFixedString(?) part?

Tom

> I would not worry about the VBFixedString attribute and try
>
[quoted text clipped - 28 lines]
>>
>>Tom

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Tom Wells - 27 Jul 2004 13:46 GMT

Tried it. Doesn't make any difference. I still get the same result.
What does it want?

Tom

> I would not worry about the VBFixedString attribute and try
>
[quoted text clipped - 28 lines]
>>
>>Tom

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Marshaling Fixed Length Strings in Structure

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