Binary data to a user defined type

Hello,

I have a problem with converting binary data to a user defined type in vb6.0

I have tried to use the RtlMoveMemory function:
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDst As Any, pSrc As Any, ByVal ByteLen As Long)

this way:
CopyMemory ByVal VarPtr(TransTabType), ByVal VarPtr(rs.Fields("NET_MSG")), Len(rs.Fields("NET_MSG")

where TransTabType is a user-defined type:
Private Type TransTab
in_out As Integer
node_id As Integer
group_id As Integer
vogn_id As Integer
koding As Integer
retry As Integer
seq_no(0 To 9) As Byte
trans_type As Integer
error_no As Integer
status_ok As Integer
count_send_no As Integer
channel_no As Integer
base_id As Integer
lengtext As Integer
last_send_time As Long
info_text() As Byte
End Type

And rs.Fields("NET_MSG") is binary data recived from a database.

When I try to run this, the user defined type just got rubbish data.
If the data was in a binary file I could hav used GET function, but in my case
I receive it from a sql database.

Anyone have any ideès, so please help me..?

Best Regards
Paal Fredrik

What data type is the field "NET_MSG" exactly?
The only problem I'd see is the info_Text() as Byte which is a dynamic type. I'm not sure if that's good in a UDT

Unless the source data has exactly the same structure as the destination data structure, you cannot just use Copymemory. You must assign that data part individually like assigning a particular variable to a UDT element.

And just like what WoF have observed, this "info_Text() as Byte" which part of your UDT, will prevent you from moving data "by blocks" because being a dynamic array, they dont always have the same sizes.

It may be permissible to use dynamic array inside a UDT but it will always be at the cost of assigning values individually. And besides -- by the way -- it will work only when manipulating in memory -- not from a file source.

Yes. The dynamic array would be only a pointer within the structure, counting 4 bytes while the actual array data is elsewhere in memory and does not count to the length of the structure.