How to pass UDT to a C++ DLL which contains Arrays

My problem is,

UDT:


public Type mwin6_tbl
kda(69) as string * 84
KMax as Integer
kdax as string * 319
kdl as Integer
kpl as Integer
kpl2 as Integer
kxpc as Integer
kbnflg as string * 2
posflg as Integer
jobflg as Integer
endflg as Integer
null as string * 1
End Type

public mwin6 as mwin6_tbl

public const mwin6Size = 5218 '(This value I want to know exactly how many bytes -the above UDT)


Declare Function msetenv Lib "c:\windows\system\AUTOCALC.DLL" (win6 as Byte) as Integer
Declare Sub CopyMemory Lib "Kernel32" Alias "RtlMoveMemory" ( lpvDest as Any, lpvSource as Any, byval cbCopy as Long)



Declare Function msetyouind Lib "c:\windows\system\AUTOCALC.DLL" (ind1 as
Byte) as Integer

public sub mysub()

Ret% = Fmsetyouind()

End Sub



public Function Fmsetyouind() as Integer

Dim mwin6byte() as Byte

ReDim mwin6byte(mwin6Size) as Byte

CopyMemory mwin6byte(0), mwin6, mwin6Size
Ret% = msetyouind(mwin6byte(0))
CopyMemory mwin6, mwin6byte(0), mwin6Size

If Ret% = 0 then ER% = 1: GoTo ERMSG1
Fmsetyouind = 1

ERMSG1:
Exit Function

End Function






But my code is giving error. VB is geting crashed soon after accessing the DLL.

Can you please help me out how to solve my problem, I am already crossed my deadline of the project.



Ramaswamy

Using the LenB command in VB gives 12420 bytes i.e.:


private Type mwin6_tbl
kda(69) as string * 84
KMax as Integer
kdax as string * 319
kdl as Integer
kpl as Integer
kpl2 as Integer
kxpc as Integer
kbnflg as string * 2
posflg as Integer
jobflg as Integer
endflg as Integer
null as string * 1
End Type

private Sub Form_Load()

Dim x as mwin6_tbl

Debug.print LenB(x) & " bytes "

End Sub





HTH,
Duncan

-------------------------------------------------
Ex. Datis: Duncan Jones
Merrion Computing Ltd
http://www.merrioncomputing.com