String Array Issue - VB 2005


P

Phoenix

Hi Friends,

Any help would be highly appreciated for the following problem :

I have a vb 6 application which makes call to an API in some dll
which returns an array of strings and no of elements in that array :

Declare Function vb_inq_applications Lib "tcvbodss.dll" (ByVal
login_handle As Integer, ByRef no_of_elements As Integer, ByRef
str_array() As String, ByRef handle As Integer) As

Integer

Dim handle As Integer
Dim no_of_elements As Integer
Dim str_array(16) As String

retcode = check_apps(login_handle, no_of_elements,
str_array(), handle)

For i = 1 To UBound(str_array)
Debug.Print str_array(i)
Next i

This code worked absolutely fine untill I upgraded this to VB 2005 .
Now str_array() is not filled with data but the no_of_elements comes
correctly , following is the upgraded code :

Declare Function vb_inq_applications Lib "tcvbodss.dll" (ByVal
login_handle As Short, ByRef no_of_elements As Short, ByRef
str_array() As String, ByRef handle As Short) As Short

Dim handle As Integer
Dim no_of_elements As Integer
Dim str_array(16) As String
ReDim str_array(16)

retcode = check_apps(login_handle, no_of_elements, str_array,
handle)

For i = 1 To UBound(str_array)
Console.WriteLine str_array(i)
Next i

I am unable to locate the PROBLEM , kindly help me to short out this
issue.
 
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B

Bill McCarthy

Hi Phoenix,

Try the following :



Declare Function vb_inq_applications Lib "tcvbodss.dll" ( _
ByVal login_handle As Int16, _
ByRef no_of_elements As Int16, _
<InAttribute(), OutAttribute(), MarshalAs(UnmanagedType.SafeArray)> ByRef
str_array() As String, _
ByRef handle As Int16) As Int16



Dim handle As Int16
Dim no_of_elements As Int16
Dim str_array(16) As String

retcode = check_apps(login_handle, no_of_elements, str_array,
handle)

For i = 0 To UBound(str_array)
Console.WriteLine str_array(i)
Next i


If that doesn't work try changing the str_array to ByVal instead of ByRef in
the vb_inq_applications declaration.

Regards,

Bill
 

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