Handling NULL terminated strings in Visual Basic when using LANSA Open
|Product/Release:||LANSA Open - All Versions|
|Abstract:||When using DLLs with Visual Basic you need to take special care of strings because Visual Basic cannot handle strings terminated by a NULL character and all DLLs terminate strings this way.|
Like all DLLs LANSA Open uses 0 as the terminating character for strings. This however causes Visual Basic a problem as it does not recognize 0 as the terminating character in a string. Therefore you will have to remove the 0 character yourself in Visual Basic applications.
The following sample function sTrim removes any leading or trailing blanks from a given string as well as the 0 terminating character of a string.
Note: It is more efficient for sTrim to pre-allocate strings with nulls, rather than spaces.
Function sTrim(s As String) As String
' this function trims a string of right and left spaces
' it recognizes 0 as a string terminator
Dim i As Integer
i = InStr(s, Chr$(0))
If (i > 0) Then
sTrim = Trim(Left(s, i - 1))
sTrim = Trim(s)