.NET (Core and Framework)

TremaHD wrote:

do you mean that because the DLL has been written in C++ it can't be exported to DotNet?

#define API_SPEC     __declspec(dllexport)
void API_SPEC API_getApiVersion (std::wstring *version) //[out] API release ID

MicroVirus wrote:

I think the solution here is to use the COM interoperability provided by dotNET.

 <DllImport("C:\Api.dll", EntryPoint:="?API_getApiVersion@@YAXPAV?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@@Z", CallingConvention:=CallingConvention.ThisCall, CharSet:=CharSet.Unicode)> _
    Public Shared Sub test(ByRef version As StringBuilder)
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim theVersion As StringBuilder = New Stringbuilder(20)
        Call test(theVersion )
        MessageBox.Show(theVersion.tostring)
    End Sub
End Class

Md Saleem Navalur wrote:

One option is to change the varchars to nvarchars. This increases the Db size by 50%.
The existing users of the app would not want to have this, with no tangible benefit.

Md Saleem Navalur wrote:

Is it possible to have 2 sets of Db, one for existing customers and another for new customers (with nvarchar)
with the same code base, or some minor modifications to the code?

Md Saleem Navalur wrote:

s it possible to have 2 sets of Db, one for existing customers and another for new customers (with nvarchar)
with the same code base, or some minor modifications to the code?