Mix Managed code and unmanaged code

[gsmcecil]

Hi; I hv C++ program which declare a return message as LPstr datatype, when i want to add reference this C++ program and used in VB.net & i receive this message in String datatype. After built, an Type mismatch error comes out. Any one know how to convert LPstr datatype to any relevant datatype in VB.net :eek: Headache Unmanaged Code