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One what like do you get this? Debug your application and find out exactly where the error is happening. Microsoft MVP, Visual C# My Articles

OK! [DllImport("fplib.dll", EntryPoint="FPMGetImage", SetLastError=true, CharSet=CharSet.Ansi, ExactSpelling=true, CallingConvention=CallingConvention.StdCall)] public static extern int FPMGetImage([In, Out] byte[] buffer); This code run perfectly! THANKS FOR ALL!! Matthew Hazlett wrote: I asked somthing like this the other day, heres what Heath Stewert told me: >Instead of passing byte* as the parameter, declare your parameter using either ref or out >for value types (like a Byte). This is the most common method. > >For instance, if the C functions is declared like so:void SomeFunc(byte* b); >...declare your method like so:[DllImport("...")]private static extern void SomeFunc(ref byte b); >Microsoft MVP, Visual C# >My Articles Matthew Hazlett Windows 2000/2003 MCSE Never got an MCSD, go figure... Alexsander "Axia" Antunes

The API Viewer just displayed some of the Win32 functions in VB form once it was supplied a text file. So far, no tools have been written that do something similar for any .NET languages (to my knowledge). Some Microsoft employees have discussed this idea (via their blogs) of creating a tool, however it has been deemed too time consuming. If you are using C# (I am assuming this since you are in the C# forum) you will need to P/Invoke the Win32 method signatures to call them from C#, VB.NET or any .NET language in particular. Read into the DllImportAttribute Class[^] for more information. - Nick Parker   My Blog