Ben Voigt [C++ MVP]

"jacky" <jfrieskeNoSPam@poczta.onet.pl> wrote in message
news:fjtfdk$gmp$1@news.onet.pl...
> Hi
> I've got a dll written in c++ with header like this:
>
> class __declspec (dllexport) CPrnDrv
> {
> private:
>
> static int licz_wywolan;
> HANDLE hPort;
>
> BOOL PrintPortOpen (LPTSTR lpszPortName);
> BOOL PrintPortClose ();
> bool WritePort(prnstr str); public:
>
>
> DWORD dwError;
>
>
> CPrnDrv();
> ~CPrnDrv();
>
> bool InitPrinter(LPTSTR lpszPortName, int PageLength);
> void ExitPrinter();
>
> bool WritePort(BYTE *Byte, DWORD Size, LPDWORD wNumBytesWritten);
> bool ReadPort (BYTE *Byte, DWORD Size, LPDWORD dwNumBytesRead);
> };
>
> How can I import this dll (VS2005 C#) and use functions InitPrinter and
> WritePort?

You can't. C++ classes are not compatible with any other language.

Your only hope is to write a C++/CLI wrapper function which exposes .NET
types which C# can use. However, to do so you must use the exact same
compiler version as the original DLL, as dllexport-ed classes are not at all
portable.

In summary -- it's not likely to work unless you can get the original source
code and fix the mistake of using dllexport on a class.