Chang,

Do you have Visual Studio 6? If so search the MSDN help on DeviceIOControl there's 107 hits in there. That API looks callable from VFP because there's no pointers involved. Frankly though I'd call it from a VC++ DLL that VFP can call. VC++ is much better suited for calling the API you are trying to use.


> David, do you remember me? Do you know how to access the DeviceIOControl() by call WIn32 API form VFP5?
>The DeviceIOControl() which is the function of visual c++ allow to communicate to teh device driver (VxD). I have write a VxD for my custom I/O card and wish to use VFP5 to be my front end application. Can i do it ?