Lib: The DLL App: A Visual Basic application that uses the DLL BrickOS: A BrickOS program with which the PC-based app can communicate ...

For Visual Basic applications (or applications in other languages such as Pascal or Fortran) to call functions in a C/C++ DLL, the functions must be exported using the correct calling convention ...

You probably need to declare area() as PASCAL calling convention and with the EXPORT macro so that it is, indeed, exported from your DLL. You'll also have to defeat C++ "name-mangling", so define it ...

When I registered dao350.dll with regsvr32 and tried opening Visual Basic, it gave me an error: "Unexpected error; quitting"<BR><BR>I don't have the original installation disks, so I can't reinstall.

Many hobbyists use their PCs to control circuits via an I²C interface. In this article, we show how the necessary programming can be made considerably easier with the help of a simple interface card ...