Thread: visual c++ dll error, how you fix?

I just need some help figuring out how to fix this. the dll is inpout32.dll and it has a corresponding lib file. this is a windows forms application (io.cpp) in its infancy.

Here is the error:

Code:

------ Build started: Project: io, Configuration: Debug Win32 ------
Compiling...
io.cpp
k:\program files\io\io\io\Form1.h(320) : warning C4441: calling convention of '__stdcall ' ignored; '__clrcall ' used instead
k:\program files\io\io\io\Form1.h(321) : warning C4441: calling convention of '__stdcall ' ignored; '__clrcall ' used instead
Linking...
io.obj : error LNK2020: unresolved token (06000004) io.Form1::Inp32
io.obj : error LNK2020: unresolved token (06000005) io.Form1::Out32
K:\Program files\io\io\Debug\io.exe : fatal error LNK1120: 2 unresolved externals
Build log was saved at "file://k:\Program files\io\io\io\Debug\BuildLog.htm"
io - 3 error(s), 2 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

and here is the code I tried to use that brought the error up:

Code:

	int reg;
	reg=Inp32(378);

	short _stdcall Inp32(short PortAddress);
	void _stdcall Out32(short PortAddress, short data);

It appears to me you are trying to use the __stdcall calling convention in a managed ref class. The calling convention for ref classes is __clrcall.

if there is a better way please tell me how.
I am using inpout32 because I can find no other way to do what I am trying to do.
I am trying to read the pin IO then set individual out pins to I or O. the idea is to control a machine from the port. The machine will read individual pins and act accordingly, thus controlling 8 separate functions independently, details aside. it will give feedback through the input pins. with xp a driver is needed to access the pins. I don't know of any free drivers that will allow this except inpout32.

I would like to do it all through the usb port but I don't know how to do the electronics for that, nor do I know how to program for usb.

I have built port pin IO programs for linux and dos but windows is what i need now

Not quite sure how that generated a __clrcall warning. Perhaps the compiler is confused.