Trouble when using extern on winapi

BlitzMax Forums/BlitzMax Programming/Trouble when using extern on winapi

Perturbatio

(Posted 2005) [#1]

When using SystemParametersInfo, I am having trouble defining multiple uses of the same function.

i.e. the pvParam value is a pointer for most uses of the function, but an Int when using something like SPI_SETMOUSESPEED.

I have worked around it just now with:

Extern "win32"
  Function SystemParametersInfoA(uAction, uParam, lpvParam:Byte Ptr, fWinIni)' '= "SystemParametersInfoA"
  Function SystemParametersInfoW(uAction, uParam, lpvParam:Int, fWinIni)' '= "SystemParametersInfoW"
End Extern

But this isn't likely to be possible for other functions that don't have an ANSI and a UNICODE declaration.

marksibly

(Posted 2005) [#2]

i.e. the pvParam value is a pointer for most uses of the function, but an Int when using something like SPI_SETMOUSESPEED.

This is not a bug - Max doesn't do function overloading.

You'll have to either cast the parameter to the appropriate type (as you'd have to do in C/C++) or, as you've done, introduce a new function.

My advice would be to declare it the same way it's declared in windows.h, and cast parameters when necessary.

Perturbatio

(Posted 2005) [#3]

yeah, sorry, should've thought a little more about it beforehand :)
my only excuse is that it was about 5:40am.