I've managed to put together an XS module which is an interface to the Windows MessageBox function (my ultimate goal is to speak to the System Tray). The XS code: 
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "ppport.h"

#include "windows.h"

MODULE = Mytest    PACKAGE = Mytest

int
hello(input)
unsigned int input
    CODE:
        int x=MessageBox(NULL,TEXT("Text"),TEXT("Caption"),input);
        
        RETVAL=x;
    OUTPUT:
        RETVAL

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This code works. However if I want to use the 'UINT' data type (which is in the original declaration of the function) instead of 'unsigned int' the make fails: 
Error: 'UINT' not in typemap in Mytest.xs, line 12
Please specify prototyping behavior for Mytest.xs (see perlxs manual)

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The perlxs manual says that prototypes can be enabled and disabled but I find no guidance for how to use a predefined C prototype.

In reply to Prototype problem for XS module by chessgui

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