waveOutOpen test

/* WATCOM=/opt/watcom PATH=$WATCOM/binl:$PATH INCLUDE=$WATCOM/h:$WATCOM/h/win LIB=$WATCOM/lib286:$WATCOM/lib286/dos wcl -bcl=windows main.c -q mmsystem.lib */

#include <windows.h>
#include <mmsystem.h>
#include <stdlib.h>

void error(const char* str)
{
    MessageBox(0, str, "", 0);
    exit(1);
}

void CALLBACK _export waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2)
{
}

int PASCAL WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    HWAVEOUT hout;
    PCMWAVEFORMAT format;
    int result;
    FARPROC callback;

    callback = MakeProcInstance((FARPROC)waveOutProc, hInstance);
    if (callback == NULL)
    {
        error("MakeProcInstance failed");
    }

    if ((result = waveOutOpen(&hout, WAVE_MAPPER, (LPWAVEFORMAT)&format, (DWORD)callback, 0, CALLBACK_FUNCTION)) != MMSYSERR_NOERROR)
    {
        char errorMsg[256];
        waveOutGetErrorText(result, errorMsg, sizeof(errorMsg));
        error(errorMsg);
    }
    error("Success");
    return 0;
}