;;"#defines"
DeviceID := 0
CALLBACK_WINDOW := 0x10000


#NoEnv
SendMode Input
SetWorkingDir %A_ScriptDir%
#Persistent

Gui, +LastFound
hWnd := WinExist()



MsgBox, hWnd = %hWnd%`nPress OK to open winmm.dll library

OpenCloseMidiAPI()
OnExit, Sub_Exit


MsgBox, winmm.dll loaded.`nPress OK to open midi device`nDevice ID = %DeviceID%`nhWnd = %hWnd%`ndwFlags = CALLBACK_WINDOW

hMidiIn =
VarSetCapacity(hMidiIn, 4, 0)

result := DllCall("winmm.dll\midiInOpen", UInt,&hMidiIn, UInt,DeviceID, UInt,hWnd, UInt,0, UInt,CALLBACK_WINDOW, "UInt")

If result
{
	MsgBox, error, midiInOpen returned %result%`n
	GoSub, sub_exit
}

hMidiIn := NumGet(hMidiIn) ; because midiInOpen writes the value in 32 bit binary number, AHK stores it as a string


MsgBox, Midi input device opened successfully`nhMidiIn = %hMidiIn%`n`nPress OK to start the midi device

result := DllCall("winmm.dll\midiInStart", UInt,hMidiIn)
If result
{
	MsgBox, error, midiInStart returned %result%`n
	GoSub, sub_exit
}


;	#define MM_MIM_OPEN         0x3C1           /* MIDI input */
;	#define MM_MIM_CLOSE        0x3C2
;	#define MM_MIM_DATA         0x3C3
;	#define MM_MIM_LONGDATA     0x3C4
;	#define MM_MIM_ERROR        0x3C5
;	#define MM_MIM_LONGERROR    0x3C6

OnMessage(0x3C1, "midiInHandler")
OnMessage(0x3C2, "midiInHandler")
OnMessage(0x3C3, "midiInHandler")
OnMessage(0x3C4, "midiInHandler")
OnMessage(0x3C5, "midiInHandler")
OnMessage(0x3C6, "midiInHandler")

return


sub_exit:

If (hMidiIn)
	DllCall("winmm.dll\midiInClose", UInt,hMidiIn)
OpenCloseMidiAPI()

ExitApp

;--------End of auto-execute section-----
;----------------------------------------


OpenCloseMidiAPI() {
   Static hModule 
   If hModule 
      DllCall("FreeLibrary", UInt,hModule), hModule := "" 
   If (0 = hModule := DllCall("LoadLibrary",Str,"winmm.dll")) { 
      MsgBox Cannot load library winmm.dll 
      ExitApp
   } 
} 



midiInHandler(hInput, midiMsg, wMsg) 
{
	statusbyte := midiMsg & 0xFF
	byte1 := (midiMsg >> 8) & 0xFF
	byte2 := (midiMsg >> 16) & 0xFF

	ToolTip,
	(
Received a message: %wMsg%
wParam = %hInput%
lParam = %midiMsg%
	statusbyte = %statusbyte%
	byte1 = %byte1%
	byte2 = %byte2%
	)

}

Esc::GoSub, sub_exit