Now I am not exactly sure if this is against the rules. (As Canon does not want you reverse engineering their tools to write your own. And don't offer there SDKs to the general public.) So if it sorry and you can promptly lock this.
I came back to AutoIt after a good 5 years just to be able to control my Canon EOS Rebel Camera for the eclipse (August 21, 2017) and the following is what I have done as a "api" to their graphical interface for the camera.
#include <String.au3>
#include <Array.au3>
Local Const $exposures = StringSplit("BULB|30 Sec|25 Sec|20 Sec|15 Sec|13 Sec|10 Sec|8 Sec|6 Sec|5 Sec|4 Sec|3.2 Sec|2.5 Sec|2 Sec|1.6 Sec|1.3 Sec|1 Sec|0.8 Sec|0.6 Sec|0.5 Sec|0.4 Sec|0.3 Sec|1/4 Sec|1/5 Sec|1/6 Sec|1/8 Sec|1/10 Sec|1/13 Sec|1/15 Sec|1/20 Sec|1/25 Sec|1/30 Sec|1/40 Sec|1/50 Sec|1/60 Sec|1/80 Sec|1/100 Sec|1/125 Sec|1/160 Sec|1/200 Sec|1/250 Sec|1/320 Sec|1/400 Sec|1/500 Sec|1/640 Sec|1/800 Sec|1/1000 Sec|1/1250 Sec|1/1600 Sec|1/2000 Sec|1/2500 Sec|1/3200 Sec|1/4000 Sec","|")
Local Const $ISOS[6] = ["AUTO","100","200","400","800","1600"]
Func Capture()
ControlClick(" EOS DIGITAL","","[NAME:takePictureButton]")
EndFunc
Func BULB()
ControlSend(" EOS DIGITAL","","[NAME:olcTv]","{DOWN}")
EndFunc
Func SetExposure($cur,$expos)
$index = _ArraySearch($exposures,$expos)
$index1 = _ArraySearch($exposures,$cur)
If $index-$index1 < 0 Then
ControlSend(" EOS DIGITAL","","[NAME:olcTv]",_StringRepeat("{Left}",$index1-$index))
Else
If $index-$index1 > 0 Then
ControlSend(" EOS DIGITAL","","[NAME:olcTv]",_StringRepeat("{RIGHT}",$index-$index1))
EndIf
EndIF
EndFunc
Func GUICtrlGetBkColor($hWnd)
Local $hDC = _WinAPI_GetDC($hWnd)
Local $iColor = _WinAPI_GetPixel($hDC, 10, 10)
_WinAPI_ReleaseDC($hWnd, $hDC)
Return Hex($iColor,6)
EndFunc
Func CheckWarning()
$i = GUICtrlGetBkColor(ControlGetHandle(" EOS DIGITAL","","[NAME:ledWarning]"))
Return $i == "E80000"
EndFunc
Func SetAutoISO()
ControlSend(" EOS DIGITAL","","[NAME:olcIso]","{DOWN}")
EndFunc
Func SetISO($iso)
SetAutoISO()
ControlSend(" EOS DIGITAL","","[NAME:olcIso]",_StringRepeat("{RIGHT}",_ArraySearch($ISOS,$iso)))
EndFunc
Now I know there are probably many problems with this. (Namely the first Const... ) And possibly some other areas that are just not logical. But bear in mind I am uploading this on the 20th after spending 2 days relearning AutoIt after 5 years of using Java and Python.
Any improvements would be nice. (I have a lot I need to add still.) I can also work on a way to return the captured image.