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Send image through multipart/form-data POST request

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I'm trying to automate a form submission (http://prodavalnik.com/adding/). It's multipart/form-data POST request.
There is no problem when submitting it through POSTMAN Chrome extention. What I want is to make it fully automate so I tried to write it on Autoit. 
 I've succeded submitting the form without image data attached. Seems like encoding of the image is not as server expects. Tried different ways, but for the moment i can't upload image through this form automation. 


Here is a sample from the code: 

Func HttpPost($sURL, $sData = "", $sCookie = "")
Local $oHTTP = ObjCreate("WinHttp.WinHttpRequest.5.1")
$oHTTP.Open("POST", $sURL, False)
If (@error) Then Return SetError(1, 0, 0)
 $oHTTP.SetRequestHeader("Host", "prodavalnik.com")
 $oHTTP.SetRequestHeader("Content-Type", "multipart/form-data; boundary=----xxx")
$oHTTP.SetRequestHeader("Cookie", $sCookie)
If (@error) Then Return SetError(2, 0, 0)
If ($oHTTP.Status <> $HTTP_STATUS_OK) Then Return SetError(3, 0, 0)
Return SetError(0, 0, $oHTTP.ResponseText)

Func SendAd($multipartFileName, $imageFileName)
Local $multipartFile = FileOpen($multipartFileName, 128)
Local $imageFile = FileOpen($imageFileName, 16)
Local $postData = FileRead($multipartFile) & @CRLF & @CRLF & FileRead($imageFile) & @CRLF & "------xxx--"
HttpPost("http://prodavalnik.com/adding/", $postData, "PHPSESSID=xxx")

SendAd("test.txt", "test.jpg")

Sorry for the awful english. 

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