Uploadpng problem! (asp code)

Hi! evryone!
My cody is run nice but the uploaded png is black and size is only 3bytes.
I want to know what difference between webpage form and wwwform when uploadfile! Thanks!
screen.js

var screenShotURL= "http://*.*.*.*/screenshot.asp"; 

// Take a screen shot immediately 
function Start() 
{ 
   print("uping..."); 
   UploadPNG(); 
} 
function UploadPNG() 
{ 
// We should only read the screen after all rendering is complete 
yield WaitForEndOfFrame(); 
 var width = Screen.width; 
var height = Screen.height; 
(Screen.width, Screen.height, 24); 
// Create a texture the size of the screen, RGB24 format 

var tex = new Texture2D( width, height, TextureFormat.RGB24, false ); 

// Read screen contents into the texture 
tex.ReadPixels( Rect(0, 0, width, height), 0, 0 ); 
tex.Apply(); 

// Encode texture into PNG 
var bytes = tex.EncodeToPNG(); 
Destroy( tex ); 
//File.WriteAllBytes(Application.dataPath + "/../Temp/SavedScreen.png", bytes); 

// Create a Web Form 
var form = new WWWForm(); 
//form.AddField("filepath", "screenshot_img"); 
form.AddBinaryData("fileUpload", bytes, "screenShot.png", "image/png"); 

// Upload to a cgi script 
var w = WWW(screenShotURL, form); 
yield w; 
if (w.error != null) 
{ 
   print(w.error); 
} 
else 
{ 
   print(w.data); 
} 
}

screenshot.asp

<% 

      dim filePath:filePath=server.MapPath("/")"\screenshot_img/" ' save path 
      dim lf:lf=chrB(13)&chrB(10)  
          
      dim hct:hct=request.ServerVariables("CONTENT_TYPE") ' the file type 
            'response.write "request.ServerVariables("CONTENT_TYPE"): " 
            'response.write hct 
      dim bTotal ' bytes size 
            bTotal=cLng(request.TotalBytes) 
            'response.write bTotal 
        dim bRead  
            bRead=request.BinaryRead(bTotal) 
      dim bStart:bStart=instrB(bRead,lf&lf)+3 ' start pos 
         'response.Write bStart 
      dim cTy:cTy=binToStr(midB(bRead,1,bStart-1)) ' Field head info 
         'response.Write cTy 
      dim fieldMarker '  Field marker 
            fieldMarker=leftB(bRead,inStrB(bRead,chrB(13))-1) 
              
        dim cDesc '  Field desc info 
            cDesc=fRegExpSgl(cTy,true,true,true,"[\s\S]*?Content-Disposition\: (.*?)\;[\s\S]*","$1") 
              
        dim fldName ' Field name 
            fldName=fRegExpSgl(cTy,true,true,true,"[\s\S]*?name\=\""(.*?)""[\s\S]*","$1") 
            'response.Write fldName 
        dim fileName 
            fileName=fRegExpSgl(cTy,true,true,true,"[\s\S]*filename\=""(.*?)""[\s\S]*","$1") 
            'response.Write fileName 
        dim cTp 'MIME type desc 
            cTp=fRegExpSgl(cTy,true,true,true,"[\s\S]*?Content-Type\:(.*?)","$1") 
            'response.Write cTp 
        dim bEnd ' end pos 
            bEnd=inStrB(bStart+6,bRead,fieldMarker)-bStart-3 
      '''''''''''''''''''''''''''''''''''''''''''''''''''''' 
      ''''''''''''''''''''''''''''''''''''''''''''''''''''''    
      dim stm  
        set stm=createObject("adodb.stream") 
            stm.type=1 
            stm.mode=3 ' read and write mode 
            stm.open 
            stm.write bRead 
          
            dim fromStm 
            set fromStm=createOBject("adodb.stream") 
                with fromStm 
                    .type=1 
                    .mode=3 
                    .open 
                    stm.position = bStart 
                    stm.copyTo fromStm, bEnd 
                    .saveTofile filePath&fileName,2 ' save file overwrite mode 
                    .close 
                end with 
            set fromStm=nothing 
      
            stm.close 
        set stm=nothing 
      response.Write("update ok") 
      '''''''''''''''''''''' 
      '''''''''''''''''''''' 
      function fRegExpSgl(str,glb,igc,mtl,pt,rpt) 
            dim re 
            set re=new RegExp 
                re.global=glb 
                re.ignoreCase=igc 
                re.multiline=mtl 
                  
                re.pattern=pt 
                fRegExpSgl=re.replace(str,rpt) 
            set re=nothing 
        end function 

      private function binToStr(bin) 'bytes to  string (bmp|gif|png|jpg) 
        
            dim i, iByt, sByt, bLen:bLen=lenB(bin) 
            for i=1 to bLen 
                sByt=midB(bin,i,1):iByt=ascB(sByt) 
                if iByt<128 then 
                    binToStr=binToStr&chr(iByt) 
                else:i=i+1 
                    if i<=bLen then binToStr=binToStr&chr(ascW(sByt&sByt)) 
                end if 
            next  
        end function 
%>

Does anyone have some ASP VBScript code that upload a PNG from unity and saves it on their server?

waiting! who can help me! :shock: