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Questionjavascript _> activex passing by reference Pin
Johan000112-Sep-12 1:40
memberJohan000112-Sep-12 1:40 
Hi
I hope somebody can help.
Apologies if the code below is not clear ,because this is my first post/query.

Basically i   have a javascript function   that is executed on the client side using   onclientclick   in my aspx , html page.

The javascript   function   "capt(fingerpos)" below invokes the   activex   objects which is declared in the   aspx page in an object tag( see below).It is also registered in the client machine.

All the method calls work correctly , until i need to pass an array ( buf) by reference to the   method
CSDCtrlClass.GetMemoryBuffer("BMP", buf);
This   always   returns an empty array . Ive tried declaring an object (BmpObject)   and sending it to the activex   method   with the same result.

In c#( windows application)   this com object works correctly when declaring BmpObject as object ,
and the return value of (buf) is populated by the   activex method CSDCtrlClass.GetMemoryBuffer("BMP", buf);
My problem is   i cannot   understand why   this   method does not return the buffer/object   in   javascript , but does work in   a   normal windows application.

Obviously the handeling of the reference variable(   either array or object) is different   in javascript. But   i have tried many different approaches , the   return   variable is   always the same ( empty or null).
Any suggestions   on how to handle this?

The actual return data is just a block of 8 bit bytes( bmp image) when   executed in the working windows application.





html code snippet:




<object id="CSDCtrlClass" name="CSDCtrlClass"classid="CLSID:B228B13B-AD31-4523-AD58-5D52553EEC47" width="100" height="100"></object>

<script type ="text/javascript">


function capt(FingPos)
{
   var BmpObject = {};
   var buf            = new Array(200000);
              

            CSDCtrlClass.InitScannerExternal();
            CSDCtrlClass.bInitKillScannerExternal = 1;
            CSDCtrlClass.bAutoCapture = 1;
            CSDCtrlClass.OutputFileMode = 0;
            CSDCtrlClass.TransNo = "TranSample";
            CSDCtrlClass.FingPos = FingPos;
            CSDCtrlClass.OutputSaveFormat= "BMP_RAW_WSQ";
           
                  CSDCtrlClass.Capture();
                  if (CSDCtrlClass.ErrCode == -999)
                  {
                        alert("Capture Error:" + CSDCtrlClass.ErrCode);
                        return false;
                  }

                  try
                  {
                        CSDCtrlClass.GetMemoryBuffer("BMP", buf);
                        if (CSDCtrlClass.ErrCode != 0) {
                              alert("Capture Error:" + CSDCtrlClass.ErrCode);
                              return false;
                        }
                       
                                   
                        alert(buf);
                                            
                       
                       
                                             CSDCtrlClass.TerminateScannerExternal();
                  }
                  catch (err)
                  {
                        var txt = "";
                        txt = "ERROR[" + err.message + "]";
                        alert(txt);
                  }


</script>
AnswerRe: javascript _> activex passing by reference Pin
twseitex16-Sep-12 1:09
membertwseitex16-Sep-12 1:09 
GeneralRe: javascript _> activex passing by reference Pin
Johan000117-Sep-12 0:46
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GeneralRe: javascript _> activex passing by reference Pin
twseitex17-Sep-12 8:30
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GeneralRe: javascript _> activex passing by reference Pin
Johan000117-Sep-12 21:38
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GeneralRe: javascript _> activex passing by reference Pin
twseitex18-Sep-12 8:58
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GeneralRe: javascript _> activex passing by reference Pin
Johan000118-Sep-12 23:28
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GeneralRe: javascript _> activex passing by reference Pin
Johan000117-Sep-12 1:03
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AnswerRe: javascript _> activex passing by reference Pin
Manfred R. Bihy19-Sep-12 1:02
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GeneralRe: javascript _> activex passing by reference Pin
Johan000119-Sep-12 2:02
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GeneralRe: javascript _> activex passing by reference Pin
Manfred R. Bihy19-Sep-12 2:06
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GeneralRe: javascript _> activex passing by reference Pin
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