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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
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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
mvpManfred R. Bihy19-Sep-12 1:02 
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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