Crop Method with Javascript

Marc · **Joined:** Mon Aug 30, 2010 4:14 am **Posts:** 2

Hi,

I'm evaluating Dynamic Web Twain 6.0 and I can't get the Crop method to work using Javascript.
My code looks like this:

Code:

try {
   if (!dynamicWebTwain.Crop(0, 20, 20, 20, 20)) {
      alert ("failed: " + dynamicWebTwain.ErrorString + " code: " + dynamicWebTwain.ErrorCode);
   }
} catch (e) {
   alert ("ERROR: " + e);
}

dynamicWebTwain is the proper object for the plug-in or the activeX control and there is an image in buffer.
If I use the Plug-in with Firefox the Crop method returns false and the if-block is entered, but the error string is empty and the error code is 0.
If I use the ActiveX control with IE8 the crop method throws an exception without any description.

Regards,
Marc

Catherine · **Joined:** Tue Mar 08, 2005 12:23 am **Posts:** 1075

Hi Marc,

For info on how to use the Crop method, please refer to:
http://www.dynamsoft.com/help/TWAIN/Web ... 20Crop.htm

In the method, you need to set different values for the two pairs of parameters below:
Long left and Long right; Long top and Long bottom

To use the method more flexibly, you can call it in the event OnImageAreaSelected as below:

Code:

var index, iLeft, iTop, iRight, iBottom;
function DynamicWebTwain_OnImageAreaSelected(index, iLeft, iTop, iRight, iBottom) 
{
   try {
         if (!DynamicWebTwain.Crop(index, iLeft, iTop, iRight, iBottom)) {
         alert ("failed: " + DynamicWebTwain.ErrorString + " code: " + DynamicWebTwain.ErrorCode);
   }
   } 
    catch (e) {
         alert ("ERROR: " + e);
   }
}

<script language="javascript" type="text/javascript" event="OnImageAreaSelected(index, iLeft, iTop, iRight, iBottom)" for="DynamicWebTwain">
      <!--
         DynamicWebTwain_OnImageAreaSelected(index, iLeft, iTop, iRight, iBottom);
      //-->
</script>

Best regards.

Marc · **Joined:** Mon Aug 30, 2010 4:14 am **Posts:** 2

Hi Catherine,

thanks for the reply. Using the same values for each corner is a bad idea, of course

.
It works fine with the correct values.

Thanks & best regards.
Marc

Catherine · **Joined:** Tue Mar 08, 2005 12:23 am **Posts:** 1075

Hi Marc,

Glad to know the method is working for you!

Should you need any further help, you can write us at TWAINSupport@dynamsoft.com

Best regards.

Dynamsoft TWAIN Products

Crop Method with Javascript

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