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I made a post recently about using Barbecue barcode software in ColdFusion. In my example I instantiated the CFC object and called the getCode128 function as the source of an image tag. With a bit of experimentation you will find that although this produces an image… that’s ALL it produces. Why? Cause we essentially hijack the content type of ColdFusion’s output buffer and set it to image/jpeg. It removes all other content from the buffer, and only sends over the image. The fix?
The Component
<cfcomponent>
<cffunction name="getCode128" returntype="any" access="remote" output="true">
<cfargument name="data" type="string" required="true" />
<cfsetting showdebugoutput="false">
<cfscript>
outStream = createObject("java", "java.io.ByteArrayOutputStream").init();
//-----------------------------------------------------------
// Create the barcode, and draw it to a buffered image class.
//-----------------------------------------------------------
barcode = createObject("java", "net.sourceforge.barbecue.BarcodeFactory").createCode128("#arguments.data#");
bufferedImage = createObject("java", "net.sourceforge.barbecue.BarcodeImageHandler").writeJPEG(barcode, outStream);
</cfscript>
<!--- Return the information as streaming bytes of type image/jpeg --->
<cfset getPageContext().getOut().clearBuffer()><cfcontent type="image/jpeg" variable="#outStream.toByteArray()#"><cfreturn>
</cffunction>
</cfcomponent>Usage
<cfoutput>
<img src="barcode.cfc?method=getCode128&data=My First Barcode" />
</cfoutput>So, as you can see in this case I am calling the CFC method remotely in the image source attribute forcing a separate HTTP request. This also required me to make the access to the getCode128 function to remote. Hope it helps! Cheers!