reference object attachement

Question

So i have an object which holds an attachment. this object is pretty much an invoice and has the option to be turned into a pdf document for printing purposes. the invoice will hold an image as an attachment within itself. now i need to figure out how to make the image show up on the pdf? the pdf is a visual force page with renderAs="pdf" on it i need to kno how to reference the attachment of any invoice object when i click the "Print PDF" button on any individual invoice.

Help Please

Answer 1

assuming there's only one Attachment related to the invoice, this will do the trick

<apex:page standardController="Invoice__c" renderAs="PDF">

  <apex:repeat value="{!Invoice__c.Attachments}" var="a">
     <apex:image
       height="200px"
       value="{!URLFOR($Action.Attachment.Download, a.Id)}"/>

     <apex:outputText value="{!a.Name}"/>

  </apex:repeat>

</apex:page>

Answer 2

In your visualforce page, you would simply need to make reference to the URL of the Image, for example:

<img src="/servlet/servlet.FileDownload?file=015b00000005mrz"/>

Where /servlet/servlet.FileDownload?file=015b00000005mrz is a reference to an Image stored as a Document within Salesforce.

You need to make sure your image is externally available I believe.