Let me just say at the top that I'm not sure I truly understand what cfcontent is doing... so bear with me if this is a stupid question.
I've been using cfcontent to stream images outside of my web root to the browser. I've decided that I now want to store the image in a variable, display it, have the ability to modify it, view those modifications, and only commit the changed variable when I'm sure I like the changes. I was thinking that I could use cfcontent to somehow stream the image from a variable, and then display, modify, re-display, and save that image from the variable. My original code was simply:
<img id="photoPlaceholder"
src="/#application.root_name#/administration/PhotoManagement/displayPhoto.cfm?thisImage=#thisImage#"
width="500px" />
and displayPhoto.cfm consisted of:
<cfcontent type = "image/*"
file = "myPathName"
deleteFile = "No" />
I see that I can read the file into a variable and stream from that variable:
<cffile action="readBinary" file="myPathName" variable="fileObject" />
<cfcontent type="image/*" variable="#fileObject#" />
but if I take the intermediate step of creating an image using
<cfimage source="fileObject" name="myImage" />
<cfcontent type="image/*" variable="#myImage#" />
then I get an attribute validation error.
Any thoughts?
If you think about it - this makes sense. Image variables aren't binary data in ColdFusion. While they may store binary data, ColdFusion wraps up the data in a new "Image" variable type.
If you're using CF9, you can try writing the image to the RAM:// drive first, serve it, and delete from RAM.