Monday, November 08, 2010 at 12:04 AM.

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system.verbs.builtins.mainResponder.discuss.buildImageTag

on buildImageTag (msgNum) {
	<<Given a message number, build the image tag.
		<<This works for new-style image management, where the images are stored in the dg in an image subtable.
		<<An image in a dg message table has the following elements:
			<<bits, the binary data.
			<<height, the height in pixels of the image.
			<<width, the width in pixels of the image.
			<<mimeType, the MIME type of the image (not referenced in this script).
		<<This feature requires an imageViewer element in the #urls table. This should be a URL to a script which takes a msgNum as pathArgs, as in http://mysite.com/picture$. This script returns the actual image data with MIME type specified in the response headers.
		<<10/20/99; 11:18:55 AM by PBS
		<<Changes:
			<<02/29/00; 10:47:20 PM by PBS
				<<If the image has been written to disk, the URL is stored in the image subtable. Use that URL instead of calculating the URL.
			<<04/10/00; 3:02:46 PM by JES
				<<Localized -- The alt element had a colon in it. Now it's looked up.
			<<05/01/00; 2:19:46 PM by JES
				<<Changed getString call that used a replacement list, so that it passes a replacementTableAddress instead.
	
	local (pta = html.getPageTableAddress ());
	local (adrMsgTable = mainResponder.discuss.getMessageTable (msgNum));
	
	if not defined (pta^.responderAttributes.urls^.imageViewer) { //check for imageViewer in #urls table
		return ("")}; //return empty string, can't build an img tag
	
	if not defined (adrMsgTable^.image) { //check for image subtable
		return ("")}; //return empty string, can't build an img tag
	
	local (imgTag = "<img src=\"");
	local (url = pta^.responderAttributes.urls^.imageViewer + adrMsgTable^.msgNum);
	if defined (adrMsgTable^.image.url) { //PBS 02/29/00: if the image is on a static server, use that URL instead of the calculated URL
		url = adrMsgTable^.image.url};
	imgTag = imgTag + url + "\" ";
	imgTag = imgTag + "height=\"" + adrMsgTable^.image.height + "\" ";
	imgTag = imgTag + "width=\"" + adrMsgTable^.image.width + "\" ";
	imgTag = imgTag + "border=\"0\" ";
	
	local (altText, replacementTable);
	new (tableType, @replacementTable); // 05/01/00 JES: build replacement table for getString
	replacementTable.msgsubject = adrMsgTable^.subject;
	replacementTable.msgbody = adrMsgTable^.body;
	altText = mainResponder.getString ("discuss.imageAltText", @replacementTable);
	altText = string.replaceAll (altText, "\n", " "); //make sure the alt text can appear in an img tag
	altText = string.replaceAll (altText, "\r", " ");
	altText = string.replaceAll (altText, "\"", """);
	imgTag = imgTag + "alt=\"" + altText + "\">";
	
	return (imgTag)}

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This listing is for code that runs in the OPML Editor environment. I created these listings because I wanted the search engines to index it, so that when I want to look up something in my codebase I don't have to use the much slower search functionality in my object database. Dave Winer.