On Mon, Feb 2, 2009 at 8:26 AM, bacoms <googlebr...@balfour.me.uk> wrote:
> I've got a web page that includes a graph. I achieve this with code > that looks like: > > print "Content-type: text/html\n\n"; > etc > etc > my($myImage) = $myChart->plot(\...@data) or die $myChart->error; > > open(IMAGE, ">Images/zzzgraph.png") or die $!; > binmode IMAGE; > print IMAGE $myImage->png; > close IMAGE; > > print " <img src='Images/zzzgraph.png' width='800' > height='600'>\n"; > > Is it possible to eliminate the need to first write the image to > disk? > > All my attempts at trying this have all failed. The best I get is with > the following code: > > print "Content-type: text/html\n\n"; > etc > etc > my($myImage) = $myChart->plot(\...@data) or die $myChart->error; > print $myImage->png; > > which produces gibberish where the chart should be. (cribbed from > http://linuxgazette.net/issue83/padala.html ) > > I suspect is that this specifies "Content-type: image/png\n\n" whereas > my web page specifies "Content-type: text/html\n\n". > > I've tried specifying both content-types on my web page but this > results on the user being asked if they want to save the script > (??????). > > Can it be done and how???? > The issue is that you cannot return the image embedded in the HTML. You can write a CGI script that returns an image (only), though. You are correct that this would use the png content type. Therefore, to construct a page that contains an image within HTML, your page would return HTML that includes an img tag that has your CGI for image production as the source. Sean
