header problem 1

[sarbruis]

i'm trying to get an image to appear, so i did:

header("Content-type: image/jpg");
imagejpeg($image);

I get the following error: Warning: Cannot modify header information - headers already sent by (output started at C:\Documents and Settings\Owner\Desktop\PHP Files, etc\-:13) in C:\Documents and Settings\Owner\Desktop\PHP Files, etc\- on line 24

thanks for any help. BTW, i solved my GD library problem.

 

[KarveR]

?

hint.

______________________________________________________________________
There's no present like the time, they say. - Henry's Cat.

 

[sarbruis]

if you mean <?php ?>, I did that; I was just showing the code segment I used the header in.

 

[Vragabond]

Check FAQ:

http://www.tek-tips.com/faqs.cfm?fid=2999

specifically 1.4

 

[vlakas1981]

when using headers youould make sure that nothing else prints out to the screen before the header() function. check for echo() commands and errors.

 

[DRJ478]

Not only echo commands and error:
Any additional white space before the <? change of context is sent to the browser. So, you can't have the script you have embedded in a HTML page where you want the image to appear - that will not work.
If you want to do that you will have to write a small script which supplies the image data (excatly with the headers you have) as a separate request. The browser will fetch the image data by interpreting the 'src' attribute of the img tag.

# WRONG - won't work
<td>
<? 
header("Content-type: image/jpg");
imagejpeg($image);
....
# RIGHT
<td>
<img src="fetchimg.php?image=whatever>
</td>

# with a scriptfetchimg.php
<?
header("Content-type: image/jpg");
imagejpeg($_GET['image']);
?>