I've got a variable that gets the pdf as a binary file into the website
<?=$calculationData->PDF_file?>
How do I show the pdf as a link, instead of binary text?
Note: I'm a newbie at this and don't know a lot about php! :-)
I assume $calculationData is an object from a database and the PDF content is stored there as binary data. Then you can do something like this:
Link to a PHP file that loads the content and sends it to the browser.
<a href="show_pdf.php?id=555">
Where id is the id of your calculationData somewhere in the database in this example. You need something to identify it.
show_pdf.php:
<?php
/* load your calculation data here ... */
header("Content-type: application/pdf");
header("Content-Disposition: attachment;filename='mywhateverfile.pdf'");
echo $calculationData->PDF_file;
exit();
In that way you can send the binary data to the browser and telling it with the correct headers, what to do with that data.
Related
Hi I have searched the web for 2 days but did not accomplish what I am looking for.
I have an apache server which will be accessed by 146 students. the user picks an angle from dropdown lets say 45 degress, then user clicks CALCULATE button. Then user clicks DIAGRAM button to see how the sine graph looks like.
Works like charm when i write the image to a file e.g: imagepng($img,"diagram.png");
Now the problem is that the diagram.png will always get overwritten by the last user. So for example if another user logs in and calculates the Sin 135. Both users will see Sine 135 because filename is hardcoded since there is conflict of filename.
I have searched the web on how to create the image dynamically instead of writing to a file and then reading the file. I have come across the following but not working:
base64_encode and decode
What would I have to do to my code of imagepng(...., ...) mentioned above to make use of base64 so I can actually draw the picture of already processed data. Let assume if I comment out the imagepng(..) code, then what do I replace it with. I hope I don't have to change my code a whole lot.
Please help
thanks
Amit
The filename argument to imagepng is optional. From the manual:
filename
The path to save the file to. If not set or NULL, the raw image stream will be outputted directly.
You would just need to send a png header at the top of the script and you would get the image as output for that script.
It's hard to tell without seeing you code how it is structured
but if once the user submits the form all you do is show the image by itself, then you can do something like this.
// make sure nothing else is out put before this otherwise it will stuff up the header
header('Content-Type: image/png);
imagepng($img);
If you embed the image into an html page as the result, then your best best would be to change the url of the image on the success page to something like this.
<img src="/path/to/file.php?deg=45" />
Then in the file.php
$deg = $_GET['deg'] + 0; // make sure it is a number
$img= function_render_graph($deg);
// make sure nothing else is out put before this otherwise it will stuff up the header
header('Content-Type: image/png);
imagepng($img);
By using a GET request, rather then a POST request then the image will likely be cached by the browser, so it doesn't need to be rendered each time. (Given that you have a drop list of angles, there must be a limited number of graphs that can actually be drawn)
Draw_Resultant_Prism_Graph (parameters)
{
$img = imagecreatetruecolor(800,750);
....
....
...
the following lines captures the data from output buffer and displays on same screen
***some version of IE have some issues mostly the dumb terminals where IE update is ADMIN
***restricted
ob_start();
header("Content-type: image/jpeg");
imagepng($img);
$output = ob_get_contents();
ob_end_clean();
imagedestroy($img);
echo img src="data:image/jpeg;base64,'.base64_encode($output).'"
user tags around img above and semicolon af
}
How do I generate a pdf-file from a binary file retrieved from database in php5? It comes base64 encoded, and I just decoded it, but don't know what to do next...
The binary data is simply the actual file, or rather the important contents of that file, just without file name.
$base64 = /* some base64 encoded data fetched from somewhere */;
$binary = base64_decode($base64);
And there you have the file data/contents of the file in the $binary variable. From here, it depends on what you want to do. You can write the data to a file, and you get an "actual" PDF file:
file_put_contents('my.pdf', $binary);
You can spit the data out to the browser with an appropriate header, and the user will receive something that looks like a PDF file to him:
header('Content-type: application/pdf');
header('Content-Disposition: attachment; filename="my.pdf"');
echo $binary;
I'm repeating your last sentence .:) I dont know what is the question! :). If you want to pus the file to a browser, you can set the headers and stream the decoded content. Or if you want the file as is, write on to file system and use it. Please be more clear on your question!
Thanks!!
I have a list of data compiled from a mysql recordset when I click a button on one of my pages. The data is stored in a variable $list.
It's a site activity log, and the button is a backup button.
Is there any way that I could make it open a SAVE AS dialogue box so I can save that data to a text file on my local comp?
when you click your "back up" button, you should get the user to a new script: this script should take the $list variable from the DB again and format it into a text file, then in order to make it available to the user's browser as a downloadable file, you should use headers (look at http://php.net/manual/en/function.header.php) like this:
<?php
// We'll be outputting a PDF
header('Content-type: application/pdf');
// It will be called downloaded.pdf
header('Content-Disposition: attachment; filename="downloaded.pdf"');
// The PDF source is in original.pdf
readfile('original.pdf');
?>
In this case this is a pdf file (example is from the above link). Changing the content-type to the proper mime-type ("Content-Type: text/plain" for example) and setting the right file name, all that you echo will be sent to the browser as an attached file.
If any question, ask :)
after generate that file just set the physical path of that file and throw header so it will be download at your local system
Cheers
Ok, I'm hoping I can explain my situation rather than pasting lines and lines of code.
Currently, JSON sends positional info to my PHP file which in turn uses this data to generate an image, saves it and returns the filename via JSON back to browser. Javascript then refreshes the image on screen.
This all works fine at the moment, but I am wanting to optimise the process and look at the possibility of outputting the image file straight after it's created then save afterwards.
My ideal solution would be something like:
header('Content-Type: image/gif');
echo $this->canvas;
// Save user file
$this->canvas->writeImage( $this->userFile = 'user_img.gif' );
$this->canvas->destroy();
// encode everything and send to browser
echo json_encode(array('misc data back to the browser'));
(I still need to send data back to browser via JSON)
And in my HTML I would have the image laid out like this:
<img src='json-processing-script.php' />
But as usual nothing is ever that simple, so I'd like to hear if anyone can make any pointers.
In your example, the json would be added to the gif, messing up your image. If you want to return these two completely different things from your php script, you would have to encode the image, add it to the json and extract it in the javascript to get the source of your image.
See for example this question.
I want code that loads an image to a PHP server and then send it to browser.
For example I want sample.php to send an image to browser once it is requested.
in other words, I want to create a PHP file that acts like a proxy for an image.
why are you doing this?
why don't deliver the image directly?
if you are trying to display a random image you may as well just redirect to the image using
header("Location: address-of-image");
for delivering the file to your clients from your server and not from its original location you can just do. however your php.ini settings need to allow external file opens
readfile("http://www.example.com/image.jpg")
correct headers are not required if you are going to display the image in an img tag,
altough i would recommend it. you should check the filetype of the image or in most cases just set an octet-stream header so the browser doesnt assume an incorrect type like text or something and tries to display binary data.
to do so just do
header("Content-type: application/octet-stream")
one more thing to consider may be setting correct headers for caching...
You need to use
$image = fopen("image.png");
Modify the headers(not sure exacly if it's correct)
headers("Content-type: image/png");
And then send the image
echo fread($image, file_size("image.png"));