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Imagecreatefrompng() function in php

  1. May 28, 2007 #1

    Math Is Hard

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    I was experimenting with the imagecreatefrompng() function in php. There was an example here:
    http://us2.php.net/imagecreatefrompng

    I tried to modify it to use an image called full.png in my img folder.

    aaaimage.php
    Code (Text):


    #!/usr/local/bin/php
    <?php

    function LoadPNG($imgname)
    {
        $im = @imagecreatefrompng($imgname); /* Attempt to open */
        if (!$im) { /* See if it failed */
            $im  = imagecreatetruecolor(150, 30); /* Create a blank image */
            $bgc = imagecolorallocate($im, 255, 255, 255);
            $tc  = imagecolorallocate($im, 0, 0, 0);
            imagefilledrectangle($im, 0, 0, 150, 30, $bgc);
            /* Output an errmsg */
            imagestring($im, 1, 5, 5, "Error loading $imgname", $tc);
        }
        return $im;
    }
    header("Content-Type: image/png");
    $img = LoadPNG("img/full.png");
    imagepng($img);

    ?>
     
    I'm not sure what to do with the HTML. I tried the simplest idea:
    display.htm
    Code (Text):

    <HTML>
    <HEAD></HEAD>
    <BODY>
    This is a test.<BR/>
    <img src="aaaimage.php" />
    </BODY>
    </HTML>
     
    But that does nothing. I just get a broken image tag. I am not really clear on what the function returns, they say it is an

    "image identifier" but I don't know what that means.

    Any advice? Thanks.:smile:
     
  2. jcsd
  3. May 28, 2007 #2

    NoTime

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    Here is a lot of commentary on this function.
    Apparently there is only one error return.
    Scroll down a bit. The page looks blank, but isn't.

    http://us.php.net/imagecreatefrompng
     
  4. May 29, 2007 #3

    Math Is Hard

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    thanks. I've been through the commentary but still haven't solved my problem. I think I might try the jpeg version of this function and see if I have any more luck. I was hoping if I was doing something stupid in my code it would be glaringly apparent and I could correct it, but it sounds like this is just going to be a complicated function to work with.
     
    Last edited: May 29, 2007
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