print BASE64 coded image into a FPDF document

Question

I\'ve some as base64 stored images in a database. Is it possible to print those data directly in a PDF document, using FPDF?

Data sctructure of the image

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Answer 1

Simply extend Fpdf (tested on 1.8.1) with this function:

protected function _parsepngdata($data) {
    $f = tmpfile();
    fwrite($f, base64_decode(substr($data, strpos($data,",")+1)));
    fseek($f, 0);
    $info = $this->_parsepngstream($f,"pngdata");
    fclose($f);
    return $info;
}

and use it this way: (provide base64 data instead of file name, and set type to "pngdata" instead of "png")

$pdf->Image("data:image/png;base64,iVBORw0KGgo...", $x, $y, $w, $h, "pngdata");

It will create a tempory file, write / read data to/from and delete it afterwards.

Answer 2

To ensure the images work with FPDF and to avoid errors, here is a modified version of @pedro-soares' code:

function getImage($dataURI){
  $img = explode(',',$dataURI,2);
  $pic = 'data://text/plain;base64,'.$img[1];
  $type = explode("/", explode(':', substr($dataURI, 0, strpos($dataURI, ';')))[1])[1]; // get the image type
  if ($type=="png"||$type=="jpeg"||$type=="gif") return array($pic, $type);
  return false;
}

Because FPDF only allows these three file types, it is important to check that it is valid. To use:

$pic = getImage($Base64StringGoesHere);
if ($pic!==false) $pdf->Image($pic[0], 10,30,0,0, $pic[1]);

Answer 3

Ok, I wasted half day making test with this issue. I have to tell that this solution is for print images from db row, directly, without stored them on temp files.

I´m going to write some points to consider:

• I´m using blob type on the DB to store human signature for print on pdf document
• I´m sending the signature to store to the db by post method, from a canvas node.
• When I print the string from the db blob, it´s come without the plus character "+" that don´t let me to print correctly the signature. To solve this issue, I make a "str_replace" to remove the blank spaces and insert the plus character.

Then the only thing that you have to do is:

$pdf->Image(str_replace(' ','+',$dbRow['blobImage']),160,150,20,10,'png');

If you need , like me, print several images from the db, you have to see if them come or not, because if the image come empty, you´ll have an error.

I just add this to the last code:

if( $dbRow['blobImage'] ){
                 $pdf->Image(str_replace(' ','+',$dbRow['blobImage']),160,150,20,10,'png');
            }

NOTE:

• 160 -> X position of the image
• 150 -> Y position of the image
• 20 -> X Scale of the image
• 10 -> Y Scale of the image
• 'png' -> The base format of my Base64 Image Type.

Answer 4

To add a bit more to Mari M answer, I just added few lines to work with any types of images. (as for me FPDF complains if the image is jpeg and I try to load tempimg.png)

$this->tempImgLoc = 'tempimg';    // Here I just remove the file extension
$dataPieces = explode(',',$dataURI);
$encodedImg = $dataPieces[1];
$decodedImg = base64_decode($encodedImg);

// extract the image type from data:image/png;base64
$extension = explode('/', $dataPieces[0]);
$extension = explode(';', $extension[1]);

$this->tempImgLoc .= '.' . $extension[0];

I am sure there is a better way to do that with regular expression, but to be honest, regexp is not my cup of tea...

Answer 5

New solution with imagecreatefromstring() Summer 2019

• delete temporary .png if exist
• create temporary .png file
• use $pdf->Image (fpdf)

My Api returns me a Datamatrix of 1234 as Byte Array. The folowing code shows you how to use that Byte Array as Png in Fpdf.

My $response = "iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAABJSURBVChTjYwBCgAgCAP9/6dNreVUgg7Gps3EUOfD5Q4Au6YdAGcH8ygyVKrFnhmbc9FL7qRxWRxEkXWW4Q691UsGpZPzt7dEFyY47RMW+x2LAAAAAElFTkSuQmCC"

$filename = '/lk_Reptool/printing/tmp/tmppng.png';

if (file_exists($filename)) {
    unlink($filename);
}
$response = file_get_contents('https://myapi.com/TwoDCode/GetDatamatrixAsPngByteArray?datamatrixText=' . $RepID . '&pixelSize=100');
$response = base64_decode($response);
$img = imagecreatefromstring($response);
imagepng($img, $filename);

code for pdf

$pdf = new PDF('P', 'mm', 'A4');
$pdf->AddPage();
$pdf->Image('/lk_Reptool/printing/tmp/tmppng.png', 180, 20, 10, 10);

Answer 6

I'know this is an old topic, but there is a easier way of solving this problem. Just try this simple steps:

1. Strip data:image/png;base64 from URI using explode
2. Concatenate data://text/plain;base64, with what is left from the stripped URI
3. Use the result string(base64) as argument of FPDF Image()

Example:

$dataURI= "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAPCAMAAADarb8dAAAABlBMVEUAAADtHCTeKUOwAAAAF0lEQVR4AWOgAWBE4zISkMbDZQRyaQkABl4ADHmgWUYAAAAASUVORK5CYII=";

$img = explode(',',$logo,2);
$pic = 'data://text/plain;base64,'. $img;

$pdf = new FPDF();
$pdf->AddPage();
$pdf->Image($pic, 10,30,0,0,'png');
$pdf->Output();

Remember of choose the correct image type on Image() function.