如何在FPDF中显示JSON / base64编码图像？ [英] How to display a JSON/base64 encoded image in FPDF?
问题描述
我正在存储签名（在我的数据库中使用签名板 Coldfusion / MySQL 5.0.88 并且想要输出我正在使用 fpdf 生成的pdf的签名。但是我不能让它工作......
I'm storing signatures (using signaturepad in my database Coldfusion/MySQL 5.0.88 and would like to output the signature I'm taking onto a pdf which I'm generating with fpdf. However I can*t get it to work...
签名存储如下：
[{"lx":19,"ly":58,"mx":19,"my":57},{"lx":23,"ly":54,"mx":19,"my":58},{"lx":26,"ly":53,"mx":23,"my":54},{"lx":32,"ly":51,"mx":26,"my":53},{"lx":38,"ly":47,"mx":32,"my":51},{"lx":44,"ly":44,"mx":38,"my":47},{"lx":51,"ly":41,"mx":44,"my":44},{"lx":58,"ly":37,"mx":51,"my":41},{"lx":64,"ly":35,"mx":58,"my":37},{"lx":67,"ly":31,"mx":64,"my":35},{"lx":70,"ly":30,"mx":67,"my":31},{"lx":72,"ly":28,"mx":70,"my":30},{"lx":71,"ly":28,"mx":72,"my":28},{"lx":69,"ly":28,"mx":71,"my":28},{"lx":66,"ly":28,"mx":69,"my":28},{"lx":62,"ly":29,"mx":66,"my":28},{"lx":59,"ly":31,"mx":62,"my":29},{"lx":55,"ly":32,"mx":59,"my":31},{"lx":52,"ly":33,"mx":55,"my":32},{"lx":48,"ly":35,"mx":52,"my":33},{"lx":44,"ly":37,"mx":48,"my":35},{"lx":41,"ly":38,"mx":44,"my":37},{"lx":39,"ly":40,"mx":41,"my":38},{"lx":36,"ly":40,"mx":39,"my":40},{"lx":33,"ly":42,"mx":36,"my":40},{"lx":32,"ly":43,"mx":33,"my":42},{"lx":31,"ly":44,"mx":32,"my":43},{"lx":31,"ly":46,"mx":31,"my":44},{"lx":32,"ly":48,"mx":31,"my":46},{"lx":136,"ly":23,"mx":32,"my":48},{"lx":132,"ly":24,"mx":136,"my":23},{"lx":104,"ly":38,"mx":132,"my":24},{"lx":103,"ly":40,"mx":104,"my":38},{"lx":102,"ly":41,"mx":103,"my":40},{"lx":102,"ly":42,"mx":102,"my":41},{"lx":103,"ly":42,"mx":102,"my":42},{"lx":108,"ly":42,"mx":103,"my":42},{"lx":115,"ly":42,"mx":108,"my":42},{"lx":123,"ly":39,"mx":115,"my":42},{"lx":133,"ly":36,"mx":123,"my":39},{"lx":141,"ly":34,"mx":133,"my":36},{"lx":148,"ly":32,"mx":141,"my":34},{"lx":155,"ly":30,"mx":148,"my":32},{"lx":159,"ly":29,"mx":155,"my":30},{"lx":161,"ly":28,"mx":159,"my":29},{"lx":159,"ly":27,"mx":161,"my":28},{"lx":155,"ly":27,"mx":159,"my":27},{"lx":151,"ly":27,"mx":155,"my":27},{"lx":145,"ly":27,"mx":151,"my":27},{"lx":140,"ly":29,"mx":145,"my":27},{"lx":135,"ly":31,"mx":140,"my":29},{"lx":132,"ly":33,"mx":135,"my":31},{"lx":127,"ly":36,"mx":132,"my":33},{"lx":125,"ly":38,"mx":127,"my":36},{"lx":125,"ly":40,"mx":125,"my":38},{"lx":125,"ly":41,"mx":125,"my":40},{"lx":125,"ly":42,"mx":125,"my":41},{"lx":127,"ly":43,"mx":125,"my":42},{"lx":131,"ly":44,"mx":127,"my":43},{"lx":139,"ly":45,"mx":131,"my":44},{"lx":147,"ly":45,"mx":139,"my":45},{"lx":157,"ly":43,"mx":147,"my":45},{"lx":164,"ly":41,"mx":157,"my":43},{"lx":173,"ly":39,"mx":164,"my":41},{"lx":181,"ly":36,"mx":173,"my":39},{"lx":186,"ly":34,"mx":181,"my":36},{"lx":191,"ly":33,"mx":186,"my":34},{"lx":193,"ly":30,"mx":191,"my":33},{"lx":194,"ly":29,"mx":193,"my":30},{"lx":194,"ly":28,"mx":194,"my":29},{"lx":193,"ly":27,"mx":194,"my":28},{"lx":191,"ly":26,"mx":193,"my":27},{"lx":188,"ly":25,"mx":191,"my":26},{"lx":183,"ly":25,"mx":188,"my":25},{"lx":180,"ly":25,"mx":183,"my":25},{"lx":177,"ly":25,"mx":180,"my":25},{"lx":174,"ly":27,"mx":177,"my":25},{"lx":171,"ly":30,"mx":174,"my":27},{"lx":169,"ly":32,"mx":171,"my":30},{"lx":168,"ly":34,"mx":169,"my":32},{"lx":167,"ly":36,"mx":168,"my":34},{"lx":167,"ly":38,"mx":167,"my":36},{"lx":168,"ly":40,"mx":167,"my":38},{"lx":169,"ly":41,"mx":168,"my":40},{"lx":171,"ly":41,"mx":169,"my":41},{"lx":174,"ly":41,"mx":171,"my":41},{"lx":176,"ly":41,"mx":174,"my":41},{"lx":176,"ly":40,"mx":176,"my":41},{"lx":177,"ly":39,"mx":176,"my":40},{"lx":177,"ly":37,"mx":177,"my":39}]
siganturepad中包含一个自定义函数（图像签名）以将上述内容转换回来成为一个图像。像这样：
There is a custom function included in siganturepad (signature to image) to convert the above back into an image. Like so:
<?php
require_once '../../signature-to-image.php';
$img = sigJsonToImage(file_get_contents('sig-output.json'));
// Output to browser
header('Content-Type: image/png');
imagepng($img);
imagedestroy($img);
>
但如果我在我的fpdf页面上尝试这个，整个页面都会中断（我猜是因为我想要将图像嵌入到单元格中而不是仅将图像输出到浏览器中，我得到了这个：
But if I try this on my fpdf page, the whole page breaks ( I guess because I want to embed the image in a cell not output only the image to the browser) and I get this:
资源ID＃10‰PNGIHDRÆ7Ø7¢¶±IDATxœí> iP [× C / 'A6±£' ŒÀk0> EY†6）NÒƉݸμM2î'nf：d2gqÆušq-IO！ ŽSâÄNJgRÛñ'@ 1KOFf±õ'ÀfÖÖ/}y'Ä`çþ>x¬û®Gºÿ{Î=ç...¹.Pm'Ük@ IA（JB1PRŠ'，Pb¤％¡（）Å@ IA（JB1PRŠ'，Pb¤％¡（）Å@ IA（JB1PRŠ'，Pc'ÀðèT³ÆPa×L'^z02œ¾ÐÔ£·Œ+ÔX
Resource id #10‰PNG IHDRÆ7Ø7¢¶±IDATxœí›iP[×Ç/’a6±£'ŒÀk0›ë݆6)NÒƉݸµM2î´nf:"d2gq"Æušq–Ió! ŽSâÄNJgRÛñ ’@1KOFf±õ´ ÀfÖÖ/}y‘Ä`çþ>x¬û®Gºÿ{Î=ç…¹.Pm¡ €Ük@IA(J B1PRŠ’‚P"„b ¤ %¡()Å@IA(J B1PRŠ’‚P"„b ¤ %¡()Å@IA(J B1PRŠ’‚Pc¡ €üÀðèT³Æ Pa×L'^z02œ¾Ð"Ô£·Œ+ÔX‹S¨0íÍb¼«wpåòô4,h ¤vK†ê¿Õe¨þÆà1Á óÓ¥bŽTÌÉËN™ÃL#u ªƒÇ•¾§Y‘±27½ZÂg%{^ ƒ? œNÚoQ¨°A†ê‡Fnâ–Dìyà¾=÷ß¹ >¿¤ýËáÆ[Óþ¿¥€—ºwKá/Ëy4Z1%*lvG{¹YmÀãÚØ"mÆiþ‹i|êN}c÷7}ß´öûiÃoÖ×dº-¹'"VÛSïž?)ïTKxÏ?.‰aFø˜ßÞcúJ¡;¥¼>:y°±ˆ{è÷kÙ‰1øÕ»XR£"wZÔ˜Å"Z÷Z£ÛUuíîäø¨y6iÒjSjJA†êÛºMV›ƒ¸ÄCX"Äîp6u}ìüS‡Î\× ªo잰άKß¼³wãk>lÞvàk9Š±¢#_ß³vKEŽŸ·¶9ŽžS½Qßj™xò+^Ýý3|ü®""idâí/ÛjOw:œ^fkɳ[KçÁ˜‘qk‹ÚЬ6ÈP}WŸÅîpâãaa@ÌM–ˆ2[*æho¿ö™RŽbÀo1án©®AõÝõA|„‡...
如果我这样做：
if( strlen($unterschrift) > 0){
$img = sigJsonToImage( $unterschrift );
};
并尝试输出：
if ( $imgProceed == "true" ){
$pdf->imagepng($img);
} else {
$pdf->Cell(50,4,'',0,1);
}
所有我得到的是：
`Call to undefined method PDF::imagepng() `/ `strpos() expects parameter 1 to be string, resource`
有人可以向我解释，我做错了什么或者我需要做什么才能将图像包含在fpdf的单元格中？我很无能为力。
Can someone explain to me, what I'm doing wrong or what I need to do to include the image in a cell in fpdf? I'm clueless.
谢谢！
推荐答案
问题在这里
$pdf->imagepng($img);
^-------------- This should be an image path (String)
解决方案
$file = 'signature.png' ;
imagepng($img, $file);
^----------- Save Image to File Instead
那么
if ($imgProceed == "true") {
$pdf->imagepng($file);
} else {
$pdf->Cell(50, 4, '', 0, 1);
}
这篇关于如何在FPDF中显示JSON / base64编码图像？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
