Question

我正在存储签名（在我的数据库Coldfusion/MySQL 5.0.88中使用signaturepad，并希望输出我正在使用fpdf生成的pdf的签名。但是我无法让它工作......

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（signature to image）中包含一个自定义函数，可将上面的内容转换回图像。像这样：

<?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);
>

但是如果我在我的fpdf页面上尝试这个，整个页面都会中断（我想是因为我想将图像嵌入到一个单元格中，而不是只将图像输出到浏览器中）而且我得到了这个：

资源ID＃10‰PNGIHDRÆ7Ø7¢¶±IDATxœí> iP [×Ç/'a6±£'ŒÀk0>ëÝ†6）NÒÆ‰μμM2î'nf：“d2gq”Æušq-Ió！ ŽSâÄNJgRÛñ'@ 1KOFf±õ'ÀfÖÖ/}y'Ä`çþ＆gt;x¬û®Gºÿ{Î=ç...¹.Pm'Ük@ IA（JB1PRŠ'，P“”b¤％¡（）Å@ IA（JB1PRŠ'，P“”b¤％¡（）Å@ IA（JB1PRŠ'，Pc'ÀðèT³ÆPa×L'^z02œ¾Ð“Ô£Œ+ÔX

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`

有人可以向我解释一下，我做错了什么或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。

谢谢！

Answer 1

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

然后

if ($imgProceed == "true") {
    $pdf->imagepng($file);
} else {
    $pdf->Cell(50, 4, '', 0, 1);
}

Answer 2

最初，我打算转换为PNG，我想的越多，它就越需要开销。毕竟，Signature Pad为我们提供了在FPDF中重新绘制签名所需的一切。

我做了以下事情：

  // decode the signature into an array
    $sig = json_decode($signatureInJSON);

    // for each line segment
    foreach ($sig as $line) {
        $lx = $line->lx;
        $ly = $line->ly;
        $mx = $line->mx;
        $my = $line->my;
        // draw the line
        $pdf->Line($lx, $ly, $mx, $my);
    }

显然，我还添加了一些函数来缩放签名并将其偏移到我想要的PDF格式。

希望能帮助别人。

如何在FPDF中显示JSON / base64编码图像？

2 个答案: