我有一个生成dataURI-png的svg文件,效果很好。我希望将dataURI保存为图像,因此我尝试通过ajax将dataURI发送到另一个可以执行PHP的服务器。但我无法让它发挥作用。
这是生成dataURI(有效)的代码
var mySVG = document.querySelector('svg'), // Inline SVG element
tgtImage = document.querySelector('.tgtImage'); // Where to draw the result
can = document.createElement('canvas'), // Not shown on page
ctx = can.getContext('2d'),
loader = new Image; // Not shown on page
console.log(mySVG);
loader.width = can.width = tgtImage.width;
loader.height = can.height = tgtImage.height;
loader.onload = function(){
ctx.drawImage( loader, 0, 0, loader.width, loader.height );
tgtImage.src = can.toDataURL("image/png");
};
这是将它发送到外部php-server的ajax代码:
$.ajax({
type: "POST",
data: {id:'testID',datauri: can.toDataURL("image/png")},
crossDomain: true,
//dataType: "jsonp",
url: "https://urltoscript.php",
success: function (data) {
console.log(data);
},
error: function (data) {
console.log(data);
}
});
生成png的PHP代码
$dataUrl = $_REQUEST['datauri'];
$id = $_REQUEST['id'];
list($meta, $content) = explode(',', $dataUrl);
$content = base64_decode($content);
file_put_contents('./tmp-png/'.$id.'.png', $content);
当手动插入dataURI时,PNG生成工作。但它不适用于上面的ajax函数。
谢谢!
答案 0 :(得分:0)
您可以使用canvas.toBlob()
,将图片作为php
发送到Blob
,使用php://input
阅读Blob
上的php
,参见{ {3}}
的javascript
if (!HTMLCanvasElement.prototype.toBlob) {
Object.defineProperty(HTMLCanvasElement.prototype, "toBlob", {
value: function (callback, type, quality) {
var binStr = atob( this.toDataURL(type, quality).split(",")[1] ),
len = binStr.length,
arr = new Uint8Array(len);
for (var i=0; i<len; i++ ) {
arr[i] = binStr.charCodeAt(i);
}
callback( new Blob( [arr], {type: type || "image/png"} ) );
}
});
}
can.toBlob(function(blob) {
var request = new XMLHttpRequest();
// to receive `echo`ed file from `php` as `Blob`
// request.responseType = "blob";
request.open("POST", "readBlobInput.php", true);
request.setRequestHeader("x-file-name", "filename");
request.onload = function() {
// `this.response` : `Blob` `echo`ed from `php`
// console.log(this.response)
console.log(this.responseText);
}
request.send(blob)
});
readBlobInput.php
<?php
// the Blob will be in the input stream, so we use php://input
$input = file_get_contents("php://input");
// choose a filename, use request header
$tmpFilename = $_SERVER["HTTP_X_FILE_NAME"];
// http://stackoverflow.com/q/541430/
$folder = __DIR__ . "/tmp-png";
// http://stackoverflow.com/q/17213403/
is_dir($folder) || @mkdir($folder) || die("Can't Create folder");
// put contents of file in folder
file_put_contents($folder . "/" . $tmpFilename, $input);
// get MIME type of file
$mime = mime_content_type($folder . "/" . $tmpFilename);
$type = explode("/", $mime);
// set MIME type at file
$filename = $tmpFilename . "." . $type[1];
// rename file including MIME type
rename($folder . "/" . $tmpFilename, $folder . "/" . $filename);
// to echo file
// header("Content-Type: " . $type);
// echo file_get_contents($newName);
echo $filename . " created";
?>
答案 1 :(得分:0)
$dataUrl = $_REQUEST['datauri'];
$id = $_REQUEST['id'];
list($meta, $content) = explode(',', $dataUrl);
$content = str_replace(".", "", $content); // some android browsers will return a data64 that may not be accurate without this without this.
$content = base64_decode($content);
$image = imagecreatefromstring($content);
imagepng($image, './tmp-png/'.$id.'.png', 90); // Third parameter is optional. Just placed it incase you want to save storage space...