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HTML5 ???? ??? ???? ???? ?? ??
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??? JavaScript ? PHP ??:
? ??? ?? PHP ???? ??? ??? ? HTML5 Canvas ???? ???? ??? ??????

??? ??? ? HTML5 Canvas ???? ???? ??? ??????

Dec 27, 2024 am 09:48 AM

Why Are My HTML5 Canvas Images Corrupted When Saving to the Server?

HTML5 ???? ??? ???? ???? ?? ??

??

??? ????? ?? ? HTML5 ???? ???? ????? ???. ???? ??? ????? ? ??? ?????. ??? ?? ? ? ????.

???

1. XMLHttpRequest? ???? ??????.

  • ?? ????? ?? ????? ?? ????? ??? ?? XMLHttpRequest ??? ???? ?????.
var xmlHttpReq = false;
if (window.XMLHttpRequest) {
  ajax = new XMLHttpRequest();
} else if (window.ActiveXObject) {
  ajax = new ActiveXObject("Microsoft.XMLHTTP");
}
  • ??? ?? application/x-www-form-urlencoded:
ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

2. PHP ???? ??:

  • substr($imageData, strpos($imageData, ","))? substr($imageData, strpos($imageData, ","))? ?? 1 .
  • ??? ?? ??? ???? ???? ???? ??? ?????. ??:
if ($fp) {
  fwrite($fp, $unencodedData);
  fclose($fp);
}

??? JavaScript ? PHP ??:

JavaScript

function saveImage() {
  var canvasData = canvas.toDataURL("image/png");
  var xmlHttpReq = false;

  if (window.XMLHttpRequest) {
    ajax = new XMLHttpRequest();
  } else if (window.ActiveXObject) {
    ajax = new ActiveXObject("Microsoft.XMLHTTP");
  }

  ajax.open("POST", "testSave.php", false);
  ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  ajax.onreadystatechange = function() {
    console.log(ajax.responseText);
  }
  ajax.send("imgData=" + canvasData);
}

PHP

<?php
if (isset($GLOBALS["HTTP_RAW_POST_DATA"])) {
  $imageData = $GLOBALS['HTTP_RAW_POST_DATA'];
  $filteredData = substr($imageData, strpos($imageData, ",")+1);
  $unencodedData = base64_decode($filteredData);

  if ($fp = fopen('/path/to/file.png', 'wb')) {
    fwrite($fp, $unencodedData);
    fclose($fp);
  }
}
?>

? ??? ??? ??? ? HTML5 Canvas ???? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

? ????? ??
? ?? ??? ????? ???? ??? ??????, ???? ?????? ????. ? ???? ?? ???? ?? ??? ?? ????. ???? ??? ???? ???? ??? ?? admin@php.cn?? ?????.

? AI ??

Undresser.AI Undress

Undresser.AI Undress

???? ?? ??? ??? ?? AI ?? ?

AI Clothes Remover

AI Clothes Remover

???? ?? ???? ??? AI ?????.

Video Face Swap

Video Face Swap

??? ??? AI ?? ?? ??? ???? ?? ???? ??? ?? ????!

???

??? ??

???++7.3.1

???++7.3.1

???? ?? ?? ?? ???

SublimeText3 ??? ??

SublimeText3 ??? ??

??? ??, ???? ?? ????.

???? 13.0.1 ???

???? 13.0.1 ???

??? PHP ?? ?? ??

???? CS6

???? CS6

??? ? ?? ??

SublimeText3 Mac ??

SublimeText3 Mac ??

? ??? ?? ?? ?????(SublimeText3)

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