javascript - Canvas images sent with data URI in request are corrupted after saving -
here javascript code:
function common_save_project() { var image = common_screenshot(); $.ajax ( { type: "post", processdata: false, url: site_url + "/system/xml/import/" + app_type + "/" + session_id + "/?prjid=" + project_id, data: "xml=" + common_order_xml + "&prodid=" + product_id + "&file=" + image.src } ).done(function( msg ) { alert("project saved. " + msg); }); } function common_screenshot() { var canvas = document.getelementbyid("save_image_canvas"); rasterizehtml.drawhtml(document.getelementbyid("mattes").innerhtml, canvas); var ctx = canvas.getcontext('2d'); ctx.drawimage(matte_canvas, 0, 0); var image = new image(); image.src = canvas.todataurl("image/jpeg"); return image; } here php code:
function xmlp_import_project ( $type, $sessid ) { // save jpg thumbnail file $jpg = xmlp_f_save_jpg( $_post['file'] ); } function xmlp_f_save_jpg( $jpgcontents ) { // random file name md5. $fid = md5(rand().rand()); $filename = $fid.'.jpg'; $tmpdir = files_dir_path."tmp/"; $destdir = files_dir_path."projects/"; $tmpfile = $tmpdir . $filename; $destfile = $destdir . $filename; // write temp file $fp = fopen($tmpfile, 'a'); fwrite($fp, base64_decode($jpgcontents)); fclose($fp); // make sure dest file unique while(is_file($destfile)){ $fid = md5(rand().rand()); $filename = $fid.'.jpg'; $destfile = $destdir . $filename; } db_query("insert {xmlp_files} ( fid, filename, filepath ) value ( '%s', '%s', '%s' )", $fid, $filename, $destdir); // copy file correct destination if(copy($tmpfile, $destfile)) return $fid; else{ drupal_set_message("xmlproject_func : image not found"); return false; } // delete tmp file unlink($tmpfile); } html:
<div id="mattes" style="width: 247.5px; height: 292.5px; left: 201.25px; top: 23.75px;"> <div id="opening_0" style="background-color: #bfbfbf; position: absolute; left: 45px; top: 45px; height: 202.5px; width: 157.5px; overflow: hidden; z-index: 6;" ondrop="drag_drop_drop(event, this)" ondragover="drag_drop_allow_drop(event)" onclick="photos_add_selected_fid(this);"> </div> <canvas id="matte_canvas" width="247" height="292" style="z-index: 3; position: relative; background-color: rgb(255, 255, 255);"> </canvas> </div> this image data:
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the php works fine when called flex program developed, moving away it. i'm not sure make work using javascript.
edit: found solution: http://www.php.net/manual/en/function.base64-decode.php#104193 $data = str_replace(' ','+',$data); produces image, middle of image black , don't know why.
because making image dataurl, need process image data on server have:
// write temp file $fp = fopen($tmpfile, 'a'); fwrite($fp, base64_decode($jpgcontents)); fclose($fp); should be:
$data = $jpgcontents; list($t, $data) = explode(';', $data); list(, $data) = explode(',', $data); $data = base64_decode($data); file_put_contents($tmpfile, $data); what we're doing taking out dataurl info:
data:[<mime-type>][;charset=<encoding>][;base64],<data> and keeping <data> part. can find out more at: http://en.wikipedia.org/wiki/data_uri_scheme
this how function should look:
function xmlp_f_save_jpg( $jpgcontents ) { // random file name md5. $fid = md5(rand().rand()); $filename = $fid.'.jpg'; $tmpdir = files_dir_path."tmp/"; $destdir = files_dir_path."projects/"; $tmpfile = $tmpdir . $filename; $destfile = $destdir . $filename; $data = $jpgcontents; list($t, $data) = explode(';', $data); list(, $data) = explode(',', $data); $data = base64_decode($data); file_put_contents($tmpfile, $data); // make sure dest file unique while(is_file($destfile)){ $fid = md5(rand().rand()); $filename = $fid.'.jpg'; $destfile = $destdir . $filename; } db_query("insert {xmlp_files} ( fid, filename, filepath ) value ( '%s', '%s', '%s' )", $fid, $filename, $destdir); // copy file correct destination if(copy($tmpfile, $destfile)) return $fid; else{ drupal_set_message("xmlproject_func : image not found"); return false; } // delete tmp file unlink($tmpfile); }
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