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php - 使用 codeigniter 上传 Canvas 图像

转载 作者:行者123 更新时间:2023-12-05 07:41:01 26 4
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我尝试使用 codeigniter 上传 Canvas 图像,我有这个 Ajax 代码

$.ajax({
url: '/gifs/savepreview',
type: 'POST',
beforeSend: function (xhr) {
xhr.setRequestHeader('Content-type','application/x-www-form-urlencoded');
},
data: 'imgdata=' + canvas.toDataURL('image/gif'),
success: function () { },
error: function () { },
});

这是保存帖子数据的代码

$imgdata = $this->security->xss_clean($this->input->post('imgdata'));

$temp_file_path = tempnam(sys_get_temp_dir(), 'tempimage');
$img = str_replace('data:image/png;base64,', '', $imgdata);
$img = str_replace('[removed]', '', $img);
$img = str_replace(' ', '+', $img);
file_put_contents($temp_file_path, base64_decode($img));
$image_info = getimagesize($temp_file_path);
$_FILES['userfile'] = array(
'name' => uniqid().'.'. str_replace("image/", '', $image_info['mime']),
'type' => $image_info['mime'],
'tmp_name' => $temp_file_path,
'error' => UPLOAD_ERR_OK,
'size' => filesize($temp_file_path),
);

$config['upload_path'] = 'assets/uploads/';
$config['remove_spaces'] = TRUE;
$config['allowed_types'] = "*";
$config['max_size'] = "2048000";
$config['overwrite'] = TRUE;
$config['file_name'] = "canvas-image";
$this->load->library('upload', $config);
$this->upload->initialize($config);
if ($this->upload->do_upload('userfile')){
return "success";
}else{;
echo $this->upload->display_errors();
}

请帮我修复或找到其他上传 Canvas 图像的方法。

最佳答案

看看这对你有用吗?

<canvas id="cnvs"></canvas>
<button id="upld"></button>
$(document).on('click', '#upld', function () {
var form_data = new FormData();
var file;
file = $('#cnvs')[0].toDataURL('image/png');
file = file.replace(/^data:image\/(png|jpg|jpeg);base64,/, '');
form_data.append('photo', file);
$.ajax({
url: 'mycontroller/myfunc',
type: 'POST',
dataType: 'JSON',
data: form_data,
processData: false,
contentType: false,
async: false,
cache: false,
beforeSend: function () {
...
},
success: function (data) {
...
},
error: function (xhr, ajaxOptions, thrownError) {
...
}
});
});

PHP

$imgData = base64_decode($this->input->post('photo', TRUE));

/* calculate the approximate file size */
$fileSize = (int) (strlen(trim($imgData, '=')));

if ($fileSize > /* any value */) {
/* show error message for big files */
}

$path = 'assets/uploads/file.png'; /* my path and file name with extension */
if (file_exists($path)) {
unlink($path);
}
/* create image */
file_put_contents($path, $imgData);

关于php - 使用 codeigniter 上传 Canvas 图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45690488/

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