失败的crossOrigin访问画布toDataUrl [英] failed crossOrigin Access for canvas toDataUrl

问题描述

我想创建一个网页，人们可以创建万花筒。我使用可用的脚本，并添加了一些图像浏览和保存功能。现在我有一个奇怪的问题，将生成的画布数据保存为图像。

Firefox控制台说：
SecurityError：操作不安全

• 调用失败：Canvas2Image.saveAsPNG（oCanvas）;

这种情况甚至出现在我自己的网站的图片 - ???
我检查了一些tipps在这里发现在stackoverflow。他们都没有帮助。

• CORS没有解决问题。


• .htaccess条目无效：标题始终设置Access-Control-Allow-Origin *

另一个人似乎有同样的问题：如何允许跨源访问imgs和画布？

任何人都可以帮助我这个奇怪的事情？

非常感谢！

这里是测试网站： http://www.13lumen.de/kaleidoscopetest

解决方案

要完成CORS兼容性...

在客户端，您还必须设置Image对象的crossOrigin属性。

  var img = new Image（）; 
 img.crossOrigin =anonymous; 
 img.src =yourImage.png; 
  

所以你需要在canvas2Image.js中设置crossOrigin属性。

其他好的参考资料

在您的网站上：

http://enable-cors.org/

在您配置完网站后，使用此选项测试CORS兼容性：

http://client.cors-api.appspot.com/client#?client_method=GET&client_credentials=false&ser​​ver_url=http%3A%2F%2Fatlantacodingcompany.com%2Fimages% 2Fhouse1.jpg& server_enable = true& server_status = 200& server_credentials = false& server_tabs = remote

您可以使用dropbox.com测试您的网站。

• 注册一个免费的dropbox.com帐户。 >
  
• 暂时将您的图片放在public文件夹中。


• 右键点击任何公开图片并为该文件复制公开链接。


• 在客户端上：使用crossOrigin =匿名属性。


• 您的图片将暂时符合CORS标准！

I wanna create a litte page where people can create a kaleidoscope. I use an available script and added some image browse and Save-Funktionality. Now I have a weird problem with saving the resulting canvas data as an image.

Firefox console says: SecurityError: The operation is insecure

• failed for call: Canvas2Image.saveAsPNG(oCanvas);

And this occured even for pictures which come from my own site - whats that??? I checked out some tipps found here in stackoverflow. None of them could help.

• CORS doesnt fix the problem.
• .htaccess Entry had no effect: Header always set Access-Control-Allow-Origin *

Another guy seems to have same problem: How to allow cross-origin access to imgs and canvases?

Can anybody help me with this weird thing?

Thanks a lot!

Here is the test site: http://www.13lumen.de/kaleidoscopetest

解决方案

To complete CORS compatibility...

On the client-side you must also set the crossOrigin property of your Image object.

var img = new Image();
img.crossOrigin="anonymous";
img.src="yourImage.png";

So you will need to set the crossOrigin property in your canvas2Image.js also (about line 158).

Other good references

Here's a good link to enable cross-domain transfers on your site:

http://enable-cors.org/

And after you've configured your site, use this to test CORS compatibility:

http://client.cors-api.appspot.com/client#?client_method=GET&client_credentials=false&server_url=http%3A%2F%2Fatlantacodingcompany.com%2Fimages%2Fhouse1.jpg&server_enable=true&server_status=200&server_credentials=false&server_tabs=remote

Until you get your own site CORS compliant, you can use dropbox.com to test your site.

• Sign up for a free dropbox.com account.
• Temporarily put your images in the "public" folder.
• Right-click any public image and "copy public link" for that file.
• On the client: load your images using the crossOrigin="anonymous" property.
• Your images will temporarily be CORS compliant!

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