如何使用Django发布和检索blob [英] How to post and retrieve blob with Django

问题描述

我有一个 blob 。这是一个使用< canvas> 调整大小的图像。我已经通过将数据转换为网址来验证数据是否正确，以便根据 MDN指南。到现在为止还挺好。现在，我想把它发布到我的Django服务器（以及一些其他的输入）。

I have a blob. It's an image that I resized using a <canvas>. I've verified that the data is correct by converting it to a url to test it as per the MDN guide. So far so good. Now, I'd like to post it to my Django server (along with some other inputs).

所以我这样做：

var fd = new FormData(form);
canvas.toBlob( function(blob) {
  fd.set("image0", blob, "image0.jpg");
}, "image/jpeg", 0.7);
var xhr = new XMLHttpRequest();
xhr.open('POST', '/ajax-upload/', true);
xhr.setRequestHeader("X-CSRFToken", csrftoken);
xhr.send(fd);

我使用网络检查器控制台检查POST消息。我的blob被确认为与POST请求一起发送，我可以看到发送的二进制数据为image0字段。

I inspect the POST message with the network inspector console. My blob is confirmed as sent with the POST request and I can see the binary data send as the "image0" field.

-----------------------------1773139883502878911993383390
Content-Disposition: form-data; name="image0"; filename="blob"
Content-Type: image/png

所以我处理POST请求与此视图，可访问url / ajax-upload / ：

So I handle the POST request with this view, accessible at url /ajax-upload/:

def ajax_upload(request):
    if request.method == 'POST':
        print(request.POST.urlencode())

这给我什么。一旦我找到我的blob去哪里，我该怎么把它变成一个图像？像 img = Image.open（request.POST [image0]）？

This gives me nothing. Once I find out where my blob went, how can I turn it into an Image? Something like img = Image.open(request.POST["image0"])?

推荐答案

一个blob是二进制数据，所以你可以在Django的 request.body 中找到它。它的字节编码（而不是Unicode）。

A blob is binary data, so you can find it in the request.body in Django. Its Bytes encoded (not Unicode).

HttpRequest.body
原始HTTP请求体作为字节串。这对于处理数据的方式不同于传统的HTML格式：二进制图像，XML有效载荷等。

HttpRequest.body The raw HTTP request body as a byte string. This is useful for processing data in different ways than conventional HTML forms: binary images, XML payload etc.

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