如何在OCR认知中使用应用程序/八位位组流发送图像 [英] How to send image using application/octet-stream in OCR Cognitive

问题描述

你好，我正在尝试使用Microsoft的OCR API，它希望Content-type application/octet-stream和body发布一个二进制文件. 我尝试将图像发送为Base64(binary)，只是二进制，但是没有用. 有人知道该图像如何发送吗?

Hello I'm trying to use OCR API From Microsoft and It expect Content-type application/octet-stream and body post a binary. I tried send image as Base64(binary), just binary, however It didn't work. Someone knows how this image needs be sended?

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推荐答案

是的，您只需将其作为 Blob 或 File (几乎是一样的东西).

Yes, you can simply send it as a Blob or a File (which are almost the same things).

使用XMLHttpRequest API的示例代码:

Example code using the XMLHttpRequest API :

var xhr = new XMLHttpRequest();
xhr.onload = do_something_with_this_JSON;
xhr.open('POST', 'https://westus.api.cognitive.microsoft.com/vision/v1.0/ocr');
xhr.setRequestHeader("Content-Type", "application/octet-stream");
xhr.setRequestHeader("Ocp-Apim-Subscription-Key", YOUR_KEY);
xhr.send(blob);

现在介绍如何获取Blob，这实际上取决于您从何处获取图像.

Now on how to get a Blob, this really depends on where you get your image from.

• 如果它来自<input type="file">，则可以这样发送.
• 如果它来自请求_{(那么为什么不将URL作为application/JSON发送?)}，则可以请求响应为Blob(xhr.responseType = "blob"或fetch().then(resp => resp.blob())).
• 如果您有画布，则可以使用其此问题/答案.

• if it comes from an <input type="file">, then you can send it like that.
• if it comes from a request _{(then why don't you send the url as application/JSON?)} you can request the response to be a blob (xhr.responseType = "blob" or fetch().then(resp => resp.blob()).
• if you've got a canvas, then you can use its toBlob method.
• if you only have a dataURI, then check this Q/A.

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