如何通过.ajax发布以base64编码的图像? [英] How to post an image in base64 encoding via .ajax?

问题描述

我有一些JavaScript代码可将图像上传到服务器.下面是可以正常工作的ajax调用.

I have some javascript code that uploads an image to a server. Below is the ajax call that works correctly.

$.ajax({
    url: 'https://api.projectoxford.ai/vision/v1/analyses?',
    type: 'POST',
    contentType: 'application/json',
    data: '{ "Url": "http://images.takungpao.com/2012/1115/20121115073901672.jpg" }',
})

我现在需要将图片上传为base64编码，例如

I now need to upload the image a a base64 encoding e.g.

data: 'data:image/jpeg;base64,/9j/4AAQSkZJRgA..........gAooooAKKKKACiiigD//Z'

但这是行不通的，即服务器无法识别我发送和抱怨的数据.

But that doesn't work, i.e. the server doesn't recognise the data I send and complains.

有人知道在AJAX调用中发送base64编码数据的正确格式是什么吗?

Does anyone know what the correct format is for sending base64 encoded data in the AJAX call ?

推荐答案

感谢所有有助于我前进的答案.

Thanks for all the answers which helped me along.

我也已将问题发布到

I had also posted the question to the forums on https://social.msdn.microsoft.com/Forums/en-US/807ee18d-45e5-410b-a339-c8dcb3bfa25b/testing-project-oxford-ocr-how-to-use-a-local-file-in-base64-for-example?forum=mlapi (more Project Oxford specific) and between their answers and your's I've got a solution.

1. 您需要发送一个Blob
2. 您需要在.ajax调用中设置processData:false和contentType: 'application/octet-stream'选项

1. You need to send a Blob
2. You need to set the processData:false and contentType: 'application/octet-stream' options in the .ajax call

所以我的解决方案看起来像这样

So my solution looks like this

第一个创建blob的函数(从比我更有天赋的人逐字复制)

First a function to make the blob (This is copied verbatim from someone more gifted than I)

makeblob = function (dataURL) {
            var BASE64_MARKER = ';base64,';
            if (dataURL.indexOf(BASE64_MARKER) == -1) {
                var parts = dataURL.split(',');
                var contentType = parts[0].split(':')[1];
                var raw = decodeURIComponent(parts[1]);
                return new Blob([raw], { type: contentType });
            }
            var parts = dataURL.split(BASE64_MARKER);
            var contentType = parts[0].split(':')[1];
            var raw = window.atob(parts[1]);
            var rawLength = raw.length;

            var uInt8Array = new Uint8Array(rawLength);

            for (var i = 0; i < rawLength; ++i) {
                uInt8Array[i] = raw.charCodeAt(i);
            }

            return new Blob([uInt8Array], { type: contentType });
        }

然后

$.ajax({
    url: 'https://api.projectoxford.ai/vision/v1/ocr?' + $.param(params),
    type: 'POST',
    processData: false,
    contentType: 'application/octet-stream',
    data: makeblob('data:image/jpeg;base64,9j/4AAQSkZJRgA..........gAooooAKKKKACiiigD//Z'
 })
.done(function(data) {alert("success");})
.fail(function() {alert("error");});

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