RealityCapture API：无法启动处理

Question

我正在阅读 Autodesk forge 提供的关于 [RealityCapture API][1] 的教程。

我想开发一个应用程序，将我手机拍摄的照片发送到 Autodesk forge 服务器，并获得一个 3D 模型。

但是我被困在处理的初始化阶段。 我的浏览器窗口出现以下错误消息：

At least three images are required to process the Photoscene

在我的 Node.js 命令上提示以下错误：

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at ServerResponse.setHeader (_http_outgoing.js:561:11)
    at ServerResponse.header (C:\git\recap-walkthrough-photo.to.3d\node_modules\express\lib\response.js:771:10)
    at ServerResponse.send (C:\git\recap-walkthrough-photo.to.3d\node_modules\express\lib\response.js:170:12)
    at C:\git\recap-walkthrough-photo.to.3d\start.js:171:17
    at processTicksAndRejections (internal/process/task_queues.js:95:5) {
  code: 'ERR_HTTP_HEADERS_SENT'
}
(node:45332) UnhandledPromiseRejectionWarning: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at ServerResponse.setHeader (_http_outgoing.js:561:11)
    at ServerResponse.header (C:\git\recap-walkthrough-photo.to.3d\node_modules\express\lib\response.js:771:10)
    at ServerResponse.send (C:\git\recap-walkthrough-photo.to.3d\node_modules\express\lib\response.js:170:12)
    at C:\git\recap-walkthrough-photo.to.3d\start.js:176:17
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:45332) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:45332) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

我只修改了源代码中的文件[]路径和“内容类型”：

// Route /api/forge/recap/photoscene/upload
// Adds one or more files to a photoscene.
app.get('/api/forge/recap/photoscene/upload', function (req, res) {
    var photosceneId = req.query.photosceneid;
    Axios({
        method: 'POST',
        url: 'https://developer.api.autodesk.com/photo-to-3d/v1/file',
        headers: {
            'content-type': 'multipart/form-data',
            'Authorization': 'Bearer ' + access_token
        },
        data: querystring.stringify({
            photosceneid: photosceneId,
            type: 'image',
            'file[0]': 'C:\Dataset\FlowerPot\20210527_082430.jpg',
            'file[1]': 'C:\Dataset\FlowerPot\20210527_082459.jpg',
            'file[2]': 'C:\Dataset\FlowerPot\20210527_082513.jpg',
            'file[3]': 'C:\Dataset\FlowerPot\20210527_082525.jpg',
            'file[4]': 'C:\Dataset\FlowerPot\20210527_082832.jpg',
            'file[5]': 'C:\Dataset\FlowerPot\20210527_082937.jpg',
            'file[6]': 'C:\Dataset\FlowerPot\20210527_082944.jpg'
        })
    })
        .then(function (response) {
            // Success
            console.log(response);
            if (response.data.Error) {
                res.send(response.data.Error.msg);
            }
            console.log(JSON.stringify(response.data.Files));
            var nextLink = '/api/forge/recap/photoscene/process?photosceneid=' + photosceneId;
            res.send('<p>Files added to photoscene!</p><a href="' + nextLink + '">Begin processing photoscene</a>');
        })
        .catch(function (error) {
            // Failed
            console.log(error);
            res.send('Failed to upload files to photoscene');
        });
});

如何验证我的图片是否已成功上传？
[1]：https://forge.autodesk.com/developer/learn/recap-app/overview

Answer 1

请注意，在将文件上传到 ReCap 服务时，您不能使用本地文件系统路径。您基本上是在告诉 ReCap 服务器“从 C:\Dataset\FlowerPot... 下载这 7 个文件”，但服务器显然无法访问这些文件。

要解决此问题，您必须：

• 让您的照片可以通过一些公共 URL 访问（例如，通过将它们上传到临时 S3 存储桶），或者
• 将图片的实际内容添加到axios请求中，例如这样：

const FormData = require('form-data');

// ...

app.get('/api/forge/recap/photoscene/upload', function (req, res) {

    // ...

    const formData = new FormData();
    formData.append('file[0]', someImageBuffer0);
    formData.append('file[1]', someImageBuffer1);
    formData.append('file[2]', someImageBuffer2);
    formData.append('file[3]', someImageBuffer3);
    Axios({
        method: 'POST',
        url: 'https://developer.api.autodesk.com/photo-to-3d/v1/file',
        headers: {
            'Content-Type': 'multipart/form-data',
            'Authorization': 'Bearer ' + access_token
        },
        formData
    })

    // ...

});

顺便说一句。 Cannot set headers after they are sent to the client 错误是由 Express.js 框架发出的，表明在您的代码中某处您已经发送了对请求的响应，现在您正尝试向同一响应发送一些额外的数据，这是不允许的。在这种特定情况下，它可能是文件上传的“成功”分支，您可能会在其中向客户端发送一些错误信息 (res.send(response.data.Error.msg);)，但稍后您会再次向同一响应发送另一条消息 (@987654325 @)。将错误消息发送到客户端后，考虑使用return 语句，以便在响应中不发送其他数据。