Nativescript上传图片

Question

嗨，我想拍照并上传到我的服务器。这是我在下面的nativescript代码

这是我访问上传图像的请求的代码

一旦我运行我的应用程序并拍照将其发送到服务器。服务器返回一个错误消息，就像这个一样

注意：这是我用于nativescript应用程序的标头

var headers = {"Content-Type": "multipart/form-data"}

另外在nativescript中是否有文件系统模块的createReadStream（）方法？

Answer 1

你可以使用nativescript-background-http插件。这是你如何使用它

var bghttp = require("nativescript-background-http");
var session = bghttp.session("image-upload");

// save the image somewhere
var folder = fs.knownFolders.documents();
var pathOfImage = fs.path.join(folder.path, "Test.png");
var saved = image.saveToFile(pathOfImage,".png");
var request = 
        url : uploadPhotoUrl,
        method : "POST",
        headers : {
            "Content-Type" : "application/octet-stream"
        }
    };
var task = session.uploadFile(pathOfImage,request);

编辑

在后端（nodejs + express），您可以实现中间件功能并使用：

var rawParser = bodyParser.raw({
    type: 'application/octet-stream', extended: true
});

app.post("/photoUpload",rawParser,function(req,res){
var path = "uploads/test.jpg";
var file = fs.writeFileSync(path,req.body);
});

Answer 2

以下是文件上传到QuickBlox的示例（它支持AWS S3，支持“multipart / form-data”）

    var fs = require("tns-core-modules/file-system");
    var imagepicker = require("nativescript-imagepicker");
    var bghttp = require("nativescript-background-http");
    var parseUri = require("parseUri");


    var ile = fs.File.fromPath(this.filePath);
    var size = file.readSync().length;
    var contentType = 'image/jpeg';

    var uri = parseUri(createResult.blob_object_access.params),
       uploadUrl = uri.protocol + "://" + uri.authority + uri.path;

    var uploadParams = [];
    Object.keys(uri.queryKey).forEach(function(val) {
       uploadParams.push({name: val, value: decodeURIComponent(uri.queryKey[val])});
    });
    uploadParams.push({name: "file", filename: self.filePath, mimeType: contentType}); // If the element is named anything other than 'file', you're likely to receive a MaxPostPreDataLengthExceededError response when upload to S3.

    var request = {
        url: uploadUrl,
        method: "POST"
    };

    var session = bghttp.session("image-upload");
    var task = session.multipartUpload(uploadParams, request);

    function onEvent(e) {
        console.log("event: " + e.eventName);
        if(e.object.description){
          console.log(e.object.description);
        }
        if(e.error){
          console.log(e.error);
        }
        if(e.currentBytes){
          console.log(e.currentBytes + " of " + e.totalBytes);
        }
        if(e.data){
          console.log(e.data);
        }
    }

    task.on("progress", onEvent.bind(this));
    task.on("error", onEvent.bind(this));
    task.on("responded", onEvent.bind(this));
    task.on("complete", onEvent.bind(this));
});

关于gist https://gist.github.com/soulfly/b55d6c0dd9448bc1dc1133793a6ac22d的完整代码