[英]Using Alchemy API Synchronously
I am attempting to write a pure function to use the Alchemy API with the watson-developer-cloud npm package, but I cannot figure out how to execute its calls synchronously. 我正在尝试编写一个纯函数,以将Alchemy API与watson-developer-cloud npm软件包一起使用,但是我无法弄清楚如何同步执行其调用。 Is there an alternative method or package whereby I could receive its results synchronously?
是否有其他方法或软件包可以使我同步接收其结果? Blocking while the I/O is occurring is absolutely fine.
在发生I / O时阻塞绝对是可以的。
You can not do synchronous calls with the watson-developer-cloud
npm module. 您无法使用
watson-developer-cloud
npm模块进行同步调用。 What you can do is use Promises and mimic the synchronous model. 您可以做的是使用Promises并模仿同步模型。
The example below shows how to call the AlchemyVision recognizeFaces
method using promises: 下面的例子说明如何调用AlchemyVision
recognizeFaces
使用承诺的方法:
var watson = require('watson-developer-cloud');
var Q = require('q');
var alchemy_vision = watson.alchemy_vision({
api_key: '<api_key>'
});
// Creates a promise-returning function from a Node.js-style function
var recognizeFaces = Q.denodeify(alchemy_vision.recognizeFaces.bind(alchemy_vision));
var params = {
url: 'http://si.wsj.net/public/resources/images/BN-BY925_mag041_OZ_20140318165119.jpg'
};
recognizeFaces(params).then(function (keywords) {
console.log(JSON.stringify(keywords, null, 2));
}).catch(function (err) {
console.log('error:', err);
});
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