问题
我正在使用Promise(s)在加载库时获取回调。每个承诺都会通过ipcRenderer向ipcMain发送一条消息,并包含一个回调函数。
回调函数将按预期方式调用,但显示错误:“成功不是函数”(请看下面的代码)。
窗口:
function loadLibrary() {
loadLibraryExtension('Database Manager', 'db').then(() => {
return loadLibraryExtension('Path Extesnion', 'path');
}).then(() => {
return loadLibraryExtension('Excel Extension', 'excel4node');
}).then(() => {
return loadLibraryExtension('Auto updater', 'autoupdater');
}).then(() => {
onLibrariesLoaded();
});
}
var loadLibraryExtension = (status, library) => {
return new Promise(function (resolve, reject) {
$('#current-load').html(status);
ipcRenderer.send('load',
library,
resolve(),
reject()
);
});
}
主要过程:
var db;
var path;
var excel;
var autoUpdater;
var load = {
'db': () => { db = require('./dbmanager.js'); },
'path': () => { path = require('path'); },
'excel4node': () => { excel = require('excel4node'); },
'autoupdater': () => {
autoUpdater = require('electron-updater');
autoUpdater.autoDownload = false;
autoUpdater.autoInstallOnAppQuit = false;
}
}
ipcMain.on('load', function (event, library, succes, error) {
try {
load[library]();
} catch (err) {
Error(err);
error(err);
return;
}
succes();
});
我不希望出现任何错误,但是我不断得到
TypeError: succes is not a function
at EventEmitter.<anonymous> (C:\git\library-system\src\main.js:40:3)
at EventEmitter.emit (events.js:194:13)
at WebContents.<anonymous> (C:\git\library-system\node_modules\electron\dist\resources\electron.asar\browser\api\web-contents.js:390:13)
at WebContents.emit (events.js:194:13)
TypeError: succes is not a function
at EventEmitter.<anonymous> (C:\git\library-system\src\main.js:40:3)
at EventEmitter.emit (events.js:194:13)
at WebContents.<anonymous> (C:\git\library-system\node_modules\electron\dist\resources\electron.asar\browser\api\web-contents.js:390:13)
at WebContents.emit (events.js:194:13)
TypeError: succes is not a function
at EventEmitter.<anonymous> (C:\git\library-system\src\main.js:40:3)
at EventEmitter.emit (events.js:194:13)
at WebContents.<anonymous> (C:\git\library-system\node_modules\electron\dist\resources\electron.asar\browser\api\web-contents.js:390:13)
at WebContents.emit (events.js:194:13)
TypeError: succes is not a function
at EventEmitter.<anonymous> (C:\git\library-system\src\main.js:40:3)
at EventEmitter.emit (events.js:194:13)
at WebContents.<anonymous> (C:\git\library-system\node_modules\electron\dist\resources\electron.asar\browser\api\web-contents.js:390:13)
at WebContents.emit (events.js:194:13)
答案 0 :(得分:0)
您要在渲染器中发送args
ipcRenderer.send('load', library, resolve(), reject());
并尝试在主流程中接收
function (event, library, succes, error) {...
首先,您发送了resolve()
,这不是开始的功能。 Promise.resolve()返回Promise,而不是函数。
第二,Electron IPC的设计不允许发送不可序列化的值。简而言之,您无法发送函数并在其他进程中执行它。您应该从主进程通过webContents.send
或event.sender.send
将信号发送回渲染器,然后让渲染器进程解析进程中的Promise。