JS: electron use fs.readSync in render process
0
use fs.readSync() in render process,and element of buffer is always 0.
use fs.read() will get correct result.
const electron = window.require('electron');
const { remote } = electron;
const fs = remote.require('fs');
const fd = fs.openSync(localPath, 'r');
const fileStat = fs.fstatSync(fd);
const { size: fileSize } = fileStat;
const dataBuffer = Buffer.alloc(fileSize);
const readSize = 1024;
for(let i = 0; i < fileSize; i += readSize) {
fs.readSync(fd, dataBuffer, i, Math.min(fileSize - i, readSize), null);
console.log(dataBuffer);
}javascript electron fs
asked Jan 2 at 9:26
JiaKinJiaKin
1
add a comment |
0
use fs.readSync() in render process,and element of buffer is always 0.
use fs.read() will get correct result.
const electron = window.require('electron');
const { remote } = electron;
const fs = remote.require('fs');
const fd = fs.openSync(localPath, 'r');
const fileStat = fs.fstatSync(fd);
const { size: fileSize } = fileStat;
const dataBuffer = Buffer.alloc(fileSize);
const readSize = 1024;
for(let i = 0; i < fileSize; i += readSize) {
fs.readSync(fd, dataBuffer, i, Math.min(fileSize - i, readSize), null);
console.log(dataBuffer);
}javascript electron fs
asked Jan 2 at 9:26
JiaKinJiaKin
1
Forfsyou don't need to require it via electron remote (as it's default nodejs module). Writeconst fs = require('fs')simply. I don't know why it's not working the other way though.
– pergy
Jan 2 at 10:54
if useconst fs = require('fs')directly in render process, throw errorfs.openSync is not a function.Maybe it is because array is copied through remote ? Is there anyway to load a large file?
– JiaKin
Jan 2 at 14:29
add a comment |
0
0
0
use fs.readSync() in render process,and element of buffer is always 0.
use fs.read() will get correct result.
const electron = window.require('electron');
const { remote } = electron;
const fs = remote.require('fs');
const fd = fs.openSync(localPath, 'r');
const fileStat = fs.fstatSync(fd);
const { size: fileSize } = fileStat;
const dataBuffer = Buffer.alloc(fileSize);
const readSize = 1024;
for(let i = 0; i < fileSize; i += readSize) {
fs.readSync(fd, dataBuffer, i, Math.min(fileSize - i, readSize), null);
console.log(dataBuffer);
}javascript electron fs
asked Jan 2 at 9:26
JiaKinJiaKin
1
use fs.readSync() in render process,and element of buffer is always 0.
use fs.read() will get correct result.
const electron = window.require('electron');
const { remote } = electron;
const fs = remote.require('fs');
const fd = fs.openSync(localPath, 'r');
const fileStat = fs.fstatSync(fd);
const { size: fileSize } = fileStat;
const dataBuffer = Buffer.alloc(fileSize);
const readSize = 1024;
for(let i = 0; i < fileSize; i += readSize) {
fs.readSync(fd, dataBuffer, i, Math.min(fileSize - i, readSize), null);
console.log(dataBuffer);
}const electron = window.require('electron');
const { remote } = electron;
const fs = remote.require('fs');
const fd = fs.openSync(localPath, 'r');
const fileStat = fs.fstatSync(fd);
const { size: fileSize } = fileStat;
const dataBuffer = Buffer.alloc(fileSize);
const readSize = 1024;
for(let i = 0; i < fileSize; i += readSize) {
fs.readSync(fd, dataBuffer, i, Math.min(fileSize - i, readSize), null);
console.log(dataBuffer);
}const electron = window.require('electron');
const { remote } = electron;
const fs = remote.require('fs');
const fd = fs.openSync(localPath, 'r');
const fileStat = fs.fstatSync(fd);
const { size: fileSize } = fileStat;
const dataBuffer = Buffer.alloc(fileSize);
const readSize = 1024;
for(let i = 0; i < fileSize; i += readSize) {
fs.readSync(fd, dataBuffer, i, Math.min(fileSize - i, readSize), null);
console.log(dataBuffer);
}javascript electron fs
javascript electron fs
asked Jan 2 at 9:26
JiaKinJiaKin
1
asked Jan 2 at 9:26
JiaKinJiaKin
1
asked Jan 2 at 9:26
JiaKinJiaKin
1
asked Jan 2 at 9:26
JiaKinJiaKin
1
asked Jan 2 at 9:26
JiaKinJiaKin
1
1
Forfsyou don't need to require it via electron remote (as it's default nodejs module). Writeconst fs = require('fs')simply. I don't know why it's not working the other way though.
– pergy
Jan 2 at 10:54
if useconst fs = require('fs')directly in render process, throw errorfs.openSync is not a function.Maybe it is because array is copied through remote ? Is there anyway to load a large file?
– JiaKin
Jan 2 at 14:29
add a comment |
Forfsyou don't need to require it via electron remote (as it's default nodejs module). Writeconst fs = require('fs')simply. I don't know why it's not working the other way though.
– pergy
Jan 2 at 10:54
if useconst fs = require('fs')directly in render process, throw errorfs.openSync is not a function.Maybe it is because array is copied through remote ? Is there anyway to load a large file?
– JiaKin
Jan 2 at 14:29
For
fs you don't need to require it via electron remote (as it's default nodejs module). Write const fs = require('fs') simply. I don't know why it's not working the other way though.– pergy
Jan 2 at 10:54
For
fs you don't need to require it via electron remote (as it's default nodejs module). Write const fs = require('fs') simply. I don't know why it's not working the other way though.– pergy
Jan 2 at 10:54
if use
const fs = require('fs') directly in render process, throw error fs.openSync is not a function.Maybe it is because array is copied through remote ? Is there anyway to load a large file?– JiaKin
Jan 2 at 14:29
if use
const fs = require('fs') directly in render process, throw error fs.openSync is not a function.Maybe it is because array is copied through remote ? Is there anyway to load a large file?– JiaKin
Jan 2 at 14:29
add a comment |
1 Answer
1
active
oldest
votes
0
Return 0 probably means that the synchronized operation is failed with remote. You might capture exception in main thread.
BTW: Synchronized function call will be very slow in nodejs. That's why all these functions are named with Sync as suffix. I'd high recommend you write async code everywhere if it is possible.
answered Jan 2 at 9:44
stanleyxu2005stanleyxu2005
5,201104678
Maybe it is because array is copied through remote ? Is there anyway to load a large file? Transfer data from main process to render process is too slow.
– JiaKin
Jan 2 at 14:32
I don't exactly know why you want to load large local file into a browser window (render process). Here are some thoughts: (1) you can use native html5 file api to load file like any file uploader in browser (2) you can register your own secure protocol between main and render processes (like this github.com/stanleyxu2005/electron-utils/blob/master/lib/…) and then you can load contents at the fastest speed
– stanleyxu2005
Jan 2 at 15:40
1
just fyi, usingremoteis nothing more different thanTransfer data from main process to render process. If you noticed some perf slowness without remote when ipc between processes, using remote will only makes slower (cause it's sync ipc underlying)
– OJ Kwon
Jan 2 at 22:41
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f54003899%2fjs-electron-use-fs-readsync-in-render-process%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
Return 0 probably means that the synchronized operation is failed with remote. You might capture exception in main thread.
BTW: Synchronized function call will be very slow in nodejs. That's why all these functions are named with Sync as suffix. I'd high recommend you write async code everywhere if it is possible.
answered Jan 2 at 9:44
stanleyxu2005stanleyxu2005
5,201104678
Maybe it is because array is copied through remote ? Is there anyway to load a large file? Transfer data from main process to render process is too slow.
– JiaKin
Jan 2 at 14:32
I don't exactly know why you want to load large local file into a browser window (render process). Here are some thoughts: (1) you can use native html5 file api to load file like any file uploader in browser (2) you can register your own secure protocol between main and render processes (like this github.com/stanleyxu2005/electron-utils/blob/master/lib/…) and then you can load contents at the fastest speed
– stanleyxu2005
Jan 2 at 15:40
1
just fyi, usingremoteis nothing more different thanTransfer data from main process to render process. If you noticed some perf slowness without remote when ipc between processes, using remote will only makes slower (cause it's sync ipc underlying)
– OJ Kwon
Jan 2 at 22:41
add a comment |
0
Return 0 probably means that the synchronized operation is failed with remote. You might capture exception in main thread.
BTW: Synchronized function call will be very slow in nodejs. That's why all these functions are named with Sync as suffix. I'd high recommend you write async code everywhere if it is possible.
answered Jan 2 at 9:44
stanleyxu2005stanleyxu2005
5,201104678
Maybe it is because array is copied through remote ? Is there anyway to load a large file? Transfer data from main process to render process is too slow.
– JiaKin
Jan 2 at 14:32
I don't exactly know why you want to load large local file into a browser window (render process). Here are some thoughts: (1) you can use native html5 file api to load file like any file uploader in browser (2) you can register your own secure protocol between main and render processes (like this github.com/stanleyxu2005/electron-utils/blob/master/lib/…) and then you can load contents at the fastest speed
– stanleyxu2005
Jan 2 at 15:40
1
just fyi, usingremoteis nothing more different thanTransfer data from main process to render process. If you noticed some perf slowness without remote when ipc between processes, using remote will only makes slower (cause it's sync ipc underlying)
– OJ Kwon
Jan 2 at 22:41
add a comment |
0
0
0
Return 0 probably means that the synchronized operation is failed with remote. You might capture exception in main thread.
BTW: Synchronized function call will be very slow in nodejs. That's why all these functions are named with Sync as suffix. I'd high recommend you write async code everywhere if it is possible.
answered Jan 2 at 9:44
stanleyxu2005stanleyxu2005
5,201104678
Return 0 probably means that the synchronized operation is failed with remote. You might capture exception in main thread.
BTW: Synchronized function call will be very slow in nodejs. That's why all these functions are named with Sync as suffix. I'd high recommend you write async code everywhere if it is possible.
answered Jan 2 at 9:44
stanleyxu2005stanleyxu2005
5,201104678
answered Jan 2 at 9:44
stanleyxu2005stanleyxu2005
5,201104678
answered Jan 2 at 9:44
stanleyxu2005stanleyxu2005
5,201104678
answered Jan 2 at 9:44
stanleyxu2005stanleyxu2005
5,201104678
5,201104678
Maybe it is because array is copied through remote ? Is there anyway to load a large file? Transfer data from main process to render process is too slow.
– JiaKin
Jan 2 at 14:32
I don't exactly know why you want to load large local file into a browser window (render process). Here are some thoughts: (1) you can use native html5 file api to load file like any file uploader in browser (2) you can register your own secure protocol between main and render processes (like this github.com/stanleyxu2005/electron-utils/blob/master/lib/…) and then you can load contents at the fastest speed
– stanleyxu2005
Jan 2 at 15:40
1
just fyi, usingremoteis nothing more different thanTransfer data from main process to render process. If you noticed some perf slowness without remote when ipc between processes, using remote will only makes slower (cause it's sync ipc underlying)
– OJ Kwon
Jan 2 at 22:41
add a comment |
Maybe it is because array is copied through remote ? Is there anyway to load a large file? Transfer data from main process to render process is too slow.
– JiaKin
Jan 2 at 14:32
I don't exactly know why you want to load large local file into a browser window (render process). Here are some thoughts: (1) you can use native html5 file api to load file like any file uploader in browser (2) you can register your own secure protocol between main and render processes (like this github.com/stanleyxu2005/electron-utils/blob/master/lib/…) and then you can load contents at the fastest speed
– stanleyxu2005
Jan 2 at 15:40
1
just fyi, usingremoteis nothing more different thanTransfer data from main process to render process. If you noticed some perf slowness without remote when ipc between processes, using remote will only makes slower (cause it's sync ipc underlying)
– OJ Kwon
Jan 2 at 22:41
Maybe it is because array is copied through remote ? Is there anyway to load a large file? Transfer data from main process to render process is too slow.
– JiaKin
Jan 2 at 14:32
Maybe it is because array is copied through remote ? Is there anyway to load a large file? Transfer data from main process to render process is too slow.
– JiaKin
Jan 2 at 14:32
I don't exactly know why you want to load large local file into a browser window (render process). Here are some thoughts: (1) you can use native html5 file api to load file like any file uploader in browser (2) you can register your own secure protocol between main and render processes (like this github.com/stanleyxu2005/electron-utils/blob/master/lib/…) and then you can load contents at the fastest speed
– stanleyxu2005
Jan 2 at 15:40
I don't exactly know why you want to load large local file into a browser window (render process). Here are some thoughts: (1) you can use native html5 file api to load file like any file uploader in browser (2) you can register your own secure protocol between main and render processes (like this github.com/stanleyxu2005/electron-utils/blob/master/lib/…) and then you can load contents at the fastest speed
– stanleyxu2005
Jan 2 at 15:40
1
1
just fyi, using
remote is nothing more different than Transfer data from main process to render process. If you noticed some perf slowness without remote when ipc between processes, using remote will only makes slower (cause it's sync ipc underlying)– OJ Kwon
Jan 2 at 22:41
just fyi, using
remote is nothing more different than Transfer data from main process to render process. If you noticed some perf slowness without remote when ipc between processes, using remote will only makes slower (cause it's sync ipc underlying)– OJ Kwon
Jan 2 at 22:41
add a comment |
draft saved
draft discarded
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f54003899%2fjs-electron-use-fs-readsync-in-render-process%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
For
fsyou don't need to require it via electron remote (as it's default nodejs module). Writeconst fs = require('fs')simply. I don't know why it's not working the other way though.– pergy
Jan 2 at 10:54
if use
const fs = require('fs')directly in render process, throw errorfs.openSync is not a function.Maybe it is because array is copied through remote ? Is there anyway to load a large file?– JiaKin
Jan 2 at 14:29