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【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...ib_lport_inuse2(net, snum, hslot2, //判断hash2是否有该端口正在被使用
sk, saddr_comp);
if (!exist && (hash2_nulladdr != slot2)) {
hslot2 = udp_hashslot2(udptable, hash2_nulladdr);
exist = udp_lib_lport_inuse2(net, snum, hslot2, //再判断通配地址的情况
...
How to wrap async function calls into a sync function in Node.js or Javascript?
...
/*****sync function defined here *******/
function find_user(req_json, callback) {
process.nextTick(function () {
users.find(req_json,function (err,data)
{
if (!err) {
callback(null, data);
} else {
...
What's the difference between REST & RESTful
...get, post, put and delete
It should return the result only in the form of JSON or XML, atom, OData etc. (lightweight data )
REST based services follow some of the above principles and not all
RESTFUL services means it follows all the above principles.
It is similar to the concept of:
Object orien...
How to auto-reload files in Node.js?
...e. I just add more parameters for debugging and watching options.
package.json
"scripts": {
"dev": "cross-env NODE_ENV=development nodemon --watch server --inspect ./server/server.js"
}
The command: nodemon --watch server --inspect ./server/server.js
Whereas:
--watch server Restart the...
File uploading with Express 4.0: req.files undefined
...
The body-parser module only handles JSON and urlencoded form submissions, not multipart (which would be the case if you're uploading files).
For multipart, you'd need to use something like connect-busboy or multer or connect-multiparty (multiparty/formidable i...
MFC子窗口和父窗口(SetParent,SetOwner) - C/C++ - 清泛网 - 专注C/C++及内核技术
...化,但是它的WS_VISIBLE属性不会变。
Windows系统为什么要使用两种关系呢?这是为了更加灵活的管理窗口。举个例子:组合框(combobox)的下拉列表框(list box)可以超出组合框的父窗口的客户区,这样有利于显示,因此系统创建该...
How do you serve a file for download with AngularJS or Javascript?
...wnload using following code.
in html
<a class="btn" ng-click="saveJSON()" ng-href="{{ url }}">Export to JSON</a>
In controller
$scope.saveJSON = function () {
$scope.toJSON = '';
$scope.toJSON = angular.toJson($scope.data);
var blob = new Blob([$scope.toJSON...
What is the difference between RegExp’s exec() function and String’s match() function?
...the g flag
And .match() without the g flag is equivalent to .exec():
e1=JSON.stringify(str.match(/nop/))===JSON.stringify(/nop/.exec(str)); //true
//e2 ... e4 //true
e5=JSON.stringify(str.match(/(ab)a/))===JSON.stringify(/(ab)a/.exec(str)); //true
The .exec() function regexp.exec(str) will do...
How do I render a partial of a different format in Rails?
I'm trying to generate a JSON response that includes some HTML. Thus, I have /app/views/foo/bar.json.erb :
11 Answers
...
What character encoding should I use for a HTTP header?
...ecial chars like ✰ (Which is not ASCII)
Tip: you can encode anything in JSON.
Edit: may not be obvious at first, the character encoding defined in the header only applies for the response body, not for the header itself. (As it would cause a chicken-&-egg problem.)
I'd like to sum up all ...