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Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术
...tl.h>
#include <sys/stat.h>
#include <unistd.h>
#define kPidFileName "app.pid"
bool enter_app_singleton() {
int fd = open(kPidFileName, O_RDWR | O_TRUNC);
if (fd == -1) {
//对应的锁文件当前不存在，试图创建该锁文件
fd = creat(kPidFileName, S_IRUSR|S_IWUSR|S_IRGRP...
Angularjs ng-model doesn't work inside ng-if
...
$scope.obj = {test: false};
}
</script>
<div ng-app >
<div ng-controller="main">
Test A: {{testa}}<br />
Test B: {{testb}}<br />
Test C: {{testc}}<br />
{{obj.test}}
<div>...
Extending the User model with custom fields in Django
...he best way to extend the User model (bundled with Django's authentication app) with custom fields? I would also possibly like to use the email as the username (for authentication purposes).
...
How to delete migration files in Rails 3
...s not the last one), I just perform a new rake db:migrate again.
If your application is already on production or staging, it's safer to just write another migration that destroys your table or columns.
Another great reference for migrations is: http://guides.rubyonrails.org/migrations.html
...
Can I control the location of .NET user settings to avoid losing settings on application upgrade?
...it yourself)
As for the second question, it depends on how you deploy the application. If you deploy via a .msi, then there are two hashes in the properties of the setup project (that the msi is built from), the 'upgrade code' and the 'product code'. These determine how the msi can be installed, ...
Recommended way to save uploaded files in a servlet application
... world code there are circumstances where storing uploaded files in the webapp's deploy folder will not work at all. Some servers do (either by default or by configuration) not expand the deployed WAR file into the local disk file system, but instead fully in the memory. You can't create new files i...
Create aar file in Android Studio
...
If your library is set up as an Android library (i.e. it uses the apply plugin: 'com.android.library' statement in its build.gradle file), it will output an .aar when it's built. It will show up in the build/outputs/aar/ directory in your module's directory.
You can choose the "Android Lib...
How can I specify a [DllImport] path at runtime?
...e of the other answers, using the DllImport attribute is still the correct approach.
I honestly don't understand why you can't do just like everyone else in the world and specify a relative path to your DLL. Yes, the path in which your application will be installed differs on different people's comp...
Client on node: Uncaught ReferenceError: require is not defined
So, I am writing an application with the node/express + jade combo.
7 Answers
7
...
What is the overhead of creating a new HttpClient per call in a WebAPI client?
...e ability to add HttpMessageHandlers into the request/response pipeline to apply cross cutting concerns. These could be for logging, auditing, throttling, redirect handling, offline handling, capturing metrics. All sorts of different things. If a new HttpClient is created on each request, then al...