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C++ 智能指针shared_ptr,weak_ptr,shared_from_this实践 - C/C++ - 清泛网 - 专注C/C++及内核技术
...指针 lock 时会加锁,因此尽量在最后的线程控制权转移的时候才lock,传递使用shared_ptr & 或 weak_ptr,可极大地减少锁的次数,提高效率。(强指针赋值加锁,弱指针不加锁且对象很小在栈上完成拷贝,效率相差不大)
2438c++11,sh...
js/php判断终端类型:PC访问、手机访问、微信访问 - 更多技术 - 清泛网 - ...
....href="https://www.tsingfun.com/index.php?m=wap";
}
</script>
不过有时候还是后端判断直接定位相应模板来得直接,不用中转一道,这里提供php的判断方法:
// 判断是否是手机端
function is_mobile() {
// 如果有HTTP_X_WAP_PROFILE则一定是移...
【解决】double free or corruption (!prev) - C/C++ - 清泛网 - 专注C/C++及内核技术
...,如果操作不当,存储的数据大于内存区大小,在free的时候也会检测出来,报这个错误,如:
char* buf = malloc(5);
memcpy(buf, "123456", 6);
free(buf); //free时报此错误
实际项目中可能此类问题没法直观定位到,推荐使用gcc自带的 asan...
UrsPahoMqttClient心跳问题解决——Paho底层已自动处理,设好KeepAlive就行...
... Paho 的 CommsSender 线程自动管理了。你只需要在 Connect 的时候传一个 keepAliveSeconds 参数就行。
Connect 积木块长这样:
Connect(brokerAddress, clientId, username, password, keepAliveSeconds)
keepAliveSeconds 设多少?
- 推荐设 30-60 秒
- 设 60 秒...
Style bottom Line in Android
... of the height.
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle" >
<solid android:color="#1bd4f6" />
</shape>
</item>
<item android:top="-2dp" android:rig...
How do I create a ListView with rounded corners in Android?
...encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:startColor="#SomeGradientBeginColor"
android:endColor="#SomeGradientEndColor"
android:angle="270"/>
<cor...
Typical .gitignore file for an Android app
...
You can mix Android.gitignore:
# built application files
*.apk
*.ap_
# files for the dex VM
*.dex
# Java class files
*.class
# generated files
bin/
gen/
# Local configuration file (sdk path, etc)
local.properties
with Eclipse.gitignore:
*.pydevproject
.project
.metadata
bin/**...
编译失败! Error: Your build failed due to an error in the AAPT stage,...
编译apk报错如下:
经过日志分析如下:
Tag <activity> attribute name has invalid character
[java] /tmp/1685410160630_0.39828964915976717-0/youngandroidproject/../build/AndroidManifest.xml:5: Tag <activity> attribute name has invalid character '�'.
&n...
CentOS 6.4下Squid代理服务器的安装与配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...载一个主页时,可以向Squid 发出一个申请,要Squid 代替其进行下载,然后Squid 连接所申请网站并请求该主页,接着把该主页传给用户同时保留一个备份,当别的用户申请同样的页面时,Squid 把保存的备份立即传给用户,使用户觉...
How to increase storage for Android Emulator? (INSTALL_FAILED_INSUFFICIENT_STORAGE)
...hat the "partition-size" is in megabytes, and that generally to install an APK you need at least twice as much disk space as the size of the APK.
– Christopher Orr
Dec 26 '10 at 17:11
...
