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Simulate delayed and dropped packets on Linux
I would like to simulate packet delay and loss for UDP and TCP on Linux to measure the performance of an application. Is there a simple way to do this?
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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...的复制粘贴功能
【Socket】 ClientSocketAI2Ext 拓展加强版：TCP/IP传输协议
【短信平台接入】 AliSms 拓展：阿里云短信平台接入，短信验证码
【设备信息】 PhoneInfo 拓展：获取手机等设备软硬件、版本等相关信息
【数据库】 SQLit...
constant pointer vs pointer on a constant value [duplicate]
... nor be reassigned to point to another object.
Example:
void Foo( int * ptr,
int const * ptrToConst,
int * const constPtr,
int const * const constPtrToConst )
{
*ptr = 0; // OK: modifies the "pointee" data
ptr = 0; // OK: modifies the pointer
*ptrToCons...
cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术
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jmp done
save_string:
mov dword ptr [di], eax
mov dword ptr [di + 4], ebx
mov dword ptr [di + 8], ecx
mov dword ptr [di + 12], edx
add di, 16
ret
crlf ...
How to open a web server port on EC2 instance
...s apart of
Click on Inbound Rules
Use the drop down and add HTTP (port 80)
Click Apply and enjoy
share
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What is the use of having destructor as private?
...ctor, i.e., you want the object to only be destroyed through other means.
http://blogs.msdn.com/larryosterman/archive/2005/07/01/434684.aspx gives an example, where the object is reference counted and should only be destroyed by the object itself when count goes to zero.
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What's the point of malloc(0)?
...owever, in the very same implementation of the standard C library, realloc(ptr, 0) frees ptr and returns NULL.
– Medinoc
Apr 12 '18 at 14:05
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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
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MQTT 发明于 1999 年，为物联网设计的轻量级协议，基于TCP协议实现。
MQTT 协议文档：https://mqtt.org/
虽然 App Inventor 有现成的 MQTT 扩展，但它们需要额外的 JavaScript 或外部配置文件。此处介绍的 MQTT 客户端组件完全独...
Is there a printf converter to print in binary format?
...Assumes little endian
void printBits(size_t const size, void const * const ptr)
{
unsigned char *b = (unsigned char*) ptr;
unsigned char byte;
int i, j;
for (i = size-1; i >= 0; i--) {
for (j = 7; j >= 0; j--) {
byte = (b[i] >> j) & 1;
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PDO closing connection
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According to documentation you're correct (http://php.net/manual/en/pdo.connections.php):
The connection remains active for the lifetime of that PDO object. To
close the connection, you need to destroy the object by ensuring that
all remaining references to it...