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Modbus硬件控制01——什么是Modbus - 创客硬件开发 - 清泛IT社区，为创新赋能！
...12:37 编辑
Modbus算是嵌入式领域比较经典一种通信协议，不管你是初学者，还是工作多年的工程师，都很有必要了解一下。1.什么是Modbus?1.什么是Modebus它是一个Bus，即总线协议。比如串口协议、IIC协议、SPI都是通信协议。你接触...
Read a file in Node.js
...
console.log('received data: ' + data);
response.writeHead(200, {'Content-Type': 'text/html'});
response.write(data);
response.end();
} else {
console.log(err);
}
});
Thanks to dc5.
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Where and why do I have to put the “template” and “typename” keywords?
...
(See here also for my C++11 answer)
In order to parse a C++ program, the compiler needs to know whether certain names are types or not. The following example demonstrates that:
t * f;
How should this be parsed? For many languages a compiler do...
Passing variable arguments to another function that accepts a variable argument list
...
Maybe throwin a rock in a pond here, but it seems to work pretty OK with C++11 variadic templates:
#include <stdio.h>
template<typename... Args> void test(const char * f, Args... args) {
printf(f, args...);
}
int main()
{
int a = 2;
test("%s\n", "test");
test("%s %d %d %p\n"...
What is the “assert” function?
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"assert usually raises an exception" -- in C++ it does not rise "exception" it calls abort... it is little bit different.
– Artyom
Oct 15 '09 at 10:55
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Why is volatile not considered useful in multithreaded C or C++ programming?
...le unnecessary. We can just remove the volatile qualifier entirely.
Since C++11, atomic variables (std::atomic<T>) give us all of the relevant guarantees.
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improve this answer
...
HTTP GET request in JavaScript?
...tion() {
if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
callback(xmlHttp.responseText);
}
xmlHttp.open("GET", theUrl, true); // true for asynchronous
xmlHttp.send(null);
}
sh...
Does anyone have benchmarks (code & results) comparing performance of Android apps written in Xamari
... multipe forms to execute code in:
RenderScript (CPU and GPU)
Java (SDK)
C++ (NDK)
OpenGL (GPU)
It is quite obvious that when executing code the more native the solution the faster it will be. A run-time based language will never beat a language that directly runs on the CPU.
But on the other h...
How to set cornerRadius for only top-left and top-right corner of a UIView?
...View: UIView = {
let v = UIView(frame: CGRect(x: 10, y: 10, width: 200, height: 200))
v.backgroundColor = .red
return v
}()
override func loadView() {
super.loadView()
view.addSubview(theView)
}
override func viewWillLayoutSubviews() {
...
Get and Set a Single Cookie with Node.js HTTP Server
...kies = parseCookies(request);
// To Write a Cookie
response.writeHead(200, {
'Set-Cookie': 'mycookie=test',
'Content-Type': 'text/plain'
});
response.end('Hello World\n');
}).listen(8124);
console.log('Server running at http://127.0.0.1:8124/');
This will store all cookies into t...