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Make a directory using C++ for windows
If you want to create a folder at windows using c++/cpp language, there is an easy way for make a folder. You can do it just including the <windows.h> header file. To make a folder at C:\ drive named "deadman"#include<windows.h>int main(){ CreateDirectory ("C:\\deadman", NULL); return 0;}If you want to delete a fodler from the C:\ directory.#include<windows.h>int main(){ RemoveDirectory("C:\\deadman"); retur...
C++,Directory,Windows,CreateDirectory,Example 2012-02-25 04:26:16
The magic of go:linkname
When writing Go program, there is frequent need on using time.Sleep() function to pause the logic for some time. And if jumping to the definition of this function, can see below definition: // Sleep pauses the current goroutine for at least the duration d. // A negative or zero duration causes Sleep to return immediately. func Sleep(d Duration) I's strange that there is no function body defined here. What happened? The actual definition of the function body is residing at runtime/time.go&nb...
TRICKS,GO:LINKNAME,GOLANG 2022-04-10 08:39:00
Examples of bad design
Good designs always help users solve their problems in a convenient and familiar way. It takes little or no time for users getting used to the product with a good design. In contrast, bad designs frequently introduce confusion and complexity to users. Before we design any product, we should think carefully about every aspect of the product. We share some really bad design here to show how they can affect people's life. 1. USB Connector Have you ever put one in right on the first try? We frequen...
Bad design,Usability,Web design 2013-09-25 22:57:49
new() and make() in GoLang
GoLang is a modern, statically typed, compiled programming language designed for building scalable, concurrent, and efficient software. It provides various built-in functions and features that help developers write concise and efficient code. Among them are the new() and make() functions, which may appear similar at first glance but serve different purposes in GoLang and are crucial for memory allocation and data initialization. In this blog article, we will explore the differences between the n...
The internals of slice in GoLang
There are 3 components of slice:a) Pointer: Points to the start position of slice in the underlying array;b) length (type is int): the number of the valid elements of the slice;b) capacity (type is int): the total number of slots of the slice. Check the following code: package main import ( "fmt" "unsafe" ) func main() { var s1 []int fmt.Println(unsafe.Sizeof(s1)) } The result is 24 on my 64-bit system (The pointer and int both occupy 8 bytes). In the next example, I will use gdb to poke t...
Check file readability in Java
File operation is quite platform dependent. Although Java is a cross platform programming language, the file operation in Java is also platform dependent. The obvious evidence is the file permission check. In Java, we can call canRead(), canWrite() and canExecutable() to check whether the program can read, write or execute the file specified. However, on Windows, when we call canRead() on a File object, we may get unexpected result. Actually, on Windows, when we call canRead() on a File object, ...
Understanding Slice Behavior in Go
In Go, understanding how slices behave when passed to functions is crucial for writing efficient and bug-free code. This behavior is often a source of confusion for many developers, especially those new to the language. In this article, we'll explore the difference between passing slices by value and by reference, and how it impacts the modification of slices within functions. Introduction In Go, slices are a fundamental data structure used to work with sequences of elements. They are essentiall...
PASS BY REFERENCE,ARRAY,SLICE,PASS BY VALUE 2024-03-10 06:43:51
Run code with multiple files in the same main package in GoLang
To run a GoLang program, there needs to be a main() function defined. In some cases when developing some demo program which has multiple files and just wanna put them in the same main package and this folder is not in GOPATH, how to run the program? Let's say we have following folder structure where the main() function is defined in main.go. If you just run below command, it would fail to start to run the program and gives some error if some struct is defined in other files and being used. PS D...
EXECUTABLE,GOLANG,MAIN PACKAGE,MULTIPLE FILE 2021-05-15 10:20:10
A mini post on GoLang context
In a GoLang web server, every request coming in will be handled by a goroutine. In the request handler, the logic may also need to create new goroutine to handle other tasks like RPC call. When the request is processed and response is returned, these goroutines created need to be exited so that no goroutine leak should happen. package main import ( "fmt" "log" "net/http" ) func main() { http.HandleFunc("/echo", func(w http.ResponseWriter, r *http.Request) { fmt.Println(&r) w.Write(...
HTTP is not a transport protocol, HTTP is not RPC
Recently there was a question on the forums asking why we encourage usage of HttpRequestMessage<T> / HttpResponseMessage<T> in the signature of a web api implementation. The point made in the post is that if you have an ICalculator contract which your API implements, then it’s violating SOC / inappropriate to have those messages as params and in the contract. The argument is valid when looking at HTTP from the standpoint of an RPC mechanism, which is actually a quite co...
HTTP,Transport protocol,RPC 2012-01-19 10:14:26
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