For loop in Windows batch script
The syntax of for loop in Windows bat file is a little strange. If you are familiar with for loop in other programming languages, you may write the following code: […]
admin
setlocal ENABLEDELAYEDEXPANSION ENABLEEXTENSIONS
You may see this code in a windows bat script. You may think this command enables command extensions and delayed variable expansion. But this command actually have 3 effects: set […]
exit /b in Windows batch script
You must be familiar with the exit command. If you execute this command in a DOS window, the DOS window closes and the cmd process exits. This is like closing […]
The difference between %CD% and %~dp0
It seems both can get the current directory. What is the difference between %~dp0 and %CD%, then? First, %~dp0 can only be used in bat file while %CD% can be […]
%0, %~0, %~f0, %~dp0 in bat file
In windows bat file, %0, %1,…, %9 are the first, second, …, tenth parameter of the command line. The first parameter is the command itself. Suppose the bat file is […]
invalid use of incomplete type ‘RSA {aka struct rsa_st}’
If you are compiling code that use old openssl lib(such as openssl 1.0.2) with the latest openssl lib such as openssl 1.1.0, you will meet this error: invalid use of […]
the SSL/TLS handshake failed and the encrypted channel could not be established. The sslErrors() signal should have been emitted.
In my experience in using Qt, I find it would be hard to make a business app without the help of Qt experts. In other words, you need to buy […]
How to printf long long?
When compiling with Mingw 32bit, the size of long and unsigned long is 4 bytes, the size of long long and unsigned long long is 8 bytes. To print a […]
How to generate MODULUS for RSA using openssl?
If you use openssl RSA API to encrypt/decrypt/sign/verify, you will need a MODULUS, which is part of a RSA public key. To generate a MODULUS, first you need to generate […]
Softmax and cross entropy
Softmax is unlike other activation functions such as tanh and sigmoid, which take one number as input and output one number. Softmax activation function takes several numbers as input and […]