Category Archives: Windows

Building QT 6.2 for Android on Windows

First I built QT 6.2 for Windows then I installed JDK8, CMake 3.21.3 and configured QT as follows:

set "CMAKE_ROOT=E:\PFiles\cmake-3.21.3-windows-x86_64\bin"
set "NINJA_ROOT=E:\PFiles\ninja-win"
set "JDK_ROOT=C:\Program Files\Java\jdk1.8.0_301\bin"
set "MINGW_ROOT=E:\PFiles\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin"
set "PERL_ROOT=E:\PFiles\Strawberry\perl\bin"
set PATH=E:\PFiles\Python35;%PATH%
rem Check if the tools are in PATH
where gcc
where mingw32-make.exe
where perl.exe
where javac.exe
where python.exe
where cmake.exe
where ninja.exe

set "ANDROID_SDK_ROOT=C:\Users\D-Ef\AppData\Local\Android\Sdk"
set "ANDROID_NDK_PATH=C:\Users\D-Ef\AppData\Local\Android\Sdk\ndk\21.3.6528147"
rem See qtbase\mkspecs\android-clang\qmake.conf
set "ANDROID_NDK_PLATFORM=android-23"
rem see %ANDROID_SDK_ROOT%\build-tools folder
set MY_INSTALL_PATH=E:\Qt\Qt6.2\android
set QT_HOST_PATH=E:\Qt\Qt6.2\windows

configure.bat -platform android-clang -prefix %MY_INSTALL_PATH% -android-sdk %ANDROID_SDK_ROOT% -android-ndk %ANDROID_NDK_PATH% -qt-host-path %QT_HOST_PATH% -android-abis x86_64 ^
  -DQT_NO_EXCEPTIONS=1 -release -force-debug-info -opensource -confirm-license

Building QT 6.2 for Windows with MSVC2019

I cloned QT repository:

git clone --recursive --branch v6.2.0
cd qt5

Looks like the command below is not required:

./init-repository --module-subset=all

because it prints:

Will not reinitialize already initialized repository (use -f to force)!

Enabling colors in Window 10 console

Add DWORD key VirtualTerminalLevel=1 to HKEY_CURRENT_USER\Console:


Disabling power button on Windows 10

When you mistakenly press power button your Windows 10 machine surprisingly shuts down. Switch it off with the following steps:


Mining Chia cryptocurrency on Windows 10

I bought a 6TB HDD for 19 990 rubles (in Russia) and started to mine Chia cryptocurrency on my Windows 10 machine using existing 500GB SSD as a temporary space. Now it is building the plots:


Error reading file: No space left on device

I had a large SQLite file C:\Users\D-Ef\AppData\Local\TradeClient\realtime.db that I was unable to copy to another disk. I tried:

split -n 10 -d -u realtime.db /mnt/d/db/rt
dd bs=65536 if=realtime.db of=/mnt/d/db/rt

in WSL, but got ‘error reading ‘realtime.db’: No space left on device’ with all the commands.

Finally I reduced page file size restarted my machine and copied the file in a usual way.


Installing Jabber Messaging Service on Ubuntu 16.04

sudo apt install ejabberd
ufw allow to any port 5280 proto tcp
ufw allow to any port 5222 proto tcp
ufw allow to any port 5269 proto tcp
ufw allow to any port 7777 proto tcp
sudo nano /etc/ejabberd/ejabberd.yml
## hosts: Domains served by ejabberd.
## You can define one or several, for example:
## hosts:
##   - ""
##   - ""
##   - ""
  - ""


###.   ====================
  ## The 'admin' ACL grants administrative privileges to XMPP accounts.
  ## You can put here as many accounts as you want.
         - "admin": ""

Mining Raven Coin (RVN) with KawPow on Windows 10

I run T-Rex miner as follows:

t-rex -a kawpow -o stratum+tcp:// -u <mywallet>.rigW -p x

and set the following parameters on my 1060 GTX 3GB card with MSI Afterburner:


How to prevent a Windows 10 machine from auto-locking

  • Right-click the Start button.
  • Click Search.
  • Type gpedit and hit Enter on your keyboard.
  • Double-click Administrative Templates.
  • Double-click Control Panel.
  • Click Personalization.
  • Double-click Do not display the lock screen.
  • Click Enabled.

Accessing a service credentials on Windows 10

I worked on some Windows app that registers a Windows service with a C++ code like this:

SC_HANDLE hService = ::CreateService(
    hSCM, m_szServiceName, _T(SERVICE_NAME),
    szFilePath, NULL, NULL, _T("RPCSS\0"), user_name, password);

where user_name and password are strings that are provided by the app user during the app install. Assuming the service name is MyService this creates a registry key HKEY_LOCAL_MACHINE\SECURITY\Policy\Secrets\_SC_MyService that is hidden by default and even administrator does not have a permission to read it and regedit does not show the content of HKEY_LOCAL_MACHINE\SECURITY key by default. But fortunately the access can be allowed by right clicking on HKEY_LOCAL_MACHINE\SECURITY and selecting Permissions or alternatively by running


in PowerShell. To list the content of the key I used the following command:

dir HKLM:\SECURITY\Policy\Secrets\_SC_MyService