8thString

Sunday, January 22, 2023

CPP Quick Guide

Basics
Hello world
User input
While loop
If statement
For loop
Switch statement
Read file using ifstream
Write to a file using ofstream

Containers
Basic usage of std::list
Basic usage of std::map
Basic usage of std::vector
Data type conversion

Windows API with Exmaples
DeviceIoControl
FindFirstVolumeW
GetDiskFreeSpaceExW
GetLogicalDrives
GetLogicalDriveStrings

C++/WinRT
C++/WinRT Hello World

Qt Cross-platform
Installing Qt Creator 9.0.1 on Windows 10
Qt console hello world
Qt Widget hello world
Qt Widget hello world code only

Keywords: C++, Qt, Programming, Tutorial

This is a quick start quide to prepare a development environment to develop against C++/WinRT.

System:
Development OS: Windows 10 Pro 22H2
Target: Windows 10 LTSB build 10.0.14393
IDE: Visual Studio 2022 (used 17.4.4)

Install Visual Studio 2022 Universal Windows Platform development workload. The following is very _important_ as this is what will allow you to create C++/WinRT project. Check C++ (v143) Universal Windows Platform tools, doing so will also enable and install corresponding SDK.

Set back and relax as this will download ~24GB of data from Microsoft.

After installing Visual Studio, create Windows Console Application (C++/WinRT)

For the Minimum version, select Windows 10 Anniversary Update (10.0; Build 14393)

The template should look like below

If all is well, running it should look like below

Keywords: Visual Studio, C++/WinRT

Saturday, January 21, 2023

Getting the last error code while debugging even if the Win32 API returned value was not saved

It is not uncommon that a Win32 API call return value is not checked in code. This information can prove to be very invaluable while debuging. Fortunately, Visual Studio saves pseudovariables which includes the value normally returned by GetLastError function. To view what would have returned by GetLastError use $err,hr in the Watch window.

Refs:
Visual Studio Pseudovariables
Tags: Visual Studio, CPP

Wednesday, January 04, 2023

Getting 'You are in emergency mode. After logging in, type "journalctl -xb" to view system logs, "systemctl reboot" to reboot, "systemctl default" or "exit" to boot into default mode' after rebooting Linux Mint 21.1 Vera

On my Linux Mint 21.1 Vera machine, rebooting the machine would show the following early in the boot process

You are in emergency mode. After logging in, type "journalctl -xb" to view system logs, "systemctl reboot" to reboot, "systemctl default" or "exit" to boot into default mode.
Press Enter for maintenance
(or press Control-D to continue):

For my specific case this happended because I have a USB drive connected to the CPU. Removing the the USB drive and rebooting the machine allow me to continue with the boot process.

Friday, December 30, 2022

Install TightVNC server on Linux Mint 21.1 Vera

One of the options to manage VirtualBox GUI on a Linux host is via VNC server. Below is quick setup to get it up and running.

$: sudo apt install tightvncserver

It is handy to be able to maintain the same session when connecting to Linux, so let's install tmux, like so:

$: sudo apt install tmux

Once TightVNC server and tmux are installed, run the following to create a session:

$: tmux
$: tightvncserver -nolisten tcp :1 -geometry 1024x768

The above commands creates a new tmux session and runs a new VNC server with geometry of 1024x768 on port :1

In multiple cases, I have observed that the VNC session created was just a solid gray backgroun, no xterm, no nothing. As a work-around install XFCE4 like below

$: sudo apt install xfce4 xfce4-goodies

Then update ~/.vnc/xstartup like below.

#!/bin/sh

xrdb "$HOME/.Xresources"
xsetroot -solid grey
#x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#x-window-manager &
# Fix to make GNOME work
export XKL_XMODMAP_DISABLE=1
/etc/X11/Xsession &
startxfce4 &

Thursday, December 29, 2022

Create MacOS High Sierra VM on VMware Fusion 8.5.10

Creating macOS High Sierra on Mac mini using VMware Fusion 8.5.10 in 2022 was not very straightforward. From VMware documentation this should been an easy drag and drop operation using VMware Fusion 12 but not with VMware Fusion 8. Anyway, this is how I got it working.

First of, below is the environment:

Host: Mac mini (Late 2014) with 16GB memory
Host OS: maçOS Mojave
VMware Fusion: 8.5.10

Below are the steps to create the VM:

On the host, visit https://support.apple.com/en-us/HT211683
Look for macOS High Sierra, I used this link - https://apps.apple.com/us/app/macos-high-sierra/id1246284741?mt=12
This opens the App Store. Download the High Sierra but don’t install it
Once downloaded it will be available in /Applications/Install macOS High Sierra.app
Clone or download a zip copy of the script that creates dmg file from an app file.The repo is located here - https://github.com/rtrouton/create_macos_vm_install_dmg

Create dmg using the script like below

sudo sh ~/Downloads/create_macos_vm_install_dmg-main/create_macos_vm_install_dmg.sh "/Applications/Install macOS High Sierra.app" ~/Documents

This should create a file in ~/Documents called macOS_10136_installer.dmg

With the DMG file available it is time to create the VM.

Create a new VM in VMware Fusion
Then select Install From Disk Image and hit on Continue
Select the macOS_10136_installer.dmg or browse for the location of the file and hit Continue.
Select macOS 10.12 as it is the latest that VMware Fusion 8.5.10 supports. Don't worry, it will work.
Notice the hard disk capacity is 40GB. If you think you needed more space in the VM you should change it, in my case I need more space, so I hit on Change Settings.
Give the VM a name, I am using macOSHighSierra2 and then hit on Save
In the Settings window, click on Hard Disk
Change Disk size to 80GB and hit on Apply
Now click on OK and close the window. It should now be ready to start the VM.

Have fun and enjoy your new macOS High Sierra!!!
Also tested to work on the following:
- macOS 10.14 (Mojave)
- macOS 10.15 (Catalina)

Wednesday, December 28, 2022

Qt Widget hello world code only

This post shows how to create a Hello World Qt Widget application in pure code, not using the UI Designer.

▣ Create a console application - consult this link for a quick guide.
▣ Change main.cpp like below
▣ Update CMakeList.txt like below

By Techno Scavenger at December 28, 2022 No comments:
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Labels: CPP, Qt

8thString

Sunday, January 22, 2023

CPP Quick Guide

C++/WinRT Hello World

C++/WinRT Hello World

Saturday, January 21, 2023

Getting the last error code while debugging even if the Win32 API returned value was not saved

Getting the last error code while debugging even if the Win32 API returned value was not saved

Wednesday, January 04, 2023

Getting 'You are in emergency mode. After logging in, type "journalctl -xb" to view system logs, "systemctl reboot" to reboot, "systemctl default" or "exit" to boot into default mode' after rebooting Linux Mint 21.1 Vera

Friday, December 30, 2022

Install TightVNC server on Linux Mint 21.1 Vera

Install TightVNC server on Linux Mint 21.1 Vera

Thursday, December 29, 2022

Create MacOS High Sierra VM on VMware Fusion 8.5.10

Create MacOS High Sierra VM on VMware Fusion 8.5.10

Wednesday, December 28, 2022

Qt Widget hello world code only

Qt Widget hello world code only

Installing QNX 6.4.1 on Ubuntu 20.04

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