PDF editor (textbox and sign/stamp): 

1) pdf viewer plus/Nuance PaperPort 14 which was auto installed during install brother printer driver and utility for DCP-L2550DW   

• Nuance PaperPort 14: support e-signature with path C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Nuance PaperPort 14\PDF Viewer SE.exe

• use foxit pdf reader to do other non-signature related editing

Brother printer App for android: iPrint&Scan

Lenovo Laptop Batter Charging Thresold Setting

Force install windows 11 even not compatile:

1. Download the Windows 11 ISO

2. Edit the Windows Registry to bypass the CPU check

In Windows, hit Start and type regedit, then hit enter to launch the Registry Editor. Navigate to Computer\HKEY_LOCAL_MACHINE\SYSTEM\Setup\MoSetup, 

In the right pane, right-click and pick New > DWORD (32-bit) Value. Name the value “AllowUpgradesWithUnsupportedTPMOrCPU” minus the quotes. Double-click on the new value you created, and enter 1 into the Value data field. Hit OK and close the registry editor.

3.  in the iso file run setup directly under windows

Google Calendar

• Event:  is scheduled for a certain day or a time of the day. Event do not automatically move next day unless you reschedule it manually

• Reminder:  scheduled for a certain date, and if you do not complete it before that day or on that day by going in and telling the REMINDER that it is completed then it will move to the next day. If not completed on the next day, it will automatically move to the next day, and so on and so forth until you go in and tell it that it is completed. Google Reminders is an app integrated with Google Assistant and Google Calendar to set and complete reminders.

• Task:  Google Tasks contrarily can significantly benefit a team. A team leader can update their group’s tasks in real-time. Also Google tasks can work with other androids "to do list" seamlessly.

Android

Android to do list

Android "To do List": synchronized to Google Calendar under "task" and it can be viewed by "Google Tasks" Apps.

Close Wechat/QQ:  Setting -> Additional setting -> Recent tasks manager -> Uncheck wechat/QQ

USB tethering: PC share phone's networking. Like Wifi hotspot.

Oppo Realme 5i phone mirror to PC via USB and scrpcy

1) setting -> about phone -> version (basedband & kernel) -> click "Build number" multiple times until pop up message saying "you are already a developer"

2) setting -> additional settings -> Developer options -> enable "developer options" and enable "USB debugging"

3) connect phone to PC via USB cable: once USB cable is connected,  it will pop up "use USB to charge only, transfer files and transfer photos", select "Transfer files"

4) in Windows, run "strcpy.exe" : if successfully, the phone will be mirrored to PC now.

Note: 

• current strcpy.exe version is 1.24. Download link is https://github.com/Genymobile/scrcpy/releases/tag/v1.24

• scrcpy --no-key-repeat --turn-screen-off --show-touches --stay-awake --window-x=0 --window-y=30

• scrcpy --help

Scrcpy experience

• turn screen on once scrcpy screen off: click right mouse button

• unlock screen: click and drag left mouse button: pin have to use mouse to select the number. Seems keyboard not work

IPhone

Enable Usb-c headset for phone call: 

setting -> Sounds & Haptics -> Headpone Safety -> USB Audio Accessories -> Connected to Headphones: Enable this option

Qemu

• Building Bare-Minimum Linux for QEMU: https://www.youtube.com/watch?v=MBx3JPgHYfI

• Qemu buildroot based on arm: https://www.youtube.com/watch?v=oy5PtFhVk5E

• Qemu in windows 10: https://linuxhint.com/qemu-windows/

C Language

Change function to Macro

int sum(int x, int y)

{

int z;

       z = x + y;

       return z;

}

Macro Method 1: 

#define sum(int x, int y) \

do {  \

int z; \

       z = x + y; \

      z; \

}  while(0)

Macro Method 2: 

#define sum(int x, int y) \

( {  \

int z; \

       z = x + y; \

      z; \

} )