FTC Creating Log Files 202008

Existing Log Files

• FTC workshop debugging
  • log on page 72

On Drivers Station

maybe this was on the controller hub with a keyboard plugged in

• ... -> File Manager app -> Documents -> driverStationLog.txt

• saw a log on the driver station
• File Manager app
  • Documents
    • driverStationLog.txt

• print to controller log file
• Tom Eng Log file tips

Using

• check date
  • Ubuntu date

 adb shell date
     Thu Aug 6 15:50:46 PDT 2020

• is correct (3:50 pm)
• Set the date from a shell on Android

• write to
  • FTC Tech Tip Log files
  • Tom Eng Trouble Shooting Guide DbgLog removed in 3.3 see section 16.7.2

Create Log Files

• Redit Write to file This references the St. Paul Academy Log.java file.
• St. Paul Academy Log.java HOMAR FTC Library]
  • FTC Log.java Modified 202008

TBD: add comments to above

     To remove a null pointer exception the follow modifications were made.
     See the following added around line 9
       import java.lang.String;

     See the following added around line 30
       line = new String("");

Date info

TBD: Move this to performance maasurement

• System e.g. nanotime currentTimeMillis

Time Format References

Effective for creating file names

• Simple Date Format Official site. e.g. This is what I added to a file name: "yyyyMMddHHmm"
• Date Format Official site

Example Code

• Source for the following code

 import java.text.SimpleDateFormat;  
 import java.util.Date;  
 public class SimpleDateFormatExample {  
 public static void main(String[] args) {  
     Date date = new Date();  
     SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");  
     String strDate= formatter.format(date);  
     System.out.println(strDate);  
   }  
 }

Open AppData directory

• How to Access Hidden Folders

Windows
Live files are usually stored in two locations, the Roaming and Local folders contained within the AppData folder (Users\[your username]\AppData\)

To open the AppData folder on Windows 10, 8 & 7:

Open File Explorer/Windows Explorer
Type %AppData% into the address bar and hit enter
Navigate to the required folder (Roaming or Local)


To permanently display all hidden folders on Windows 10 & 8:

Open File Explorer/Windows Explorer
Click View then select Options

In the Folder Options window, choose View, select Show hidden files, folders, and drives, and then click OK