Lazarus

Programming => Operating Systems => Android => Topic started by: iru on August 04, 2022, 09:15:21 am

Title: [Solved] Writing to Android logfile.
Post by: iru on August 04, 2022, 09:15:21 am

Environment Win10, Laz 2012, fpc 3.20 Laz4Android2.0.12. All works OK.

Gentlefolk,

How do I write to the Android log file in the JNI application?????
I have a nasty bug/bad-code/? problem addressing a variable length array and writing some log file entries would be a great help.

Ian.

Title: Re: Writing to Android logfile.
Post by: DonAlfredo on August 04, 2022, 11:06:54 am

You might add this into your code.

Code: Pascal  [Select][+][-]

1. {$ifdef Android}
2. const
3.       ANDROID_LOG_UNKNOWN=0;
4.       ANDROID_LOG_DEFAULT=1;
5.       ANDROID_LOG_VERBOSE=2;
6.       ANDROID_LOG_DEBUG=3;
7.       ANDROID_LOG_INFO=4;
8.       ANDROID_LOG_WARN=5;
9.       ANDROID_LOG_ERROR=6;
10.       ANDROID_LOG_FATAL=7;
11.       ANDROID_LOG_SILENT=8;
12.  
13. function __android_log_write(prio:cint;tag,text:PAnsiChar):cint; cdecl; external 'liblog.so' name '__android_log_write';
14. {$endif}

In your code, use:

Code: Pascal  [Select][+][-]

1. procedure ShowLogMessage(value:ansistring);
2. begin
3.   {$ifdef Android}
4.   __android_log_write(ANDROID_LOG_INFO,'my app logger',pansichar(value));
5.   {$else}
6.     {$ifndef LCL}
7.     writeln('my app logger: '+value);
8.     {$endif}
9.   {$endif}
10. end;
11.  

Title: Re: Writing to Android logfile.
Post by: iru on August 05, 2022, 08:32:34 am

Thank you, I will give it a try in the next couple of days. Ian

Title: Re: Writing to Android logfile.
Post by: iru on August 05, 2022, 11:45:20 am

Add a 'cTypes' to the 'uses' statement and the program compiles correctly.

Writes to the log file. Now I just have to decipher the results.....

Thank you DonAlfredo you have saved me a lot of time and effort.

Ian