Title: Creating a logfile and append text to it
Question: This is just some simple code for creating a log file and for append a text to it.
Answer:
const
BreakingLine = '//----------------------------------------------------------------------------//';
//** This procedure just creates a new Logfile an appends when it was created **
procedure CreateLogfile;
var
T:TextFile;
FN:String;
begin
// Getting the filename for the logfile (In this case the Filename is 'application-exename.log'
FN := ChangeFileExt(Application.Exename, '.log');
// Assigns Filename to variable F
AssignFile(F, FN);
// Rewrites the file F
Rewrite(F);
// Open file for appending
Append(F);
// Write text to Textfile F
WriteLn(F, BreakingLine);
WriteLn(F, 'This Logfile was created on ' + DateTimToStr(Now);
WriteLn(F, BreakingLine);
WriteLn(F, '');
// finally close the file
CloseFile(F);
end;
// Procedure for appending a Message to an existing logfile with current Date and Time **
procedure WriteToLog(aLogMessage:String);
var
T:TextFile;
FN:String;
begin
// Getting the filename for the logfile (In this case the Filename is 'application-exename.log'
FN := ChangeFileExt(Application.Exename, '.log');
//Checking for file
if (not FileExists(FN)) then
begin
// if file is not available then create a new file
CreateLogFile;
end;
// Assigns Filename to variable F
AssignFile(F, FN);
// start appending text
AppendFile(F);
//Write a new line with current date and message to the file
WriteLn(F, DateTimeToStr(Now) + ': ' + aLogMessage);
// Close file
CloseFile(F)
end;