Cannot open text file to write to with Apple script - applescript

Question

I am trying to create a log of when my computer turns off and on. To do this I am writing a script to run at start up that will write to a text file however it is telling me that I don't have permission to write to the file.
Using print statements I have determined that the try block terminates after the first line.
writeTextToFile(getTimeInHoursAndMinutes(), "Users/labspecialist/Desktop/system_log")
on writeTextToFile(theText, theFile)
try
-- Convert the file to a string
set theFile to theFile as string
-- Open the file for writing
set theOpenedFile to (open for access file theFile with write permission)
-- Write the new content to the file
write theText to theOpenedFile starting at eof
-- Close the file
close access theOpenedFile
-- Return a boolean indicating that writing was successful
return true
-- Handle a write error
on error
-- Close the file
try
close access file theFile
end try
-- Return a boolean indicating that writing failed
return false
end try
end writeTextToFile
on getTimeInHoursAndMinutes()
-- Get the "hour"
set timeStr to time string of (current date)
set Pos to offset of ":" in timeStr
set theHour to characters 1 thru (Pos - 1) of timeStr as string
set timeStr to characters (Pos + 1) through end of timeStr as string
-- Get the "minute"
set Pos to offset of ":" in timeStr
set theMin to characters 1 thru (Pos - 1) of timeStr as string
set timeStr to characters (Pos + 1) through end of timeStr as string
--Get "AM or PM"
set Pos to offset of " " in timeStr
set theSfx to characters (Pos + 1) through end of timeStr as string
return (theHour & ":" & theMin & " " & theSfx) as string
end getTimeInHoursAndMinutes
I expect when I run this to get an output of true and for my file to contain a new line of the current time. However it currently returns false with nothing written to the file.

Answer 1

The problem is that your script is using a file specifier in the open for access line, where it should use a POSIX file specifier (because you're feeding the command a POSIX path). It should look like this:
writeTextToFile(getTimeInHoursAndMinutes(), "/Users/labspecialist/Desktop/system_log")
on writeTextToFile(theText, theFile)
try
-- Convert the file to a string
set theFile to theFile as string
-- Open the file for writing
set theOpenedFile to (open for access POSIX file theFile with write permission)
-- Write the new content to the file
write theText to theOpenedFile starting at eof
-- Close the file
close access theOpenedFile
-- Return a boolean indicating that writing was successful
return true
-- Handle a write error
on error errstr
display dialog errstr
-- Close the file
try
close access file theFile
end try
-- Return a boolean indicating that writing failed
return false
end try
end writeTextToFile
P.s. And yes, you really should use that opening slash in the file path, though it seems to work regardless...