Problem reading a file

Monkey Forums/Monkey Beginners/Problem reading a file

pit	(Posted 2014) [#1]

Hi all

I have problem to read a file.
Here is the code:

 
Import brl
		
Function Main()

		Local file:FileStream
		Local temp:Int
		file = FileStream.Open("Default.act","r")
		Repeat
			temp = file.ReadByte()
			Print temp
		Until file.Eof()
End

There is a "Default.act" file in my directory and in the subdirectory ".data".

But, at the first ReadByte, I receive this error message: "Monkey Runtime Error : Memory access violation"...

WHat's wrong with this code ?
Any idea ?

Thanks

Pit

Pharmhaus

(Posted 2014) [#2]

I struggled with this too, the documentation is wrong.
your .data folder needs to be yourfilename.data

pit	(Posted 2014) [#3]

Hi Pharmhaus

I confirm that the data directory is test.data (as the code is test.monkey).
So, should be ok ?

Pit

Pharmhaus

(Posted 2014) [#4]

I believe your path needs to be "monkey://data/Default.act" or something similar

ImmutableOctet(SKNG)

(Posted 2014) [#5]

This should work:

Strict

Public

' Preprocessor related:

' Make sure to add the "act" format to the binary files.
#BINARY_FILES += "*.act"

' Imports:
Import brl.stream
Import brl.filestream

' Functions:
Function Main:Int()
	' Local variable(s):
	Local File:Stream
	
	' Attempt to open a file-stream.
	File = FileStream.Open("monkey://data/Default.act", "r")
	
	' Check for errors:
	If (File = Null Or File.Eof()) Then
		Print("Unable to load the specified file.")
		
		' Return a negative response/exit code to the system.
		Return -1
	Endif
	
	' Loop through all of the bytes of the file:
	While (Not File.Eof())
		Print(File.ReadByte())
	Wend
	
	' Return the default response (Exit code) to the system.
	Return 0
End

Just a tip, but when you're dealing with streams, don't use the actual stream class something outputs (Unless that class provides functionality you absolutely need), use 'brl.stream.Stream' (In other words, just the 'Stream' class/type). This will make your code more versatile.

EDIT: As Pharmhaus said, the STDCPP/C++ Tool target is not a standard 'BBGame' target like GLFW/Desktop for example, so it won't have a data-folder. And from my experience, the "monkey://" prefix might not work either on this target. For such a situation, you need to either symbolically link the folder over, or copy it over manually (Or vice versa). That being said, if you have the folder there, you can just write "data/Default.act" for that target.

Pharmhaus

(Posted 2014) [#6]

please note that the "C++ Tool" does not support the datafolder so this might be another cause.

pit	(Posted 2014) [#7]

dear ImmutableOctet(SKNG),

THANKS ! Your code works !
I tried to modify my code, and the missing part was: #BINARY_FILES += "*.act" !
Adding this make my code running without problem !

a chance that you help me because I didn't see this in the documentation...

thanks again

pPit