opentoread not working after the first call

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dandrews

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Posted: 11th Jun 2023 01:57

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so i was messing around trying something for another project and i noticed that in this code when i try to opentoread on the second go it says file not found?

+ Code Snippet

SetErrorMode(2)

// set window properties
SetWindowTitle( "ghjghj" )
SetWindowSize( 1024, 768, 0 )
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 )
// set window properties
global teststring as string
global done as integer
global textid as string
textid = "test.txt"
fileID = OpenToWrite(textid , 0)
fileread = OpenToRead(textid)
global readtest as string
readtest = "failed"
WriteLine(fileID, "this is a test")
CloseFile(fileID)

teststring =ReadLine(fileread) 
closefile(fileread)

readtest =ReadLine(fileread) 
closefile(fileread)
do
	
	print(teststring)
	print(readtest)
	
sync()
loop

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Virtual Nomad

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Posted: 11th Jun 2023 02:11 Edited at: 11th Jun 2023 02:18

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short version is you closed the file before reading it the 2nd time.

longer version is that it actually doesn't say "file not found". it says (in essence) "the reference to the file is invalid" (you closed it). if you rem out line 25, you'll get the same error @ line 26 (it's already closed).

more: it's probably not a good idea to open the same file for both read and write at the same time.

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dandrews

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Posted: 11th Jun 2023 02:16

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but i iclose the file right before reading it and i thought if i used fileread (opentoreadfile) it doe not open it again??

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Virtual Nomad

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Posted: 11th Jun 2023 02:22 Edited at: 11th Jun 2023 02:25

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edited my first response but it's gonna cause a headache, as is. but, if you insist, see the changes:

+ Code Snippet

SetErrorMode(2)

// set window properties
SetWindowTitle( "ghjghj" )
SetWindowSize( 1024, 768, 0 )
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 )
// set window properties
global teststring as string
global done as integer
global textid as string
textid = "test.txt"
fileID = OpenToWrite(textid , 0)
fileread = OpenToRead(textid)
fileread2 = OpenToRead(textid)
global readtest as string
readtest = "failed"
WriteLine(fileID, "this is a test")
CloseFile(fileID)

teststring =ReadLine(fileread) 
closefile(fileread)

readtest =ReadLine(fileread2) 
closefile(fileread2)
do

	print(fileread)
	print(fileread2)
	print(teststring)
	print(readtest)
	
sync()
loop

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VN @ itch.io | AGK Jam HQ
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dandrews

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Posted: 11th Jun 2023 02:36

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ok i see but im still somewhat lost because i assumed if i closed the file it would be available again.

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Virtual Nomad

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Posted: 11th Jun 2023 03:26 Edited at: 11th Jun 2023 03:32

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Quote: "but i iclose the file right before reading it"

but it needs to be open to read it.

here you read & closed it:

+ Code Snippet

teststring =ReadLine(fileread) 
closefile(fileread)

then immediately tried to read from it (while its closed):

+ Code Snippet

readtest =ReadLine(fileread)

and close it again:

+ Code Snippet

closefile(fileread)

without ever re-opening it (to make it available again)?

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dandrews

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Posted: 11th Jun 2023 03:35

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i have fileread = opentoread(fileid) so i thought readline(fileread) would open it to read the line??

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Virtual Nomad

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Posted: 11th Jun 2023 03:45 Edited at: 11th Jun 2023 03:47

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fileread is holding the ID# of the instance of OpenToRead(). that's where it's opened (and assigned an ID for later reference)

readline(fileread) is reading the line from the file referenced via that instance of the open file (that's all).

ie, on the first attempt to read the first line, teststring is assigned the value of readline(fileread).

you've read the help files, right?
OpenToRead(), ReadLine(), et al?

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dandrews

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Posted: 11th Jun 2023 04:11 Edited at: 11th Jun 2023 04:14

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This post has been marked by the post author as the answer.

agh i see thank you. so if i used readfile = opentoread(fileid) then closefile(fileid) ... i would then have to define readfile as readfile= opentoread(fileid) again

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