Newbie Question / remove file

Getting Started Newbie Questions
#1

I am successfully using the camera example in one of my scenes and I don’t want to leave photos stored in any directory of any device.

I am using this from the os.remove example

--forward declaration local destDir = system.DocumentsDirectory  -- Location where the file is stored local result, reason = os.remove( system.pathForFile( "Picture1.jpg", destDir ) ) -- Scene event functions   local function backButtonTouch( event ) if ( event.phase == "began" ) then audio.play( flick ) if result then     print( "Picture1 removed" ) else     print( "Picture1 does not exist", reason ) end elseif ( event.phase == "ended" ) then composer.gotoScene( "menu" ) end return true end

The simulator does not give me any error. My test device either. The picture is saved as Picture1 in the Pictures directory of my device. If I take another picture it will be saved as Picture2 … Picture3 … etc.

Could someone help me understand this?

#2

What don’t you understand?

#3

Hi! The photo is not deleted. I still have a file named PictureX, (X = 1,2,3,4,5,etc)
every time I take a photo.

#4

I want to delete the “PictureX” file when the user leaves the scene using the back button and when the user touch the camera button to take a new photo.

#5

Can anyone teach me how to do this?

I’m using the Corona sample “camera” to make my camera button works.
I read the “lfs” tutorial and to be honest I do not understand it.

Do I need to requiere “lfs” in my scene?

I don’t know which directory the Corona sample “camera” developers use to store the taken photos.

Do I need to write my own code to do this?

Do I need to make a “path folder” to store all the taken photos?

Thanks in advance.

#6

I’m not asking anyone to write this part for me, I want to do it myself, to understand it myself, just ask for a start, something that can clarify the question of how to do this.

#7

Please post your code here so I can take a look.

I believe by default, your photo goes to the system temporary folder (system.TemporaryDirectory) and not to the Documents folder (system.DocumentsDirectory). unless you have used some function to move the file.

#8

Thanks for your answer. As soon as I get home I’ll upload the code.

#9

If you want the photo to be deleted on back button press then you need to include the deletion code in the back button event. You posted…

local result, reason = os.remove( system.pathForFile( "Picture1.jpg", destDir ) )

but that will only ever delete Picture1.jpg

#10

@wellison.maceio @adrianm
I’ll be uploading the full code on Friday when I get home.

#11

hi,
I’ve read and reread the composer and scope topics a few times now. I don’t see anything vague, it’s seems very clear what happens and when, however, when I move buttons or text inside or outside the create/show functions, they don’t always operate the same. it’s crazy I have been struggling with this for over a week. I don’t see how the below can possibly work in any programming language…  the code below:

if (myDataTable[row.index] ~= nil) then

    local rowText = display.newText(row, myDataTable[row.index], 70, rowTitle.y, nill, 14 )

    rowText:setFillColor(0)

    sceneGroup:insert(rowText)

    count = count + 2

    print(" count = " … tostring(count))

end

yields this in the monitor/log window:

13:12:01.966   count = 2

13:12:01.976   count = 2

13:12:01.987   count = 2

13:12:01.998   count = 2

13:12:02.010   count = 2

13:12:02.030   count = 2

13:12:02.030   count = 2

13:12:02.045   count = 2

13:12:02.056   count = 2

13:12:02.078   count = 2

13:12:02.088   count = 2

13:12:02.098   count = 2

13:12:02.119   count = 2

thanks in advance for some clarity in this…  daveC

#12

I meant to say, I don’t see how that code can’t work, increment the var count, no matter what programming language is used…

#13

What happened here guys?
I’m confused.

#14

Let me step in for a second. @dodi_games, it appears that @davidjcantera has posted an unrelated question/topic to your thread instead of posting to a new thread, or perhaps he was intending on replying to a different thread and accidentally posted in your thread. In Forum “lingo” this is called “Hijacking a thread” and is against the rules because it does cause confusion.  @davidjcantera, it would be helpful if you posted your question either in a new thread or if you were replying to a different thread, restate  your post there. I know you want answers and people are not going to be looking in this thread to talk about scope/tableview questions.

@dodi_games, back you the issue at hand. When you capture a new photo, we have to give it a unique name, which is why your photo number is increasing.  

If I were you, I would implement LFS and get a listing of all the files in the directory and then you can use os.remove() to remove them once you know their names. The first example in the LFS docs “Traverse a Directory” basically is the code you need. The example only prints out the file name, but you could do an 

os.remove( file )

where the print is. Now as a safety, there may be files there you don’t want to delete, so you might want to use a string.* API to try and match a pattern like Picture*.jpg. There are many different way’s to use different string.* API’s to match the string.

Rob

#15

What don’t you understand?

#16

Hi! The photo is not deleted. I still have a file named PictureX, (X = 1,2,3,4,5,etc)
every time I take a photo.

#17

I want to delete the “PictureX” file when the user leaves the scene using the back button and when the user touch the camera button to take a new photo.

#18

Can anyone teach me how to do this?

I’m using the Corona sample “camera” to make my camera button works.
I read the “lfs” tutorial and to be honest I do not understand it.

Do I need to requiere “lfs” in my scene?

I don’t know which directory the Corona sample “camera” developers use to store the taken photos.

Do I need to write my own code to do this?

Do I need to make a “path folder” to store all the taken photos?

Thanks in advance.

#19

I’m not asking anyone to write this part for me, I want to do it myself, to understand it myself, just ask for a start, something that can clarify the question of how to do this.

#20

Please post your code here so I can take a look.

I believe by default, your photo goes to the system temporary folder (system.TemporaryDirectory) and not to the Documents folder (system.DocumentsDirectory). unless you have used some function to move the file.