How to display a captured image?

Getting Started Newbie Questions
#1

Hello,

 I am capturing an image into the system.DocumentsDirectory then I am trying to display it by using:

local capturedImage = display.newImageRect( sceneGroup, "mycat.png", system.DocumentsDirectory, 401, 868 ) capturedImage.x, capturedImage.y = display.contentWidth \* 0.25, display.contentHeight \* 0.25

but I get the error:

ERROR: C:\Users\aaa\Documents\Corona Projects\capture\_image\scene1.lua:44: display.newImageRect() bad argument #1: filename or image sheet expected, but got nil 20:01:41.973 ERROR: Runtime error 20:01:41.973 C:\Users\aaa\Documents\Corona Projects\capture\_image\scene1.lua:45: attempt to index local 'capturedImage' (a nil value)

Capturing the image works because I can see the image in the Sandbox Documents folder. 

I spent a couple of days trying to figure it out but I couldn’t. Any help is highly appreciated.

I have attached a sample project that shows the problem.

Thanks.

#2

You forgot to attach the sample project.

If you are directly capturing some location and you then want to show it, you could alternatively just use https://docs.coronalabs.com/api/library/display/capture.html

#3

Sorry. I thought I did attach it. 

Hopefully file now attached.

Capturing and saving works. It’s retrieving the captured image that doesn’t work.

#4

It’s crashing because of  sceneGroup.

sceneGroup is local to each of your scene functions, but your showImage function is outside of them and thus it doesn’t have a reference to it. You have several ways to fix this. You could create a display group outside of the scene functions (definitely the easiest and the cleanest, especially if you are using groups).

Alternatively you could create a variable called “groupRef” outside of the scene functions (e.g. on row 10 or so) and then assign groupRef = sceneGroup on row 33 and then just pass groupRef as an argument into your showImage function instead of sceneGroup.

#5

Thanks @XeduR

Well spotted. 

#6

You forgot to attach the sample project.

If you are directly capturing some location and you then want to show it, you could alternatively just use https://docs.coronalabs.com/api/library/display/capture.html

#7

Sorry. I thought I did attach it. 

Hopefully file now attached.

Capturing and saving works. It’s retrieving the captured image that doesn’t work.

#8

It’s crashing because of  sceneGroup.

sceneGroup is local to each of your scene functions, but your showImage function is outside of them and thus it doesn’t have a reference to it. You have several ways to fix this. You could create a display group outside of the scene functions (definitely the easiest and the cleanest, especially if you are using groups).

Alternatively you could create a variable called “groupRef” outside of the scene functions (e.g. on row 10 or so) and then assign groupRef = sceneGroup on row 33 and then just pass groupRef as an argument into your showImage function instead of sceneGroup.

#9

Thanks @XeduR

Well spotted.