loadImage then delete file?

Programming Questions

sbright33

in Programming Questions • 1 year ago

First time poster, long time programmer.
loadImage works great! I want to delete the file when I'm done. How?
This code works if these 2 files exist in my Sketch folder:

import java.io.File;
PImage img;

void setup(){
img = loadImage("t2.jpg");
//img.save("t3.jpg");
//img.loadPixels();
//img.updatePixels();
String fn=sketchPath("t3.jpg");
File ddf=sketchFile(fn);
if(ddf.exists()){
println(ddf.delete());
}
else {
print("NotExist ");
println(fn);
}

}
void draw(){
}

But try changing t3 -> t2.jpg.
The file is still open?
How do I close it?
It can not delete it.
Why not?
How can I?
I feel that I've tried everything.
Please help!

I've noticed I can delete it from Windows Vista while a different Sketch is running trying to delete it.

Replies(5)

sbright33

Re: loadImage then delete file?

1 year ago

import java.io.File;

void setup(){
//img.save("t3.jpg");
//img.loadPixels();
//img.updatePixels();
}
void draw(){
localimg();
delay(10000);
String fn=sketchPath("t2.jpg");
File ddf=sketchFile(fn);
if(ddf.exists()){
println(ddf.delete());
}
else {
print("NotExist ");
println(fn);
}
}
void localimg(){
PImage img;
img = loadImage("t2.jpg");
}

Also tried above. Prints false.

amnon.owed

Re: loadImage then delete file?

1 year ago

When there's something strange in your neighborhood who you gonna call? GARBAGE COLLECTOR!

Code Example

PImage img;
void setup() {
img = loadImage("image.jpg");
size(img.width, img.height);
image(img, 0, 0);
String fileName = sketchPath("image.jpg");
File file = sketchFile(fileName);
if (file.exists()) { println("The file exists"); }
System.gc(); // the key to succes
boolean succes = file.delete();
if (succes) { println("The file was deleted"); }
if (!file.exists()) { println("The file no longer exists"); }
}

sbright33

Re: loadImage then delete file?

1 year ago

You're a genius! I would have wasted Forever trying to figure this out!
(I don't give up easily)
If I get stuck I know who to ask...

I'm making an IR laser tracking camera running on Arduino but sending video to PC.
Thanks to you the first version is Done and tested!
Steve

silicaroa..

Re: loadImage then delete file?

1 year ago

A slightly modified version of the code showed the path to be different from what I expected. When I ran the following:

import java.io.File;
PImage img;

void setup() {
img = loadImage("image.jpg");
size(img.width, img.height);
image(img, 0, 0);
String fileName = sketchPath("image.jpg");
println(fileName);
File file = sketchFile(fileName);
if (file.exists()) { println("The file exists"); }
System.gc(); // the key to succes
boolean succes = file.delete();
if (succes) { println("The file was deleted"); }
if (!file.exists()) {println("The file no longer exists"); }
}

First run, it works as expected. I ran it a second time with no file (it had been deleted), and yet the sketch displayed the image, a path to where the file used to be, and correctly printed that the file no longer exists. I closed Processing, opened it, and ran the sketch again with no file in existence. Still the sketch displayed the image, the path it used to have, and that the file no longer exists.

My interest is understanding what is happening; how is Processing finding and displaying an image that no longer exists?

andrewgie..

Re: loadImage then delete file?

1 year ago

Twilight Zone......Haha......Does Processing have some sort of memory repository of files that it has opened.....Or is the file not really deleted?

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