How to modify image previously used by picturebox?

Question

0.00/5 (No votes)

See more:

This is the code:

C#

//THIS FUNCTION IS CALLED WHEN I PRESS A BUTTON IN A WINFORM
pictureBox1.Image = Image.FromFile("E:/Projects/01/pics/loading.gif
string cmdCommand = "/C py E:/Projects/01/python/generate_image.py --dim 400"
Process.Start("CMD.exe", cmdCommand);
while (true)
{
  if (File.Exists(path)) //path is a string of where the python script saves the file
  {
    pictureBox1.Image = Image.FromFile(path);
    break;
  }
}

The python script uses pillow to generate a pattern and save it to the same location the variable path is assigned to. And it works but only once, then it stops working.

So i did it manually, i went into the C# application, started it up, generated the first pattern, then started the python script and it says permission denied.

I thought changing the pictureBox image would fix this? How do I dispose or stop using the image in my c# application so python can change it, so i then can load the new image.

What I have tried:

I have tried loading another image from file, but it did not work as I thought.

Posted 31-Dec-21 1:47am

CodeSie Programming

Updated 31-Dec-21 1:59am

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2021-12-31T01:59:00

If in doubt, read the documentation: Image.FromFile Method (System.Drawing) | Microsoft Docs[^]
Under "Remarks" it is explicitly stated:

MS Documentation:
The file remains locked until the Image is disposed.

WHat that means is that while the Image exists in your application, an exclusive lock is established on the file that you sourced the images data from - and no other application can open it.

To get round this, you need to read the image, copy it, and Dispose the original:

C#

Image youWanted;
using (Image image = Image.FromFile(file))
    {
    youWanted = new Bitmap(image)
    }

The using block will Dispose the image for you and release the file lock.