Image Provider generates Empty captcha (Linux)

[alirezanet]

Image Provider generates Empty captcha (Linux)

[VahidN]

I will change the encryption part tomorrow. It seems a lot of ppl have problem with this part.

[alirezanet]

I will change the encryption part tomorrow. It seems a lot of ppl have problem with this part.

thanks. but I don't think the encryption part is wrong. a few hours ago I deleted my comments about encryption after I tested everything manually. in my opinion, the only part of this code that could cause this problem is the DrawCaptcha method. but maybe I'm wrong.

this image might help:

[VahidN]

Probably installing just libgdiplus is not enough. Try installing its required dependencies too:

    apt-get install libc6-dev libx11-dev
    apt-get install libgdiplus
    cd /usr/lib
    ln -s libgdiplus.so gdiplus.dll
    rm -rf /var/lib/apt/lists/*

[alirezanet]

Probably installing just libgdiplus is not enough. Try installing its required dependencies too:

    apt-get install libc6-dev libx11-dev
    apt-get install libgdiplus
    cd /usr/lib
    ln -s libgdiplus.so gdiplus.dll
    rm -rf /var/lib/apt/lists/*

unfortunately, nothing is changed after installing dependencies.

could be this issue related to fonts somehow?

[SajjadHosseinPour]

any update on this issue?
captcha did'nt show in 2.3.0 version for me
so i updated to 2.5.0 and after that nothing works.

[VahidN]

• There's a working sample here. give it a try. Also the readme file shows the latest changes.
• Plus you should be able to follow the logged errors (if any), in the console or debug window of your IDE.

[alirezanet]

what about the main issue?

I think there are three possibilities.

1. some other unknown dependencies are missing
2. this is a libgdiplus bug
3. this is a DntCaptcha bug

any thoughts?

[VahidN]

Do you see any errors/exceptions in the console or debug window of your .NET Core app? (the same as the posted image)

[alirezanet]

Do you see any errors/exceptions in the console or debug window of your .NET Core app? (the same as the posted image)

unfortunately not at all.

you can see a working live version on test.iranemp.ir. but in this specific environment, something is missing for sure

---

update:
I debugged this library there is no exception but I think DrawCaptcha in CaptchaImageProvider not working as expected.

[alirezanet]

any update on this issue?

[VahidN]

• No. I'm not using WSL/2 and I don't have any intention to even install it or try it.
• This is an open source project, feel free to move it forward.