Get QString data from the QPixmap

[Cobra91151]

@SGaist

I have checked your solution, but how to translate those bits to QString or something to compare with the user input. I have tried different solutions but it failed. Thanks.

[SGaist]

Do you mean you want to extract the text the user has input stored in the gif ?

[Cobra91151]

@SGaist

No, I want extract it to compare with user input from QLineEdit text function.

So for example, the captcha code: ABCD.
User input: ABCD.
So I can compare it as text or some hash to validate if it matches.

qDebug() << data.bits(); // it returns 0xa1ff200

[SGaist]

QImage::bits gives you the starting address of the raw image data.

Where do you get that gif from ?

[Cobra91151]

@SGaist

I parse it from my website.

Here is the some PHP code:

$_SESSION["image"] = implode('', $cod);  // gets code captcha
header("Content-type: image/gif"); 		//loads the captcha image
imagegif($src); 
imagedestroy($src);

I need this - $_SESSION["image"] = implode('', $cod); to be parsed so I can compare later with user input.
I use $_SESSION["image"] to validate captcha code on the website. So I need to parse it to the application but since the header content type is the image, I can't access the captcha code.

Another solution is to use this project from GitHub:
QtCaptcha

Also I can port PHP captcha generation to the C++ but it will take long.

[SGaist]

What are you using to generate that captcha ?

[Cobra91151]

@SGaist

I generate it by PHP code.

Image:

[SGaist]

So basically, you want to decipher the captcha image you generate client side to check whether the use input is correct ?

[Cobra91151]

@SGaist

Yes.

[SGaist]

You do realise that the goal of the captcha is to make it really difficult for computer to deduce what's on it ?

[Cobra91151]

@SGaist

Yes, I know it. I think I have the idea how to decipher it. I will try it and reply.

[Cobra91151]

@SGaist

So my solution is:

I have stored $_SESSION["image"] value to the txt file witch is the captcha code. Then I read this file and now get the value to compare with the user input. Also I'm thinking about putting it to the database or restrict access to the file.

[SGaist]

By the way, why do it on the client side ?