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Get QString data from the QPixmap

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #5

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

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

    Cobra91151C 1 Reply Last reply
    0
    • SGaistS SGaist

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

      Cobra91151C Offline
      Cobra91151C Offline
      Cobra91151
      wrote on last edited by Cobra91151
      #6

      @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
      
      1 Reply Last reply
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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #7

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

        Where do you get that gif from ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        Cobra91151C 1 Reply Last reply
        0
        • SGaistS SGaist

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

          Where do you get that gif from ?

          Cobra91151C Offline
          Cobra91151C Offline
          Cobra91151
          wrote on last edited by Cobra91151
          #8

          @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.

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #9

            What are you using to generate that captcha ?

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            Cobra91151C 1 Reply Last reply
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            • SGaistS SGaist

              What are you using to generate that captcha ?

              Cobra91151C Offline
              Cobra91151C Offline
              Cobra91151
              wrote on last edited by Cobra91151
              #10

              @SGaist

              I generate it by PHP code.

              Image:
              0_1519938262803_2018-03-01_230403.png

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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #11

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

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                Cobra91151C 1 Reply Last reply
                0
                • SGaistS SGaist

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

                  Cobra91151C Offline
                  Cobra91151C Offline
                  Cobra91151
                  wrote on last edited by
                  #12

                  @SGaist

                  Yes.

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

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

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                    Cobra91151C 2 Replies Last reply
                    1
                    • SGaistS SGaist

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

                      Cobra91151C Offline
                      Cobra91151C Offline
                      Cobra91151
                      wrote on last edited by
                      #14

                      @SGaist

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

                      1 Reply Last reply
                      0
                      • SGaistS SGaist

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

                        Cobra91151C Offline
                        Cobra91151C Offline
                        Cobra91151
                        wrote on last edited by
                        #15

                        @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.

                        1 Reply Last reply
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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #16

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

                          Interested in AI ? www.idiap.ch
                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                          1 Reply Last reply
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