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Conver QString to char

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  • Q Offline
    Q Offline
    Q139
    wrote on last edited by Q139
    #3

    What is the advantage compared to: toStdString().c_str(); ?

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    • Q Q139

      What is the advantage compared to: toStdString().c_str(); ?

      J Offline
      J Offline
      Jeronimo
      wrote on last edited by
      #4

      @Q139 toStdString().c_str(); Where i put the QString here xD

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      • J Offline
        J Offline
        Jeronimo
        wrote on last edited by
        #5

        i'm trying with char not char *something

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        • Q Offline
          Q Offline
          Q139
          wrote on last edited by Q139
          #6

          Char only hold 1 character, to hold more need multiple
          QString qstr;
          qstr.toStdString().c_str();

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #7

            Sorry, so used to the char * use case that I didn't thought about that one.

            So something like char myChar = myString[0].toLatin1() ?

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

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            • SGaistS SGaist

              Sorry, so used to the char * use case that I didn't thought about that one.

              So something like char myChar = myString[0].toLatin1() ?

              J Offline
              J Offline
              Jeronimo
              wrote on last edited by
              #8

              @SGaist thx a lot for your help. it's possible to convert char for utf16??

              Paul ColbyP 1 Reply Last reply
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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #9

                Not directly, utf-16 is at least 2 bytes, char is 1.

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

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                • SGaistS SGaist

                  Not directly, utf-16 is at least 2 bytes, char is 1.

                  J Offline
                  J Offline
                  Jeronimo
                  wrote on last edited by
                  #10

                  @SGaist Ok so for example i dont want put char like utf16 but do the conversion for example in my if(conver UTF16(char)) it's possible? thx a lot!

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                  • J Jeronimo

                    @SGaist thx a lot for your help. it's possible to convert char for utf16??

                    Paul ColbyP Offline
                    Paul ColbyP Offline
                    Paul Colby
                    wrote on last edited by Paul Colby
                    #11

                    @Jeronimo said in Conver QString to char:

                    @SGaist thx a lot for your help. it's possible to convert char for utf16??

                    As @SGaist said, not with char. You'd need to use a wide char instead, such as:

                    wchar_t myChar = myString[0].unicode();
                    

                    However, wchar_t is compiler / platform dependant, and not portable when used in this way.

                    What would you want to pass the UTF-16 character on to? QChar::unicode() would probably work for that case.

                    Cheers.

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                    • Paul ColbyP Paul Colby

                      @Jeronimo said in Conver QString to char:

                      @SGaist thx a lot for your help. it's possible to convert char for utf16??

                      As @SGaist said, not with char. You'd need to use a wide char instead, such as:

                      wchar_t myChar = myString[0].unicode();
                      

                      However, wchar_t is compiler / platform dependant, and not portable when used in this way.

                      What would you want to pass the UTF-16 character on to? QChar::unicode() would probably work for that case.

                      Cheers.

                      J Offline
                      J Offline
                      Jeronimo
                      wrote on last edited by Jeronimo
                      #12

                      @Paul-Colby said in Conver QString to char:

                      QChar::unicode()

                      solved i prefer this method:

                      QString cadena = "Hola";
                      std::string cadenaStd = cadena.toStdString();
                      QChar c = cadenaStd[0] or char

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

                        Why not use QChar c = cadena[0] ?

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

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