pass unicode arguments to QApplication











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1
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I have windows console application which accepts unicode characters as argument



 wmain( int argc , wchar_t ** argv)


Now I want to pass the argv argument to my QApplication . However the QApplication accepts on char ** .



How do I manage to achieve this ?






c++ qt unicode







share|improve this question






















  • Either, you use main() instead or you "translate" wchar_ts to chars. I cannot imagine that QApplication expects command line arguments where non-ASCII values are relevant but actually I'm not sure. File paths would be the exception.
    – Scheff
    Nov 22 at 13:53










  • IIRC QApplication::arguments on Windows is already Unicode-aware. Write portable code, using int main(int argc, char**argv) and Qt will magically make it work.
    – MSalters
    Nov 22 at 14:29






  • 1




    according to this answer the constructor argumenrt are not used to construct QApplication::arguments(). So you could as well not bother.
    – max630
    Nov 25 at 8:38















up vote
1
down vote

favorite












I have windows console application which accepts unicode characters as argument



 wmain( int argc , wchar_t ** argv)


Now I want to pass the argv argument to my QApplication . However the QApplication accepts on char ** .



How do I manage to achieve this ?






c++ qt unicode







share|improve this question






















  • Either, you use main() instead or you "translate" wchar_ts to chars. I cannot imagine that QApplication expects command line arguments where non-ASCII values are relevant but actually I'm not sure. File paths would be the exception.
    – Scheff
    Nov 22 at 13:53










  • IIRC QApplication::arguments on Windows is already Unicode-aware. Write portable code, using int main(int argc, char**argv) and Qt will magically make it work.
    – MSalters
    Nov 22 at 14:29






  • 1




    according to this answer the constructor argumenrt are not used to construct QApplication::arguments(). So you could as well not bother.
    – max630
    Nov 25 at 8:38













up vote
1
down vote

favorite









up vote
1
down vote

favorite











I have windows console application which accepts unicode characters as argument



 wmain( int argc , wchar_t ** argv)


Now I want to pass the argv argument to my QApplication . However the QApplication accepts on char ** .



How do I manage to achieve this ?






c++ qt unicode







share|improve this question













I have windows console application which accepts unicode characters as argument



 wmain( int argc , wchar_t ** argv)


Now I want to pass the argv argument to my QApplication . However the QApplication accepts on char ** .



How do I manage to achieve this ?






c++ qt unicode




c++ qt unicode






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 22 at 13:49









sameer karjatkar

88531232




88531232












  • Either, you use main() instead or you "translate" wchar_ts to chars. I cannot imagine that QApplication expects command line arguments where non-ASCII values are relevant but actually I'm not sure. File paths would be the exception.
    – Scheff
    Nov 22 at 13:53










  • IIRC QApplication::arguments on Windows is already Unicode-aware. Write portable code, using int main(int argc, char**argv) and Qt will magically make it work.
    – MSalters
    Nov 22 at 14:29






  • 1




    according to this answer the constructor argumenrt are not used to construct QApplication::arguments(). So you could as well not bother.
    – max630
    Nov 25 at 8:38


















  • Either, you use main() instead or you "translate" wchar_ts to chars. I cannot imagine that QApplication expects command line arguments where non-ASCII values are relevant but actually I'm not sure. File paths would be the exception.
    – Scheff
    Nov 22 at 13:53










  • IIRC QApplication::arguments on Windows is already Unicode-aware. Write portable code, using int main(int argc, char**argv) and Qt will magically make it work.
    – MSalters
    Nov 22 at 14:29






  • 1




    according to this answer the constructor argumenrt are not used to construct QApplication::arguments(). So you could as well not bother.
    – max630
    Nov 25 at 8:38
















Either, you use main() instead or you "translate" wchar_ts to chars. I cannot imagine that QApplication expects command line arguments where non-ASCII values are relevant but actually I'm not sure. File paths would be the exception.
– Scheff
Nov 22 at 13:53




Either, you use main() instead or you "translate" wchar_ts to chars. I cannot imagine that QApplication expects command line arguments where non-ASCII values are relevant but actually I'm not sure. File paths would be the exception.
– Scheff
Nov 22 at 13:53












IIRC QApplication::arguments on Windows is already Unicode-aware. Write portable code, using int main(int argc, char**argv) and Qt will magically make it work.
– MSalters
Nov 22 at 14:29




IIRC QApplication::arguments on Windows is already Unicode-aware. Write portable code, using int main(int argc, char**argv) and Qt will magically make it work.
– MSalters
Nov 22 at 14:29




1




1




according to this answer the constructor argumenrt are not used to construct QApplication::arguments(). So you could as well not bother.
– max630
Nov 25 at 8:38




according to this answer the constructor argumenrt are not used to construct QApplication::arguments(). So you could as well not bother.
– max630
Nov 25 at 8:38












3 Answers
3






active

oldest

votes

















up vote
1
down vote













Until QTBUG-3200 is fixed, the only way to not be bounded by the "Current locale for non-Unicode" charset seem to convert the arguments to UTF-8, then 



QTextCodec::setCodecForLocale(QTextCodec::codecForName("utf-8"));

QApplication(argc, argv_converted);


I cannot verify currently that it would work, though.






share|improve this answer




























    up vote
    1
    down vote













    You don’t need to pass these arguments to QApplication constructor. You can pass a dummy array, since it’s not used on Windows. The C-style program argument passing via main arguments is not the Windows-native way of accessing arguments, and QApplication doesn’t use it. The wchar-based main is a kludge that attempts to distract from the fact that argv is not a native interface.



    This works:



    int argcc = 1;
    
char arg0[1] = "";
    
char *argvc[2] = {&arg0, nullptr};
    
QApplication app(argcc, argvc);





    share|improve this answer




























      up vote
      -1
      down vote













      Qt do not use wchar_t* for Unicode strings as usual. Only QString or char*. If you want to contvert QString -> char* (or char* -> QString) use QTextCodec.
      For example, older versions of Windows has encoding cp866 for console and if you want send unicode QString into command line:



      QString string = "Unicode text";
      
QTextCodec *codec = QTextCodec::codecForName("cp866");
      
QByteArray encodedString = codec->fromUnicode(string);
      
//encodedString.data() - char* representation of unicode QString


      For reading input parameters in main() convert like this:



      QTextCodec *codec = QTextCodec::codecForName("cp866");
      
QString strArg = codec->toUnicode(argv);





      share|improve this answer























      • I think you should mention QChar*, which is the direct Qt alternative to wchar_t*.
        – MSalters
        Nov 22 at 14:26






      • 1




        Also note that code page 866 is Cyrillic; it's the default on a very small number of PC's worldwide.
        – MSalters
        Nov 22 at 15:06











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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes








      up vote
      1
      down vote













      Until QTBUG-3200 is fixed, the only way to not be bounded by the "Current locale for non-Unicode" charset seem to convert the arguments to UTF-8, then 



      QTextCodec::setCodecForLocale(QTextCodec::codecForName("utf-8"));
      
QApplication(argc, argv_converted);


      I cannot verify currently that it would work, though.






      share|improve this answer

























        up vote
        1
        down vote













        Until QTBUG-3200 is fixed, the only way to not be bounded by the "Current locale for non-Unicode" charset seem to convert the arguments to UTF-8, then 



        QTextCodec::setCodecForLocale(QTextCodec::codecForName("utf-8"));
        
QApplication(argc, argv_converted);


        I cannot verify currently that it would work, though.






        share|improve this answer























          up vote
          1
          down vote










          up vote
          1
          down vote









          Until QTBUG-3200 is fixed, the only way to not be bounded by the "Current locale for non-Unicode" charset seem to convert the arguments to UTF-8, then 



          QTextCodec::setCodecForLocale(QTextCodec::codecForName("utf-8"));
          
QApplication(argc, argv_converted);


          I cannot verify currently that it would work, though.






          share|improve this answer












          Until QTBUG-3200 is fixed, the only way to not be bounded by the "Current locale for non-Unicode" charset seem to convert the arguments to UTF-8, then 



          QTextCodec::setCodecForLocale(QTextCodec::codecForName("utf-8"));
          
QApplication(argc, argv_converted);


          I cannot verify currently that it would work, though.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 25 at 8:31









          max630

          5,17111340




          5,17111340
























              up vote
              1
              down vote













              You don’t need to pass these arguments to QApplication constructor. You can pass a dummy array, since it’s not used on Windows. The C-style program argument passing via main arguments is not the Windows-native way of accessing arguments, and QApplication doesn’t use it. The wchar-based main is a kludge that attempts to distract from the fact that argv is not a native interface.



              This works:



              int argcc = 1;
              
char arg0[1] = "";
              
char *argvc[2] = {&arg0, nullptr};
              
QApplication app(argcc, argvc);





              share|improve this answer

























                up vote
                1
                down vote













                You don’t need to pass these arguments to QApplication constructor. You can pass a dummy array, since it’s not used on Windows. The C-style program argument passing via main arguments is not the Windows-native way of accessing arguments, and QApplication doesn’t use it. The wchar-based main is a kludge that attempts to distract from the fact that argv is not a native interface.



                This works:



                int argcc = 1;
                
char arg0[1] = "";
                
char *argvc[2] = {&arg0, nullptr};
                
QApplication app(argcc, argvc);





                share|improve this answer























                  up vote
                  1
                  down vote










                  up vote
                  1
                  down vote









                  You don’t need to pass these arguments to QApplication constructor. You can pass a dummy array, since it’s not used on Windows. The C-style program argument passing via main arguments is not the Windows-native way of accessing arguments, and QApplication doesn’t use it. The wchar-based main is a kludge that attempts to distract from the fact that argv is not a native interface.



                  This works:



                  int argcc = 1;
                  
char arg0[1] = "";
                  
char *argvc[2] = {&arg0, nullptr};
                  
QApplication app(argcc, argvc);





                  share|improve this answer












                  You don’t need to pass these arguments to QApplication constructor. You can pass a dummy array, since it’s not used on Windows. The C-style program argument passing via main arguments is not the Windows-native way of accessing arguments, and QApplication doesn’t use it. The wchar-based main is a kludge that attempts to distract from the fact that argv is not a native interface.



                  This works:



                  int argcc = 1;
                  
char arg0[1] = "";
                  
char *argvc[2] = {&arg0, nullptr};
                  
QApplication app(argcc, argvc);






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 25 at 8:47









                  Kuba Ober

                  69k982182




                  69k982182






















                      up vote
                      -1
                      down vote













                      Qt do not use wchar_t* for Unicode strings as usual. Only QString or char*. If you want to contvert QString -> char* (or char* -> QString) use QTextCodec.
                      For example, older versions of Windows has encoding cp866 for console and if you want send unicode QString into command line:



                      QString string = "Unicode text";
                      
QTextCodec *codec = QTextCodec::codecForName("cp866");
                      
QByteArray encodedString = codec->fromUnicode(string);
                      
//encodedString.data() - char* representation of unicode QString


                      For reading input parameters in main() convert like this:



                      QTextCodec *codec = QTextCodec::codecForName("cp866");
                      
QString strArg = codec->toUnicode(argv);





                      share|improve this answer























                      • I think you should mention QChar*, which is the direct Qt alternative to wchar_t*.
                        – MSalters
                        Nov 22 at 14:26






                      • 1




                        Also note that code page 866 is Cyrillic; it's the default on a very small number of PC's worldwide.
                        – MSalters
                        Nov 22 at 15:06















                      up vote
                      -1
                      down vote













                      Qt do not use wchar_t* for Unicode strings as usual. Only QString or char*. If you want to contvert QString -> char* (or char* -> QString) use QTextCodec.
                      For example, older versions of Windows has encoding cp866 for console and if you want send unicode QString into command line:



                      QString string = "Unicode text";
                      
QTextCodec *codec = QTextCodec::codecForName("cp866");
                      
QByteArray encodedString = codec->fromUnicode(string);
                      
//encodedString.data() - char* representation of unicode QString


                      For reading input parameters in main() convert like this:



                      QTextCodec *codec = QTextCodec::codecForName("cp866");
                      
QString strArg = codec->toUnicode(argv);





                      share|improve this answer























                      • I think you should mention QChar*, which is the direct Qt alternative to wchar_t*.
                        – MSalters
                        Nov 22 at 14:26






                      • 1




                        Also note that code page 866 is Cyrillic; it's the default on a very small number of PC's worldwide.
                        – MSalters
                        Nov 22 at 15:06













                      up vote
                      -1
                      down vote










                      up vote
                      -1
                      down vote









                      Qt do not use wchar_t* for Unicode strings as usual. Only QString or char*. If you want to contvert QString -> char* (or char* -> QString) use QTextCodec.
                      For example, older versions of Windows has encoding cp866 for console and if you want send unicode QString into command line:



                      QString string = "Unicode text";
                      
QTextCodec *codec = QTextCodec::codecForName("cp866");
                      
QByteArray encodedString = codec->fromUnicode(string);
                      
//encodedString.data() - char* representation of unicode QString


                      For reading input parameters in main() convert like this:



                      QTextCodec *codec = QTextCodec::codecForName("cp866");
                      
QString strArg = codec->toUnicode(argv);





                      share|improve this answer














                      Qt do not use wchar_t* for Unicode strings as usual. Only QString or char*. If you want to contvert QString -> char* (or char* -> QString) use QTextCodec.
                      For example, older versions of Windows has encoding cp866 for console and if you want send unicode QString into command line:



                      QString string = "Unicode text";
                      
QTextCodec *codec = QTextCodec::codecForName("cp866");
                      
QByteArray encodedString = codec->fromUnicode(string);
                      
//encodedString.data() - char* representation of unicode QString


                      For reading input parameters in main() convert like this:



                      QTextCodec *codec = QTextCodec::codecForName("cp866");
                      
QString strArg = codec->toUnicode(argv);






                      share|improve this answer














                      share|improve this answer



                      share|improve this answer








                      edited Nov 22 at 14:17

























                      answered Nov 22 at 14:12









                      Serhiy Kulish

                      923




                      923












                      • I think you should mention QChar*, which is the direct Qt alternative to wchar_t*.
                        – MSalters
                        Nov 22 at 14:26






                      • 1




                        Also note that code page 866 is Cyrillic; it's the default on a very small number of PC's worldwide.
                        – MSalters
                        Nov 22 at 15:06


















                      • I think you should mention QChar*, which is the direct Qt alternative to wchar_t*.
                        – MSalters
                        Nov 22 at 14:26






                      • 1




                        Also note that code page 866 is Cyrillic; it's the default on a very small number of PC's worldwide.
                        – MSalters
                        Nov 22 at 15:06
















                      I think you should mention QChar*, which is the direct Qt alternative to wchar_t*.
                      – MSalters
                      Nov 22 at 14:26




                      I think you should mention QChar*, which is the direct Qt alternative to wchar_t*.
                      – MSalters
                      Nov 22 at 14:26




                      1




                      1




                      Also note that code page 866 is Cyrillic; it's the default on a very small number of PC's worldwide.
                      – MSalters
                      Nov 22 at 15:06




                      Also note that code page 866 is Cyrillic; it's the default on a very small number of PC's worldwide.
                      – MSalters
                      Nov 22 at 15:06


















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