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How to run a C++ code in Qt?

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  • S SGaist
    19 Feb 2016, 22:40

    I'm going to repeat myself but: why not just start from a clean Qt project, copy the code you need to run over in that project and go on ?

    You have some core logic in that visual studio project but rather than just take the current working code and move it over to your Qt project with maybe some adaptations, you are trying to grab every bits of that project and mix it with your Qt project when there's no real need.

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    Rela
    wrote on 22 Feb 2016, 10:07 last edited by
    #101

    @SGaist
    I almost did the same, except I added the files "stdafx.h", "targetver.h", "stdafx.cpp", and "O_PS .H", which I think are needed. Because in this C++ code, only the "O_PSA .H" and "O_PS .CPP" include code.
    The content of "stdafx.h" is #include```

     "targetver.h"
    #include <stdio.h>
    #include <tchar.h>
    

    The content of "targetver.h" is ```

    #include <SDKDDKVer.h>
    

    The content of "stdafx.cpp" is ```

    #include "stdafx.h"
    

    And the content of "po .cpp" is ```

    #include "stdafx.h"
    

    But, if you mean I just copy the "O_PSA .H" and "O_PS .CPP" codes in "mainwindow.h" and "main.cpp", (here is the Qt project it gives many errors, and I think because all cpp and header files are necessary.

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    • S Offline
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      SGaist
      Lifetime Qt Champion
      wrote on 22 Feb 2016, 11:08 last edited by
      #102

      You have to fix the includes in your O_PS* files so add the missing #include <stdio.h>

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

      R 1 Reply Last reply 22 Feb 2016, 11:34
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      • S SGaist
        22 Feb 2016, 11:08

        You have to fix the includes in your O_PS* files so add the missing #include <stdio.h>

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        Rela
        wrote on 22 Feb 2016, 11:34 last edited by
        #103

        @SGaist
        Do I add #include <stdio.h> to "mainwindow.h" ? I added to all files one by one , but the same errors happen.
        Do I need to add #include "stdafx.h" or something else also?

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        • S Offline
          S Offline
          SGaist
          Lifetime Qt Champion
          wrote on 22 Feb 2016, 20:18 last edited by
          #104

          No, include them in your O_PS* files where suited.

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

          R 1 Reply Last reply 23 Feb 2016, 08:21
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          • S SGaist
            22 Feb 2016, 20:18

            No, include them in your O_PS* files where suited.

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            Rela
            wrote on 23 Feb 2016, 08:21 last edited by Rela
            #105

            @SGaist
            I copied the "O_PSA .H" and "O_PS .CPP" code in the "mainwindow.h" and "main.cpp" of the Qt project respevtively. I did add ```

            #include <stdio.h> 
            

            in either "mainwindow.h" or "main.cpp" files, but it gave the same errors

            K 1 Reply Last reply 23 Feb 2016, 08:36
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            • R Rela
              23 Feb 2016, 08:21

              @SGaist
              I copied the "O_PSA .H" and "O_PS .CPP" code in the "mainwindow.h" and "main.cpp" of the Qt project respevtively. I did add ```

              #include <stdio.h> 
              

              in either "mainwindow.h" or "main.cpp" files, but it gave the same errors

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              kshegunov
              Moderators
              wrote on 23 Feb 2016, 08:36 last edited by kshegunov
              #106

              @Rela
              It must have taken you ages to delete those names ... Anyway, to use ostream, istream and other streams from the standard C++ library, you actually need to include the corresponding headers - stdio.h simply won't cut it. You need (depending on which classes you use) one of the *stream headers, e.g. #include <iostream>, #include <fstream> and so on. Additionally, these classes come in the std namespace so you'd need to expand that as well, for example.

              #include <iostream>
              
              using namespace std;
              
              // Only now the istream and ostream classes are available.
              

              Kind regards.

              Read and abide by the Qt Code of Conduct

              R 1 Reply Last reply 23 Feb 2016, 10:19
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              • K kshegunov
                23 Feb 2016, 08:36

                @Rela
                It must have taken you ages to delete those names ... Anyway, to use ostream, istream and other streams from the standard C++ library, you actually need to include the corresponding headers - stdio.h simply won't cut it. You need (depending on which classes you use) one of the *stream headers, e.g. #include <iostream>, #include <fstream> and so on. Additionally, these classes come in the std namespace so you'd need to expand that as well, for example.

                #include <iostream>
                
                using namespace std;
                
                // Only now the istream and ostream classes are available.
                

                Kind regards.

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                Rela
                wrote on 23 Feb 2016, 10:19 last edited by Rela
                #107

                @kshegunov
                There are

                using namespace std;
                #include <iostream>
                #include <fstream>
                #include <ostream>
                

                in the "main.cpp" already. I added ```

                #include <stdio.h>
                

                in each file, but it gave the same error.

                K 1 Reply Last reply 23 Feb 2016, 10:25
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                • R Rela
                  23 Feb 2016, 10:19

                  @kshegunov
                  There are

                  using namespace std;
                  #include <iostream>
                  #include <fstream>
                  #include <ostream>
                  

                  in the "main.cpp" already. I added ```

                  #include <stdio.h>
                  

                  in each file, but it gave the same error.

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                  kshegunov
                  Moderators
                  wrote on 23 Feb 2016, 10:25 last edited by kshegunov
                  #108

                  @Rela said:

                  There are ... in the "main.cpp" already.

                  But obviously these headers are not present in mainwindow.h, whence the compile errors. The compiler doesn't know heck about ostream when processing the mainwindow.h and it's whining ...

                  Kind regards.

                  Read and abide by the Qt Code of Conduct

                  R 1 Reply Last reply 23 Feb 2016, 12:12
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                  • K kshegunov
                    23 Feb 2016, 10:25

                    @Rela said:

                    There are ... in the "main.cpp" already.

                    But obviously these headers are not present in mainwindow.h, whence the compile errors. The compiler doesn't know heck about ostream when processing the mainwindow.h and it's whining ...

                    Kind regards.

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                    Rela
                    wrote on 23 Feb 2016, 12:12 last edited by
                    #109

                    @kshegunov
                    Thanks. Do you know what else I can do except adding ```

                    #include <stdio.h>
                    

                    to the "mainwindow.h"?

                    K 1 Reply Last reply 23 Feb 2016, 12:16
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                    • R Rela
                      23 Feb 2016, 12:12

                      @kshegunov
                      Thanks. Do you know what else I can do except adding ```

                      #include <stdio.h>
                      

                      to the "mainwindow.h"?

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                      kshegunov
                      Moderators
                      wrote on 23 Feb 2016, 12:16 last edited by
                      #110

                      @Rela

                      Add the aforementioned headers to the mainwindow.h:

                      #include <iostream>
                      #include <fstream>
                      #include <ostream>
                      
                      using namespace std;
                      

                      Otherwise the compiler will not know what ostream is.

                      Read and abide by the Qt Code of Conduct

                      R 1 Reply Last reply 23 Feb 2016, 12:48
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                      • K kshegunov
                        23 Feb 2016, 12:16

                        @Rela

                        Add the aforementioned headers to the mainwindow.h:

                        #include <iostream>
                        #include <fstream>
                        #include <ostream>
                        
                        using namespace std;
                        

                        Otherwise the compiler will not know what ostream is.

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                        Rela
                        wrote on 23 Feb 2016, 12:48 last edited by
                        #111

                        @kshegunov
                        Done, but here are the errors cleaned again ;)

                        K 1 Reply Last reply 23 Feb 2016, 12:57
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                        • R Rela
                          23 Feb 2016, 12:48

                          @kshegunov
                          Done, but here are the errors cleaned again ;)

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                          kshegunov
                          Moderators
                          wrote on 23 Feb 2016, 12:57 last edited by
                          #112

                          @Rela
                          I'm sorry but I have no idea what's happening, with the deletions and without a complete code snippet this is just turning into a guessing game. Not to mention the preprocessor directives, whose expansions I have no way of deducing. The errors have obviously changed and they are at compile-time, so focus on that and try to resolve the type mismatches.

                          Read and abide by the Qt Code of Conduct

                          R 1 Reply Last reply 23 Feb 2016, 13:31
                          0
                          • K kshegunov
                            23 Feb 2016, 12:57

                            @Rela
                            I'm sorry but I have no idea what's happening, with the deletions and without a complete code snippet this is just turning into a guessing game. Not to mention the preprocessor directives, whose expansions I have no way of deducing. The errors have obviously changed and they are at compile-time, so focus on that and try to resolve the type mismatches.

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                            Rela
                            wrote on 23 Feb 2016, 13:31 last edited by
                            #113

                            @kshegunov
                            The problem is not related to the code. The C++ code works properly in MV and also it worked in Qt creator before and gave the results in "Application Outputs" with Qt5.5 and MV 2013. The problem happened, when I start working with MV 2015 and Qt5.6 beta.
                            I just did the previous way and added all C++ files to the Qt project files. Do you have any idea about the ```

                            error: dependent '..\C++' does not exist.
                            
                            K 1 Reply Last reply 23 Feb 2016, 13:41
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                            • R Rela
                              23 Feb 2016, 13:31

                              @kshegunov
                              The problem is not related to the code. The C++ code works properly in MV and also it worked in Qt creator before and gave the results in "Application Outputs" with Qt5.5 and MV 2013. The problem happened, when I start working with MV 2015 and Qt5.6 beta.
                              I just did the previous way and added all C++ files to the Qt project files. Do you have any idea about the ```

                              error: dependent '..\C++' does not exist.
                              
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                              kshegunov
                              Moderators
                              wrote on 23 Feb 2016, 13:41 last edited by
                              #114

                              @Rela
                              I have never seen that error, but if I had to guess probably a folder can't be found by qmake. Inspect your project file, and make sure all folders/files exist. Then rerun qmake and then do a full rebuild. Additionally, don't use backslashes for your paths when working with qmake, use *nix-style paths, for example: C:/somefolder/somefile.cpp

                              Read and abide by the Qt Code of Conduct

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                              • S Offline
                                S Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on 23 Feb 2016, 20:41 last edited by
                                #115

                                Do you have something containing "C++" anywhere in your .pro file ?

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

                                R 1 Reply Last reply 24 Feb 2016, 13:51
                                0
                                • S SGaist
                                  23 Feb 2016, 20:41

                                  Do you have something containing "C++" anywhere in your .pro file ?

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                                  Rela
                                  wrote on 24 Feb 2016, 13:51 last edited by
                                  #116

                                  @SGaist
                                  Yes, I had something like this in PS8, because I added the C++ project header and source files through the "../C++ projects/po... /" path. But, now I removed the space of "C++ projects" (because maybe it makes problem), and changed the path withoutspace. PS10 Qt project .pro file is this
                                  Now the error is this

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                                    jsulm
                                    Lifetime Qt Champion
                                    wrote on 25 Feb 2016, 06:37 last edited by
                                    #117

                                    What is char.h?

                                    https://forum.qt.io/topic/113070/qt-code-of-conduct

                                    R 1 Reply Last reply 25 Feb 2016, 11:15
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                                    • J jsulm
                                      25 Feb 2016, 06:37

                                      What is char.h?

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                                      Rela
                                      wrote on 25 Feb 2016, 11:15 last edited by Rela
                                      #118

                                      @jsulm
                                      It was

                                      #include <tchar.h>
                                      

                                      in the C++ code, but it had given the errors like

                                      'void PS... (char *)': cannot convert argument 1 from 'const char [37]' to 'char *'
                                      

                                      and I changed it to "char".
                                      I think its related to the main function in "main.cpp"

                                      int main(int argc, char* argv[])
                                      {
                                      
                                      K 1 Reply Last reply 25 Feb 2016, 12:10
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                                      • J Offline
                                        J Offline
                                        jsulm
                                        Lifetime Qt Champion
                                        wrote on 25 Feb 2016, 11:47 last edited by
                                        #119

                                        How is it related to main?
                                        char is a native data type in C and C++, you do not have to include any header file to use it. So just remove this include.
                                        This error:

                                        'void PS... (char *)': cannot convert argument 1 from 'const char [37]' to 'char *'
                                        

                                        You got probably because you're passing a const char string as parameter to a function which expects a non const char string:

                                        void PS... (char *param);
                                        then you call
                                        PS...("a string");
                                        

                                        Do it like this:

                                        char *param = "a string";
                                        PS...(param);
                                        

                                        https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                        • R Rela
                                          25 Feb 2016, 11:15

                                          @jsulm
                                          It was

                                          #include <tchar.h>
                                          

                                          in the C++ code, but it had given the errors like

                                          'void PS... (char *)': cannot convert argument 1 from 'const char [37]' to 'char *'
                                          

                                          and I changed it to "char".
                                          I think its related to the main function in "main.cpp"

                                          int main(int argc, char* argv[])
                                          {
                                          
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                                          kshegunov
                                          Moderators
                                          wrote on 25 Feb 2016, 12:10 last edited by
                                          #120

                                          @Rela

                                          'void PS... (char *)': cannot convert argument 1 from 'const char [37]' to 'char *'

                                          The error is because you're passing const char * const to a function expecting char * and the compiler doesn't know how to (safely) convert the argument. My advice is: rework your function to accept non-mutable arguments if possible, if not - fix the type mismatch. @jsulm already pointed out that you shouldn't include headers you're not going to need, unless massive compilation times is something you're after.

                                          Kind regards.

                                          Read and abide by the Qt Code of Conduct

                                          1 Reply Last reply
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