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negative values for char

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  • M micutzu

    Hello, I have the following situation: Input is char *buf (which is the content of a web page). I have the following code char v; for (i=0; i I get a negative v if the page has Greek characters I get negative values for v. Something like v=-50. Is there any method to get the character behind -50 ? Thanks.

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    Nemanja Trifunovic
    wrote on last edited by
    #5

    If you just want char to be unsigned, set the compiler option /J.


    Programming Blog utf8-cpp

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    • M micutzu

      Thanks for the reply. The whole application is developed around ANSI and changing everyting looks like not such a good idea. I was wandering if there is any mechanism to determine the “real character” behind -50. If I know that the real character is a greek character I can convert it into a html entity for example and I can get something like %u03C.

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      Naveen
      wrote on last edited by
      #6

      I dont know you checked my post or not...but this will work..isnt it? CString cstext = L"03C5"; wchar_t Greek; int nChar; swscanf( cstext, L"%x", &nChar ); Greek = nChar;

      nave

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      • N Naveen

        I dont know you checked my post or not...but this will work..isnt it? CString cstext = L"03C5"; wchar_t Greek; int nChar; swscanf( cstext, L"%x", &nChar ); Greek = nChar;

        nave

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        M Offline
        micutzu
        wrote on last edited by
        #7

        I did . Thanks. I do not use CString (not using MFC). Your solution works but I am trying to find a way to determine if there is a possible to find our which Greek character is assigned to -50 (if there is such a possibility).

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        • N Naveen

          I dont know you checked my post or not...but this will work..isnt it? CString cstext = L"03C5"; wchar_t Greek; int nChar; swscanf( cstext, L"%x", &nChar ); Greek = nChar;

          nave

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          toxcct
          wrote on last edited by
          #8

          Naveen R wrote:

          CString cstext = L"03C5";

          naveen, be careful, write this :

          CStringW cstext = L"03C5";

          or

          CString cstext = _T("03C5");

          but don't mix the two styles. apparently, you're using wide characters in all the rest of your code, so i'd say use the former...


          [VisualCalc][Flags Beginner's Guide] | [Forums Guidelines][My Best Advice]

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          • M micutzu

            I did . Thanks. I do not use CString (not using MFC). Your solution works but I am trying to find a way to determine if there is a possible to find our which Greek character is assigned to -50 (if there is such a possibility).

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            Naveen
            wrote on last edited by
            #9

            why cant you try printing it out to console..? wprintf( L"%c", pGreek );

            nave

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            • T toxcct

              Naveen R wrote:

              CString cstext = L"03C5";

              naveen, be careful, write this :

              CStringW cstext = L"03C5";

              or

              CString cstext = _T("03C5");

              but don't mix the two styles. apparently, you're using wide characters in all the rest of your code, so i'd say use the former...


              [VisualCalc][Flags Beginner's Guide] | [Forums Guidelines][My Best Advice]

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              Naveen
              wrote on last edited by
              #10

              but CString have both constructors CString(LPCWSTR lpsz) CString(LPCSTR lpsz) Any way I did so because he said( in his previous post) his project is UNICODE define...

              nave

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              • N Naveen

                but CString have both constructors CString(LPCWSTR lpsz) CString(LPCSTR lpsz) Any way I did so because he said( in his previous post) his project is UNICODE define...

                nave

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                toxcct
                wrote on last edited by
                #11

                Naveen R wrote:

                but CString have both constructors

                this is not acceptable argument, because, if the application is not defining UNICODE macro, even if you initialize your CString with a LPCWSTR, the string will be casted into ANSI string. BTW, i doubt of this information. actually, CString gets a LPCTSTR, which is transformed into LPCSTR or LPCWSTR depending on unicode definition

                Naveen R wrote:

                Any way I did so because he said( in his previous post) his project is UNICODE define...

                yes, but then prefer using CStringW. imagine the case when someone else has to maintain the application, or develop the dual possibility of having the application running both ansi and unicode... your code must be flexible, not only "aware"


                [VisualCalc][Flags Beginner's Guide] | [Forums Guidelines][My Best Advice]

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                • N Naveen

                  why cant you try printing it out to console..? wprintf( L"%c", pGreek );

                  nave

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                  micutzu
                  wrote on last edited by
                  #12

                  I did. printf("%c\n", c); wprintf( L"%c", c ); Both print the same character which is not the correct one ┼ (this is printed instead of Π)

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                  • M micutzu

                    I did . Thanks. I do not use CString (not using MFC). Your solution works but I am trying to find a way to determine if there is a possible to find our which Greek character is assigned to -50 (if there is such a possibility).

                    N Offline
                    N Offline
                    Nemanja Trifunovic
                    wrote on last edited by
                    #13

                    micutzu wrote:

                    but I am trying to find a way to determine if there is a possible to find our which Greek character is assigned to -50 (if there is such a possibility).

                    That entirely depends on the text encoding. Which charset is the webpage you are working with? If it is Windows CP 1253 (Greek), you can find out by setting the codepage of your console window to 1253 and then printing it out. For -50 (ie 206 in unsigned form) it should be greek capital XI: Ξ


                    Programming Blog utf8-cpp

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                    • T toxcct

                      Naveen R wrote:

                      but CString have both constructors

                      this is not acceptable argument, because, if the application is not defining UNICODE macro, even if you initialize your CString with a LPCWSTR, the string will be casted into ANSI string. BTW, i doubt of this information. actually, CString gets a LPCTSTR, which is transformed into LPCSTR or LPCWSTR depending on unicode definition

                      Naveen R wrote:

                      Any way I did so because he said( in his previous post) his project is UNICODE define...

                      yes, but then prefer using CStringW. imagine the case when someone else has to maintain the application, or develop the dual possibility of having the application running both ansi and unicode... your code must be flexible, not only "aware"


                      [VisualCalc][Flags Beginner's Guide] | [Forums Guidelines][My Best Advice]

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                      Naveen
                      wrote on last edited by
                      #14

                      toxcct wrote:

                      if the application is not defining UNICODE macro, even if you initialize your CString with a LPCWSTR, the string will be casted into ANSI string.

                      Even if UNICODE is defined, I am expecting only ANSI characters in that statement.

                      toxcct wrote:

                      yes, but then prefer using CStringW

                      Whats is this CStringW? I didnt find any such class in vc6. I havent worked in later verions of visual studio. Is it a new class added to the MFC in later verions of visual studio?

                      nave

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                      • M micutzu

                        I did. printf("%c\n", c); wprintf( L"%c", c ); Both print the same character which is not the correct one ┼ (this is printed instead of Π)

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                        Naveen
                        wrote on last edited by
                        #15

                        micutzu wrote:

                        wprintf( L"%c", c );

                        if 'c' is of type wchar_t then you must specify like this. wprintf( L"%c", &c );

                        nave

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