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  4. problem with fwrite

problem with fwrite

Scheduled Pinned Locked Moved C / C++ / MFC
helpdebugging
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  • C Cadimi

    when debuging, just watch for the file pointer, so, I can see fout increase the value, I write 1 or 2 HOTKEY to try, but the content no change. When I read the file, the value is 0 >.<

    CPalliniC Offline
    CPalliniC Offline
    CPallini
    wrote on last edited by
    #8

    Cadimi wrote:

    I write 1 or 2 HOTKEY to try

    But then do you close the file?

    If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
    This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

    In testa che avete, signor di Ceprano?

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    • CPalliniC CPallini

      Cadimi wrote:

      I write 1 or 2 HOTKEY to try

      But then do you close the file?

      If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
      This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

      C Offline
      C Offline
      Cadimi
      wrote on last edited by
      #9

      as you can see in the code, I closed it, and before closed it, I fflush( fout ) carefully :D

      CPalliniC 1 Reply Last reply
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      • C Cadimi

        as you can see in the code, I closed it, and before closed it, I fflush( fout ) carefully :D

        CPalliniC Offline
        CPalliniC Offline
        CPallini
        wrote on last edited by
        #10

        Yes, I saw the code, anyway I was referring to you debugging actions (i.e. I didn't know if you stopped the program after few write operations). The reason behind my questions is I cannot believe fwrite silently failing, it never happened to me. Can't you isolate the failing piece of the writing routine and run it in a simpler context (for instance another, adhoc, project)?

        If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
        This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

        In testa che avete, signor di Ceprano?

        C 1 Reply Last reply
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        • CPalliniC CPallini

          Yes, I saw the code, anyway I was referring to you debugging actions (i.e. I didn't know if you stopped the program after few write operations). The reason behind my questions is I cannot believe fwrite silently failing, it never happened to me. Can't you isolate the failing piece of the writing routine and run it in a simpler context (for instance another, adhoc, project)?

          If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
          This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

          C Offline
          C Offline
          Cadimi
          wrote on last edited by
          #11

          thanks for your help, that's the worse thing I've ever met >.<

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          • C Cadimi

            I wrote a short code to write the status of my program to a file, but when debug in that code, I realize that fwrite function still increase its file pointer but when I read that file by fread function, I can't read that value. This is my code: // TODO: Add your control notification handler code here //write config file FILE *fout = fopen( "config.pcm", "wb" ); if ( fout ) { //write the time of power function fwrite( &m_uTime, sizeof( int ), 1, fout ); unsigned long temp; //write tasks //number of day task temp = m_alltasks.size(); fwrite( &temp, sizeof( long ), 1, fout ); for ( int i = 0; i < m_alltasks.size(); i++ ) { //date fwrite( &m_alltasks[i].date, sizeof( MYDATE ), 1, fout ); //number of notes in that day temp = m_alltasks[i].tasks.size(); fwrite( &temp, sizeof( long ), 1, fout ); //notes for ( int j = 0; j < m_alltasks[i].tasks.size(); j++ ) { fwrite( &m_alltasks[i].tasks[j], sizeof( TASK ), 1, fout ); } } //how many hotkeys have been defined temp = m_hkArr.size(); fwrite( &temp, sizeof( long ), 1, fout ); //write the list of hotkeys for ( int i = 0; i < temp; i++ ) fwrite( &m_hkArr[i], sizeof( HOTKEY ), 1, fout ); fclose( fout ); } else { MessageBox( _T( "Can't write config file" ), _T( "Warning" ) ); OnCancel(); } //unregister hotkeys for ( int i = 0; i < m_hkArr.size(); i++ ) { UnregisterHotKey( m_hWnd, m_hkArr[i].id ); GlobalDeleteAtom( m_hkArr[i].id ); } OnCancel(); They all work except for the code I bolded ( file pointer still increase, but the file is not change )... Help me plz >.<...

            D Offline
            D Offline
            David Crow
            wrote on last edited by
            #12

            Cadimi wrote:

            FILE *fout = fopen( "config.pcm", "wb" );

            Are you using a relative path? What is the value of temp?

            "Love people and use things, not love things and use people." - Unknown

            "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

            C 1 Reply Last reply
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            • D David Crow

              Cadimi wrote:

              FILE *fout = fopen( "config.pcm", "wb" );

              Are you using a relative path? What is the value of temp?

              "Love people and use things, not love things and use people." - Unknown

              "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

              C Offline
              C Offline
              Cadimi
              wrote on last edited by
              #13

              temp is the number of hotkeys, its value is the size of the vector contain my HOTKEY struct

              D 1 Reply Last reply
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              • C Cadimi

                temp is the number of hotkeys, its value is the size of the vector contain my HOTKEY struct

                D Offline
                D Offline
                David Crow
                wrote on last edited by
                #14

                Cadimi wrote:

                temp is the number of hotkeys, its value is the size of the vector contain my HOTKEY struct

                I know what it represents. I asked what its value was (at the time of writing to the file).

                "Love people and use things, not love things and use people." - Unknown

                "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

                C 1 Reply Last reply
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                • D David Crow

                  Cadimi wrote:

                  temp is the number of hotkeys, its value is the size of the vector contain my HOTKEY struct

                  I know what it represents. I asked what its value was (at the time of writing to the file).

                  "Love people and use things, not love things and use people." - Unknown

                  "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

                  C Offline
                  C Offline
                  Cadimi
                  wrote on last edited by
                  #15

                  I tried a simple example, its value at that time is 1

                  D 1 Reply Last reply
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                  • C Cadimi

                    I tried a simple example, its value at that time is 1

                    D Offline
                    D Offline
                    David Crow
                    wrote on last edited by
                    #16

                    Ok, what do the two subsequent calls to fwrite() return?

                    "Love people and use things, not love things and use people." - Unknown

                    "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

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                    • D David Crow

                      Ok, what do the two subsequent calls to fwrite() return?

                      "Love people and use things, not love things and use people." - Unknown

                      "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

                      C Offline
                      C Offline
                      Cadimi
                      wrote on last edited by
                      #17

                      I just watch the file pointer, it increase the value equal to the size I've requested to write on file

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                      • C Cadimi

                        I just watch the file pointer, it increase the value equal to the size I've requested to write on file

                        D Offline
                        D Offline
                        David Crow
                        wrote on last edited by
                        #18

                        But what do the two subsequent calls to fwrite() return?

                        "Love people and use things, not love things and use people." - Unknown

                        "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

                        C 1 Reply Last reply
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                        • D David Crow

                          But what do the two subsequent calls to fwrite() return?

                          "Love people and use things, not love things and use people." - Unknown

                          "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

                          C Offline
                          C Offline
                          Cadimi
                          wrote on last edited by
                          #19

                          I've found my problem :D... It happened when I ust CFileDialog in another code, select a path, then the default directory change too => write file at another place => can't read. Thanks for your help

                          D 1 Reply Last reply
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                          • C Cadimi

                            I've found my problem :D... It happened when I ust CFileDialog in another code, select a path, then the default directory change too => write file at another place => can't read. Thanks for your help

                            D Offline
                            D Offline
                            David Crow
                            wrote on last edited by
                            #20

                            Cadimi wrote:

                            ...can't read.

                            Which is why I was asking if fopen() was failing.

                            "Love people and use things, not love things and use people." - Unknown

                            "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

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