Saving in binary

This is a discussion on Saving in binary within the C++ Programming forums, part of the General Programming Boards category; I am trying to save some variables to a .txt file... I get strange linker errors when I try to ...

  1. #1
    Registered User
    Join Date
    Feb 2005
    Posts
    22

    Saving in binary

    I am trying to save some variables to a .txt file...
    I get strange linker errors when I try to write or read these files.

    My headers...

    Code:
      
    #include <iostream>
    #include <fstream>
    #include <string>
    #include <cstring>
    using namespace std;
    Inializing the structures
    Code:
    struct Variables
    {
     int distOnOff;
     int distDrive;
     int distClip;
     int distOverdrive;
     int distAfterwah;
     int distSatOnOff;
     int distSaturation;
     int distLpFilter;
     int distLpFilterQ;
     int distBoostOnOff;
     int distBoostHz;
     int distBoostDb;
    };
    #pragma pack(push, 1)
    struct FileData
    {
       int var_int;
       char var_string[13];
       Variables var_struct;
    };
    #pragma pack(pop)
    initializing the functions performing the serializtion
    Code:
    bool ReadSerialized(const char * filename, const FileData & data);
    bool WriteSerialized(const char * filename, FileData & data);
    My function calling the serialization
    Code:
    void CFXBOXDlg::ClickBadd()
    {
    // TODO: Add your message handler code here
    UpdateData(TRUE);
    
    m_presetCtr.AddString(m_presetStr);
    
    /******/
    FileData data_out;
    
    data_out.var_struct.distOnOff = m_distOnOff;
    data_out.var_struct.distDrive = m_distDrive;
    data_out.var_struct.distClip = m_distClip;
    data_out.var_struct.distOverdrive = m_distOverdrive;
    data_out.var_struct.distAfterwah = m_distAfterwah;
    data_out.var_struct.distSatOnOff = m_distSatOnOff;
    data_out.var_struct.distSaturation = m_distSaturation;
    data_out.var_struct.distLpFilter = m_distLpFilter;
    data_out.var_struct.distLpFilterQ = m_distLpFilterQ;
    data_out.var_struct.distBoostOnOff = m_distBoostOnOff;
    data_out.var_struct.distBoostHz = m_distBoostHz;
    data_out.var_struct.distBoostDb = m_distBoostDb;
    
    WriteSerialized("Presets.txt", data_out);
    
    FileData data_in;
    ReadSerialized("Presets.txt", data_in);
    m_distOnOff = (int)data_in.var_struct.distOnOff;
    m_distDrive = (int)data_in.var_struct.distDrive;
    m_distClip = (int)data_in.var_struct.distClip;
    m_distOverdrive = (int)data_in.var_struct.distOverdrive;
    m_distAfterwah = (int)data_in.var_struct.distAfterwah;
    m_distSatOnOff = (int)data_in.var_struct.distSatOnOff;
    m_distSaturation = (int)data_in.var_struct.distSaturation;
    m_distLpFilter = (int)data_in.var_struct.distLpFilter;
    m_distLpFilterQ = (int)data_in.var_struct.distLpFilterQ;
    m_distBoostOnOff = (int)data_in.var_struct.distBoostOnOff;
    m_distBoostHz = (int)data_in.var_struct.distBoostHz;
    m_distBoostDb = (int)data_out.var_struct.distBoostDb;
    
    /******/
    m_presetStr = "";
    UpdateData(FALSE);
    }
    My errors (one for each) ->WriteSerialized("Presets.txt", data_out);
    ->ReadSerialized("Presets.txt", data_in);

    Code:
    FXBOX error LNK2019: unresolved external symbol "protected: bool __thiscall CFXBOXDlg::ReadSerialized(char const *,struct FileData const &)" (?ReadSerialized@CFXBOXDlg@@IAE_NPBDABUFileData@@@Z) referenced in function "protected: void __thiscall CFXBOXDlg::ClickBadd(void)" (?ClickBadd@CFXBOXDlg@@IAEXXZ)
    FXBOX error LNK2019: unresolved external symbol "protected: bool __thiscall CFXBOXDlg::WriteSerialized(char const *,struct FileData &)" (?WriteSerialized@CFXBOXDlg@@IAE_NPBDAAUFileData@@@Z) referenced in function "protected: void __thiscall CFXBOXDlg::ClickBadd(void)" (?ClickBadd@CFXBOXDlg@@IAEXXZ)

  2. #2
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    Posts
    9,796
    >initializing the functions performing the serializtion
    You declare them, but you don't define them. The linker is complaining that neither of these functions has an executable body anywhere.
    My best code is written with the delete key.

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