C / C++ / MFC

typedef struct {
	 int itoneEncoding;
	 double dtoneLeadin;
	 double dtoneLength;
	 int iBuffersize;
}TONE, * PTONE;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
    <<SNIP>>
}

BOOL FillBuffer (PBYTE pBuffer, TCHAR * pszToneCode, PTONE tsTone)
{
     int	 iBuffer;
       << SNIP >>
    
        iBuffer = tsTone->iBuffersize;

	// a=49 A=17 - add codition for lower case letters !!
	for(icTone = 0; icTone < 5; icTone++)
	{
        << SNIP >>
		else
			return FALSE;
		
	<< SNIP >>
	return TRUE;
}

BOOL CALLBACK DlgProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     <<SNIP >>

     static TONE tsTone;

     switch (message)
     {
     << SNIP >>

          case IDC_ONOFF:

                    // Set up TONE structure with variables.
		tsTone.itoneEncoding = iEncoding;
		tsTone.dtoneLeadin = GetDlgItemInt(hwnd, IDC_EDIT_LEADIN, NULL ,FALSE);
		tsTone.dtoneLength = GetDlgItemInt(hwnd, IDC_EDIT_TONELENGTH, NULL ,FALSE);
					

                // calcuate buffer size SAMPLE_RATE * tone length in milliseconds
		// multiplied by 5 for complete buffer size of 5 tones.
		tsTone.iBuffersize = (int)(SAMPLE_RATE * (tsTone.dtoneLength/1000)*5);
        
               <<SNIP>>
               
     case MM_WOM_OPEN:
          SetDlgItemText (hwnd, IDC_ONOFF, TEXT ("Turn Off")) ;

               // Send buffer to waveform output device
          GetDlgItemText  (hwnd, IDC_TONECODE, szToneCode, 6) ;
          if(!FillBuffer (pBuffer1, szToneCode, &tsTone))
		<<SNIP>>
                    
     case MM_WOM_DONE:
	<<SNIP>>
          
      case WM_SYSCOMMAND:
          switch (wParam)
          <<SNIP>>
               return TRUE ;
          }
          break ;

	 }
     return FALSE ;
}

1>PrefDlg.obj : error LNK2019: unresolved external symbol "protected: char * __thiscall CPrefDlg::EventTypeString(unsigned short)" (?EventTypeString@CPrefDlg@@IAEPADG@Z) referenced in function "protected: int __thiscall CPrefDlg::CreateEventLogEntryFile(int)" (?CreateEventLogEntryFile@CPrefDlg@@IAEHH@Z)
1>D:\SVN\Licensin System\Work Package\UpdateManager\Debug\UpdatePanel.cpl : fatal error LNK1120: 1 unresolved externals