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CTextFile: A handy helper

, 30 Mar 2005
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A small helper class for reading, writing and appending to/from text files.

Introduction

While perhaps not the most impressive of classes, this one is at least useful. It lets you read, write and append to text files from a CString or CStringArray, as well as load and save to and from list- and editboxes. While not what you need to manage your data in an application, it can be used for configuration files, text dumps during development, and other such small tasks. And - it will pop up a file dialog if no file name is given to any of the member calls.

Using the code

Instantiate a CTextFile and fire away! Here is an example:

CString str("");
CTextFile tf("gnu");
  if( !tf.Save( str, m_editLoad ) )
    if( str.GetLength() )
      AfxMessageBox( tf.GetErrorMessage() );

which saves the contents of the edit box m_edit. As str (the filename) is empty, CTextFile will display a file dialog, and str will contain the selected filename on return.

In the ctor, an extension and the end-of-line marker can be given. The extension defaults to "", e-o-l to "\r\n". The extension will be used to filter files if the standard file dialog is displayed. The somewhat limited support for end-of-line markers include reading from a file to a single CString, and when writing files from a CStringArray.

  • CTextFile::CTextFile( const CString& ext, const CString& eol )

    The ctor. ext can contain the default extension ("txt", for example), and eol the end-of-line marker ("\n", for example). ext defaults to "" and eol to "\r\n".

  • BOOL CTextFile::ReadTextFile( CString& filename, CStringArray& contents )

    Will read the contents of the file filename into the CStringArray contents, one line at a time.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return.

  • BOOL CTextFile::ReadTextFile( CString& filename, CString& contents )

    Will read the contents of the file filename into contents.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return.

  • BOOL CTextFile::WriteTextFile( CString& filename, const CStringArray& contents )

    Writes contents to filename. Will create the file if it doesn't already exist, overwrite it otherwise.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return.

  • BOOL CTextFile::WriteTextFile( CString& filename, const CString& contents )

    Writes contents to filename. Will create the file if it doesn't already exist, overwrites it otherwise.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return.

  • BOOL CTextFile::AppendFile( CString& filename, const CString& contents )

    Appends contents to filename. Will create the file if it doesn't already exist.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return. AppendFile will not add end-of-line markers.

  • BOOL CTextFile::AppendFile( CString& filename, const CStringArray& contents )

    Appends contents to filename. Will create the file if it doesn't already exist.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return.

  • BOOL CTextFile::Load( CString& filename, CEdit* edit )

    Loads a text file from filename to edit.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return. No translation of end-of-line markers will be made.

  • BOOL CTextFile::Load( CString& filename, CListBox* list )

    Loads a text file from filename to list.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return.

  • BOOL CTextFile::Save( CString& filename, CEdit* edit )

    Saves the contents of edit to the file filename. The file will be created or overwritten.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return. Note that the end-of-line markers from the editbox will be used.

  • BOOL CTextFile::Save( CString& filename, CListBox* list )

    Saves the contents of list to the file filename. The file will be created or overwritten.

    If filename is empty, the standard file dialog will be displayed, and - if OK is selected - filename will contain the selected filename on return.

  • CString CTextFile::GetErrorMessage()

    Retrieves the error message. Should be called after any of the file operations that return FALSE and if the file name is not empty.

Points of Interest

I have to admit it, there are absolutely none. This class was really easy to cobble together, but it has been a great time-saver in its earlier incarnations.

History

  • 2004/03/22 - Initial version.
  • 2005/05/25 - Corrected bug in CTextFile::GetFilename, the creation of the filter string.

License

This article, along with any associated source code and files, is licensed under A Public Domain dedication

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About the Author

Johan Rosengren
Software Developer (Senior) Abstrakt Mekanik AB
Sweden Sweden
45 years old, married, three kids.
 
Started with computers more than 20 years ago on a CBM-64.
 
Read Theoretical Philosophy at the University of Lund.
 
Working as a C++ consultant developer.
 
Science-fiction freak. Enjoy vintage punkrock.

Comments and Discussions

 
GeneralRe: How to read the file fully? PinmemberThiagarajan Rajendran31-Oct-04 16:57 
GeneralRe: How to read the file fully? PinmemberJohan Rosengren1-Nov-04 5:55 
Generaltexfile for pocket pc Pinmemberriki_risnandar1-Oct-04 11:04 
GeneralRe: texfile for pocket pc PinmemberJohan Rosengren1-Oct-04 20:01 
GeneralRe: texfile for pocket pc Pinmemberriki_risnandar12-Oct-04 9:27 
GeneralRe: texfile for pocket pc PinmemberJohan Rosengren12-Oct-04 21:59 
GeneralRe: texfile for pocket pc PinmemberEdipo22-Nov-04 23:39 
GeneralRe: texfile for pocket pc PinmemberJohan Rosengren23-Nov-04 7:43 
It is only the first error that is interesting, getting rid of that will get rid of the rest Smile | :)
 
C2629 means a syntax error. Now, we know that the code *almost* works on Pocket PC (of which I have far to little knowledge, I'm sorry to say), so I would advice checking if the rest of the project compiles without these files, so as to rule out syntax errors in code outside the class.
 
If that works, you might want to add back the header file (and include it in some implementation file), but comment out the stuff inside the class brackets.
 
We are only interested in getting through the compile at this stage - never mind about linking!
 
Finally, start "un-commenting-out" function by function until you find the problematic declaration. If it so happens that you unveil a problem that should be fixed in the next update of the class, please post that info, so that the all and every person who might want to use this class in Pocket PC don't have to reinvent the wheel!
 
Note from the posts of the previous poster in this thread that you will have to do further modifications to the implementation as well.
 

GeneralRe: texfile for pocket pc Pinmemberriki_risnandar23-Nov-04 10:16 
GeneralRe: texfile for pocket pc PinmemberEdipo23-Nov-04 12:12 
GeneralRe: texfile for pocket pc PinmemberJohan Rosengren25-Nov-04 5:13 
GeneralRe: texfile for pocket pc Pinmemberriki_risnandar25-Nov-04 12:34 
GeneralRe: texfile for pocket pc PinmemberEdipo26-Nov-04 2:48 
GeneralRe: texfile for pocket pc PinmemberJohan Rosengren26-Nov-04 7:05 
GeneralRe: texfile for pocket pc PinmemberJohan Rosengren25-Nov-04 5:10 
GeneralReally Fantastic Pinmemberbaoiph9-Jun-04 2:28 
QuestionHow to check whether the file exist or not?? PinmemberJigar Mehta4-Jun-04 20:20 
AnswerRe: How to check whether the file exist or not?? PinmemberJohan Rosengren4-Jun-04 20:40 
AnswerRe: How to check whether the file exist or not?? Pinmemberyarp30-Mar-05 17:35 
General! Good, but it's a wheel PinmemberSynetech1-May-04 15:02 
GeneralRe: ! Good, but it's a wheel PinmemberJohan Rosengren1-May-04 23:34 
GeneralRe: ! Good, but it's a wheel PinmemberSynetech2-May-04 13:38 
GeneralRe: ! Good, but it's a wheel PinmemberJohan Rosengren2-May-04 21:08 
QuestionHow use this code for UNICODE text files ? PinmemberCDU31-Mar-04 21:03 
AnswerRe: How use this code for UNICODE text files ? PinmemberJohan Rosengren31-Mar-04 21:16 

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