How Do I Still Use Document/View Architecture for This Application?

[sunnysky]

Hello,

I am learning to use MFC to code a small project to read and display csv files. I can't use CArchive to correctly read line by line of a text file as pointed out in this post: http://connect.microsoft.com/VisualS...s-chinese-text . So I decided to use CStdioFile as described here http://forums.codeguru.com/showthrea...e-line-by-line . So this means that I can't use Serialize() function of the document class and I need to handle ID_FILE_OPEN message other than CWinApp::OnFileOpen. So where shall I handle ID_FILE_OPEN message now and how can I still comply with the Document/View Architecture?

Thanks,
Brian

[GCDEF]

CArchive has a ReadString function that reads lines of text. Looks like it's designed to do what you want. Instead of using the >> operators, just use ReadString.

[sunnysky]

CArchive has a ReadString function that reads lines of text. Looks like it's designed to do what you want. Instead of using the >> operators, just use ReadString.

I have problem using CArchive::ReadString. I have the same problem as the first link in my original post.

[VictorN]

I have problem using CArchive::ReadString. I have the same problem as the first link in my original post.

But there was very clear explained that that the reason was:

... use CStringW to read a non-unicode text file in binary mode

So either use CStringA or use a unicode text file.

[sunnysky]

I tried to use CStringA but got an error.

void CCSVDisplayDoc::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		// TODO: add storing code here
	}
	else
	{
		CStringA row;
		ar.ReadString(row);
	}
}

error C2664: 'BOOL CArchive::ReadString(CString &)' : cannot convert parameter 1 from 'CStringA' to 'CString &'

How to generate a unicode text file?

[VictorN]

How to generate a unicode text file?

The simplest way - using Notepad. Open text file, then Save As... and select the Encoding Unicode from the combobox.

[GCDEF]

I tried to use CStringA but got an error.

void CCSVDisplayDoc::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		// TODO: add storing code here
	}
	else
	{
		CStringA row;
		ar.ReadString(row);
	}
}

How to generate a unicode text file?

It would probably make more sense to change your project properties to use MBCS instead of Unicode.

[VictorN]

Well, I never used CArchive and never had any problem to live without it.
For text/binary files i usualy use CStdioFile/CFile classes or just a plain API (CreateFile/ReadFile/WriteFile).
In case of database (like MS Access or SQL Server) - ADO (well, for Access I also used DAO, but it was more than a decade back). You can also use MFC ODBC classes or some other tolls depending on the DBMS you are using.

[sunnysky]

Hi Victor,

When you handle text/binary files with CStdioFile/CFile, where do you usually put the file handlers? Do you override CWinApp::OnFileOpen() to handle ID_FILE_OPEN message? If so, where do you put the message handler?

Thanks,
Brian

[VictorN]

I usally implemented my own reading in CDocument::OnOpenDocument override

[sunnysky]

I usally implemented my own reading in CDocument::OnOpenDocument override

Thanks Victor. So this way still comply with the Document/View architecture. From MSDN, http://msdn.microsoft.com/en-us/libr...v=vs.100).aspx I also found "Override this function if you want to use something other than the archive mechanism or the file mechanism."

Is it a good practice to call CDocument::OnOpenDocument() at the beginning of the new OnOpenDocument() function?

[GCDEF]

Thanks Victor. So this way still comply with the Document/View architecture. From MSDN, http://msdn.microsoft.com/en-us/libr...v=vs.100).aspx I also found "Override this function if you want to use something other than the archive mechanism or the file mechanism."

Is it a good practice to call CDocument::OnOpenDocument() at the beginning of the new OnOpenDocument() function?

Sounds like you need to step through the MFC code and get a better understanding of how it all works.

[VictorN]

Sounds like you need to step through the MFC code and get a better understanding of how it all works.

Agree!

[VictorN]

I do NOT call CDocument::OnOpenDocument() if I use my own mechanism instead of CArchive.
Besides, I usually use MDI rather than SDI.