[MFC] write text file

Question

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When outputting using a struct
Is there a way to line up when outputting to a text file?

like this (Text.txt)

item1          item2         item3          item4          item5
dataab         datadd        dat            dataabceed     data         
data123432     dataabcdefgad data___NULLL   data           data12341

C++

// struct use pack
#pragma pack(push, 2)
struct stReportItem
{
	TCHAR psz_REPORT_ITEMS[REPORT_ITEM_CNT][STRLEN];
	stReportItem()
	{
		for(int i = 0; i < REPORT_ITEM_CNT; i++)
			memset(psz_REPORT_ITEMS[i], '0', sizeof(TCHAR) * STRLEN);

	}
};
#pragma pack(pop)

What I have tried:

C++

void CMainDlg::OnBnClickedBtnOutTxt()
{
	CFile file;

	if (!file.Open(_T("C:\\Temp\\Text.txt"), CFile::modeCreate | CFile::modeWrite, NULL))
	{
		AfxMessageBox(_T("Failed create file"));
		return;
	}

	for (int i = 0; i < m_vstReport.size(); i++)
	{
		stReportItem stTemp = m_vstReport.at(i);
		for (int j = 0; j < REPORT_ITEM_CNT; j++)
		{
			file.Write(stTemp.psz_REPORT_ITEMS[j], sizeof(stTemp.psz_REPORT_ITEMS[j]));
		}
		file.Write(_T("\r\n"), sizeof(_T("\r\n")));
	}

	file.Flush();
	file.Close();

	ShellExecute(NULL, "open", "c:\\windows\\notepad.exe", _T("C:\\Temp\\Text.txt"), NULL, SW_SHOWNORMAL);
}

Posted 17-Jun-21 19:43pm

Member 10770708

Updated 18-Jun-21 0:42am

Maciej Los

v2

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Richard MacCutchan · Answer 1 · 2021-06-17T21:39:00

Solution 1

Use sprintf (printf, fprintf, sprintf, snprintf, printf_s, fprintf_s, sprintf_s, snprintf_s - cppreference.com[^]) to format the text into fixed field widths. You can then write the resultant string to your CFile object.

Posted 17-Jun-21 21:39pm

Richard MacCutchan

Updated 18-Jun-21 0:59am

v2

Comments

Maciej Los 18-Jun-21 3:45am

5ed!
I haven't seen the question till i did changes (formatting).

Richard MacCutchan 18-Jun-21 6:59am

Thanks. I modified my answer to allow the use of file.Write.

KarstenK · Answer 2 · 2021-06-18T00:42:00

The common way is to write string conversion function for struct. Like

C++

// create string with delimiter (like ',') for all data
CString toText(stReportItem *data);
// parse the above data into members of struct
stReportItem.parse(CString text);

by the way

C++

memset(psz_REPORT_ITEMS[i], 0, sizeof(struct stReportItem));

zero out string and not writing a char in the buffer