CODEWITHSUNDEEP
c++mfc
Elamir Ohana
Elamir Ohana

Reputation: 292

How to write white spaces in a CStdioFile?

I'm using a CStdioFile and trying to leave a number of white spaces before writing a CString. I tried CStdioFile.Seek(iNumOfSpaces, CStdioFile::current) the i write the string. the problem is that when I open the file in Notepad++ it writes NUL instead of the white spaces. How to write the white spaces to be viewed as white not NUL? Thanks in advance

Upvotes: 0

Views: 267

Answers (2)

Алексей Неудачин
Алексей Неудачин

Reputation: 415

1.

CString hh="i7mjmhb";
CString h(' ',31);
hh=h+hh;

2.

CString hh=L"i7mjmhb";
CString h(L' ',31);
hh=h+hh;

With files it's bad not to know forward is it ascii or unicode stuff

Upvotes: -2

Andrew Komiagin
Andrew Komiagin

Reputation: 6556

You misunderstood what CFile::Seek() method does. It moves the file pointer to a specified position, absolutely or relatively. It does not add/modify the content of the file.

Instead you should use CString::Format() method that supports padding. Here is an example that shows how to use it:

CString s;  
s.Format(_T("|%-10s|"), _T("Data")); // left-align
s.Format(_T("|%10s|"), _T("Data")); // right-align

The result string is going to look like:

|Data      |
|      Data|

Here is an example that shows how to implement dynamic (variable length) padding:

CString s;  
int n = 10;
s.Format(_T("|%-*s|"), n, _T("Data")); // left-align
s.Format(_T("|%*s|"), n, _T("Data")); // right-align

Upvotes: 5

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