Visual C++ and MFC Programming 2nd Edition

Chapter 9 Strings Visual C++ and MFC Fundamentals

void CExerciseView::OnDraw(CDC* pDC)

{

CExerciseDoc* pDoc = GetDocument();

ASSERT_VALID(pDoc);

CString Capital("Antananarivo");

CString Fifth = Capital.GetAt(4);

pDC->TextOut(10, 20, Capital);

pDC->TextOut(10, 40, Fifth);

}

9.5.2 Character Insertion..............................................................................

As stated already, a CString value is in fact an array of characters. This allows you to

locate a position in the string and change its character. To do this, you can use the

SetAt() method. Its syntax is:

void SetAt(int nIndex, TCHAR ch);

Here is an example:

#include <afxwin.h>

#include <iostream>

using namespace std;

int main()

{

CString Object("Wall");

cout << "Object: " << (LPCTSTR)Object << endl;

Object.SetAt(1, 'e');

cout << "Name: " << (LPCTSTR)Object << endl;

return 0;

}

9.5.3 Finding a Character.............................................................................

Scanning a string consists of visiting or examining each one of its characters. One of the

reasons you would do this is to look for a particular character that may be part of the

string.

To scan a string for a character, you can call the CString::Find() method. It is

overloaded as follows:

int Find(TCHAR ch) const;

int Find(TCHAR ch, int nStart) const;

To look for a single character in the string, pass a character value or variable as argument.

In this case, the string would be examined from the most left character to the right. If you

want the scanning to start at a certain position instead of from the most left character,

besides the character to look for, pass a second argument as nStart. If the character is