Visual C++ and MFC Programming 2nd Edition

Chapter 9 Strings Visual C++ and MFC Fundamentals

?? If a character at one position x has an ordered value higher than the

corresponding character at the same position x on the other string, the method

returns a positive value and stops the comparison

?? If a character at one position x has an ordered value lower than the

corresponding character at the same position x on the other string, the method

returns a negative value and stops the comparison

Here is an example:

void CExerciseView::OnDraw(CDC* pDC)

{

CExerciseDoc* pDoc = GetDocument();

ASSERT_VALID(pDoc);

CString YS = "Jeremy Stanley";

CString IS = "Jeremie Andy";

int Result = YS.CollateNoCase(IS);

if( Result > 0 )

pDC->TextOut(10, 20, "Jeremy Stanley is Higher than Jeremie Stanley");

else if( Result == 0 )

pDC->TextOut(10, 20, "Jeremy Stanley and Jeremie Stanley are equal");

else // if( Result < 0 )

pDC->TextOut(10, 20, "Jeremy Stanley is Lower than Jeremie Stanley");

}

Alternatively, to perform case-insensitive string comparison on CString variables, you

can use the CompareNoCase() method. Its syntax is:

int CompareNoCase(LPCTSTR lpsz) const;

The CompareNoCase() method does not refer to the user’s Regional Settings when

performing its comparison.

Besides the CollateNoCase() and the CompareNoCase() methods, the CString class

provides an easier and probably more familiar means of performing value comparisons.

Character insensitive comparisons on CString variables can be performed using Boolean

operators ==, !=, <, <=, >, >=. Any of these operators can be applied on two CString