CString comparison

[BreckO]

Hello. I want to compare a CString object to a char[] with a string in it. Can I just use the CString == operator or do I have to convert the string or CString first before I can compare them? Thanks in advance.

T

[BobClarke]

The CString operator== compares CStrings, not CStrings with something else.

Either convert your chars to a CString, or pull out the CString's string and use things like strcmp().

[BreckO]

What is the best way to pull out the CString string? That's the current problem I am wrestling with. Should I just cast it as a LPTCSTR and place it in a buffer and then strcmp the temp buffer with the other string? Thanks a lot for your help.

[BobClarke]

It might be easier to convert the char[] to a CString and use its comparison functions.


// example of char[] to CString
SYSTEMTIME sysTime;
GetLocalTime(&sysTime);
char pIToA[5];
itoa(sysTime.wMonth, pIToA, 10);
CString cMonth(pIToA);
itoa( sysTime.wDay, pIToA, 10);
CString cDay(pIToA);
itoa(sysTime.wYear, pIToA, 10);
CString cYear(pIToA);
CString cLine = cMonth + "/" + cDay + "/" + cYear.Right(2);

[BreckO]

Hmm that might be a viable solution. But if I need to go CString to char[] do you recommend anything? The application I am working on has existed for 8 years of hand me downs and is not easy to change the style on. Thanks for your help.

[BobClarke]

Use the LPCTSTR operator of the CString class and do your strcmp.

[BreckO]

Thanks I gave you some points!

[ALM]

Actually Bob, there are 3 versions of the global equality operator, according to the help:

BOOL operator ==( const CString& s1, const CString& s2 );
BOOL operator ==( const CString& s1, LPCTSTR s2 );
BOOL operator ==( LPCTSTR s1, const CString& s2 );



So you CAN compare CStrings to char arrays without having to convert them.

Regards,
Alvaro

[ALM]

No conversion's necessary. There are 2 possible equality operators that will handle the comparison:


BOOL operator ==( const CString& s1, LPCTSTR s2 );
BOOL operator ==( LPCTSTR s1, const CString& s2 );



Regards,
Alvaro