Thread: I give up - TCHAR, char - initializing/printing

Google simply is not definitive for figuring out any of this C syntax.

Can someone provide the syntax for every variation of initializing TCHAR or char single-byte (non-array) and array strings?

Initialize to a null string.
Initialize to a valid string w/ len of zero.
Initialize to a hex value(s).
Initialize to decimal byte values.

For the TCHAR/char statement itself as well as later, in the BODY of the program (e.g. on-the-fly). I'm looking for simple assignment statements (not for loops).

It seems the compiler treats a NON-array char/tchar differently from one with a [] or [someintegernumber] at definition time.

Also, I've gotten confused. If have gotten rid of all the char in my program and replaced with TCHAR. Everything works.

I am using _tprintf.

Should I use:

_tprintf(L"string");

or

_tprintf(_T"string"); - what header is this _T _TEXT thing in anyway?


While we're here:

#define FRUNREC 0x01 // recurse all directories
#define FRUNDIR 0x02 // return directories
#define FRUNFILE 0x04 // return files


int Frun (TCHAR* Fruni, TCHAR Fruniopb, void (*FrunCB)(TCHAR* FrunCBt)) {


Invoking this function has a peculiarity:


char Frunopb = FRUNDIR | FRUNREC;
TCHAR Frunopbt = { FRUNDIR | FRUNREC };
TCHAR TCHdir[300];

z = Frun( TCHdir, Frunopbt, print1 );

The above has no & before TCHdir and Frunopbt yet one is passed as TCHAR* and the other as TCHAR. Why the difference? My hunch is it has something to do with the TCHAR Frunopbt not being an "array"?

Do not use TCHAR's. There's no reason to. More rationale here: To _T() or not to _T()? - CodeGuru Forums

gg

My hunch is it has something to do with the TCHAR Frunopbt not being an "array"?

That's exactly right. The name of an array is essentially a pointer.

For questions on this forum, you're best to get rid of the whole TCHAR thing. You're still learning char, char*, char[] etc. No need to complicate things. You can learn TCHAR (a Microsoft specific thing) later.

I already understand TCHAR. I just don't know how to initialize TCHAR strings. I have to keep trying every possible combination of syntax.

>> I saw you post that before, but I thought the concensus was use TCHAR.
Perhaps that isn't the best thread to link to, since the other person doesn't know how to carry on an argument/debate. The important information is here:
CodeGuru Forums - View Single Post - To _T() or not to _T()?
CodeGuru Forums - View Single Post - To _T() or not to _T()?

>> _sntprintf(szOne, sizeof(szOne) ...
Second parameter is "element count", not byte count. So "sizeof(szOne) / sizeof(*szOne)".

gg

I read Codeplug's post on the other site and yes it's all true.
However, I still say go ahead and use TCHAR. You'll personally get more out of having gone there and seen how it all works for yourself, and you'll be in a much better position to understand others' programs.
You just put _T() around every string literal or char literal.

iMalc, I'm inclined to use TCHAR. I have, mistakenly, put L" in every _tprintf statement. I will change to _T. My conversion from char to TCHAR went quite quickly and with no hitches.

Can someone help me with my original post/request. I had particular troubles trying to assign a hex value to a TCHAR. Took me about 15 minutes of playing around. I don't have my source handy to say what I finally did to get the 0xnnn assignment working.

Code:

TCHAR test = { } syntax
TCHAR test[] = { } syntax
TCHAR test = _T"this is easy to understand"; (add szero on the end)
TCHAR test = { 10 }; will that put a \n double-wide character in test?

I have trouble with why you can't seem to say things like:

Code:

test[0] = anothertchar[0];

It seems you have to _tcscpy one to the other.

It works just fine.

Code:

#include "stdafx.h"

int _tmain(int argc, TCHAR* argv[]) {
    _tprintf(_UNICODE ? _T("UNICODE mode\n") : _T("ASCII mode\n"));
    TCHAR str1[10] = _T("hello");
    TCHAR str2[10] = _T("goodbye");
    str1[0] = str2[0];
    _tprintf(_T("str1 is now [%s]\n"), str1);  // This prints: str1 is now [gello]
    return 0;
}