How to use "quote" in TEXT(quote)

Hi there.

I'd like to change "quote" in TEXT(quote), i.e. for example,

char *temp = "filename0";
for(i=0; i<10; i++) {
....
function(TEXT(temp), ...);
filename[8] += 1;
....

This code will be an error as follow :
error C2065: 'L_temp' : undeclared identifier

And without TEXT() function fails due to ERROR_FILE_NOT_FOUND.

Is there any good idea?

Thanks.

Ulrich
Thu Feb 22 03:25:49 CST 2007

I.You wrote:
> I'd like to change "quote" in TEXT(quote), i.e. for example,
>
> char *temp = "filename0";

Note: the conversion of a string literal to a non-const char pointer is only
supplied for backward compatibility with C and deprecated. Using it to
modify things (like you do below) is an error anyway, consider using a
temporary array.

> for(i=0; i<10; i++) {
> ....
> function(TEXT(temp), ...);
> filename[8] += 1;
> ....
>
> This code will be an error as follow :
> error C2065: 'L_temp' : undeclared identifier

Take a look at the TEXT macro. The only thing it does is prefix L when
_UNICODE is defined and leave the string as it is otherwise, so it conforms
to TCHAR. However, this is a preprocessor macro and not a function,
therefore you can only use it with string literals.

What you should perhaps do is to use TCHAR all the way through:

TCHAR temp[] = TEXT("filename0");
for(...) {
function(temp);
++temp[8];


Also, how about using C++ and then taking the string types it provides? For
TCHAR, I'd suggest

typedef std::basic_string<TCHAR> tstring;


> And without TEXT() function fails due to ERROR_FILE_NOT_FOUND.

Said macro won't change that. I guess there is some other broken code that
makes some assumptions that finally fail.

Uli

IYou
Thu Feb 22 03:53:22 CST 2007

Thanks a lot Uli.

I see.
and very helpful for me.

Regards.
I.You

"Ulrich Eckhardt" wrote:

> I.You wrote:
> > I'd like to change "quote" in TEXT(quote), i.e. for example,
> >
> > char *temp = "filename0";
>
> Note: the conversion of a string literal to a non-const char pointer is only
> supplied for backward compatibility with C and deprecated. Using it to
> modify things (like you do below) is an error anyway, consider using a
> temporary array.
>
> > for(i=0; i<10; i++) {
> > ....
> > function(TEXT(temp), ...);
> > filename[8] += 1;
> > ....
> >
> > This code will be an error as follow :
> > error C2065: 'L_temp' : undeclared identifier
>
> Take a look at the TEXT macro. The only thing it does is prefix L when
> _UNICODE is defined and leave the string as it is otherwise, so it conforms
> to TCHAR. However, this is a preprocessor macro and not a function,
> therefore you can only use it with string literals.
>
> What you should perhaps do is to use TCHAR all the way through:
>
> TCHAR temp[] = TEXT("filename0");
> for(...) {
> function(temp);
> ++temp[8];
>
>
> Also, how about using C++ and then taking the string types it provides? For
> TCHAR, I'd suggest
>
> typedef std::basic_string<TCHAR> tstring;
>
>
> > And without TEXT() function fails due to ERROR_FILE_NOT_FOUND.
>
> Said macro won't change that. I guess there is some other broken code that
> makes some assumptions that finally fail.
>
> Uli
>
>