Convert qstring to char *

I found a very amazing problem.

In general, the conversion from qstring to char * is like this.

Qstring STR = "ABC ";
Char * Ch = Str. tolatin1.data ();

There is no problem with using this sentence. But when I add another sentence, it hurts.

Qstring STR = "ABC ";

Qstring str2 = "123"

Char * Ch = Str. tolatin1.data ();

Char * CH2 =Str. tolatin1.data ();

It seems that there is no problem. But I don't know why. I will have problems when using it.

In principle, the content that STR only wants should be "ABC", and str2 points to "123 ". However, when running on me, Both STR and str2 point to "123 "!

I finally found such a magical thing through Debug. It took me a few hours to get depressed!