Convert qstring, String, char *, and cstring

Recently, I am looking at QT development to summarize several methods for String Conversion.

There are many methods. Here is the most common method: char * is the most basic type. Other types can be converted to char * first, and then converted to the type.

Cstring-char *

Cstring CSTR = "This Is A cstring .";
Char * Ch = CSTR. getbuffer (CSTR. getlength () + 1 );
CSTR. releasebuffer ();

Tchar * tstr = _ T ("This Is A tchar * string .");

Cstring CSTR;
// Assign values directly

CSTR = tstr;
// Or use the format Function

CSTR. Format (_ T ("% s"), tstr );

 

String-char *

Const char * str1 = "this is a const char *.";
String STR (str1 );

String str1 = "this is a string .";
Char * str2 = const_cast <char *> (str1.c _ STR ());

 

Qstring-char *

Const char * STR = "this is a C string .";

Qstring qstr (qstring: fromlocal8bit (STR ));
Const char * str2 = qstr. tolocal8bit ();

 

Qstring-string

# Include <qstring>
# Include <vector>
# Include <iostream>
# Include <string>

Using namespace STD;
Qstring s2q (const string & S );
String q2s (const qstring & S );

Qstring s2q (const string & S)
{
Return qstring (qstring: fromlocal8bit (S. c_str ()));
}
String q2s (const qstring & S)
{
Return string (const char *) S. tolocal8bit ());
}