How to convert QString to std::string or char*?

[yogeshgokul]

Then why QString class have this function.

QString QString::fromUtf8 ( const char * str, int size = -1 )   [static]

QString QString::fromUtf8 ( const char * str, int size = -1 )   [static]

To copy to clipboard, switch view to plain text mode 

This function takes char* parameter and function name says fromUtf8. Does it mean Qt accepting Utf8 formatted string pointed by char*.
So it implies Qt itself saying that a Utf8 formatted string can be pointed by char*.