convert from QString to char[sizeof(...)]

[ChrisW67]

The scope of temporary objects is the end of the statement (i.e. the semi-colon). The temporary QByteArray is valid until the end of the some_c_api() function call.

Something like this would be risky:

const char *s = theString.toLatin1().constData();  
// the byte array disappears here but you are holding a pointer to some of its deallocated memory
some_c_api(s);
// potential boom

const char *s = theString.toLatin1().constData();  
// the byte array disappears here but you are holding a pointer to some of its deallocated memory
some_c_api(s);
// potential boom

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