Qt Creator不能使用const char *

Question

I was just testing with qt creator and seem to like it as the gui of my C++. Working around with some stuff and it seems that I can't use const char*!

If I add a function:

header

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    const char* nativeStr(QString str1);

cpp

const char* nativeStr(QString str1){
    QByteArray ba = str1.toLocal8Bit();
    return (const char*)ba.data();
}

I get the error (when debugging):

LNK2019: unresolved external symbol "public: char const * -_thiscall MainWindow::nativeStr(class QString)" 9?nativeStr @MainWindow@@QAEPBDVQString@@@z) referenced in function "private: void __thiscall MainWindow::on_pushButton_clicked(void)" (?on_pushButton_clicked@MainWindow@@AAEXXZ)

File not found: mainwindow.obj

Help? I have no idea and I've only used win32 C++ before.

I've also tried: build->clean all build->run qmake

Answer 1

You're missing the MainWindow:: part of the function name:

const char* MainWindow::nativeStr(QString str1){
    QByteArray ba = str1.toLocal8Bit();
    return (const char*)ba.data();
}