将 QVariant 转换为 char*

Question

I have a variable of type QVariant in Qt5:

my_var = QVariant(QString, "(198.95875549316406, 124.93024444580078, 38.149349212646484)")

How can I get a char* with the coordinates?

Like

char * my_char = "(198.95875549316406, 124.93024444580078, 38.149349212646484)";

Answer 1

For example like this:

QVariant my_var(QString(
  "(198.95875549316406, 124.93024444580078, 38.149349212646484)"));
qDebug() << my_var.toString();
auto std_str = my_var.toString().toStdString();
const char* ptr = std_str.c_str();
std::cout << ptr << std::endl;

Just don't do it in one line like my_var.toString().toStdString().c_str() because temporary std::string created by toStdString will be immediately destroyed and your raw const char* pointer invalidated.