C++之Qstring转Standard_Cstring

方法一：先转化为std::string

QString filename = QFileDialog::getOpenFileName(this, "open file dialog", "/", "step files(*.step)");
if (!filename.isEmpty()) {
    std::string stdfilename = filename.toStdString();
    const char* cstr = stdfilename.c_str();
    TopoDS_Shape stepShape = occ.Open_File(cstr);
​

方法二：直接转化

QString filename
filename.toUtf8().data()
​