QT中QString 转stringQString 转 const char *

QString 中只有英文字符（转string）

QString filename = QFileDialog::getOpenFileName();

//QString filename = "F:/picture/opencv/01/8.png";

std::string str = filename.toLatin1().toStdString();

输出：F:/picture/opencv/01/8.png

QString中有中文字符(转 const char *)

QString filename = QFileDialog::getOpenFileName();

//QString filename D:/我的文档/Pictures/opencv/01/人物2.png

string s1 = string(filename.toLocal8Bit());

const char *str = s1.c_str();

输出：D:/我的文档/Pictures/opencv/01/人物2.png