QT乱码对策

using namespace std;

//#pragma execution_character_set("UTF-8")
int main(int argc, char *argv[])
{ 
QApplication a(argc, argv);
QString str = QStringLiteral("中文测试");
//str = "中文测试";
qDebug() << str;
//QMessageBox::information(0, "title", str);
char *src = "元数据中文GBK";

//元数据是gbk或者gb2312 多字节存入QString
//本地编码方式 默认GBK
QString str1 = QString::fromLocal8Bit(src);
qDebug() << "str1 = " << str1;

//把QString 转为gbk
cout << str1.toLocal8Bit().toStdString() << endl;
//本地处理编码方式，默认是GBK，改为UTF-8
QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
QString str2 = QString::fromLocal8Bit(str1.toUtf8());

QTextCodec::setCodecForLocale(QTextCodec::codecForName("GBK"));
qDebug() << "str2 = " << str2;
//win api调用qstring作为参数
MessageBox(0, str2.toStdWString().c_str(), L"中文标题",0);

//vs_cn_codec w;
//w.show();
return a.exec();
}