tuf8和gb2312编码转换

qt界面默认是utf8，Vs是gb2312，所以会有乱码，所以在输入时，将gb2312转换为utf8，用setWindowsTitle示例，直接输入中文，qt界面就会乱码，经过转换后的返回值输入就不会再乱码了

#include  <qtextcodec.h>
#include <string>
构造函数
{
    ui.setupUi(this);

std::string temp("模板方法");

    char str[10] = {0};
   setWindowTitle(TemplateMethod::Gb2312_utf8(temp, str));
}

char *  TemplateMethod::Gb2312_utf8(std::string strutf8, char* str)
{
    //头文件QTextCodec
    QTextCodec* utf8Codec = QTextCodec::codecForName("utf-8");
    QTextCodec* gb2312Codec = QTextCodec::codecForName("gb2312");

    QString strUnicode = gb2312Codec->toUnicode(strutf8.c_str());
    QByteArray ByteUtf8 = utf8Codec->fromUnicode(strUnicode);

    strcpy(str, ByteUtf8.data());
    return str;
}

char* TemplateMethod::utf8_Gb2312(std::string strgb2312, char* str)
{
    QTextCodec* utf8Codec = QTextCodec::codecForName("utf-8");
    QTextCodec* gb2312Codec = QTextCodec::codecForName("gb2312");

    QString strUnicode = utf8Codec->toUnicode(strgb2312.c_str());
    QByteArray ByteGb2312 = gb2312Codec->fromUnicode(strUnicode);

    strcpy(str, ByteGb2312.data());
    return str;
}