c++编码及读写文件

写文件

#include <fstream>
#include <iostream>
using namespace std;

int main()
{   
    ofstream outfile("1.txt",ios::ate);   //打开文件，设置写入方式为覆盖写入

    if(!outfile)
    {
        cout<<"txt文件打开失败!"<<endl;
        exit(0);
    }

    outfile<<"写入txt文件示例.
";
    outfile<<"成功写入.
";

    outfile.close();
}

　　读文件并转码

#include <fstream>
#include <iostream>
#include <Windows.h>
#include <string>
using namespace std;

string UTF8ToGB(const char* str)
{
     string result;
     WCHAR *strSrc;
     LPSTR szRes;

     //获得临时变量的大小
     int i = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
     strSrc = new WCHAR[i+1];
     MultiByteToWideChar(CP_UTF8, 0, str, -1, strSrc, i);

     //获得临时变量的大小
     i = WideCharToMultiByte(CP_ACP, 0, strSrc, -1, NULL, 0, NULL, NULL);
     szRes = new CHAR[i+1];
     WideCharToMultiByte(CP_ACP, 0, strSrc, -1, szRes, i, NULL, NULL);

     result = szRes;
     delete []strSrc;
     delete []szRes;

     return result;
}

int main()
{
    char txt[100];
    string msg;
    ifstream infile;
    infile.open("1.txt");

    if(!infile.is_open())
    {
        cout<<""<<endl;
        exit(0);
    }

    while(!infile.eof())
    {
        infile.getline(txt,100);
        msg=UTF8ToGB(txt);
        cout<<msg<<endl;

    }

    infile.close();
    getchar();
}

C++中文乱码解决

#include<iostream>
#include <string>
#include <Windows.h>
using namespace std;
string UTF8ToGB(const char* str)
{
     string result;
     WCHAR *strSrc;
     LPSTR szRes;

     //获得临时变量的大小
     int i = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
     strSrc = new WCHAR[i+1];
     MultiByteToWideChar(CP_UTF8, 0, str, -1, strSrc, i);

     //获得临时变量的大小
     i = WideCharToMultiByte(CP_ACP, 0, strSrc, -1, NULL, 0, NULL, NULL);
     szRes = new CHAR[i+1];
     WideCharToMultiByte(CP_ACP, 0, strSrc, -1, szRes, i, NULL, NULL);

     result = szRes;
     delete []strSrc;
     delete []szRes;

     return result;
}

string msg;

int main ()
{
    const char txt[10] = "哈哈哈";
    msg=UTF8ToGB(txt);
    cout<<msg<<endl;

  return 0;
}