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.\n";
    outfile<<"成功写入.\n";

    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, , str, -, NULL, );
      strSrc = new WCHAR[i+];
      MultiByteToWideChar(CP_UTF8, , str, -, strSrc, i);

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

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

      return result;
 }

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

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

     while(!infile.eof())
     {
         infile.getline(txt,);
         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, , str, -, NULL, );
      strSrc = new WCHAR[i+];
      MultiByteToWideChar(CP_UTF8, , str, -, strSrc, i);

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

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

      return result;
 }

 string msg;

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

   return ;
 }