Unix下UTF-8和GB2312互相转换的函数[转]

   在windows下进行utf-8和gb2312相互转化的代码网上流传了很广了,因为实现里面使用了两个windows函数(WideCharToMultiByte 和 MultiByteToWideChar)，在Unix下编程就没有办法使用了，上网google研究了下，发现在Unix下就是对库功能的调用，非常简便。
    详细的信息，可以man 3 iconv查看，这里列出我写的一个演示程序。

 

#include<iostream>
#include<iconv.h>

using namespace std;


int utf8togb2312(const char *sourcebuf,size_t sourcelen,char *destbuf,size_t destlen)
{
  iconv_t cd;
  if( (cd = iconv_open("gb2312","utf-8")) ==0 )
    return -1;
  memset(destbuf,0,destlen);
  const char **source = &sourcebuf;
  char **dest = &destbuf;

  if(-1 == iconv(cd,source,&sourcelen,dest,&destlen))
    return -1;
  iconv_close(cd);
  return 0;
  
}

int gb2312toutf8(const char *sourcebuf,size_t sourcelen,char *destbuf,size_t destlen)
{
  iconv_t cd;
  if( (cd = iconv_open("utf-8","gb2312")) ==0 )
    return -1;
  memset(destbuf,0,destlen);
  const char **source = &sourcebuf;
  char **dest = &destbuf;

  if(-1 == iconv(cd,source,&sourcelen,dest,&destlen))
    return -1;
  iconv_close(cd);
  return 0;
  
}

int main()
{
  FILE *fp = fopen("love.txt","r");
  if(fp == NULL)
    {
      cout << "open file faiulre" << endl;
      return 1;
    }
  char line[80];
  memset(line,0,80);
  if( NULL == fgets(line,80,fp))
    {
      cout << "read file failure" << endl;
      return 2;
    }

  char dest_gb2312[80];

  utf8togb2312(line,strlen(line),dest_gb2312,80);
  cout << "before convert(utf-8): " << line << endl;
  cout << "after convert(gb2312): " << dest_gb2312 << endl;

  cout << endl << endl;
  char dest_utf8[80];
  gb2312toutf8(dest_gb2312,strlen(dest_gb2312),dest_utf8,80);
  cout << "before convert(gb2312)" << dest_gb2312 << endl;
  cout << "after convert(utf-8)" << dest_utf8 << endl;

    return 0;
}