iconv 函数字符编码转换

#include <iconv.h>
iconv函数族有三个函数,原型如下:
(1) iconv_t iconv_open(const char *tocode, const char *fromcode);
此函数说明将要进行哪两种编码的转换,tocode是目标编码,fromcode是原编码,该函数返回一个转换句柄,供以下两个函数使用。
(2) size_t iconv(iconv_t cd,char **inbuf,size_t *inbytesleft,char **outbuf,size_t *outbytesleft);
此函数从inbuf中读取字符,转换后输出到outbuf中,inbytesleft用以记录还未转换的字符数,outbytesleft用以记录输出缓冲的剩余空间。 (3) int iconv_close(iconv_t cd);
此函数用于关闭转换句柄,释放资源。

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#include <iconv.h>
#define OUTLEN 255

//代码转换:从一种编码转为另一种编码
int code_convert (char *from_charset, char *to_charset, char *inbuf, int inlen,
              char *outbuf, int outlen)
{
    iconv_t cd;
    int rc;
    char **pin = &inbuf;
    char **pout = &outbuf;

    cd = iconv_open (to_charset, from_charset);
    if (cd == 0)
        return -1;
    memset (outbuf, 0, outlen);
    if (iconv (cd, pin, &inlen, pout, &outlen) == -1)
        return -1;
    iconv_close (cd);
    return 0;
}

//UNICODE码转为GB2312码
int u2g (char *inbuf, int inlen, char *outbuf, int outlen)
{
    return code_convert ("utf-8", "gb2312", inbuf, inlen, outbuf, outlen);
}

//GB2312码转为UNICODE码
int g2u (char *inbuf, size_t inlen, char *outbuf, size_t outlen)
{
    return code_convert ("gb2312", "utf-8", inbuf, inlen, outbuf, outlen);
}
int main ()
{
    char *in_utf8 = "姝ｅ?ㄥ??瑁?";
    char *in_gb2312 = "正在安装";
    char out[OUTLEN];

    int rc;
//unicode码转为gb2312码
    rc = u2g (in_utf8, strlen (in_utf8), out, OUTLEN);
    printf ("unicode-->gb2312 out=%s/n", out);
//gb2312码转为unicode码
    rc = g2u (in_gb2312, strlen (in_gb2312), out, OUTLEN);
    printf ("gb2312-->unicode out=%s/n", out);
}

 

 

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c++

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

#define OUTLEN 255

using namespace std;

// 代码转换操作类
class CodeConverter
{
  private:
    iconv_t cd;
  public:
// 构造
    CodeConverter (const char *from_charset, const char *to_charset)
    {
        cd = iconv_open (to_charset, from_charset);
    }

// 析构
     ~CodeConverter ()
    {
        iconv_close (cd);
    }

// 转换输出
    int convert (char *inbuf, int inlen, char *outbuf, int outlen)
    {
        char **pin = &inbuf;
        char **pout = &outbuf;

        memset (outbuf, 0, outlen);
        return iconv (cd, pin, (size_t *) & inlen, pout, (size_t *) & outlen);
    }
};

int main (int argc, char **argv)
{
    char *in_utf8 = "姝ｅ?ㄥ??瑁?";
    char *in_gb2312 = "正在安装";
    char out[OUTLEN];

// utf-8-->gb2312
    CodeConverter cc = CodeConverter ("utf-8", "gb2312");
    cc.convert (in_utf8, strlen (in_utf8), out, OUTLEN);
    cout << "utf-8-->gb2312 in=" << in_utf8 << ",out=" << out << endl;

// gb2312-->utf-8
    CodeConverter cc2 = CodeConverter ("gb2312", "utf-8");
    cc2.convert (in_gb2312, strlen (in_gb2312), out, OUTLEN);
    cout << "--gb2312-->utf-8 in=" << in_gb2312 << ",out=" << out << endl;
}