使用libiconv. 本文包括libiconv实用简单介绍及几个例子程序。

libiconv实用非常简单，只有3步：
 

1.使用 conv_t iconv_open (const char* tocode, const char* fromcode); 打开描述符。 fromcode和tocode为编码类型。conv_open的详细介绍看man iconv_open http://www.gnu.org/software/libi ... v/iconv_open.3.html
 

2.使用 size_t iconv (iconv_t cd, const char* * inbuf, size_t * inbytesleft, char* * outbuf, size_t * outbytesleft); 进行编码转换。详细介绍看man 3 iconv。 http://www.gnu.org/software/libi ... biconv/iconv.3.html
 

3.close.int iconv_close (iconv_t cd); http://www.gnu.org/software/libi ... /iconv_close.3.html 
以下是C++代码：【复制】 
/* lanconv.c - a simple example to convert GB2312 to UTF-8/BIG5 *
 * Author: zhou_weicheng at 163 dot com
 * Date: 2005/11/30
 */

#include stdio.h
#include stdlib.h
#include string.h
#include iconv.h
int main( int argc, char *argv[] )
{
	iconv_t cd;
	size_t	n, inlen, outlen;
	char	buf[1024];
	char	*in, *out;
/* cd = iconv_open("UTF-8", "GB2312"); */
	cd = iconv_open( "BIG5", "GB2312" );
	if ( cd == (iconv_t) -1 )
	{
		perror( "iconv_open" );
		exit( -1 );
	}
	in	= argv[1];
	out	= buf;
	inlen	= strlen( in );
	outlen	= sizeof(buf);
	n	= iconv( cd, &in, &inlen, &out, &outlen );
	if ( n == -1 )
	{
		perror( "iconv" );
		exit( -1 );
	}
	printf( "%s ", buf ); iconv_close( cd );
	exit( 0 );
}



以下是C++代码：【复制】 
#include stdio.h
#include string.h
#include iconv.h
int main( int argc, char **argv )
{
	FILE	*fin, *fout; char *encFrom, *encTo;
	char	bufin[1024], bufout[1024], *sin, *sout; int mode, lenin, lenout, ret, nline;
	iconv_t c_pt;
	if ( argc != 5 )
	{
		printf( "Usage: a.out " );
		return(0);
	}
	encFrom = argv[1];
	encTo	= argv[2];
	if ( (fin = fopen( argv[3], "rt" ) ) == NULL )
	{
		printf( "Cannot open file: %s ", argv[3] );
		return(-1);
	}
	if ( (fout = fopen( argv[4], "wt" ) ) == NULL )
	{
		printf( "Cannot open file: %s ", argv[4] );
		return(-1);
	}
	if ( (c_pt = iconv_open( encTo, encFrom ) ) == (iconv_t) -1 )
	{
		printf( "iconv_open false: %s ==> %s ", encFrom, encTo );
		return(-1);
	}
	iconv( c_pt, NULL, NULL, NULL, NULL );
	nline = 0;
	while ( fgets( bufin, 1024, fin ) != NULL )
	{
		nline++;
		lenin	= strlen( bufin ) + 1;
		lenout	= 1024;
		sin	= bufin;
		sout	= bufout;
		ret	= iconv( c_pt, &sin, &lenin, &sout, &lenout );
		printf( "%s -> %s: %d: ret=%d, len_in=%d, len_out=%d ", encFrom, encTo, nline, ret, lenin, lenout );
		if ( ret == -1 )
		{
			printf( "stop at: %s ", sin );
			break;
		}
		fprintf( fout, "%s", bufout );
	}
	iconv_close( c_pt );
	fclose( fin );
	fclose( fout );
	return(0);
}