#include<iconv.h> #include <stdio.h>#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() { char line[80]; char dest_gb2312[200]; char dest_utf8[200]; int ret ; FILE *fp = fopen("love.txt","r"); if(fp == NULL) {  printf("oh my dear,open fail.../n");  return 1; } memset(line,0,80); if( NULL == fgets(line,80,fp)) {  printf("oh fgets fail.../n");  return 2; }printf( "----- :%s/n",line );ret = gb2312toutf8(line,strlen(line),dest_gb2312,200); // ret = gb2312toutf8(dest_gb2312,strlen(dest_gb2312),dest_utf8,80); printf( "ret=%d/n/n/n",ret); printf( "gb2312:%s/n",line ); printf( " utf-8:%s/n/n/n/n/n/n", dest_gb2312 ); ret = utf8togb2312(dest_gb2312,strlen(dest_gb2312),dest_utf8,200); printf( "ret=%d/n/n/n ",ret); printf( " utf-8:%s/n ",dest_gb2312); printf( "gb2312:%s/n ",dest_utf8); return 0;}