iconv로 인코딩 변한중인데, 빈 문자열이 되버립니다.

This is UTF-X Document.
이 문서는 UTF-X 문서입니다.
It's good. 

#include <iostream>
using namespace std;
#include <cstdio>
#include <iconv.h>
#include <cstring>
int main() {
	setlocale(LC_ALL,"ko_KR.UTF-8");
	FILE* fp=fopen("testdoc1.html","r");
	fseek(fp, 0, SEEK_END);
	size_t flength=ftell(fp);
	rewind(fp);
	char inbuff[1000];
	char outbuff[1000];
	memset(outbuff,0,sizeof(outbuff));	
	//char* buffer=new char[flength];
	//char * outbuffer=new char[flength];
	char* buffer=inbuff;
	char* outbuffer=outbuff;
	fread(buffer, 1, flength, fp);
	buffer[flength-1]=0;
cout<<buffer<<"  "<<flength<<endl;
	iconv_t cd=iconv_open("UTF-8","UTF-16LE");
 
	if(iconv(cd, &buffer, &flength, &outbuffer, &flength)==-1) {
		cout<<"iconv failed."<<endl;
	}
	else {
		cout<<"iconv success."<<endl;
	}
 
	outbuffer[flength-1]=0;
	cout<<outbuffer<<endl;//여기에서 확인해보면 빈 문자열입니다.
	cout<<strlen(outbuffer)<<endl;
	iconv_close(cd);
	//delete[] buffer;
	//delete[] outbuffer;
 
	return 0;
}