linux下iconv转码问题

大家好,下面是代码      ,iconv返回值为1  可是没有东西输出,原因是源指针输出的内容也为空,是什么原因呢?
C/C++ code:
#include <iostream>
#include <iconv.h>
using namespace std;

int main()
{
iconv_t iconv_tool;

iconv_tool = iconv_open("utf-8","gb2312");

cout << "iconv_open return value: " << iconv_tool << endl;

const size_t INLEN = 2;
const char in[INLEN] = {0xC4,0XE3};
char *in_utf8 = (char*)in;

const size_t OUTLEN = 256;
char *pout = new char[OUTLEN];

int ret = iconv(iconv_tool,&in_utf8,const_cast<size_t*>(&INLEN),&pout,const_cast<size_t*>(&OUTLEN));
cout << "iconv return value: "<< ret << endl;

cout << "src_utf8_in: " << in << endl; //输出 你
cout << "src_utf8_in_utf8: " << in_utf8 << endl; //输出空
cout << "dst_gb2312_pout: "<< pout << endl; //输出空

iconv_close(iconv_tool);

return 0;
}