#include <iostream>#include <string>#include <fstream>#include <iconv.h>using namespace std;#PRagma comment(lib,"libIconv.lib")//編碼轉換，source_charset是源編碼，to_charset是目標編碼std::string code_convert(char *source_charset, char *to_charset, const std::string& sourceStr) //sourceStr是源編碼字符串{	iconv_t cd = iconv_open(to_charset, source_charset);//獲取轉換句柄，void*類型	if (cd == 0)		return "";    size_t inlen = sourceStr.size();	size_t outlen = 255;	char* inbuf = (char*)sourceStr.c_str();	char outbuf[255];//這里實在不知道需要多少個字節，這是個問題	//char *outbuf = new char[outlen]; 另外outbuf不能在堆上分配內存，否則轉換失敗，猜測跟iconv函數有關	memset(outbuf, 0, outlen);	char *poutbuf = outbuf; //多加這個轉換是為了避免iconv這個函數出現char(*)[255]類型的實參與char**類型的形參不兼容	if (iconv(cd, &inbuf, &inlen, &poutbuf,&outlen) == -1)		return "";    std::string strTemp(outbuf);//此時的strTemp為轉換編碼之后的字符串	iconv_close(cd);	return strTemp;}//gbk轉unicode,"UCS-2LE"代表unicode小端模式std::string GbkToUnicode(const std::string& strGbk)// 傳入的strGbk是GBK編碼 {	return code_convert("gb2312", "UCS-2LE",strGbk);}int main() {       ofstream out("b.txt");    unsigned char head[3] = {0xff,0xfe,0x00};//unicode文件頭,0x00必須加上    out << head ;    string str =GbkToUnicode("我") ;//"我"在vs文本編輯器里默認是gbk編碼，需要通過GbkToUnicode轉成Unicode編碼    out << str;    out.close();   	return 0;}
參照博客：Qt寫入unicode編碼格式的文本