STRING转WCHAR 和WCHAR 转STRING

// testvsprintf.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include 
#include 
#include 

// wchar_t to string
void Wchar_tToString(std::string& szDst, wchar_t *wchar)
{
wchar_t * wText = wchar;
DWORD dwNum = WideCharToMultiByte(CP_OEMCP,NULL,wText,-1,NULL,0,NULL,FALSE);// WideCharToMultiByte的运用
char *psText; // psText为char*的临时数组，作为赋值给std::string的中间变量
psText = new char[dwNum];
WideCharToMultiByte (CP_OEMCP,NULL,wText,-1,psText,dwNum,NULL,FALSE);// WideCharToMultiByte的再次运用
szDst = psText;// std::string赋值
delete []psText;// psText的清除
}

// string to wstring
void StringToWstring(std::wstring& szDst, std::string str)
{
	std::string temp = str;
	int len=MultiByteToWideChar(CP_ACP, 0, (LPCSTR)temp.c_str(), -1, NULL,0); 
	wchar_t * wszUtf8 = new wchar_t[len+1]; 
	memset(wszUtf8, 0, len * 2 + 2); 
	MultiByteToWideChar(CP_ACP, 0, (LPCSTR)temp.c_str(), -1, (LPWSTR)wszUtf8, len);
	szDst = wszUtf8;
	std::wstring r = wszUtf8;
	delete[] wszUtf8;
}



int main(int argc, char *argv)
{
 	setlocale(LC_ALL,"Chinese-simplified");
 	// string to wstring
 	std::string szSrc = "字符串转换宽字符实例!OK!";
 	std::wstring wszDest;
 	StringToWstring(wszDest, szSrc);
 	std::wcout << "wszDest: " << wszDest << std::endl;

		
}