UTF-8 和 CString 互相转换

#include "stdafx.h"
#include 
#include  // for CString

#include 
#include 
using namespace std;

char* CreateUTF8TextInitWithString(CString strValue)
{
	char *buffer = NULL;
	int  length;

#ifdef _UNICODE
	length = WideCharToMultiByte(CP_UTF8, 0, strValue, -1, NULL, 0, NULL, NULL);
#else
	return NULL;
#endif
	if (length <= 0)
	{
		return NULL;
	}

	buffer = new char[length];
	if (buffer == NULL)
	{
		return NULL;
	}

	ZeroMemory(buffer, length);

#ifdef _UNICODE
	WideCharToMultiByte(CP_UTF8, 0, strValue, -1, buffer, length, NULL, NULL);
#else
	strcpy_s(buffer, length, strValue);
#endif

	return buffer;
}


BOOL CreateString_InitWithUTF8Text(CString& str, char* pUTF8Text)
{
	if (NULL == pUTF8Text)
	{
		return FALSE;
	}

	int  unicodeLen = ::MultiByteToWideChar( CP_UTF8,
		0,
		pUTF8Text,
		-1,
		NULL,
		0 ); 

	wchar_t*  pUnicode = new  wchar_t[unicodeLen+1];
	if (NULL == pUnicode)
	{
		return FALSE;
	}

	MultiByteToWideChar( CP_UTF8, 0, pUTF8Text, -1, (LPWSTR)pUnicode, unicodeLen );

	str = pUnicode;

	delete []pUnicode;
	return TRUE;
}


int _tmain()
{
	// 转换 CString 到 utf-8编码
	char* buff = CreateUTF8TextInitWithString(CString(TEXT("这都不是问题吧。"))); 

	// 转换 utf-8 到 CString 编码
	CString str;
	if (CreateString_InitWithUTF8Text(str, buff))
	{
		cout << "successed... ";
	}

	delete []buff;
	return 0;
}