convert.h

vc编写的

/*
 Copyright (c) 1999, Elixir Studio  
 Author: Konstantin Bukreev 
 E-mail: [e-mail] 

 Created: 18.08.99 16:06:48
 Version: 1.0.1

 Description: converts and copies wchar_t string to char string and back
*/

#ifndef _convert_e4b9ff2d_556c_11d3_9283_0080adb811c5
#define _convert_e4b9ff2d_556c_11d3_9283_0080adb811c5

#if _MSC_VER > 1000 
#pragma once
#endif // _MSC_VER > 1000

namespace _ex_util
{
struct _convert
{	
	template <class _Ch> static HRESULT make (const _Ch* out, const char* in, int size_out); 
	template <class _Ch> static HRESULT make (const _Ch* to, const wchar_t* from, int size_out);

	//Instantiation
	template<> static HRESULT make (const char* out, const char* in, int size_out) 
	{
		__try{ memcpy((void*)out, (void*)in, min(size_out, lstrlenA(in)));}
		__except(1) {return E_UNEXPECTED;}
		return S_OK;
	}

	template<> static HRESULT make (const wchar_t* out, const wchar_t* in, int size_out)
	{
		__try {memcpy((void*)out, (void*)in, min((size_out * sizeof wchar_t), (lstrlenW(in) * sizeof wchar_t)));}
		__except(1) {return E_UNEXPECTED;}
		return S_OK;
	}

	template<> static HRESULT make (const wchar_t* out, const char* in, int size_out) 
	{
		int res = 0;
		__try { res = MultiByteToWideChar(CP_ACP, 0, in, lstrlenA(in), (wchar_t*)out, size_out);}
		__except(1) {return E_UNEXPECTED;}
		return res != 0 ? S_OK : E_FAIL;
	}	

	template<> static HRESULT make (const char* out, const wchar_t* in, int size_out) 
	{
		int res = 0;
		__try {res = WideCharToMultiByte(CP_ACP, 0, in, lstrlenW(in), (char*)out, size_out, 0, 0);}
		__except(1) {return E_UNEXPECTED;}
		return res != 0 ? S_OK : E_FAIL;
	}

	static int _strlen (wchar_t* str) {return lstrlenW(str);}
	static int _strlen (char*  str)   {return lstrlenA(str);}
};
}
#endif //_convert_e4b9ff2d_556c_11d3_9283_0080adb811c5