字符编码转换

案例一：C++里流文件读取字符串时产生的各种不确定编码问题

wstring strFilePath;
strFilePath = strResourcePath + _T("lang\\") + FindFileData.cFileName;

ifstream OpenFile(strFilePath);
if(OpenFile.fail()) continue;

在流文件读取的时候，编码转换很容易出错，解决方法就是不要使用这种办法读取

案例二：编码具体转换

wstring CSettingCenter::UTF8ToGB(const char * strText)
{
	string result;
	WCHAR *strSrc;
	LPSTR szRes;

	//获得临时变量的大小
	int i = MultiByteToWideChar(CP_UTF8, 0, strText, -1, NULL, 0);
	strSrc = new WCHAR[i + 1];
	MultiByteToWideChar(CP_UTF8, 0, strText, -1, strSrc, i);

	//获得临时变量的大小
	i = WideCharToMultiByte(CP_ACP, 0, strSrc, -1, NULL, 0, NULL, NULL);
	szRes = new CHAR[i + 1];
	WideCharToMultiByte(CP_ACP, 0, strSrc, -1, szRes, i, NULL, NULL);

	result = szRes;
	delete[]strSrc;
	delete[]szRes;

	return (CA2W)result.c_str();
}

此方法转换过程中比较繁杂 

案例三 ：最好的解决办法CA2WEX<>(sep, CP_UTF8)转

strFilePath = CPaintManagerUI::GetResourcePath() + _T("lang\\") + FindFileData.cFileName;

		HANDLE hFile = ::CreateFileW(strFilePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
		if (hFile == INVALID_HANDLE_VALUE)
		{
			break;
		}

		DWORD dwSize = ::GetFileSize(hFile, NULL);
		if (!dwSize)
		{
			CloseHandle(hFile);
			break;
		}
		pLanguageData = new CHAR[dwSize + 1];
		DWORD dwRead = 0;
		::ReadFile(hFile, pLanguageData, dwSize, &dwRead, NULL);
		dwLanguageDataSize = dwRead;
		CloseHandle(hFile);

		vector<wstring> vctText;
		vctTemp.clear();

		if (!pLanguageData) return;

		char* next_start = pLanguageData;
		
		char* start = next_start;
		char* end = strchr(start, '\n');
		if (end)
		{
			*end = 0;
		}

		char* sep = strchr(start, '=');
		if (!sep)
		{
			continue;
		}
		*sep = 0;
		sep++;
		
		wstring value = CA2WEX<>(sep, CP_UTF8);

案例四 用C语言发FILE fopen打开问文件，或者MFC的CFile方法打开

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