C++ MFC中如何根据不同文件编码格式创建和写文本内容_mfc写文件

废话不多说，相信有点基础的应该都不难看懂下面的源码内容：

这里假设VC++的字符集编码格式是Unicode，要写入的文本内容是m_strTEXT

1、保存ANSI编码格式的文本文件

CStdioFile file;
if (file.Open(_T("ANSI编码格式文本文件.txt"), CFile::modeCreate | CFile::modeWrite | CFile::typeText)) {
	//UNICODE->ANSI
	USES_CONVERSION;
	CStringA ansiString = W2A(m_strTEXT);
	file.Write(ansiString, ansiString.GetLength());
	file.Close();
}

2、保存utf-8编码格式的文本文件

CStdioFile file;
if (file.Open(_T("utf8编码格式的文本文件.txt"), CFile::modeCreate | CFile::modeWrite | CFile::typeBinary)) {
	char head[] = { 0xEF, 0xBB, 0xBF};
	file.Write(head, 3);
 
	// 获取Unicode字符串的长度（以字符为单位）
	int unicodeLength = m_strTEXT.GetLength();
 
	// 获取UTF-8编码所需的缓冲区大小（以字节为单位）
	int utf8BufferSize = WideCharToMultiByte(CP_UTF8, 0, m_strTEXT, unicodeLength, NULL, 0, NULL, NULL);
 
	// 分配足够大的缓冲区来保存转换后的UTF-8字符串
	char* utf8Buffer = new char[utf8BufferSize + 1];
 
	// 将Unicode字符串转换为UTF-8编码
	WideCharToMultiByte(CP_UTF8, 0, m_strTEXT, unicodeLength, utf8Buffer, utf8BufferSize, NULL, NULL);
 
	// 确保UTF-8字符串以null结尾
	utf8Buffer[utf8BufferSize] = '\0';
			
	file.Write(utf8Buffer, utf8BufferSize);
	file.Close();
 
	// 释放内存
	delete[] utf8Buffer;
}

3、保存unicode-le编码格式的文本文件

CStdioFile file;
if (file.Open(_T("unicode-le编码格式的文本文件.txt"), CFile::modeCreate | CFile::modeWrite | CFile::typeBinary)) {
	//file
	char bom[] = {0xFF, 0xFE};
	file.Write(bom, 2);
 
	LPCTSTR lpszString = m_strTEXT.GetBuffer(0);
	m_csTEXT.ReleaseBuffer();
	int nLength = m_strTEXT.GetLength();
	for (int i = 0; i < nLength; i++)
	{
		wchar_t ch = lpszString[i];
 
		// 将每个字符转换为UTF-16编码
		unsigned char lowByte = ch & 0xFF;
		unsigned char highByte = (ch >> 8) & 0xFF;
		// 按照小字节序顺序写入文件
		file.Write(&lowByte, 1);
		file.Write(&highByte, 1);
	}
 
	file.Close();
}

4、保存unicode-be编码格式的文本文件

CStdioFile file;
if (file.Open(_T("unicode-be编码格式的文本文件.txt"), CFile::modeCreate | CFile::modeWrite | CFile::typeBinary)) {
	//file
	char bom[] = {0xFE, 0xFF};
	file.Write(bom, 2);
 
	LPCTSTR lpszString = m_strTEXT.GetBuffer(0);
	m_csTEXT.ReleaseBuffer();
	int nLength = m_strTEXT.GetLength();
	for (int i = 0; i < nLength; i++)
	{
		wchar_t ch = lpszString[i];
 
		// 将每个字符转换为UTF-16编码
		unsigned char lowByte = ch & 0xFF;
		unsigned char highByte = (ch >> 8) & 0xFF;
		// 按照小字节序顺序写入文件
		file.Write(&highByte, 1);
		file.Write(&lowByte, 1);
	}
 
	file.Close();
}