各个进制间的转换

//将16进制的一个字符转换为十进制的数
unsigned char CConvNumsDlg::BtoH(char ch)
{
	//0-9
	if (ch >= '0' && ch <= '9') 
		return (ch - '0');         

	//9-15
	if (ch >= 'A' && ch <= 'F') 
		return (ch - 'A' + 0xA);   

	//9-15
	if (ch >= 'a' && ch <= 'f')
		return (ch - 'a' + 0xA);  
	return(255); 
}

//转换十六进制为二进制
CString CConvNumsDlg::HexToBinary(CString strHex)
{
	int nLenth = strHex.GetLength();
	char* Hex = new char[nLenth];
	Hex = strHex.GetBuffer(0);
	CString strBinary = "";
	for(int i=0;i<nLenth;i++)
	{
		//转换一位十六进制数为十进制
		char h = Hex[nLenth-1-i];
		int j = BtoH(h);
		CString str;
		str.Format("%d",j);

		//转换十进制为4为二进制
		str = DecimalToBinary(str);
		strBinary += str;
	}
	return strBinary;
}

//转换二进制为十六进制
CString CConvNumsDlg::BinaryToHex(CString strBinary)
{
	int nLength = strBinary.GetLength();
	CString str = strBinary;
	//位数不是四的倍数时补齐
	switch(nLength%4)
	{
	case 0:
		break;
	case 1:
		strBinary.Format("%d%d%d%s",0,0,0,str);
		break;
	case 2:
		strBinary.Format("%d%d%s",0,0,str);
		break;
	case 3:
		strBinary.Format("%d%s",0,str);
		break;
	default:
		return "";
		break;
	}

	CString strHex,str1;
	str1 = "";
	nLength = strBinary.GetLength();
	for(int i=1;i<=(nLength/4);i++)
	{
		//每四位二进制数转换为一十六进制数
		str = strBinary.Left(4);
		CString strDecimal = BinaryToDecimal(str);
		int nDecimal = atoi(strDecimal.GetBuffer(0));
		if(nDecimal<10)
			str1.Format("%d",nDecimal);
		else
		{
			char c = 'A' + (nDecimal-10);
			str1.Format("%c",c);
		}
		strHex += str1;
		strBinary = strBinary.Right(strBinary.GetLength()-str.GetLength());
	}
	return strHex;
}

//转换十进制为二进制
CString CConvNumsDlg::DecimalToBinary(CString strDecimal)
{
	int nDecimal = atoi(strDecimal.GetBuffer(0));

	int nYushu;	//余数
	int nShang;	//商
	CString strBinary = "";
	char buff[2];
	CString str = "";
	BOOL bContinue = TRUE;
	while(bContinue)
	{
		nYushu = nDecimal%2;
		nShang = nDecimal/2;
		sprintf(buff,"%d",nYushu);
		str = strBinary;
		strBinary.Format("%s%s",buff,str);
		nDecimal = nShang;
		if(nShang==0)
			bContinue = FALSE;
	}
	return strBinary;
}

//转换二进制为十进制
CString CConvNumsDlg::BinaryToDecimal(CString strBinary)
{
	int nLenth = strBinary.GetLength();
	char* Binary = new char[nLenth];
	Binary = strBinary.GetBuffer(0);
	int nDecimal = 0;
	for(int i=0;i<nLenth;i++)
	{
		char h = Binary[nLenth-1-i];
		char str[1];
		str[0] = h;
		int j = atoi(str);
		for(int k=0;k<i;k++)
		{
			j=j*2;
		}
		nDecimal += j;
	}
	CString strDecimal;

	strDecimal.Format("%d",nDecimal);
	return strDecimal;
}