用最土的方法将CString 转换成 int

用最土的方法将CString 转换成 int

1.

“E5”

2.

‘E’ = 69-55 = E (十六进制) = 14(十进制)x16 = 0xE0

3.

‘5’ = 53 - ‘0’(48) = 0x05

4.

0xE0 + 0x05 = 0xE5

unsigned int StrToInt(CString str)
{
	unsigned int a,b;
	signed short n,m,k;
	unsigned char c;

	a = b = 0;
	k = 0;
	for (n = str.GetLength(); n >0 ; n--)
	{
		c = str.GetAt(k);
		if ((c >= '0') && (c <= '9'))
		{
			b = c - '0';
			for (m = 1; m < n; m++)
			{
				b = b * 16;
			}
		}

		else if ((c >= 'a') && (c <= 'f'))
		{
			b = c - 87;
			for (m = 1; m < n; m++)
			{
				b = b * 16;
			}
		}

		else if ((c >= 'A') && (c <= 'F'))
		{
			b = c - 55;
			for (m = 1; m < n; m++)
			{
				b = b * 16;
			}
		}
		k++;
		a += b;
	}

	return a;
}