常规的转换函数，无法去除多余的0。

CString doubleToCString(double data)
{
	CString strData;
	//判断数据是否小于0.000
	if (data < 0.0009) {
		strData = _T("0");
	}
	else
	{
		strData.Format(_T("%.3f"), data);
	}

	//去除字符串后面的0
	for (int i = strData.GetLength() - 1; i > 0; i--) {
		if (strData[i] == '0') {
			strData.Delete(i, 1);
			continue;
		}
		else if (strData[i] == '.') {
			strData.Delete(i, 1);
			break;
		}
		else {
			break;
		}
	}
	return strData;
}

double CStringToDouble(CString data)
{
	double dData;
	//判断字符串开通是否为0
	CString temp = data;
	while(1) {
		if (temp[0] != '0') {
			break;
		}
		if (temp.GetLength() == 0) {
			break;
		}
		temp.Delete(0, 1);//删除当前字符串第一个为0的字符
	}
	//去除字符串后面的0
	for (int i = temp.GetLength() - 1; i > 0; i--) {
		if (temp[i] == '0') {
			temp.Delete(i, 1);
			continue;
		}else if(temp[i] == '.'){
			temp.Delete(i, 1);
			break;
		}
		else {
			break;
		}
	}

	//判断字符串是否为
	if (temp.IsEmpty()) {
		dData = 0.000;
		return dData;
	}

	if (temp != temp.SpanIncluding(_T(".0123456789"))) {
		dData = 0.000;
		return dData;
	}
	dData = _ttof(data);
	return dData;
}