/**
* 下载对账单
* @param WxPayDownloadBill $inputObj
* @param int $timeOut
* @throws WxPayException
* @return 成功时返回，其他抛异常
*/
public static function downloadBill($inputObj, $timeOut = 6)
{
$url = "https://api.mch.weixin.qq.com/pay/downloadbill";
//检测必填参数
if (!$inputObj->IsBbill_dateSet()) {
throw new WxPayException("对账单接口中，缺少必填参数bill_date！");
}
$inputObj->SetAppid(WxPayConfig::APPID);
//公众账号ID
$inputObj->SetMch_id(WxPayConfig::MCHID);
//商户号
$inputObj->SetNonce_str(self::getNonceStr());
//随机字符串
$inputObj->SetSign();
//签名
$xml = $inputObj->ToXml();
$response = self::postXmlCurl($xml, $url, false, $timeOut);
if (substr($response, 0, 5) == "<xml>") {
return "";
}
return $response;
}
