php 调用 C++ dll,该怎么处理

<br />extern "C" int __stdcall GameRegister(char* szSystemInfo, char *szRegCode, char *szLicense);<br />

<br /><?php<br />                $dw = new Com("DynamicWrapper");<br />				$dw->Register("EducationGameRegister.dll", "GameRegister", 'i=sss', "f=s", "r=u"); <br />				<br />				$reg_code = "";<br />				$ch = $dw->GameRegister("P2G9YFWGZW68G","2597367cea95b2cf0aace3bd5059c33e",&$reg_code);<br />				<br />				echo "Return Value：".$ch;<br />				echo "Register Code：".$reg_code;	<br />            ?><br />