WiFi Openhandle里的一段程序（在线等待求助）

[benbenlover1985]

//Native WiFi Initialization
//WiFi: Open Handle
DWORD dNegotiatedVersion = 0;
HANDLE hClientHandle = NULL;
DWORD rtn;
int ndx = 0;

rtn = WlanOpenHandle(dClientVersion, NULL, &dNegotiatedVersion, &hClientHandle);
if(rtn != ERROR_SUCCESS)
{
AfxMessageBox(_T("Error occured in WlanOpenHandle!"));
return FALSE;
}

请问里面的变量rtn的作用是什么，也即WlanOpenHandle函数的作用？
什么情况下if语句才满足条件，然后输出"Error occured in WlanOpenHandle!"
这是一个天线选择程序里的一段，刚开始在XP系统下运行，能顺利！换到win 7系统下，运行结果就是上面的输出："Error occured in WlanOpenHandle!"
望高手指点！

[The_Only_Name_2]

rtn的作用保存WlanOpenHandle函数的返回值，

WlanOpenHandle的作用是打开到一个服务的连接
//Native WiFi Initialization 
//WiFi: Open Handle 
DWORD dNegotiatedVersion = 2; 
HANDLE hClientHandle = NULL; 
DWORD rtn; 
int ndx = 0; 

rtn = WlanOpenHandle(dClientVersion, NULL, &dNegotiatedVersion, &hClientHandle); 
if(rtn != ERROR_SUCCESS) 
    { 
        AfxMessageBox(_T("Error occured in WlanOpenHandle!")); 
        return FALSE; 
    } 

试一下

[blingpro]

查询一下返回值，看代码对应的错误问题是什么

gl