InternetGetConnectedState这个API如何调用?

[ghosert]

检测是否联网的API,为何编译出错?代码如下:
#include<windows.h>
#include<iostream.h>
#include<conio.h>
int main()
{
BOOL result;
result=InternetGetConnectedState(INTERNET_CONNECTION_MODEM,0);
cout<<result<<endl;
getch();
return 0;
}

[panda_w]

#include <afxinet.h>
库文件：wininet.lib

[sundayboys]

msdn上说的很清楚，
Header －－Wininet.h
Import library－－ Wininet.lib

[ghosert]

panda_w同志请问如何在MSDN里查到一个API需要的头文件和库文件,有时好象并没有说明

[ghosert]

MSDN上说了吗,我没看到啊

[sundayboys]

你看看这个吧（msdn）：
InternetGetConnectedState Function

--------------------------------------------------------------------------------

Retrieves the connected state of the local system.

Syntax

BOOL InternetGetConnectedState(
OUT LPDWORD lpdwFlags,
IN DWORD dwReserved
);

Parameters

lpdwFlags
Address of an unsigned long integer variable where the connection description should be returned. This can be a combination of the following values:
INTERNET_CONNECTION_CONFIGURED
Local system has a valid connection to the Internet, but it may or may not be currently connected.
INTERNET_CONNECTION_LAN
Local system uses a local area network to connect to the Internet.
INTERNET_CONNECTION_MODEM
Local system uses a modem to connect to the Internet.
INTERNET_CONNECTION_MODEM_BUSY
No longer used.
INTERNET_CONNECTION_OFFLINE
Local system is in offline mode.
INTERNET_CONNECTION_PROXY
Local system uses a proxy server to connect to the Internet.
INTERNET_RAS_INSTALLED
Local system has RAS installed.
dwReserved
Reserved. Must be set to zero.
Return Value

Returns TRUE if there is an Internet connection, or FALSE otherwise.

Function Information

Windows NT Use version 4.0. Implemented only as an ANSI function.
Windows Use Windows 95 and later. Implemented only as an ANSI function.
Header Wininet.h
Import library Wininet.lib
Minimum availability Internet Explorer 4.0


返回值中有个INTERNET_CONNECTION_OFFLINE 判断是不是离线的。

[ghosert]

敢问老弟的MSDN是什么时候的?怎么和我的不一样

[111222]

InternetGetConnectedState的第一个参数是个DWORD指针输出值，你不可以使其为INTERNET_CONNECTION_MODEM!!!


DWORD flags;//上网方式
BOOL m_bOnline；//是否在线

m_bOnline=InternetGetConnectedState(&flags,0);
if(m_bOnline)//在线
{
switch(&flags)
{
case INTERNET_CONNECTION_MODEM :
AfxMessageBox("在线：拨号上网");
break;
case INTERNET_CONNECTION_LAN :
AfxMessageBox("在线：通过局域网");
break;
case INTERNET_CONNECTION_PROXY :
AfxMessageBox("在线：代理");
break;
}
if(&flags==INTERNET_CONNECTION_MODEM_BUSY)
AfxMessageBox("MODEM被其他非INTERNET连接占用");
}
else
AfxMessageBox("不在线");

[ghosert]

谢谢111222的回答,但是为何我的InternetGetConnectedState(&flags,0);无论上网与否都等于true呢?