SendARP 相关错误

SendARP 31错误（连到系统上的设备没有发挥作用。 ）

SendARP 1784错误（提供给请求操作的用户缓冲区无效。 ）

unsigned char macAddress[6];

ULONG macAddLen = 6;

for( ; it != ControlDevices.end(); it++)

{

iRet=SendARP(it->DeviceAddr.GetIPAddr(), (unsigned long)NULL,(PULONG)&macAddress, &macAddLen);

}

改成

for( ; it != ControlDevices.end(); it++)

{

unsigned char macAddress[6];

ULONG macAddLen = 6;

iRet=SendARP(it->DeviceAddr.GetIPAddr(), (unsigned long)NULL,(PULONG)&macAddress, &macAddLen);

}

发送成功

应该是macAddress这个地方有错误，才会出现的

2008-11-23

SendARP 返回时间，测试代码时遇到SendARP 大约每隔1秒才会返回

具体代码，"......"里的代码不是很长，现在只能改用另外一种办法了，把SendARP换成消息，这样可以做到每隔一定的时间发送设备查询的消息

for( ; it != list.end(); it++)

{

if(it->m_device.DeviceState==0)

{

unsigned char macAddress[6];

ULONG macAddLen = 6;

memset( macAddress,0xff,sizeof( macAddress ) );

int iRet=SendARP(it->m_device.DeviceAddr.GetIPAddr(), (unsigned long)NULL,(PULONG)&macAddress, &macAddLen);

if( iRet == NO_ERROR )

{

.......

}

}

}