PC to PC USB communication

问题

How can I communicate between two PC's via USB? I want a program to send numbers trough the USB port to another PC on which another program would show these numbers. I have the feeling that this is impossible because PC's are meant to be hosts and not devices, but is USB truly this limited? I actually hate that USB is not like a COM port which just has an input buffer and an output buffer. You send and receive with ease. I looked at libusb and I could use it, but I can't find a way to make one PC a device. So is it even possible?

回答1:

I can't find a way to make one PC a device. So is it even possible?

No, this is not possible on a PC. USB communicates always Host->Device, and PC is always Host. You can buy a special USB2USB cable, this has a chip in the middle that communicates as device on both ends.

But I would just use a LAN cable. Every PC I know comes with Ethernet these days. TCP/IP is not too hard to use.

回答2:

If you like serial ports so much, you should just get a USB-to-serial adapter for each computer and then wire them together. These devices create a virtual COM port on your computer and you can use it the same way you would use a normal COM port.

回答3:

You need to have an USB data transfer cable (also called USB data link cable) which support API or SDK, then use the following code. Communication speed much faster than using WinSock(TCP/IP) over USB or serial port over USB. USB2.0 communication speed is 480Mbps, effective data communication speeds greater than 100Mbps, and can isolate viruses and network attacks.

void CU2uDlg::OnOK() 
{
BYTE        buf[65530];
LPU2URET    pU2uRet;
BOOL        bRet;
int         ret;
CString     msgstr;

ret = u2u_open();
if (ret == -1){
    AfxMessageBox("Open U2U device Success.");
}else{
    msgstr.Format("Open U2U device fail，return：%d", ret);
    AfxMessageBox(msgstr);
    return;
}

//send data
bRet = u2u_SendData(buf, 65530, ret);
if(!bRet)
{
    msgstr.Format("Send data error，return：%d", ret);
    AfxMessageBox(msgstr);
    return;
}

//receive data
while (1){
    bRet = u2u_RecvData(recvData, dataLen, ret);
    if( !bRet )
    {
        msgstr.Format("Receive data error，return：%d", ret);
        AfxMessageBox(msgstr);
        u2u_close();
        return;
    }else{
        break;
    }
}
u2u_close();


}

See: Reference1, Reference2

来源：https://stackoverflow.com/questions/9317823/pc-to-pc-usb-communication

标签

usb

communication