ConnectToTCPServerEx

[momo2013]

Hello,

We have some issues for using ConnectToTCPServerEx function.

Issue : When I called "ConnectToTCPServerEx function", sometime it looks ignoring to call the callback function"ReadCallback". Could it happen if I call ConnectToTCPServerEx function several times in a few minutes?

I mean I did connect, disconnect, conect, disconnect , connect and disconnect and etc. I have set the communication handle to 0(zeron) when the case is TCP_DISCONNECT.

Do you have any known issues or any advice when we call  ConnectToTCPServerEx while keep changing connections?

Thank you so much,

momo

In the "ReadData":

ReadData() {

...

ConnectToTCPServerEx (&hGrRead,ReadPort, GRipAddress, ReadCallback, 0, 0, TCP_ANY_LOCAL_PORT)

...

}

In the "ReadCallback":

ReadCallback() {

...

  case TCP_DATAREADY:

            if((error = ClientTCPRead (handle,header,28, 0)) < 1){
            return -1;
   }

......

  case TCP_DISCONNECT:
   if (handle > 0)
    handle =0;
    break;

}

[momo2013]

Hello,

It looked like my simulator which has heavily SNMP function has issues.

If I gave some delay before calling the callback function(includes ConnectToTCPServerEx), it is working.

Does anybody have the similar issue or experience?

Thank you,

Insuk

---

@momo2013 wrote:

Hello,

We have some issues for using ConnectToTCPServerEx function.

Issue : When I called "ConnectToTCPServerEx function", sometime it looks ignoring to call the callback function"ReadCallback". Could it happen if I call ConnectToTCPServerEx function several times in a few minutes?

I mean I did connect, disconnect, conect, disconnect , connect and disconnect and etc. I have set the communication handle to 0(zeron) when the case is TCP_DISCONNECT.

Do you have any known issues or any advice when we call  ConnectToTCPServerEx while keep changing connections?

Thank you so much,

momo

In the "ReadData":

ReadData() {

...

ConnectToTCPServerEx (&hGrRead,ReadPort, GRipAddress, ReadCallback, 0, 0, TCP_ANY_LOCAL_PORT)

...

}

In the "ReadCallback":

ReadCallback() {

...

  case TCP_DATAREADY:

            if((error = ClientTCPRead (handle,header,28, 0)) < 1){
            return -1;
   }

......

  case TCP_DISCONNECT:
   if (handle > 0)
    handle =0;
    break;

}

---

[TBirkulosis]

In what way are you calling the callback? Usually a callback will run when an event occurs, so they don't need to be directly called. When you say the callback is ignored, are you missing complete messages (data or packages) or only parts of messages from the TCPServer? CVI actually ships with a TCP/IP example that you could look at. On Windows 7, it is located at: C:\Users\Public\Documents\National Instruments\CVI2013\samples\tcp. Unfortunately, I'm not familiar with SNMP, so I don't know if there is a delay associated with communication.