Persistence of objects called from C screws

In my first case, I have a single VI compiled into a DLL. This VI carries three different operations, according to the function call:

It is the first operation. It opens a connection to a UDP stream server. 'ID' and 'SA' are commands to tell the server to start to send UDP data. The function call is:

Legend (int Func, char * address, float * DataOut, int Len);

Func is the operation that I want to make address is the IP address on the server, DataOut is a container for data is returned and Len is the size of the container.

To start to receive data, I write:

Legend (1, addr, data, 5000);

DataOut is ignored in this case. To retrieve the UDP packets, the following is used:

The call is:

Legend (2, addr, data, 5000);

In this case, the address is not used. 5000 bytes of data is copied to the location where the data points.

And finally, to close the stream of this operation:

Legend (3, addr, data, 5000);

'SC' is the command to close the stream.

The above steps work very well. The State of the VI is persistent between function calls, and the connection in the connection ID can be used all the time.

What I'm trying to do now is to streamline operations by dividing this VI in three separate screws the first operation now looks like this:

In this case, I'm trying to save the pointers to relevant objects in my C code:

TD1 * error;
LVRefNum * connectionid;

The new function call is:

callout_connect (addr, login ID, error);

The next VI becomes:

With the function call:

callout_receive (connection, error, data ID, 5000);

And finally:

With the function call:

callout_close (addr, login ID, error);

Needless to say, split the VI in three separate entities has not worked so far. It compiles, implements a connection, but somewhere the connection is lost.

My suspicion is that I'm not understanding how the reference of the connection or the pointer to this reference is saved. Any suggestions?

> Never make myself, I would say the problem is that you are passing a pointer that points to nothing and say LV to fill. This would probably cause your app to crash.

It was something I knew well too, but it didn't crash. It's okay, I solved it by putting connection and error objects in global variables. It works fine now and seems to be the most elegant solution.

Tags: NI Software

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