Thread: MonkeyTalk w/ C# A ref or out argument must be an lvalue

Try just using the integer value instead, eg

string s = myMonkeyTalk.RetrieveLastNMEA(0);

where...

NMEA_GGA = 0
NMEA_GLL = 1
NMEA_RMC = 2

I had tried that. Then it doesn't think it is a valid argument:
Argument '1': cannot convert from 'ref int' to 'ref MonkeyTalk.NMEA_TYPES'

looks to me like that functions modifies it argument and therefor you need to pass a reference type. The argument type should be (ref MonkeyTalk.NMEA_TYPES). So you need to declare a variable of that type and then pass it by reference.

Maybe something like this pseudocode:

Dim msgType as new MonkeyTalk.NMEA_TYPES;
string s = myMonkeyTalk.RetrieveLastNMEA(ref msgType);
if msgType == NMEA_GGA then {
ProcessGGA(s)
}
else ...

Originally Posted by rando

looks to me like that functions modifies it argument and therefor you need to pass a reference type. The argument type should be (ref MonkeyTalk.NMEA_TYPES). So you need to declare a variable of that type and then pass it by reference.

Maybe something like this pseudocode:

Dim msgType as new MonkeyTalk.NMEA_TYPES;
string s = myMonkeyTalk.RetrieveLastNMEA(ref msgType);
if msgType == NMEA_GGA then {
ProcessGGA(s)
}
else ...

ahhhhh, Thank you soooooo much Rando. That compiled. I'll see if it all works when I get home. I'm sure it will all work though

Ok, this isn't working right.
So this code compiles and runs without exception:
MonkeyTalk.NMEA_TYPES nn = new MonkeyTalk.NMEA_RMC;
string s = myMonkeyTalk.RetrieveLastNMEA(ref nn);

Problem is, the only string this function returns is "Unknown NMEA String".
Any ideas?


EDIT:fixed one problem but I am still getting the same error.

hmmm...try another approach

string s = myMonkeyTalk.Custom("GetNMEA|RMC");

string s3 = "GetNMEA|RMC";
string s4 = "D3Request";
string s = myMonkeyTalk.Custom(ref s3, ref s4);


Throws an exception saying: Object referance not set to an instance of an object.

why do you need to reference it a string? what happens if you use my example?

Originally Posted by xBrady

Ok, this isn't working right.
So this code compiles and runs without exception:
MonkeyTalk.NMEA_TYPES nn = new MonkeyTalk.NMEA_RMC;
string s = myMonkeyTalk.RetrieveLastNMEA(ref nn);

Problem is, the only string this function returns is "Unknown NMEA String".
Any ideas?


EDIT:fixed one problem but I am still getting the same error.

Sorry, I can't get you past here since I've never even looked at MonkeyTalk.