C++/CLI try catch handling

Question

Below is the code I am using to communicate with my arduino on windows xp. The problem I am having is when I have two commands trying to access the port at the same time, which is the UnauthroizedAccessException catch statement, it outputs the errormessage, and doesn't execute one of the commands, How could I go about coding that catch statement so that instead of catching the error or even making it to the error for the program to finish the first command and then execute with other one, something like a queue....

#include "stdafx.h" #include <iostream> using namespace System; using namespace System::IO::Ports; int main(int argc, char* argv[]) { using namespace std; String^ portName; int baudRate=9600; portName="COM4"; // arduino settings SerialPort^ arduino; arduino = gcnew SerialPort(portName, baudRate); // open port try { arduino->Open(); { if(strcmp(argv[1],"-send")==0){ String^ command = gcnew String(reinterpret_cast<const char*>(argv[2])); if(String::Compare(command,"int6")==0){ arduino->Write("^"); }else arduino->Write(command); } if(strcmp(argv[1],"-get")==0){ String^ command = gcnew String(reinterpret_cast<const char*>(argv[2])); arduino->ReadTimeout = 1000; arduino->WriteLine(command); String^ result = arduino->ReadLine(); Console::Write(result); } } // close port to arduino arduino->Close(); } catch (IO::IOException^ e){ Console::Write("errormessagedisconnected"); } catch (TimeoutException^ e){ Console::Write("errormessage"); } catch (UnauthorizedAccessException^ e){ Console::Write("errormessage"); } catch (ArgumentException^ e){ Console::WriteLine(e->GetType()->Name+": incorrect port name syntax, must start with COM/com"); } // end program return 0; }

Can you clarify smth? Are we talking about this arduino? Do you know what functions throws the exception? Do you have access to these function's source code? — beduin
– beduin, Commented Apr 23, 2011 at 6:22

Antti · Accepted Answer · 2011-04-23 06:21:14Z

The best solution would be to not use exceptions here, if possible. I'd also advise you not to simultaneously run two programs that access the same serial port to avoid the exception in the first place. However, with exceptions you could do it like this:

void f() { bool bFinished = FALSE; while(!bFinished) { try { ThisFunctionThrows(); bFinished = TRUE; } catch(UnauthorizedAccessException^ e) { Console::Write("retrying in 1 sec"); sleep(1); } } }

You can also add a counter if you don't want to wait indefinitely.

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