| gclib 528 Communications API for Galil controllers and PLCs |

message_example.cpp
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1
10 #include "examples.h"
11
12 #include <iostream> //std::cout
13 using namespace std;
14
16
20 int main(int argc, char * argv[])
21 {
22 GReturn rc = GALIL_EXAMPLE_OK;
23 char buf[G_SMALL_BUFFER];
24
25 //var used to refer to a unique connection. A valid connection is nonzero.
26 GCon g = 0;
27
28 try
29 {
30 if (argc != 2) //Invalid number of arguments
31 {
32 cerr << "Incorrect number of arguments provided\n";
33 cerr << "Usage: message_example.exe <ADDRESS>\n";
34 return GALIL_EXAMPLE_ERROR;
35 }
36
37 char* address = argv[1]; //Retrieve address from command line
38 sprintf(buf, "%s --subscribe MG", address);
39 e(GOpen(buf, &g)); //Opens a connection at the provided address
40
41 //Demonstrates how to receive messages from the controller
42 //and detect differences in Trace and crashed code.
43 rc = message(g);
44 }
45 catch (GReturn gr)
46 {
47 GError(gr, buf, G_SMALL_BUFFER); //Get Error Information
48 cout << buf << '\n';
49 if (g)
50 {
51 GSize size = sizeof(buf);
52 GUtility(g, G_UTIL_ERROR_CONTEXT, buf, &size);
53 cout << buf << '\n'; //further context
54 }
55 return GALIL_EXAMPLE_ERROR;
56 }
57
58 return rc;
59 }
examples.h
GCon
void * GCon
Connection handle. Unique for each connection in process. Assigned a non-zero value in GOpen().
Definition: gclib.h:92
GUtility
GCLIB_DLL_EXPORTED GReturn GCALL GUtility(GCon g, GOption request, GMemory memory1, GMemory memory2)
Provides read/write access to driver settings and convenience features based on the request variable.
main
int main(int argc, char *argv[])
Main function for Commands Example.
Definition: commands_example.cpp:20
G_UTIL_ERROR_CONTEXT
#define G_UTIL_ERROR_CONTEXT
GUtility(), provides additional error context, where available.
Definition: gclib.h:70
GOpen
GCLIB_DLL_EXPORTED GReturn GCALL GOpen(GCStringIn address, GCon *g)
Open a connection to a Galil Controller.
GError
GCLIB_DLL_EXPORTED void GCALL GError(GReturn rc, GCStringOut error, GSize error_len)
Provides a human-readable description string for return codes.
Definition: gclibo.c:445
message
GReturn message(GCon g)
Demonstrates how to receive messages from the controller and detect differences in Trace and crashed ...
Definition: message.cpp:14
GSize
unsigned int GSize
Size of buffers, etc.
Definition: gclib.h:93
G_SMALL_BUFFER
#define G_SMALL_BUFFER
Most reads from Galil are small. This value will easily hold most, e.g. TH, TZ, etc.
Definition: gclib.h:87
e
void e(GReturn rc)
A trivial, C++ style return code check used in Galil's examples and demos.
Definition: examples.h:30
GReturn
int GReturn
Every function returns a value of type GReturn. See gclib_errors.h for possible values.
Definition: gclib.h:91