On Wed, Apr 24, 2019 at 1:51 PM Nitish Saboo <nitish.sabo...@gmail.com> wrote: > > Hi, > > I followed the link ' https://github.com/golang/go/wiki/cgo#function-variables' and made the following changes: > 1)main.go > package main > //#cgo CFLAGS: -I./syslog-ng-3.6.2/ > //#cgo LDFLAGS: syslog-node.so > //#cgo LDFLAGS: -L/usr/local/lib/ -lsyslog-ng > //#cgo LDFLAGS: -L/usr/local/lib/syslog-ng -ldbparser > //#cgo CFLAGS: -I. > //void callOnMeGo_cgo(char *key, char *value, size_t value_len); <<<<<
size_t is going to be undefined here.. Also the chars after ';' should not be there >>Why size_t, char is going to be undefined here ? I followed the exact steps mentioned in 'https://github.com/golang/go/wiki/cgo#function-variables' under the topic 'Function pointer callback'. I have to pass the callback function to the C code. > // #include "syslog-node1.h" > //#include <stdlib.h> > import "C" > > //export CallBack > func CallBack(key *C.char, value *C.char, value_len C.size_t){ > > if remap, ok := field_mappings[C.GoString(key)]; ok { > fmt.Println(key, remap)//Need to check how field mappings work > } > > } > > func ReloadPatternDB(opts Y){ Where from type Y comes? >> Y is simply a struct type Y struct{ x string z map[string]string } > > x := C.CString(opts.x) > C.reload_pattern_db(x, (C.key_value_cb)(unsafe.Pointe r(C.callOnMeGo_cgo))); > > } > > 2)Created a file 'cfuncs.go' > ==================== > package main Package main must have func main(). Where it is? >>I had missed it.Added the func main() but that did not resolve the issue. *Following is the error that I am receiving:* # command-line-arguments */tmp/go-build729657300/b001/_cgo_main.o:/tmp/go-build/cgo-generated-wrappers:2: undefined reference to `callOnMeGo_cgo'* collect2: error: ld returned 1 exit status makefile:6: recipe for target 'main' failed make: *** [main] Error 2 I feel the issue is with the makefile.Looks like the makefile is not able to locate the method ' *callOnMeGo_cgo'.*Let me know if my understanding is correct ? Can someone help me in resolving the issue ? Thanks On Wed, Apr 24, 2019 at 5:39 PM Jan Mercl <0xj...@gmail.com> wrote: > On Wed, Apr 24, 2019 at 1:51 PM Nitish Saboo <nitish.sabo...@gmail.com> > wrote: > > > > Hi, > > > > I followed the link ' > https://github.com/golang/go/wiki/cgo#function-variables' and made the > following changes: > > 1)main.go > > package main > > //#cgo CFLAGS: -I./syslog-ng-3.6.2/ > > //#cgo LDFLAGS: syslog-node.so > > //#cgo LDFLAGS: -L/usr/local/lib/ -lsyslog-ng > > //#cgo LDFLAGS: -L/usr/local/lib/syslog-ng -ldbparser > > //#cgo CFLAGS: -I. > > //void callOnMeGo_cgo(char *key, char *value, size_t value_len); <<<<< > > size_t is going to be undefined here.. Also the chars after ';' should > not be there > > > // #include "syslog-node1.h" > > //#include <stdlib.h> > > import "C" > > > > //export CallBack > > func CallBack(key *C.char, value *C.char, value_len C.size_t){ > > > > if remap, ok := field_mappings[C.GoString(key)]; ok { > > fmt.Println(key, remap)//Need to check how field mappings work > > } > > > > } > > > > func ReloadPatternDB(opts Y){ > > Where from type Y comes? > > > > > x := C.CString(opts.x) > > C.reload_pattern_db(x, > (C.key_value_cb)(unsafe.Pointer(C.callOnMeGo_cgo))); > > > > } > > > > 2)Created a file 'cfuncs.go' > > ==================== > > package main > > Package main must have func main(). Where it is? > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
