First write the golang program:
package main
import "C"
import "fmt"
//export PrintBye
func PrintBye() {
("From DLL: Bye!")
}
//export Sum
func Sum(a int, b int) int {
return a + b;
}
func main() {
// Need a main function to make CGO compile package as C shared library
}
Compile into DLL file:
go build -buildmode=c-shared -o
After compilation, we get two files and .
Supplement: Go1.10 is compiling into a small dll instance
Look at the code ~
package main
import (
"net"
)
// Must importimport "C"
//Compiling into a dynamic library is also a mustfunc main() {}
//export Interfaces
func Interfaces(list []string, retlen *int) string {
interf, err := ()
if err != nil {
return ()
}
for i, v := range interf {
if i >= len(list) {
break
}
list[i] = ()
}
*retlen = len(list)
return ""
}
Compile command:
go build -ldflags "-s -w" -buildmode=c-shared -o
Two files will be generated in the current folder
Here is the use:
#include <>
#include<>
#include <>
#include ""
int main()
{
GoString ret;
GoSlice slice;
=10;
=0;
=calloc(10,sizeof(GoString));
GoInt retlen=0;
ret=Interfaces(slice,&retlen);
if ( != 0)
{
char* retc = calloc(+1,sizeof(char));
memcpy(retc,,);
printf("Return value:%s\n", retc);
free(retc);
retc=NULL;
}
GoString* st=(GoString*)();
for (int i=0;i<retlen;i++)
{
printf("%s\n", st[i].p);
}
free();
=NULL;
return 0;
}
Try not to use the return value to handle it in C, because Go code cannot store pointers to Go allocated memory in C allocated memory. This is very important, otherwise you will crash variously during use.
The above is personal experience. I hope you can give you a reference and I hope you can support me more. If there are any mistakes or no complete considerations, I would like to give you advice.