Detailed explanation of Golang compiled into DLL file
The following column golang tutorial will introduce to you the method of compiling Golang into a DLL file. I hope it will be helpful to friends in need!
Golang requires gcc when compiling dll, so install MinGW first.
Windows 64-bit system should download the 64-bit version of MinGW: https://sourceforge.net/projects/mingw-w64/
After downloading, run mingw-w64-install.exe and complete MingGW installation.
First write the golang program exportgo.go:
package main
import "C"
import "fmt"
//export PrintBye
func PrintBye() {
fmt.Println("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 it into a DLL file:
go build -buildmode=c-shared -o exportgo.dll exportgo.go
After compilation, you get two files, exportgo.dll and exportgo.h.
Refer to the function definition in the exportgo.h file and write the C# file importgo.cs:
using System;
using System.Runtime.InteropServices;
namespace HelloWorld
{
class Hello
{
[DllImport("exportgo.dll", EntryPoint="PrintBye")]
static extern void PrintBye();
[DllImport("exportgo.dll", EntryPoint="Sum")]
static extern int Sum(int a, int b);
static void Main()
{
Console.WriteLine("Hello World!");
PrintBye();
Console.WriteLine(Sum(33, 22));
}Compile the CS file to get the exe
csc importgo.cs
Put the exe and dll In the same directory, run.
>importgo.exe Hello World! From DLL: Bye! 55
The string parameters in golang can be referenced as follows in C#:
public struct GoString
{
public string Value { get; set; }
public int Length { get; set; }
public static implicit operator GoString(string s)
{
return new GoString() { Value = s, Length = s.Length };
}
public static implicit operator string(GoString s) => s.Value;
}// func.go
package main
import "C"
import "fmt"
//export Add
func Add(a C.int, b C.int) C.int {
return a + b
}
//export Print
func Print(s *C.char) {
/*
函数参数可以用 string, 但是用*C.char更通用一些。
由于string的数据结构，是可以被其它go程序调用的，
但其它语言（如 python）就不行了
*/
print("Hello ", C.GoString(s)) //这里不能用fmt包，会报错，调了很久...
}
func main() {
} Compile
go build -ldflags " -s -w" -buildmode=c-shared -o func.dll func.go
is still a bit big, 880KB. The pure C version is only 48KB. It should not contain all the dependencies. , go is all-inclusive
Go call
package main
import (
"fmt"
"syscall"
)
func main() {
dll := syscall.NewLazyDLL("func.dll")
add := dll.NewProc("Add")
prt := dll.NewProc("Print")
r, err, msg := add.Call(32, 44)
fmt.Println(r)
fmt.Println(err)
fmt.Println(msg)
name := C.CString("Andy")
prt.Call(uintptr(unsafe.Pointer(name)))
}out: 76 0 The operation completed successfully. Hello Andy
Python call
from ctypes import CDLL, c_char_p
dll = CDLL("func.dll")
dll.Add(32, 33)
dll.Print(c_char_p(bytes("Andy", "utf8")))C call
#include <iostream>
#include <windows.h>
using namespace std;
typedef int(*pAdd)(int a, int b);
typedef void(*pPrt)(char* s);
int main(int argc, char *argv[])
{
HMODULE dll= LoadLibraryA("func.dll");
pAdd add = (pAdd)GetProcAddress(dll, "Add");
pPrt prt = (pPrt)GetProcAddress(dll, "Print");
cout << add(321, 33) << endl;
prt("Andy");
FreeLibrary(dll);
return 0;
}For more related technical articles, please Visit the go language tutorial column!
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