Detailed explanation of Golang compiled into DLL file

The following columngolang tutorialwill 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  #include  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; }

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