未处理的异常：System.EntryPointNotFoundException：无法在

Question

我试图从 c# 调用 golang dll，并将结果和性能与从 c# 调用 c dll 进行比较，所以我做了以下操作：

我开始构建 c dll 并将其称为第 1 步：编写 C 代码

// cmdll.c

// Compile with: -LD

int __declspec(dllexport) SampleMethod(int i)

{

  return i*10;

}

第 2 步：编译 C 代码：

打开Visual Studio x64 Native Tools Command Prompt

运行命令：cl -LD cmdll.c

第 3 步：编写 C# 代码

// cm.cs

using System;

using System.Runtime.InteropServices;

public class MainClass

{

    [DllImport("Cmdll.dll")]

    public static extern int SampleMethod(int x); // function signature, must have a return type

    static void Main()

    {

        Console.WriteLine("SampleMethod() returns {0}.", SamplMethod(5));

    }

}

第 4 步：编译 c# 文件并将 exe 构建为：

打开Visual Studio x64 Native Tools Command Prompt

运行命令：csc -platform:x64 cm.cs

上面的事情运行顺利

我想使用 golang 做同样的事情，并遵循以下内容：

第一步：编写go代码：

//lib.go

package main

import "C"

//export SamplMethod

func SamplMethod(i int) int {

    return i * 10

}

func main() {

    // Need a main function to make CGO compile package as C shared library

}

第二步：构建dll文件，将上面的代码编译为：

go build -ldflags="-s -w" -o lib.dll -buildmode=c-shared lib.go

我使用 来-ldflags="-s -w"减小生成的文件大小，但不确定-buildmode我应该使用什么，所以随机选择c-shared而不是c-archive 更新：我也尝试过go build -ldflags="-s -w" -o lib.dll -buildmode=c-archive lib.go并得到相同的结果

第 3 步：编写 ac 代码，将.dll和.h生成的文件结合起来go生成等效文件c dll

//goDll.c

#include <stdio.h>

#include "lib.h"

// force gcc to link in go runtime (may be a better solution than this)

GoInt SamplMethod(GoInt i);

void main() {

}

第 4 步：将 goDll.c 文件编译为：

gcc -shared -pthread -o goDll.dll goDll.c lib.dll -lWinMM -lntdll -lWS2_32

第 5 步：构建 c# 代码以调用生成的 dll，代码与上面相同，但更改 dll 文件名：

// cm.cs

using System;

using System.Runtime.InteropServices;

public class MainClass

{

    [DllImport("goDll.dll")]

    public static extern int SampleMethod(int x); // function signature, must have a return type

    static void Main()

    {

        Console.WriteLine("SampleMethod() returns {0}.", SamplMethod(5));

    }

}

Answer 1

它与我一起工作如下：第一步：编写go代码：// main.gopackage mainimport "C"import "fmt"//export HelloWorldfunc HelloWorld() {&nbsp; &nbsp; fmt.Printf("hello world from GO\n")}func main() {}// compile the code as:// go build -ldflags="-s -w" -buildmode=c-shared -o libgo.dll main.go第 2 步：将 C# 代码编写为：// main.csusing System;using System.Runtime.InteropServices;public class MainClass{&nbsp; &nbsp; [DllImport("libgo.dll")]&nbsp; &nbsp; public static extern void HelloWorld(); // function signature, must have a return type&nbsp; &nbsp; static void Main()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; HelloWorld();&nbsp; &nbsp; }}// compile as:// open:// Visual Studio x64 Native Tools Command Prompt// csc -platform:x64 cm.cs第三步：编译这两个文件，从编译go文件开始第四步：运行可执行文件：更新去文件：// main.gopackage mainimport (&nbsp; &nbsp; "fmt")// The import "C" should come directly after the // #include ..., i.e. no empty lines allowed,// if there are empty lines, the compliler will read the // #include as normal comment, not as C import/*#include <stdlib.h>*/import "C"//export GetHellofunc GetHello(Input *C.char) *C.char {&nbsp; &nbsp; cStr := C.CString(fmt.Sprintf("From DLL: Hello, %s!\n", C.GoString(Input)))&nbsp; &nbsp; //&nbsp; C.free(unsafe.Pointer(cStr))&nbsp; &nbsp; return cStr}func main() {}// compile the code as:// go build -ldflags="-s -w" -buildmode=c-shared -o libgo.dll main.goC#文件：// main.csusing System;using System.Text;using System.Runtime.InteropServices;public class MainClass{&nbsp; &nbsp; [DllImport("libgo.dll", CharSet = CharSet.Unicode,&nbsp;&nbsp; &nbsp; CallingConvention = CallingConvention.StdCall)]&nbsp; &nbsp; public static extern IntPtr GetHello(byte[] data);&nbsp; &nbsp; static string CallDll(string name) {&nbsp; &nbsp; &nbsp; &nbsp; IntPtr output= IntPtr.Zero;&nbsp; &nbsp; &nbsp; &nbsp; var a = GetHello(Encoding.UTF8.GetBytes(name));&nbsp; &nbsp; &nbsp; &nbsp; return "GetHello Returns: " + Marshal.PtrToStringAnsi(a);&nbsp; &nbsp; }&nbsp; &nbsp; static void Main()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; Console.WriteLine(CallDll("Ahmad"));&nbsp; &nbsp; }}// compile as:// open:// Visual Studio x64 Native Tools Command Prompt// csc -platform:x64 main.cs这是一个使用字符串的示例：