[英]Create dynamic library using MSVC command line
I've read a lot of posts and yet I don't understand how to create a simple dynamic library on windows using MSVC in command line.我已经阅读了很多帖子,但我不明白如何在命令行中使用 MSVC 在 Windows 上创建一个简单的动态库。 What I'm doing is:
我正在做的是:
1º) Code the DLL 1º) 对 DLL 进行编码
dynamic.h动态文件
#pragma once
__declspec(dllexport) void HelloWorld();
dynamic.c动态文件
#include "dynamic.h"
#include <stdio.h>
void HelloWorld(){
printf("Hello World");
}
2º) Compile it 2º) 编译它
cl /LD dynamic.c
(it compiles correctly and without errors generating dynamic.dll and dynamic.lib) (它正确编译并且没有错误生成 dynamic.dll 和 dynamic.lib)
3º) Try to test it 3º) 尝试测试一下
main.c主文件
#include<stdio.h>
#include"dynamic.h"
int main(){
HelloWorld();
return 0;
}
cl main.c dynamic.lib
ERROR (by cl.exe x64)错误(通过 cl.exe x64)
main.cpp
Microsoft (R) Incremental Linker Version 14.16.27034.0
Copyright (C) Microsoft Corporation. All rights reserved.
/out:main.exe
main.obj
.\dynamic.lib
main.obj : error LNK2019: unresolved external symbol "void __cdecl HelloWorld(void)" (?HelloWorld@@YAXXZ) referred in main
main.exe : fatal error LNK1120: unresolved externals
Please teach me how dynamic libraries compilation really work because I can't understand请教我动态库编译是如何工作的,因为我无法理解
Try this way in dynamic.h :在 dynamic.h 中尝试这种方式:
#ifdef __cplusplus
extern "C" {
#endif
__declspec(dllexport) void HelloWorld();
#ifdef __cplusplus
}
#endif
Use 'dumpbin.exe /exports dynamic.dll' to show exported symbols使用 'dumpbin.exe /exports dynamic.dll' 显示导出的符号
In main.c
it needs to see the function declaration like this:在
main.c
它需要看到这样的函数声明:
__declspec(dllimport) void HelloWorld();
So you cannot use the same dynamic.h
as you currently have, for both building the DLL and building main.c
.因此,您不能使用与当前相同的
dynamic.h
来构建 DLL 和构建main.c
。
Normally people will use a preprocessor setup so the same header file has a different declspec depending who is including it, for example:通常人们会使用预处理器设置,因此相同的头文件具有不同的 declspec,具体取决于包含它的人,例如:
// dynamic.h
#ifndef DLL_FUNCTION
#define DLL_FUNCTION __declspec(dllimport)
#endif
DLL_FUNCTION void HelloWorld();
dynamic.c (in the DLL): dynamic.c(在 DLL 中):
#define DLL_FUNCTION __declspec(dllexport)
#include "dynamic.h"
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