如何设置一个dll的入口点 [英] How can i set an entrypoint for a dll

问题描述

首先我想到dll DLLMain的入口点，但是当我尝试在C＃中导入它时，我得到一个错误entrypoint没有找到这里是我的代码：

First i thought entry point in dlls DLLMain but then when i try to import it in C# i get an error that entrypoint wasn't found Here is my code:

#include <Windows.h>

int Test(int x,int y)
{
    return x+y;
}

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        MessageBox(0,L"Test",L"From unmanaged dll",0);
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
} 

如何设置我的dll的入口点？如果你不介意你能给我很少解释关于入口点吗？

How can i set an entry point for my dll? And if you dont mind can you give me little explanation about entry point?

像我必须设置导入相同的dll，改变入口点，所以我可以使用其他功能在同一dll？ 。

Like do i have to set import the same dll again and changing the entry point so i can use other functions in same dll? thanks in advance.

推荐答案

在你的例子中，你似乎想要Test（）成为一个入口点，导出。即使您开始导出它，它可能无法正常工作与C ++名称装饰（万岁）。我建议重新定义你的函数为：

In your example, it seems you intend Test() to be an entry point however you aren't exporting it. Even if you begin exporting it, it might not work properly with C++ name "decoration" (mangling). I'd suggest redefining your function as:

extern "C" __declspec(dllexport) int Test(int x,int y)

externC C ++名称调整。 __ declspec（dllexport）组件导出符号。

The extern "C" component will remove C++ name mangling. The __declspec(dllexport) component exports the symbol.

请参阅http://zone.ni.com/devzone/cda/tut/p/id/3056 了解详情。

编辑：您可以按照这种方式添加任意数量的入口点。调用代码只需要知道要检索的符号的名称（如果你正在创建一个静态的.lib，它会为你处理它）。

You can add as many entry points as you like in this manner. Calling code merely must know the name of the symbol to retrieve (and if you're creating a static .lib, that takes care of it for you).

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