使用DLL而不导入LIB [英] using DLL without importing the LIB

问题描述

大家好，



我有一个用VC ++ 2005编写的应用程序，我创建了一个DLL（导出一个函数）



我的DLL中的代码如下：

Hi all,

I have an application written in VC++ 2005 and i create a DLL (exporting a single function)

The Code in my DLL is as below :

#include <stdio.h>
#include <atlstr.h>


extern "C"
{
	__declspec(dllexport) void DisplayHelloFromDLL()
	{
		CString str;
		printf ("Hello from DLL !\n");
	}
}

问题是我想通过导入生成的LIB从我的DLL导入函数我不知道如何在VC2005中这样做。



Plz有人帮助我或给我一个线索。 Thx

The prob is i wanna import the Function from my DLL withour Importing the generated LIB and i dont know how to do that in VC2005.

Plz somebody help me or guive me a clue. Thx

推荐答案

这是通过加载库，获取所需函数的地址并调用它们来完成的（另请参阅 GetProcAddress [ MSDN中的^ ]：

This is done by loading the library, getting the adresses of the required functions, and call them (see also GetProcAddress [^] in the MSDN):

typedef VOID (CALLBACK* LPFN_DHFDLL)();
HINSTANCE hInst = ::LoadLibrary(_T("MyLib.dll"));
if (NULL != hInst)
{
    LPFN_DHFDLL pDisplayHello = 
        (LPFN_DHFDLL)::GetProcAddress(hInst, "DisplayHelloFromDLL");
    if (pDisplayHello)
        pDisplayHello();
    ::FreeLibrary(hInst);
}

查看此内容。



当你说你没有使用import lib时，我假设你没有生成它。因此不需要使用__declspec（dllexport）来导出函数，而是可以使用def文件：



DefFile.def

================

图书馆MyDLL

出口

DisplayHelloFromDLL
================



现在来访问这个。我们所要做的就是将MyDLL映射到我们的exe地址空间。为此我们可以使用'LoadLibrary'。检查一下：

Hi,
Check this.

When you say that you are not using import lib, I assume that you are not generating it. So there is not need to use __declspec(dllexport) to export a function, rather you can use a def file:

DefFile.def
================
LIBRARY "MyDLL"
EXPORTS
DisplayHelloFromDLL
================

Now coming to accessing this. All we have to do is to map that "MyDLL" into our exe address space. For this we can use using 'LoadLibrary'. Check this:

#include <windows.h>

// Declaring Function pointer for DisplayHelloFromDLL
typedef void ( WINAPIV* LPFN_DISPLAYHELLO ) ( ); 

void main()
{
    // Loading DLL
    HINSTANCE hMyDLL = LoadLibraryA("Dll_New.dll");

    // Getting address of the DLL exported function
    LPFN_DISPLAYHELLO fnDisplayName = (LPFN_DISPLAYHELLO)GetProcAddress(
		                                   hMyDLL,
					      "DisplayHelloFromDLL" );
                                                          

    // Actual function call
    fnDisplayName();

   // Releasing DLL 
   FreeLibrary( hMyDLL );
}

谢谢你们俩。这正是我想要的。我找到了很多教程，但大多数都使用生成的Lib，我发现每次更改DLL时都不适合使用我必须使用该DLL重新编译项目。



再次感谢你。你为我节省了很多时间。

Thank you both. that was exactly what i was looking for. I found many tutorials but most of them use the generated Lib and i found not not suitable coz everytime i change the DLL i have to recompile the projects using that DLL.

thank you again. You saved me a lot of time.

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