如何使用在Visual Studio中明确加载的C ++类dll [英] How to use a C++ class dll loaded explicitly in visual studio

问题描述

正是出于这里提到的原因：
http：/ /msdn.microsoft.com/en-us/library/vstudio/253b8k2c.aspx

应用程序不知道






我需要加载一个dll不能将其名称绑定到应用程序。也就是说，我不需要应用程序要求myDll.dll工作（因为在我们的配置系统中，myDll.dll不像这样命名）。但是，对于每个函数使用 GetProcAddress 看起来不是一个好主意，特别是因为它需要修饰的名称，这是容易出错的。

我想知道是否有一种方法可以继续使用__declspec（dllimport）或类似的没有dll名称绑定。

我最后的手段是创建一个C接口和使用 GetProcAddress 的类，但我认为应该有更好的方法。

编辑

我应该注意，我可以编辑库的.cpp和.h，创建一个.lib等。

我甚至（但这是非常具体的这个应用程序）创建一个类的对象包含在dll（我们有一些钩子为此）。但是，我不能使用我的dll类的头，因为那样它需要我加载myDll.dll

解决方案

使用dumpbin程序列出导出的符号：

  dumpbin / exports OLDNAME.dll 
  

您将得到这种输出：

  Microsoft（R）COFF / PE Dumper版本10.00.40219.01 
版权所有（C）Microsoft Corporation。版权所有。 
 
 
文件转储OLDNAME.dll 
 
文件类型：DLL 
 
此部分包含以下对OLDNAME.dll的导出
 
 00000000特性
 529B7ABB时间日期戳记Sun Dec 01 19:06:51 2013 
 0.00版本
 1序数基数
 1函数数量
 1名称数量
 
序数提示RVA名称
 
 1 0 00011109？MtDlladd @@ YAHHH @ Z = @ ILT + 260（？MtDlladd @@ YAHHH @ Z）
 
摘要
 
 1000 .data 
 1000 .idata 
 2000 .rdata 
 1000 .reloc 
 1000 .rsrc 
 4000 .text 
 10000 .textbss 
  

现在创建一个包含以下内容的新文本文件： / p>

  LIBRARY NEWNAME 
 EXPORTS 
？MtDlladd @@ YAHHH @ Z 
  

将NEWNAME替换为有问题的DLL的最终名称。
在EXPORTS下，复制由implib给出的所有函数名称。
将文本文件命名为NEWNAME.DEF

使用 lib ：



  lib /def:NEWNAME.DEF /OUT:NEWNAME.lib 
  

现在您可以链接到该库，您的应用程序将需要NEWNAME.DLL

For exactly the reason mentioned here: http://msdn.microsoft.com/en-us/library/vstudio/253b8k2c.aspx

"The application does not know the name of a DLL that it will have to load until run time"

I need to load a dll that doesn't bind its name to the application. That is, I don't need the application to require "myDll.dll" to work (because in our configuration system, myDll.dll is not named like that). However, using GetProcAddress for every function doesn't seems like a good idea, specially since it needs the decorated names, and that's error prone.

I was wondering if there's a way to continue using __declspec(dllimport) or something similar without the dll name binding.

My last resort is to create a C interface and a class that uses GetProcAddress, but I think there should be a better way.

Edit:

I should note that I can edit the .cpp and .h of the library, create a .lib, etc.

I can even (but this is very specific to this application) create an object of the class contained in the dll (we have some hooks for this). However, I can't use the header of my dll class, because then it requires that I load "myDll.dll"

解决方案

Use the dumpbin program to list the exported symbols:

dumpbin /exports OLDNAME.dll

You will get that kind of output:

Microsoft (R) COFF/PE Dumper Version 10.00.40219.01
Copyright (C) Microsoft Corporation.  All rights reserved.


Dump of file OLDNAME.dll

File Type: DLL

  Section contains the following exports for OLDNAME.dll

    00000000 characteristics
    529B7ABB time date stamp Sun Dec 01 19:06:51 2013
        0.00 version
           1 ordinal base
           1 number of functions
           1 number of names

    ordinal hint RVA      name

          1    0 00011109 ?MtDlladd@@YAHHH@Z = @ILT+260(?MtDlladd@@YAHHH@Z)

  Summary

        1000 .data
        1000 .idata
        2000 .rdata
        1000 .reloc
        1000 .rsrc
        4000 .text
       10000 .textbss

Now create a new text file with the following contents:

LIBRARY NEWNAME
EXPORTS
?MtDlladd@@YAHHH@Z

Replace NEWNAME with the final name of your problematic DLL. Under EXPORTS, copy all the function names given by implib, as is. Name that text file NEWNAME.DEF

Make a new lib file with that DEF file, using lib:

lib /def:NEWNAME.DEF /OUT:NEWNAME.lib

Now you can link with that lib, and your application will require NEWNAME.DLL

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