如何在系统路径外使用dll [英] How to use a dll outside of the system path
问题描述
我制作了一个使用openssl dll（ libeay32.dll 和 ssleay32.dll ）的应用程序。
它是indy使用它们，我不直接调用dll。
I made an application that uses the openssl dlls (libeay32.dll and ssleay32.dll).
It is indy using them, I don't call the dlls directly.
我发现避免安装程序的最简单的解决方法（我只是delpoy一个exe和我可以这样做）是：
The simplest workaround i found to avoid an installer (i just delpoy an exe and i am ok with this approach) is to:
- 将dll作为exe的资源
- 在程序开始时，我将其提取到exe文件夹中
- exe使用它们
是完美的，但我想通过在临时文件夹中提取dll而不是exe文件夹（在许多情况下是桌面）来改进方法。
This is perfect but I would like to improve the approach by extracting the dlls in a temp folder and not on the exe folder (that in many cases is the desktop).
问题是我不知道如何强制应用程序在temp文件夹中使用dll，因为现在的行为是：
如果dll不在当前目录下，尝试在系统路径中定义的目录中进行搜索谁知道一个解决方案，迫使indy在我的临时路径中使用dll？
The problem is that I don't know how to force the application to use the dlls in the temp folder, because now the behaviour is: if dlls are not in current directory try to search in the directories defined in the system path.
（如暂时注册dll）
Who knows a solution to force indy to use the dlls in my temp path? (like "temporarly registering the dlls")
推荐答案
使用 LoadLibrary ，一旦你有将它们写入临时文件夹。
这将使Indy的 LoadLibrary 在需要时使用您的DLL：
Load the DLLs yourself with LoadLibrary as soon as you have written them to the temp folder.
This will make Indy's LoadLibrary use your DLLs when they need them:
如果lpFileName不包含路径，并且有多个
加载的模块具有相同的基本名称和扩展名，函数
将返回一个句柄最初加载的模块。
If lpFileName does not include a path and there is more than one loaded module with the same base name and extension, the function returns a handle to the module that was loaded first.
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