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I wrote and app with Qt for Windows and Linux and I am using some dll's from OpenSSL. I am testing my app on two windows 10 machines and on one it works perfectly fine but on the other I get an error the app can't find libeay32.dll.

The app that works is loading libeay32.dll and ssleay32.dll but I don't know from where it is getting them. I uninstalled OpenSSL 64 and OpenSSL 32. And I renamed libeay32.dll and ssleay32.dll to _libeay32.dll and _ssleay32.dll in Git\mingw64\bin, Qt\Tools\QtCreator\bin, Windows\System32, and Windows\SysWOW64.

The app still works but I have no idea why. Where else could OpenSSL store the dll files if they don't appear with dir /s *libeay32/dll? or how can I find out from where the app is loading the dlls?

jww
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Namox9001
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  • You probably need [How to check for DLL dependency?](http://stackoverflow.com/q/7378959) or [How do I detect the DLLs required by an application?](http://stackoverflow.com/q/362560) Also see [Installing and registering win32 OpenSSL libraries](http://stackoverflow.com/q/906310). – jww Jan 10 '17 at 01:56
  • *"... how can I find out from where the app is loading the dlls..."* - On the working machine, use [Process Explorer](https://technet.microsoft.com/en-us/sysinternals/processexplorer.aspx). From the *View* menu, enable *Show Lower Pane*; then from the *View* menu Lower Pane, select *DLLs*. [Where to install shared DLLs on Windows](http://stackoverflow.com/q/2677808) may also be useful. – jww Jan 10 '17 at 08:13
  • Possible duplicate of [How to check for DLL dependency?](http://stackoverflow.com/questions/7378959/how-to-check-for-dll-dependency) – Elcan Jan 11 '17 at 13:36

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Try to use the Dependency Walker utility. It can to locate the all dll dependencies of your application.

Alexander Trotsenko
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