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Update ThirdParty dll

I'm linking in a dll in c++ though edits in MyProject.Build.cs. I ended up with this though looking at various posts here:

 PublicAdditionalLibraries.Add(Path.Combine(PathToThirdPartyLibrariesFolder, "MyLinkedLibrary.lib"));
 CopyToBinaries(@"ThirdParty\MyLinkedLibrary\Libraries\MyLinkedLibrary.dll", Target);
 RuntimeDependencies.Add(new RuntimeDependency("$(ProjectDir)/Binaries/Win64/MyLinkedLibrary.dll"));
 PublicIncludePaths.Add(Path.Combine(PathToThirdPartyFolder, "MyLinkedLibrary", "Includes"));

and it works great. However, I tried to add a new function to my linked library :

 int MyNamespace::TestFunction() const
     return 4;

which is pretty simple compared to other functions I have successfully exported. Now, however, when I try to run game and/or Editor from VisualStudio I get error

The procedure entry point ?TestFunction@MyObject@MyNamespace@QEBAHXZ could not be located in the dynamic link library C:.....\Binaries\Win64\UE4Editor-MyProject.dll

Note that MyProject compiles in Visual Studio. MyProject compiles and runs fine if I ommit the line

 int x = myObject_->TestFunction();

I also have a separate c++ project that tests MyLinkedLibrary.dll by calling the same function and it works fine. I've also double cheked that ...MyProject.dll and MyLinkedLibrary.dll are compiled for x64. Any ideas?

Product Version: UE 4.15
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asked Jul 13 '17 at 09:25 AM in C++ Programming

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For posterity I will write the solution that I found. At some point the build process had copied an old version of the dlls into "C:\Program Files\Epic Games\UE_4.15\Engine\Binaries\Win64" . I deleted these, recompiled, and it worked.

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answered Jul 13 '17 at 02:48 PM

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