C#•11mo ago

Best practices when using C++ DLL Project interop with C#?

I've implemented some of my project in C++ and I call that code from C#. My current way of loading the DLL is to call the LoadLibrary (and then use GetProcAddress + the Delegate helper method to invoke methods safely from C#). But I have to hard code the DLL's path, allowing it to either exist in the bin folder, or backing out of that folder to the solution folder and into x64, etc., to the built DLL file. How else can I load the DLL?

5 Replies

TheBoxyBear•11mo ago

Is the c++ project in the same solution as the c# project you're loading it from? In that case, MSBuild is very robust and there are many ways to configure your projects to automatically copy the dll from the c++ output to the c# output on build

bighugemassive3OP•11mo ago

It is yeah

HtmlCompiler•11mo ago

you don't need to hardcode the path, you can load the dll from current/working directory

bighugemassive3OP•11mo ago

That's becomes the bin folder of the app This is what I do now:

string binFilePath = Path.Combine(Path.GetFullPath("."), DLL_NAME);
if (!File.Exists(binFilePath)) {
    #if DEBUG
    binFilePath = "..\\..\\..\\..\\x64\\Debug\\" + DLL_NAME;
    #else
    binFilePath = "..\\..\\..\\..\\x64\\Release\\" + DLL_NAME;
    #endif
}

string binFilePath = Path.Combine(Path.GetFullPath("."), DLL_NAME);
if (!File.Exists(binFilePath)) {
    #if DEBUG
    binFilePath = "..\\..\\..\\..\\x64\\Debug\\" + DLL_NAME;
    #else
    binFilePath = "..\\..\\..\\..\\x64\\Release\\" + DLL_NAME;
    #endif
}

HtmlCompiler•11mo ago

you could get the executing path for example from System.Reflection.Assembly.GetExecutingAssembly().Location or if you don't have any specific necessity you could just try omitting the path

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Best practices when using C++ DLL Project interop with C#?