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2012-03-12T16:50:16.773
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Okay, with your help and a fair bit of Google, this finally works! Here's a run-down, in case it helps anyone else in the future: <ul> <li>Use the <a href="http://www.flounder.com/ultimateheaderfile.htm" rel="nofollow">Ultimate Header File</a> for a blueprint of how to create the header file. </li> <li>It is important to understand how compiling as C will not name mangle, whereas compiling as C++ will. </li> <li>It also appears that DevC++ has a neat <code>BUILDING_DLL</code> flag but Visual Studio requires you to create a definition in your main.c file.</li> <li><code>__stdcall</code> does something called 'name decoration' that is different from name mangling but will still change your function name. Thanks to @slugonamission for giving me a pointer about this. It finally clicked when using dumpbin.exe, as suggested by @HansPassant.</li> <li>so, switching to <code>__cdecl</code> manages to avoid name decoration, and compiling in C (or using <code>extern</code> and compiling in C++) avoids name mangling.</li> <li>and the dll will finally give me CalcGraph as a valid entry point!</li> </ul> The Implicit / Explicit dll linking is a very important distinction. Implicit linking requires a .lib file, the .dll and perhaps also a .h file. Explicit linking is what I was after - you can get away with the .dll by itsself. Thanks to @squelos for the link explaining this. And last but not least: In the dll: <pre><code>extern _COMPILING_ void __cdecl CalcGraph(PanelParameters *, Calculations *); </code></pre> And in the VB code: <pre><code>Imports System.Runtime.InteropServices Private Declare Sub CalcGraph Lib "myDLL.dll" (ByRef params As Parameters, _ ByRef calcs As Calculations) </code></pre> And it finally worked!
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