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    <p>C++ dlls can, of course, use or expose C++-specific items (C++ classes, template functions, etc.), and a Delphi DLL could expose Delphi-specific items (sets, strings, etc.). But if both are written properly, and only use things other languages can use too, there should be no difference. </p> <p>Fact is that not all C++ or Delphi DLLs are written properly. Also the default calling convention in Delphi is <code>register</code> (<code>__fastcall</code> in C++Builder), while C and C++ by default use <code>cdecl</code>. But generally both languages should use <code>stdcall</code>.</p> <p>The only way to use a DLL is to either get a header file (.h) for it, or a Delphi import unit. The .h file can be translated into an import unit. If you only have a DLL but none of these, it doesn't make much sense to try to guess the parameters of functions.</p> <p>If you look at the DLL with TDUMP.exe or Dependency Walker, you might get a hint, as was said in another answer. Dependency on e.g. msvcrtXX.dll might be a good hint it is a C++ DLL.</p> <p>You might also try to get a .tlb from the DLL. You can do this in the IDE (From memory: "Component menu" - "import component" or some such).</p> <p>If you want to know the calling convention, read <a href="http://rvelthuis.de/articles/articles-convert.html#cconvs" rel="nofollow">this</a>, especially the part about finding out the calling convention.</p> <p><strong>Addition</strong></p> <p>Some C++ programmers forget to wrap their declarations in <code>extern "C"</code> blocks, so the exported functions are mangled. This could tell you which parameters are required, but you get ugly names. For this, Dependency Walker is a great help, as it can translate them (for VC++ generated or compatible DLLs at least). It makes using those functions from a different C++ compiler or a C compiler pretty hard, though.</p>
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