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    <p>"bradtgmurray" is right, but for Visual C++ compilers, you need to explicitly export your function anyway. But using a .DEF file as proposed by "Serge - appTranslator" is the wrong way to do it.</p> <h2>What is the universal way to export symbols on Visual C++ ?</h2> <p>Using the declspec(dllexport/dllimport) instruction, which works for both C and C++ code, decorated or not (whereas, the .DEF is limited to C unless you want to decorate your code by hand).</p> <p>So, the right way to export undecorated functions in Visual C++ is combining the export "C" idiom, as answered by "bradtgmurray", and the dllimport/dllexport keyword.</p> <h2>An example ?</h2> <p>As an example, I created on Visual C++ an empty DLL project, and wrote two functions, one dubbed CPP because it was decorated, and the other C because it wasn't. The code is:</p> <pre><code>// Exported header #ifdef MY_DLL_EXPORTS #define MY_DLL_API __declspec(dllexport) #else #define MY_DLL_API __declspec(dllimport) #endif // Decorated function export : ?myCppFunction@@YAHF@Z MY_DLL_API int myCppFunction(short v) ; // Undecorated function export : myCFunction extern "C" { MY_DLL_API int myCFunction(short v) ; } ; </code></pre> <p>I guess you already know, but for completeness' sake, the MY_DLL_API macro is to be defined in the DLL makefile (i.e. the VCPROJ), but not by DLL users.</p> <p>The C++ code is easy to write, but for completeness' sake, I'll write it below:</p> <pre><code>// Decorated function code MY_DLL_API int myCppFunction(short v) { return 42 * v ; } extern "C" { // Undecorated function code MY_DLL_API int myCFunction(short v) { return 42 * v ; } } ; </code></pre>
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    1. POIs there a way to suppress c++ name mangling?
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    1. COThanks for an awesome answer... exactly what I needed.
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    2. COI am creating a class within an explicit Dll. Calling constructor for this class generates error "Unresolved external symbol...". I guess this is due to name mangling. Please write how to avoid this problem. DEF file or extern "C" is not helping here.
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    3. CO@ajay : I cannot help you in a comment. What you could do was to use Visual Studio to generate a DLL with example symbols to see how it is done. If you're still stuck, you should post (a limited version of) your code on StackOverflow (or CodeReview?), including both the DLL code (the header, the source), the EXE code linking to it (the source), and the error message. It is possible your error comes from the wrong constructor overload call: Is there an error if you try to call the same constructor from inside the DLL? If yes, then you need to declare/define the right constructor.
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