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    <pre><code>#pragma once #pragma comment (lib, "CryptoLib.lib") #include "stdafx.h" </code></pre> <p>This is wrong. The compiler will go looking for the stdafx.h #include directive and <strong>ignores</strong> anything it finds before that. So it will completely ignore your #pragma comment directive. The linker will therefore <em>not</em> link CryptoLib.lib and you'll indeed get this linker error. Using #pragma once in a .cpp file does not make sense. </p> <p>Another problem is that you appear to compile this code with /clr in effect, we can tell from the <em>using</em> statement. The compiler cannot tell that your function is a __cdecl function, it will assume the default and that's __clrcall when managed code compilation is enabled. You have to be explicit about it, like this: </p> <pre><code>#include "stdafx.h" // First line in file! #pragma managed(push, off) #include "CryptoLib.h" #pragma comment (lib, "CryptoLib.lib") #pragma managed(pop) </code></pre> <p>There's yet another possible problem with the function declaration, it isn't clear whether that function was compiled with a C compiler or a C++ compiler. A C++ compiler will <em>decorate</em> the function name. If it was actually compiled with a C compiler then you have to tell the compiler about that:</p> <pre><code>#ifndef _CRYPTOLIB_H_ #define _CRYPTOLIB_H_ #ifdef __cplusplus extern "C" { #endif void __cdecl CryptoLib_Encrypt(unsigned char *Data, unsigned char *RandomNr); #ifdef __cplusplus } #endif #endif /* _CRYPTOLIB_H_ */ </code></pre> <p>Note the usage of <code>extern "C"</code>, it disables name decoration. If you cannot or should not edit this header file then you can cram the extern "C" {} in your .cpp file, surrounding the #include.</p> <p>If you still have trouble then post the <strong>exact</strong> linker error message as well what you see when you run <code>Dumpbin.exe /exports</code> on the DLL from the Visual Studio Command Prompt.</p>
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    1. POC++\CLI LNK Error 2019 & 2028 with Included .h and .lib (Linker finds those Files) [Wrapper]
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    1. COI changed the first lines of Wrapper.cpp and i still get the same Errors. And i think the lib is written in c++ code, because i didn't create the header myself. Thanks for trying
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    2. COThe names got the C++ decoration, note the @@$$FYAXPAE0@Z in the name. I specifically warned about that. You really do need to run dumpbin.exe so you know what these symbols *really* look like. Please avoid taking shortcuts.
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    3. COI have no DLL, i sould create one depending on the lib Is that possible?
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