StackOverflow2013

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2013-10-30T20:34:45.787
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2013-10-30T20:34:45.787
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I encountered the same error ("LNK2019: unresolved external symbol ...."). My headers and calls were defined correctly, and it only failed to link in Debug mode (no complaints in Debug mode). It turned out that my issue was caused by an incorrect <code>.vcxproj</code> file. When I added new dependencies to my project by editing the <code>vxcproj</code> file, I made a mistake: I thought that the two sections were identical except for the file extension, so I copy-pasted two lines from the first <code><ItemGroup></code> to the last <code><ItemGroup></code> (see below). It went unnoticed for a while, because I used a batch script to compile the code in Release mode. When I switched to Debug mode, the project failed at the linking stage. Ultimately, I discovered my error, and resolved the problem with the following patch: <pre class="lang-diff prettyprint-override"><code>- <ClCompile Include="crypto/crypto.h" /> - <ClCompile Include="crypto/rsa_public_key.h" /> + <ClInclude Include="crypto/crypto.h" /> + <ClInclude Include="crypto/rsa_public_key.h" /> </code></pre> Buggy version of the <code>.vcxproj</code> file: <pre><code> <ItemGroup> ... <ClCompile Include="main.cpp" /> <ClCompile Include="crypto/crypto.cpp" /> <ClCompile Include="crypto/rsa_public_key.cpp" /> </ItemGroup> <ItemGroup> <None Include="main.def" /> </ItemGroup> <ItemGroup> ... <ClInclude Include="main.h" /> <ClCompile Include="crypto/crypto.h" /> <ClCompile Include="crypto/rsa_public_key.h" /> </ItemGroup> <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" /> <ImportGroup Label="ExtensionTargets"> </ImportGroup> </Project> </code></pre> Bottom line: When you get LNK2019 and none of the explanations on the internet help, check your project settings. If you use version control, compare the current project file with a known-good older version.
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1. POHow to solve error LNK2019
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1. USRob W
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