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POBuild VC++ project on x64, unable to execute on x86
 

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  1. POBuild VC++ project on x64, unable to execute on x86
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    <p>I have an unmanaged VC++ project that I can build for both x86 and x64 targets. It is being consumed by a .NET program that is compiled for Any CPU. This is on VS2010, but I had the same issue when the solution was built with VS2008 and vcbuild.</p> <p>Here is the build command in my build script:</p> <pre><code>msbuild .\Project.vcxproj /t:Build /p:PlatformToolset=v100 /p:Configuration=Release /p:Platform=%platform% </code></pre> <p>If build on an x86 machine, with %platform%=Win32, everything builds and executes fine</p> <p>If build on an x64 machine, with %platform%=x64, everything builds and executes fine.</p> <p>However, if I build on an x64 machine, with %platform%=Win32, it builds successfully with no errors. But when I copy those supposedly-x86 binaries to an x86 machine, they cause the following error:</p> <pre><code>System.Runtime.InteropServices.SEHException was caught Message=External component has thrown an exception. </code></pre> <p>Tracing that error back to the C++ dll, it failed on this line:</p> <pre><code>if ( FAILED( g_Connection.CreateInstance( _T("ADODB.Connection") ) ) ) ThrowException(_T("Cannot create connection.")); </code></pre> <p>I've gone through my .vcxproj file looking for issues but everything appears correct. There are no imported property files or custom build tasks or anything like that. </p> <p>This is causing issues because we are trying to use a single x64 build server to create builds for both platforms. Our current workaround involves pre-building the C++ dll on two different machines. </p>
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    1. USDave Bauman
    1. USDave Bauman
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    1. COCould you post the runtime error you're getting when attempting to run on an x86 machine?
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      1. POBuild VC++ project on x64, unable to execute on x86
      1. USJacob
    2. CO"they cannot be loaded", apparently.
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      1. POBuild VC++ project on x64, unable to execute on x86
      1. USHans Passant
    3. COAfter a closer look, it's throwing a SEHException so it looks like the C++ dll is being loaded correctly but threw an exception creating an object. I think this is a dependency issue rather than an issue with the C++ dll itself.
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      1. POBuild VC++ project on x64, unable to execute on x86
      1. USDave Bauman
 

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