https://vxlabs.com/tags/dependency-walker/ Recent content in Dependency Walker on vxlabs Hugo en-us Wed, 06 Dec 2017 12:00:00 +0000 https://vxlabs.com/2017/12/06/how-to-debug-pyinstaller-dll-pyd-load-failed-issues-on-windows/ Wed, 06 Dec 2017 12:00:00 +0000 https://vxlabs.com/2017/12/06/how-to-debug-pyinstaller-dll-pyd-load-failed-issues-on-windows/ <h1 id="tldr">TL;DR</h1> <p>When debugging DLL load errors on Windows, use <a href="https://github.com/lucasg/Dependencies">lucasg’s open source and more modern rewrite of the old Dependency Walker software</a>. Very importantly, keep on drilling down through indirect dependencies until you find the missing DLLs.</p> <h1 id="the-problem">The Problem</h1> <p>Recently I had to package up a wxPython and VTK-based app for standalone deployment on Windows. Because of great experience with <a href="http://www.pyinstaller.org/">PyInstaller</a>, I opted to use this tool.</p> <p>With the first try with the freshly built package on the deployment machine, it refused to start up due to an <code>ImportError: DLL load failed: The specified module could not be found.</code>, and specifically with the <code>vtk.vtkCommonCorePython.pyd</code> Python extension DLL.</p>