Fatal Error C1083: Cannot Open Include File: 'Xyz.H': No Such File or Directory

fatal error C1083: Cannot open include file: 'xyz.h': No such file or directory?

Either move the xyz.h file somewhere else so the preprocessor can find it, or else change the #include statement so the preprocessor finds it where it already is.

Where the preprocessor looks for included files is described here. One solution is to put the xyz.h file in a folder where the preprocessor is going to find it while following that search pattern.

Alternatively you can change the #include statement so that the preprocessor can find it. You tell us the xyz.cxx file is is in the 'code' folder but you don't tell us where you've put the xyz.h file. Let's say your file structure looks like this...

<some folder>\xyz.h
<some folder>\code\xyz.cxx

In that case the #include statement in xyz.cxx should look something like this..

#include "..\xyz.h"

On the other hand let's say your file structure looks like this...

<some folder>\include\xyz.h
<some folder>\code\xyz.cxx

In that case the #include statement in xyz.cxx should look something like this..

#include "..\include\xyz.h"

Update: On the other other hand as @In silico points out in the comments, if you are using #include <xyz.h> you should probably change it to #include "xyz.h"

Fatal error C1083: Cannot open include file but I have added directory to project

I have included the complete path to the header file under Project -> Properties -> C/C++ -> General -> Additional Include Directories.

It should be a directory path where detector.h header is located, not a file path.

Check that you have set this option for the active solution configuration. Sometimes it set for Debug, but not for Release and Release configuration is not able to build in such case.

Error C1083 Cannot open include file: 'IexBaseExc.h': No such file or directory

Aditional Include Directories can be specified per Configuration and Platform. On your screenshot you set include directory for Profile configuration and Win32 platform.

Check that proper include directory value set for configuration and platform you are building for. Active configuration can be found in Configuration Manager.

Error C1083 cannot open include file: 'vtkGUISupportQtModule.h' not such file or directory

These files are generated by CMake scripts when you are configuring VTK. You have to enable the option "Module_vtkGUISupportQt" in the cmake config of VTK to generate it (it is within the "advanced" options - in the CMakeGUI click the "advanced" checkbox to see it).

However, I'm not sure QT 4.8 will work, at least from the CMake it looks like that VTK 8.2 now supports only QT 5, it does not let me select other options.

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