Cannot open include file with Visual Studio

Question

I have recently gone from Code  Blocks to Visual Studio  and in Code  Blocks one could just add a class and then include it straight away  However  whenever I do the same in Visual Studio with the following statement   include  quot includedFile h quot   or  include  quot include includedFile h quot   It doesn t work and instead I get the error   cannot open include file   includedFile h   no such file or directory   Is there some box or setting that I have to tick  Or do I have to add each header as a dependency manually  Here is the code for the class in question  Public h       pragma once     class Public               public              static const int SCREEN WIDTH 1000              static const int SCREEN HEIGHT 1250              Public void                Public void           Public cpp       include  quot Public h quot        Public  Public void                    Public   Public void               How it is being included       include  quot Public h quot

User · Answer

I found this post because I was having the same error in Microsoft Visual C++. (Though it seems it's cause was a little different, than the above posted question.)

I had placed the file, I was trying to include, in the same directory, but it still could not be found.

My include looked like this: #include <ftdi.h>

But When I changed it to this: #include "ftdi.h" then it found it.

User · Answer

By default  Visual Studio searches for headers in the folder where your project is   ProjectDir  and in the default standard libraries directories  If you need to include something that is not placed in your project directory  you need to add the path to the folder to include   Go to your Project properties  Project -  Properties -  Configuration Properties -  C C   -  General  and in the field Additional Include Directories add the path to your  h file   You can  also  as suggested by Chris Olen  add the path to VC   Directories field

User · Answer

Go to your Project properties  Project -  Properties -  Configuration Properties -  C C   -  General  and in the field Additional Include Directories add the path to your  h file    And be sure that your Configuration and Platform are the active ones  Example  Configuration  Active Debug  Platform  Active Win32

User · Answer

You need to set the path for the preprocessor to search for these include files  if they are not in the project folder   You can set the path in VC   Directories  or in Additional Include Directories  Both are found in project settings

User · Answer

I had this same issue going from e g gcc to visual studio for C programming  Make sure your include file is actually in the directory -- not just shown in the VS project tree  For me in other languages copying into a folder in the project tree would indeed move the file in  With Visual Studio 2010  pasting into  Header Files  was NOT putting the  h file there   Please check your actual directory for the presence of the include file  Putting it into the  header files  folder in project solution explorer  was not enough

User · Answer

If your problem is still there it s certainly because you are trying to compile a different version from your current settings   For example if you set your Additional Include Directories in Debug x64  be sure that you are compiling with the same configuration   Check this  Build  gt  Configuration Manager     gt  There is problably something like this in your active solution configuration  Debug x86  Win32  platform

User · Answer

If you ve tried the other answers and your include file still can t be found  here are some additional debugging steps and sanity-checks    Ensure that you are building to a platform that is supported by your code    If not  consider removing this platform as a target  Verify that the filename path is correct   Modify your source code to  include the whole absolute path of the header file instead  and see if the file can be found now   If not  copy-paste the path from your source code into a command line to validate that the file exists at that full path with no typos   Open the header file to ensure you have read access    Change the source code back when done    If you ve already added the path to Additional Include Directories  try clicking the drop-down combo box for Additional Include Directories  and select  lt Edit    gt    This will show you evaluated values of paths    If it does not show the correct evaluated values  variables in your path might not be set   Click Macros gt  gt  to see variables    Copy-paste the evaluated path into windows explorer to validate that the path exists   Create a new empty C    Windows Console Application  project   Set just the one Include Directory  and  include just the one file in your main cpp  and see if that builds

User · Answer

For me  it helped to link the projects current directory as such   In the properties -  C   -  General window  instead of linking the path to the file in  additional include directories   Put     and uncheck  inheret from parent or project defaults    Hope this helps

[c++] Cannot open include file with Visual Studio

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