Solve the problem of "unable to open source file" xx.h "in the custom header file on vs from the source

Hello everyone , I meet you again , I'm your friend, Quan Jun .

I wrote a header file myself , Pass in the main function #include When quoting Unable to open the source file , Check online , What most people do is ： Right click on the item -> attribute ->VC++ Catalog -> Contains the directory -> Pull down shear head -> edit , Add... In the dialog box $(ProjectDir).

Problem solving ！ But what is the principle ？ Through further research , Find that the problem is that you are confused #include”xx.h” and #include<xx.h> Usage of ,

#include<xx.h> It means to find files directly from the function library provided by the compiler , The compiler searches from the standard library path .xxh

include”xx.h” It means to find from the customized file first , If not, look for the file from the function library , The compiler searches from the user's working path xx.h If we pass <> Reference the header file written by yourself , There is bound to be a problem that the source file cannot be found , Because our files are in the user directory , The above solution is essentially by appending the user directory to the compiler search scope , In fact, through <> Switch to ” “ You can solve the problem .

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