如何包含外部库？

Question

Hi i would like to include a external library call NTL. its in the path as followed:

#include "WinNTL-5_4_2/include/NTL/tools.h"

My file is key.cpp and its reside in the same folder as NTL . but when i compile, it came up with another error which is ..

In file included from keygen.cpp:6:0:
WinNTL-5_4_2/include/NTL/tools.h:5:24: fatal error: NTL/ctools.h: No such file or directory
compilation terminated.

As its need another file call ctools.h, how do i includes tools.h to make ctools.h work also

I tried type

me@ubuntu:~/GG$ g++ keygen.cpp -o keygen -l WinNTL-5_4_2/include/
keygen.cpp:6:23: fatal error: NTL/tools.h: No such file or directory

but it doesnt work still.

Answer 1

Based on the error message, you should try changing your include to:

#include "NTL/tools.h"

and make sure that WinNTL-5_4_2/include is in your compiler's search path for include files.

Answer 2

You need to add the root directory as part of your project's search path for include files. It depends on your environment exactly how to do this, but there are usually two search paths -- one for include files and another for compiled libraries. Set that with the directory that contains the WinNTL-5_4_2 directory and you should be golden.

Answer 3

您必须在编译器的包含路径中添加“ fullpath / WinNTL-5_4_2 / include”（通过-I表示gcc或在Visual Studio项目的包含路径列表中）期望ctools.h存在于“ ...”中。 / WinNTL-5_4_2 / include / NTL”