无法打开包含文件：“unistd.h”：没有这样的文件或目录

Question

After having installed libpng into my computer, I've included it into my project using #include <png.h> on a Windows 7 SP1 plateform and using Visual Studio Ultimate 2013.

But at build time, I'm getting this error:

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

How do I please to fix this? I haven't found yet any solution in the.net?

Answer 1

The "uni" in unistd stands for "UNIX" - you won't find it on a Windows system.

Most widely used, portable libraries should offer alternative builds or detect the platform and only try to use headers/functions that will be provided, so it's worth checking documentation to see if you've missed some build step - eg perhaps running "make" instead of loading a ".sln" Visual C++ solution file.

If you need to fix it yourself, remove the include and see which functions are actually needed, then try to find a Windows equivalent.

Answer 2

If you're using ZLib in your project, then you need to find :

#if 1

in zconf.h and replace(uncomment) it with :

#if HAVE_UNISTD_H /* ...the rest of the line

If it isn't ZLib I guess you should find some alternative way to do this. GL.

Answer 3

Change your C++ standard to C++17 from your project directory. because you do not need to unistd.h in C++17 standard in VS.