json-c compile in window xp

[RafsanjaniRahman]

Hi, Just want to know if json-c lib can support compilation in window xp?

[hawicz]

If you're asking whether itks possible to build json-c, I have no idea. You'll likely need to make some adjustments, and if they're minimal enough I might accept them as pull requests. I suspect this will largely depend on how you're trying to build (Visual Studio, cygwin gcc, mingw?).
However, insofar as any platform can be considered "supported", Windows XP is not on that list and you'll be largely on your own making it work. I'll be happy to help if I can, but I certainly don't have an XP machine anywhere and I suspect there are few who do.

[jamesmyatt]

It certainly used to be possible to compile on Windows: https://ci.appveyor.com/project/Nzbuu/json-c/build/master.27

However, it now looks like this is broken. https://ci.appveyor.com/project/Nzbuu/json-c/build/master.29

For reference, the error message is:

     c:\projects\json-c\json_object.c(727): error C2664: 'int json_object_double_to_json_string_format(json_object *,printbuf *,int,int,const char *)': cannot convert argument 5 from 'void *' to 'const char *' [C:\projects\json-c\json-c.vcxproj]

[hawicz]

Seems to be c++ stupidity not allowing void. Do you know how to get that to build there as a C program?

[jkaster]

This is an issue for both Win32 and x64 platforms. I tried limiting scope to Win32 but the problem still occurs.
C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\include\stdio.h(346) : see declaration of '_snprintf' json_object.c(723): error C2664: 'int json_object_double_to_json_string_format(json_object *,printbuf *,int,int,const char *)' : cannot convert argument 5 from 'void *' to 'const char *' [d:\dev\json-c\json-c.vcxproj] Conversion from 'void*' to pointer to non-'void' requires an explicit cast

I tried building from the command-line:
msbuild json-c.vcxproj /p:configuration=debug /p:platform=Win32
msbuild json-c.vcxproj /p:configuration=release /p:platform=Win32

[jkaster]

It compiles if you change json_object.c lines 722:723 from:
return json_object_double_to_json_string_format(jso, pb, level, flags, jso->_userdata);

to
return json_object_double_to_json_string_format(jso, pb, level, flags, (char *)jso->_userdata);

[hawicz]

It seems you're getting the "error" because you're compiling it as a c++ program, not a c one.
If you can figure out how to get VS to build this as actual C code, and eliminate the problem that way, then I'll be happy to apply that change, but I have little desire to litter the code with casts to cater to attempts to build the code as something it isn't.

[sdrsdr]

windows compile error is fixed in pull request #277