Dlopen on Windows via dlfcn-win32

mkitti · December 13, 2023, 12:03am

I notice that std.c.dlopen exists as part of the std API but this does not have an implementation on Windows.

Would it make sense to incorporate the following project into Zig to make it easier to write cross platform code that loads a dynamic library?

dude_the_builder · December 13, 2023, 12:43am

Have you checked out zig/lib/std/dynamic_library.zig at master · ziglang/zig · GitHub ?

mkitti · December 13, 2023, 4:17am

I did see it, but I was not sure that I was looking at public API.

One big difference is how dlfcn-win32 sets up the DLL search path:

github.com

dlfcn-win32/dlfcn-win32/blob/048bff80f2bd00bb651bcc3357cb6f76e3d76fd5/src/dlfcn.c#L418


      
          hCurrentProc = GetCurrentProcess( );

          

          if( MyEnumProcessModules( hCurrentProc, NULL, 0, &dwProcModsBefore ) == 0 )

              dwProcModsBefore = 0;

          

          /* POSIX says the search path is implementation-defined.

           * LOAD_WITH_ALTERED_SEARCH_PATH is used to make it behave more closely

           * to UNIX's search paths (start with system folders instead of current

           * folder).

           */

          hModule = LoadLibraryExA( lpFileName, NULL, LOAD_WITH_ALTERED_SEARCH_PATH );

          

          if( !hModule )

          {

              save_err_str( lpFileName, GetLastError( ) );

          }

          else

          {

              if( MyEnumProcessModules( hCurrentProc, NULL, 0, &dwProcModsAfter ) == 0 )

                  dwProcModsAfter = 0;