I might have to apologize - I did not spot this was a continuation of a previous email chain :) I don't know why the context was lost
On Fri, 6 Jan 2023 at 10:07, Paul Harwood <[email protected]> wrote: > HI > > Might I politely suggest that you should think about asking effective > questions? It is not clear from this what you are actually asking. > > My interpretation is that the vcpkg thing is not the question (so it would > be nice if that was not the start of the email - it is FYI info). > > It looks like you are asking for help with PInvoke and Proj in C#. That is > not going to be an easy ask - since it is not a supported environment in > Proj and PInvoke is at best a dark art. > > It is not clear from the question if proj_create_crs_to_crs is a method > that works or one that does not work. If it does not work - what is the > problem/error message? > > As a general note - what I do since I do not want to have an unsupported > Pinvoke interface is to use GDAL. This has supported C# bindings and does > expose at least some of the Proj functionality as the OSR ABI. Not an ideal > solution but workable and supported. > > On Thu, 5 Jan 2023 at 20:27, Jason Dick <[email protected]> > wrote: > >> I used vcpkg. I used the instructions from the web site: >> >> https://proj.org/install.html >> >> It did take me awhile to get it working because I needed to customize the >> process. But now that the DLL is built by default, that's less necessary. >> >> I only use a handful of functions and there are some that I didn't know >> how to convert to C#. Here's an example of one import that I use. >> >> private const String ProjDLL = "proj.dll"; >> >> // PJ *proj_create_crs_to_crs(PJ_CONTEXT *ctx, const char *source_crs, >> const char *target_crs, PJ_AREA *area) >> [DllImport(ProjDLL, CallingConvention = CallingConvention.Cdecl, CharSet >> = CharSet.Ansi, BestFitMapping = false, ThrowOnUnmappableChar = true)] >> private static extern IntPtr proj_create_crs_to_crs(IntPtr ctx, String >> source_crs, String target_crs, IntPtr area); >> _______________________________________________ >> PROJ mailing list >> [email protected] >> https://lists.osgeo.org/mailman/listinfo/proj >> >
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