Calypso: Direct and full interfacing to C++

[Kelly via Digitalmars-d-announce]

On Tuesday, 19 May 2015 at 08:09:33 UTC, Suliman wrote:
> modmap (C++) "<gdalwarper>";
>
> import std.stdio;
>
> void main()
> {
> 	GDALDatasetH  hSrcDS, hDstDS;
> 	GDALAllRegister();
> 	writeln("hello");
> }
>
>
> error:
> app.d(7): Error: undefined identifier GDALDatasetH
> app.d(7): Error: undefined identifier GDALDatasetH
> app.d(8): Error: undefined identifier GDALAllRegister


Hello Suliman,

I have translated the GDAL example ( 
http://www.gdal.org/warptut.html ) and got it to run...woohoo!! I 
needed to apply the fix from Elie last night (and the pull 
request from me that hasn't been accepted yet), so this won't 
work for you yet, unfortunately...soon hopefully.

For comparison I have posted the translation here ( 
http://pastebin.com/VwrVeBJ3 ), but it may be a day or two yet 
before Calypso can compile it out-of-the-box, even if my pull 
requrest is accepted today. There is still one outstanding error 
that I couldn't fix. I had to cheat and modify a system file (not 
a good thing to ask others to do, obviously)!!

As you can see the differences between the two examples are 
pretty minimal. Things like using '.' instead of '->'. Having to 
'new' the GDALWarpOperation, and another slightly subtle change 
-- we need to use an ampersand for the function pointer 
assignment of GDALTermProgress/GDALAGenImgProjTransform.

Also notice that we needed to explicitly modmap cpl_conv.h to get 
access to CPLMalloc. In addition, we have to be explicit about 
which structs/classes to 'import'.

I have not tested this on Windows! I haven't even built Calypso 
on Windows yet...so I may not be able to help much with Windows 
errors. Just so you know.

Thanks,
Kelly