Re: [Adobe-source-devel] Newbie question on GIL

[Foster T. B. <fbr...@ad...>]

Hi Haroon,

First off, welcome! And thanks for showing interest in GIL and the =20
Adobe Source Libraries. While I am not the primary developer of GIL =20
(I'll forward this to Lubomir and Hailin, who are) I suspect that =20
wrapping the #include expressions in extern "C" was the correct thing =20=

to do, as they are not C++ libraries and would not fare well under C+=20
+ name mangling conventions. I am puzzled, too, as to why you had to =20
make the change in the GIL headers themselves -- I'll leave that =20
question to be answered by the owners.

Blessings,
Foster


On Aug 14, 2006, at 9:44 PM, Haroon Khan wrote:

> Hi,
> Today is my first day of using GIL, and I was trying to compile and
> link the jpeg, png, and tiff libraries for a test program based on the
> sample program provided on the website. I kept getting linker errors,
> e.g.
>
> ...
> 1>hello_world.obj : error LNK2001: unresolved external symbol "int
> __cdecl jpeg_read_header(struct jpeg_decompress_struct *,unsigned
> char)" (?jpeg_read_header@@YAHPAUjpeg_decompress_struct@@E@Z)
> 1>hello_world.obj : error LNK2001: unresolved external symbol "void
> __cdecl jpeg_stdio_src(struct jpeg_decompress_struct *,struct _iobuf
> *)" (?jpeg_stdio_src@@YAXPAUjpeg_decompress_struct@@PAU_i
> ....
>
> until I went and edited the GIL header files and enclosed the #includ
> files for the jpeg, tiff, and png files with extern "C". Is this the
> correct way of doing this? or is there some build option in the
> libraries that I need to set.  I've already downloaded and created the
> static libraries for jpeg, tiff and png libs.
>
> I'm using Windows XP, and MSVC8.
>
>
> Thanks, Haroon
>
> ----------------------------------------------------------------------=20=

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--
Foster T. Brereton              <=E1=BC=B0=CF=87=CE=B8=CF=8D=CF=82><     =
         Romans =20
3:21-26
A d o b e   S o f t w a r e   T e c h n o l o g y   L a b
"What 99 percent of programmers need to know is not how to build =20
components but how to use them." -- Alexander Stepanov