David,
I'm very sorry in the delay for authorizing your post to the list.
It's not the first time a legitimate message has slipped by in the
mountains of spam that it gets. I'm considering shutting the lists
down and just using the Forums.
Thanks for downloading PNGwriter.
Your second try is more appropriate, but I'm not sure where you have
installed libpngwriter.a, the actual compiled PNGwriter library. It
should be in -L/Users/dbw/lib. Is that the case?
Again, sorry for the delay.
Paul
On 3/24/07, David Weiland <[EMAIL PROTECTED]> wrote:
> Hello.
> I'm having trouble getting the basic pngwriter program
> #include <pngwriter.h>
>
> int main()
> {
> pngwriter image(200, 200, 1.0, "out.png");
> image.plot(30, 40, 1.0, 0.0, 0.0);
> image.close();
>
> return 0;
> }
> to work. I believe I have installed pngwriter and libpng correctly (but I
> must say I am very very new to Unix and am not sure what exactly I have
> done). By the way, Users/dbw has the folders "libpng-1.2.12" and
> "pngwriter-0.5.3". Users/dbw/include seems to have the header files from
> these:
> libpng12 png.h pngconf.h pngwriter.h
> So when I try to compile the above program (that I've called prog.cpp) I
> keep getting errors. Given that I have a foggy idea of the meaning of these
> flags I shown you a few things I tried along with the errors created. Any
> suggestions would be greatly appreciated. David
>
> entering:
> g++ prog.cpp -o prog -I/usr/local/include -L/usr/local/lib -lpng -lpngwriter
> -lz -DNO_FREETYPE
> gives:
> prog.cpp:1:25: error: pngwriter.h: No such file or directory
> prog.cpp: In function 'int main()':
> prog.cpp:5: error: 'pngwriter' was not declared in this scope
> prog.cpp:5: error: expected `;' before 'image'
> prog.cpp:6: error: 'image' was not declared in this scope
>
> entering:
> g++ prog.cpp -o prog -I/Users/dbw/include -L/Users/dbw/lib -lpng -lpngwriter
> -lz -DNO_FREETYPE
> gives:
> /usr/bin/ld: can't locate file for: -lpngwriter
> collect2: ld returned 1 exit status
>
> entering:
> g++ prog.cpp -o prog -I/Users/dbw/include -L/Users/dbw/lib -DNO_FREETYPE
> gives:
> /usr/bin/ld: Undefined symbols:
> pngwriter::plot(int, int, double, double, double)
> pngwriter::close()
> pngwriter::pngwriter(int, int, double, char const*)
> pngwriter::~pngwriter()
> collect2: ld returned 1 exit status
>
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