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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