Programming

Hello,

I'm trying to use gd with c++ in linux. Previously, I had already succeed using the gd lib in windows through gdwin32. Now I would like to run the program in linux but i'm not sure how to do it. I'm currently try running it in cygwin, but I couldn't compiled it. Any suggestion?

We need to see the code before we can see why it can't compile. It would also be helpful to see how you're trying to compile it. It'd even be helpful to know what the errors actually were. You've given us very little to go on here...

Sorry about that, here's the detail of my problem. I'm using the gd library to crop an image to a given width and height. In window, I include the gd.h as below:

using namespace std;

#include <float.h> //for DBL_MAX
#include <math.h>

#include <iostream>
#include <fstream>
#include <ctime>
#include "../gdwin32/gd.h"

#define _CANVAS_WIDTH 800
#define _CANVAS_HEIGHT 560
#define _TILE_WIDTH 25
#define _TILE_HEIGHT 20

I actually compiling it as: g++ -o main *.cpp ../gdwin32/libbgd.a and it works.

So now, I'm trying to run the same file in cygwin. I've already installed the zlib, libpng and gd-20.33 in the same folder as the source code which is main.cpp . I've also copied the gd.c and gd.h into the same folder as the source code. I've changed the include part of main.cpp to these:

#include <iostream>
#include <fstream>
#include <ctime>
#include "gd.h"

The problem occur when I run the makefile for gd which gave me these error messages:

extracting exported symbol list from `cygXpm-4.dll'
test -f .libs/impgen.c || \
sed -e "/^# \/\* impgen\.c starts here \*\//,/^# \/\* impgen.c ends here \
*\// { s/^# //;s/^# *$//; p; }" -e d < ./libtool > .libs/impgen.c
test -f .libs/impgen.exe || (cd .libs && \
if test "x" != "x" ; then -o impgen impgen.c ; \
else gcc -o impgen impgen.c ; fi)
.libs/impgen /usr/lib/../bin/cygXpm-4.dll > .libs/cygXpm-4.dll-def
generating import library for `cygXpm-4.dll'
dlltool --as=as --dllname cygXpm-4.dll --def .libs/cygXpm-4.dll-def --output-lib
.libs/libimp-cygXpm-4.a
grep: /usr/lib/libiconv.la: No such file or directory
/usr/bin/sed: can't read /usr/lib/libiconv.la: No such file or directory
libtool: link: `/usr/lib/libiconv.la' is not a valid libtool archive
make[2]: *** [libgd.la] Error 1
make[2]: Leaving directory `/home/shah/hsv/gd-2.0.33'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/shah/hsv/gd-2.0.33'
make: *** [all] Error 2

I'm not sure how to fix this and actually don't have a clue how to compile the program. Could anyone help me on how to use gd with c++ in linux?

You shouldn't be compiling gd yourself at all, you should install it and its headers on your system with the package manager for your distro. It will know what other packages it needs to install before it installs gd itself, which are probably several. Nor should you need to copy headers, you should make sure you're using the header files that your package manager installs. (the pkg-config command may be useful for this.)