[Solved] Struggling to run my first Magick++ program

[h1b1]

Hi Everyone,

I want to run a simple c++ program that includes the line

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#inlcude <Magick++>

but the compiler throws the error

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fatal error: Magick++.h: No such file or directory
compilation terminated.

For installation, I cloned ImageMagick from GitHub to my home directory, and then ran ./configure, make and make install.

OS: macOS Sierra
Compiler: g++
ImageMagick version: 7
Also used Homebrew to install libxml2 and other missing libraries.

Any help would be much appreciated! Thanks!

[snibgo]

It might help if you showed the compiler command you used. This should contain something that says where to find include files.

[h1b1]

Thanks for the reply.

The compiler command was simply g++ test.cpp

When I tried

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 g++ -I /usr/local/include/ImageMagick-7/ test.cpp

I got the following:

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In file included from /usr/local/include/ImageMagick-7/Magick++/Include.h:14:0,
                 from /usr/local/include/ImageMagick-7/Magick++.h:10,
                 from test.cpp:1:
/usr/local/include/ImageMagick-7/MagickCore/magick-config.h:29:3: warning: #warning "you should set MAGICKCORE_QUANTUM_DEPTH to sensible default set it to configure time default" [-Wcpp]
 # warning "you should set MAGICKCORE_QUANTUM_DEPTH to sensible default set it to configure time default"
   ^
/usr/local/include/ImageMagick-7/MagickCore/magick-config.h:30:3: warning: #warning "this is an obsolete behavior please fix your makefile" [-Wcpp]
 # warning "this is an obsolete behavior please fix your makefile"
   ^
/usr/local/include/ImageMagick-7/MagickCore/magick-config.h:52:3: warning: #warning "you should set MAGICKCORE_HDRI_ENABLE to sensible default set it to configure time default" [-Wcpp]
 # warning "you should set MAGICKCORE_HDRI_ENABLE to sensible default set it to configure time default"
   ^
/usr/local/include/ImageMagick-7/MagickCore/magick-config.h:53:3: warning: #warning "this is an obsolete behavior please fix yours makefile" [-Wcpp]
 # warning "this is an obsolete behavior please fix yours makefile"
   ^
Undefined symbols for architecture x86_64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

[snibgo]

Can you successfully build the supplied demo programs? Or have you skipped that stage?

The official docs http://www.imagemagick.org/script/magick++.php contain a build line that contain a couple of calls to Magick++-config. Have you deliberately chosen not to do this?

[h1b1]

Can you successfully build the supplied demo programs?

Yes, but I think that was my mistake.

I thought I had to run the line

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c++ `Magick++-config --cxxflags --cppflags` -O2 -o demo demo.cpp \
  `Magick++-config --ldflags --libs`

and

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export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

with some demo file as a configuration step only once, and didn't realize that's how to compile c++ programs that use <Magick++.h>.

So now my problem is solved! Thanks a lot for your help!

[tbone]

I am having similar problem. When I try to run the sample code in VS environment, I provided the "include" and "lib" path properly but I still get linker errors like this, any ideas? I added the install folder "C:\Program Files\ImageMagick-7.0.6-Q16" to "PATH" of the project, assuming it is dll related issue and it isnt solving either.


Error LNK2019 unresolved external symbol "void __cdecl Magick::InitializeMagick(char const *)" (?InitializeMagick@Magick@@YAXPEBD@Z) referenced in function main ImageMagic_101