Linking ImageMagick with g++ on OS 10.9.5 - c++

For a C++ project I'd like to use ImageMagick to manipulate images. To test is out, my test1.cpp is just bare-bones :
#include <iostream>
#include <Magick++.h>
using namespace Magick;
int main(int argc, char * argv[]){
return 0;}
And I've been trying to compile it in the terminal by using :
g++ `Magick++-config --cxxflags --cppflags` -O2 -Wall -o test1 test1.cpp `Magick++-config --ldflags --libs`
and I get :
fatal error: 'Magick++.h' file not found
I've installed the latest version of ImageMagick (convert and identify work when called from the terminal) and the first lines of my .bash_profile look like this :
export MAGICK_HOME="/opt/ImageMagick-6.8.9"
export PATH="/System/Library/Frameworks:$MAGICK_HOME/bin:$PATH"
export DYLD_LIBRARY_PATH="$MAGICK_HOME/lib/"
export PKG_CONFIG_PATH="/usr/local/lib/pkgconfig:/opt/X12/lib/pkgconfig/:$MAGICK_HOME/lib/pkgconfig"
All path are correct and I have already used pkg-config to successfully link a c++ program to cairo.
What am I doing wrong ? What's the simpler way to use ImageMagick in a c++ program ?
(I use vim and the terminal and do not wish to use an IDE at this point).
Thanks in advance for any help !
-- EDIT --
Here's what's returned by Magick+-config (--cxxflags and --cppflags) :
-DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16 -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16 -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16 -I$MAGICK_HOME/include/ImageMagick-6
And by --ldflags and --libs :
-L$MAGICK_HOME/lib -lMagick++-6.Q16 -lMagickWand-6.Q16 -lMagickCore-6.Q16

Related

How to use LLVM library in c++ Xcode project?

I'm loosely following the tutorial to implement Kaleidoscope on the LLVM website, and I'm at the point where I need to actually use the LLVM library for code generation. I've installed LLVM 13 using homebrew (brew install llvm), but I can't figure out how to use it in a c++ project in Xcode. I just get the error 'llvm/whatever/whatever' file not found for every file I try to include:
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Verifier.h"
I've tried adding the include folder (/opt/homebrew/Cellar/llvm/13.0.1_1/include for me) to the header search paths in Xcode, which seems to do something but I end up with the error Undefined symbol: llvm::DisableABIBreakingChecks, and hundreds of different warnings.
All I want is to be able to use LLVM code generation in a small c++ project. Is there any simple way to do this?
I'm also doing that tutorial. I'll tell you how I got it to work, but since I'm not an LLVM expert, I don't know if this is the best way.
I checked out and built LLVM from source, as described here. Installing with brew like you did should also work fine.
Next, I looked at the build command they give in the tutorial:
clang++ -g -O3 toy.cpp `llvm-config --cxxflags --ldflags --system-libs --libs core`
-o toy
I can run that llvm-config command from my build directory and it gives me the flags that I need to somehow give to Xcode.
> bin/llvm-config --cxxflags --ldflags --system-libs --libs core
-I/Users/rob/Foo/llvm-project/llvm/include
-I/Users/rob/Foo/llvm-project/build/include
-std=c++14 -fno-exceptions -fno-rtti
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-L/Users/rob/Foo/llvm-project/build/lib
-Wl,-search_paths_first -Wl,-headerpad_max_install_names
-lLLVMCore -lLLVMRemarks -lLLVMBitstreamReader
-lLLVMBinaryFormat -lLLVMSupport -lLLVMDemangle
-lm -lz -lcurses -lxml2
I put those -I paths in the HEADER_SEARCH_PATHS build setting, and the -L path in LIBRARY_SEARCH_PATHS. In Xcode those values are a list of paths, so you add the paths without the -I or -L part. I then put the -l library arguments in OTHER_LDFLAGS, and the -D arguments in OTHER_CPLUSPLUSFLAGS.
After that, it compiled and ran from Xcode. I did not yet translate all of the output from llvm-config into Xcode build settings. For example, I did nothing about these:
-std=c++14 -fno-exceptions -fno-rtti
-Wl,-search_paths_first -Wl,-headerpad_max_install_names
Remains to be seen if that will cause problems later.

g++ - Python.h: No such file or directory

I'm trying to make a C++ script that will run some simple Python code:
// t.cpp
#include <Python.h>
int main(int argc, char* argv[])
{
Py_Initialize();
PyRun_SimpleString("print('TEST PASSED')");
Py_Finalize();
return 0;
}
Upon running g++ t.cpp, I get the error:
t.cpp:1:20: fatal error: Python.h: No such file or directory
compilation terminated
I've found many similar questions, all specific to an IDE or other development software, or were solved by installing python3-dev. The python3-dev package is already installed, and I even tried manually including the header when attempting to compile:
g++ t.cpp -I ~/.virtualenvs/MainEnv/include/python3.5m/Python.h
g++ t.cpp -I /usr/include/python3.5m/Python.h
Neither changes anything.
How can I fix this error?
UPDATE: I found that using g++ t.cpp -I /usr/include/python3.5/ seems to include the header, but then it runs into more errors:
t.cpp:(.text+0x10): undefined reference to `Py_Initialize'
t.cpp:(.text+0x1f): undefined reference to `PyRun_SimpleStringFlags'
t.cpp:(.text+0x24): undefined reference to `Py_Finalize'
collect2: error: ld returned 1 exit status
I've set up a similar example on my github
g++ t.cpp is missing a few things:
Tell g++ where the headers are for cpython (by -I/path/to/headers/)
Tell g++ to link against libpython (by -lpython3.5m)
You can also retrieve these flags with pkg-config
$ pkg-config python-3.5 --libs --cflags
-I/usr/include/python3.5m -I/usr/include/x86_64-linux-gnu/python3.5m -lpython3.5m
Your commandline should look something like g++ -I/usr/include/python3.5m t.cpp -lpython3.5m
#include <...> is for includes that come with the compiler.
Use #include "Python.h" for any other includes.
Run the following commands to compile your code:
mytest.cpp:
#include <Python.h>
int main(int argc, char* argv[])
{
Py_Initialize();
PyRun_SimpleString("print('TEST PASSED')");
Py_Finalize();
return 0;
}
Compile:
$ g++ mytest.cpp `pkg-config python3-embed --libs --cflags` -o mytest
$ ./mytest

Graphicsmagick C++ API

I want to use the C++ API for graphicsmagick
I need to convert image data directly from OpenCV and use graphicsmagick to save the file as tiff with group 4 compression
The command line
gm convert input -type bilevel -monochrome -compress group4 output.tif
Could anyone provide some code (see the above command line) to simply convert the output from OpenCV to tiff with group 4 compression
I'm new to C++ :)
testing graphicsmagick
I'm trying to make graphicsmagick work. Found a very simple code in the docs
I can't find Magick++.h
locate /Magick++.h returns nothing
but graphicsmagick is installed
# gm -version
GraphicsMagick 1.3.20 2014-08-16 Q8 http://www.GraphicsMagick.org/
code
/*
* Compile
* g++ gm_test.cpp -o gm_test `GraphicsMagick++-config --cppflags --cxxflags --ldflags --libs`
*/
#include <Magick++.h>
using namespace std;
using namespace Magick;
int main(int argc, char **argv){
InitializeMagick(*argv);
Image image( "100x100", "white" );
image.pixelColor( 49, 49, "red" );
image.write( "red_pixel.png" );
return 0;
}
compile
# g++ gm_test.cpp -o gm_test `GraphicsMagick++-config --cppflags --cxxflags --ldflags --libs`
-bash: GraphicsMagick++-config: command not found
gm_test.cpp:6:22: fatal error: Magick++.h: No such file or directory
#include <Magick++.h>
^
compilation terminated.
Updated Answer
Try looking for a file called GraphicsMagick-config under the directory where you installed GraphicsMagick like this:
find /usr -name "GraphicsMagick-config"
When you find that, you can ask it to tell you the compiler include flags and linker flags like this:
/usr/some/path/GraphicsMagick-config --cflags --libs
Then you can compile with:
gcc $(/usr/some/path/GraphicsMagick-config --cflags --libs) somefile.c -o somefile
Original Answer
Look in the directory where you installed GraphicsMagick for a file ending in .pc, which is the pkg-config file, e.g.
find /usr/local -iname "graphic*.pc"
Then pass this file to pkg-config to get the CFLAGS and LIBS you should use for compiling. So, if your graphicsmagick.pc is in /usr/local/Cellar/graphicsmagick/1.3.23/lib/pkgconfig/GraphicsMagick.pc, use:
pkg-config --cflags --libs /usr/local/Cellar/graphicsmagick/1.3.23/lib/pkgconfig/GraphicsMagick.pc
which will give you this:
/usr/local/Cellar/graphicsmagick/1.3.23/lib/pkgconfig/GraphicsMagick.pc
-I/usr/local/Cellar/graphicsmagick/1.3.23/include/GraphicsMagick -L/usr/local/Cellar/graphicsmagick/1.3.23/lib -lGraphicsMagick
Then you would compile with:
gcc $(pkg-config --cflags --libs somefile.c -o somefile
i don't know if it's helpful, last day i have the same error :no magick++.h when i compile ImageMagick (not graphicsmagick).
so i follows the steps in a official website to reinstall ImageMagick and finally i succeed.web:
1 http://www.imagemagick.org/script/install-source.php
2 http://www.imagemagick.org/script/magick++.php
i download the latest source code(ImageMagick6.9) in centOS-6.5
and then ./configure, make, make install.
i hope it's helpful.
On Ubuntu the GraphicsMagick++-config program you are using to get compile flags is correctly part of the same package which includes Magick++.h. Trying to run it tell you where to find it:
$ g++ gm_test.cpp -o gm_test `GraphicsMagick++-config --cppflags --cxxflags --ldflags --libs`
The program 'GraphicsMagick++-config' is currently not installed. You can install it by typing:
sudo apt-get install libgraphicsmagick++1-dev
gm_test.cpp:6:22: fatal error: Magick++.h: No such file or directory
compilation terminated.
So do what it says:
$ sudo apt-get install libgraphicsmagick++1-dev
Try the compile again and you will get a different error because GraphicsMagick++-config is linking to an uninstalled and unneeded library:
$ g++ gm_test.cpp -o gm_test `GraphicsMagick++-config --cppflags --cxxflags --ldflags --libs`
/usr/bin/ld: cannot find -lwebp
collect2: error: ld returned 1 exit status
You can manually specify the libs and the compile and link works:
$ g++ gm_test.cpp -o gm_test -I/usr/include/GraphicsMagick -Wall -g -fno-strict-aliasing -O2 -pthread -lGraphicsMagick++ -lGraphicsMagick -ljbig
$ ./gm_test
Or you can install the required library:
$ sudo apt-get install libwebp-dev

Cross Compile OpenCV C++ application ARM

I have read all of the related questions with no success trying anything mentioned anywhere. I am new to cross-compiling and have been working on this for over a week with no progress. So please forgive me if you think I am stupid or have overlooked something.
So I have an application running in C++ that works great on my development computer running Ubuntu 14.04 x64. I am trying to cross compile for my Banana Pro running Lubuntu. Based on the documentation from Lemaker I am supposed to cross compile using "arm-linux-gnueabihf-"
So far the farthest I have been able to get is to :
/usr/local/opencv-arm/usr/local/lib/libopencv_calib3d.so: file not recognized: File format not recognized
collect2: error: ld returned 1 exit status
I get this error regardless of what command I run, Here is a list of commands I have tried:
arm-linux-gnueabihf-g++ `arm-linux-gnueabihf-pkg-config arm-opencv --cflags` -Wall test.cpp -o vis-300 `arm-linux-gnueabihf-pkg-config arm-opencv --libs`
arm-linux-gnueabihf-g++ `pkg-config arm-opencv --cflags` -Wall test.cpp -o vis-300 `pkg-config arm-opencv --libs`
arm-linux-gnueabihf-gcc `pkg-config arm-opencv --cflags` -Wall test.cpp -o vis-300 `pkg-config arm-opencv --libs`
arm-linux-gnueabihf-g++ `pkg-config arm-opencv --cflags` test.cpp -o vis-300 `pkg-config arm-opencv --libs`
And there have been many more commands before those with different errors such as:
arm-linux-gnueabihf-gcc: error trying to exec 'cc1plus': execvp: No such file or directory
arm-linux-gnueabihf-cpp fatal error too many input files
I have tried with just normal arm-linux-gnueabihf-gcc/g++, 4.6, 4.7, and 4.8
I have built opencv making small changes for hf using these 2 guides and both produced the same results:
http://processors.wiki.ti.com/index.php/Building_OpenCV_for_ARM_Cortex-A8
http://www.ridgesolutions.ie/index.php/2013/05/24/building-cross-compiling-opencv-for-linux-arm/
and not included in either I install it using this command because it will conflict with my current x86_64 install:
sudo make install DESTDIR=/usr/local/opencv-arm
Also the above pkg-config lines point to my custom pkg config file named arm-opencv.pc
# Package Information for pkg-config
prefix=/usr/local/opencv-arm/usr/local
exec_prefix=${prefix}
libdir=
includedir_old=${prefix}/include/opencv
includedir_new=${prefix}/include
Name: OpenCV-arm
Description: Open Source Computer Vision Library
Version: 2.4.10
Libs: ${exec_prefix}/lib/libopencv_calib3d.so ${exec_prefix}/lib/libopencv_contrib.so ${exec_prefix}/lib/libopencv_core.so ${exec_prefix}/lib/libopencv_features2d.so ${exec_prefix}/lib/libopencv_flann.so ${exec_prefix}/lib/libopencv_gpu.so ${exec_prefix}/lib/libopencv_highgui.so ${exec_prefix}/lib/libopencv_imgproc.so ${exec_prefix}/lib/libopencv_legacy.so ${exec_prefix}/lib/libopencv_ml.so ${exec_prefix}/lib/libopencv_nonfree.so ${exec_prefix}/lib/libopencv_objdetect.so ${exec_prefix}/lib/libopencv_ocl.so ${exec_prefix}/lib/libopencv_photo.so ${exec_prefix}/lib/libopencv_stitching.so ${exec_prefix}/lib/libopencv_superres.so ${exec_prefix}/lib/libopencv_ts.a ${exec_prefix}/lib/libopencv_video.so ${exec_prefix}/lib/libopencv_videostab.so -lrt -lpthread -lm -ldl
Cflags: -I${includedir_old} -I${includedir_new}
Anyways I have tried a lot of stuff short of just installing everything on the board itself and compiling there. Any help is much appreciated and keep in mind I have never successfully cross-compiled before. I always give up and compile on the board.

Can't get a Qt Hello World to work

I've compiled Qt on OSX Lion using the instructions provided at this official guide. I've then tried compiling the following Hello World with gcc hello_world.cpp -o hello_world
#include <QApplication>
int main(int argc, char **argv)
{
QApplication app (argc, argv);
return app.exec();
}
I've got the following error:
hello_world.cpp:1:10: fatal error: 'QApplication' file not found
#include <QApplication>
^
1 error generated.
try instead #include <QtGui/QApplication>
Use -I option of gcc to give additional include locations.
gcc hello_world.cpp -I/path-to-qt/include -o hello_world
If you use it like that, you have to use your includes like this:
#include <QtGui/QApplication>
if you want your includes to be shorter like #include <QApplication>, you can give multiple include folders like this:
gcc hello_world.cpp -I/path-to-qt/include/QtCore -I/path-to-qt/include/QtGui -o hello_world
But that is not all. You also have to give library directories and which libraries to link to, which is done like this:
gcc hello_world.cpp -I/path-to-qt/include/QtCore -I/path-to-qt/include/QtGui -o hello_world -L/path-to-qt/lib -lQtCore -lQtGui
It is also better to use g++, since you are using C++.
g++ hello_world.cpp -I/path-to-qt/include/QtCore -I/path-to-qt/include/QtGui -o hello_world -L/path-to-qt/lib -lQtCore -lQtGui
Try with g++ -I<path_to_include_directory> -L<path_to_library_dir> -lQtCore.
For example, in my Debian I would do: g++ -I/usr/local/include/Qt4 -L/usr/local/lib -lQtCore -lQtGui whatever.cpp
EDIT: Thanks to #erelender to point out that QApplication is in the QtGui library and that it depends on QtCore.
What if you try to add additional include path for gcc with using -I flags? Something like:
gcc -I/usr/local/Qt-5.1.1/include hello_world.cpp -o hello_world
Not sure about the path in mac, but on Linux the class QApplication
is defined at following location (qt4)
/usr/include/qt4/QtGui/qwindowdefs.h
Do you have something similar on Mac?
If you are building from command line, including a header file with gcc can be done with following switch
-I<path to .h file>