Windows installation

[simonflick]

Could you add installation instructions for Windows?
I'm new to this and tried installing it like go-sdl2 but I always get ERROR_MISSING_DELEGATE: NoDecodeDelegateForThisImageFormat 'JPEG' when opening images. Here is how I installed it:

• pacman -S mingw-w64-x86_64-imagemagick using MSYS2 Shell
• go get gopkg.in/gographics/imagick.v2/imagick using CMD
• got error that "pkg-config.exe" was not found so I downloaded it and added it to PATH (https://sourceforge.net/projects/pkgconfiglite/files/)
• tried go get again and it worked

GetVersion() shows ImageMagick 6.9.3-7 Q16 x86_64 2016-04-05 http://www.imagemagick.org and using ImageMagick via CMD like this works perfect: convert test.png test.jpg

[justinfx]

Are these working instructions? I'm happy to add them if they are. I don't
use Windows so I can't personally confirm a Windows install process. It
would need to be contributed by windows users.

On Sat, 14 May 2016 3:46 AM Dampfnudeln notifications@github.com wrote:

Could you add installation instructions for Windows?
I'm new to this and tried installing it like go-sdl2 but I always get ERROR_MISSING_DELEGATE:
NoDecodeDelegateForThisImageFormat 'JPEG' when opening images. Here is
how I installed it:

• pacman -S mingw-w64-x86_64-imagemagick using MSYS2 Shell
• go get gopkg.in/gographics/imagick.v2/imagick using CMD
• got error that "pkg-config.exe" was not found so I downloaded it and
  added it to PATH (https://sourceforge.net/projects/pkgconfiglite/files/
  )
• tried go get again and it worked

GetVersion() shows ImageMagick 6.9.3-7 Q16 x86_64 2016-04-05
http://www.imagemagick.org and using ImageMagick via CMD like this works
perfect: convert test.png test.jpg

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[simonflick]

ImageMagick canot load any images because of ERROR_MISSING_DELEGATE: NoDecodeDelegateForThisImageFormat 'JPEG'. But I'm not sure if this is caused by the way I installed it. I hope someone can contribute clear installation instructions for Windows.

[justinfx]

As far as I can tell, this wouldn't be related to the imagick bindings. It looks like your install of ImageMagick is missing plugin support for various image formats (jpg in this particular case).

[justinfx]

Actually I saw that you said convert tool works fine. Do you have multiple installs of ImageMagick? I dont know what might be required in a Windows environment to make Imagemagick find the location of the encoders/decoders

[simonflick]

I have only one installation. The first command downloads ImageMagick and at the same place you can find the binaries. The convert tool I used was in that folder. My test program also failed to load a PNG image. Here is the source code:

package main

import (
    "gopkg.in/gographics/imagick.v2/imagick"
)

func main() {
    imagick.Initialize()
    defer imagick.Terminate()

    wand := imagick.NewMagickWand()

    err := wand.ReadImage("test.jpg")
    if err != nil {
        panic(err)
    }
}

I don't know anything about building c-projects but maybe cgo is missing some flags that tell it to include all the other third-party libraries?

[justinfx]

Did you ever figure this out?

[vprus]

I could get Imagick to build, using the following procedure:

• Get MinGW and MSYS. I've used instructions from boost-bootstrap.patch is annoying StephanTLavavej/mingw-distro#2 (comment), though presumably getting gcc with pacman will also be fine

Alternative 1:

• Open a shell where gcc is available, msys shell is used below, but cmd.exe works too
• Run this:

$ export CGO_CFLAGS="-I/c/temp/gcc/msys64/mingw64/include/ImageMagick-6/ -D MAGICKCORE_QUANTUM_DEPTH=16 -D MAGICKCORE_HDRI_ENABLE=1 -Wno-deprecated"
$ export CGO_LDFLAGS="-L/c/temp/gcc/msys64/mingw64/lib -lMagickCore-6.Q16HDRI -lMagickWand-6.Q16HDRI"
$ go build -tags "dev no_pkgconfig" gopkg.in/gographics/imagick.v1/imagick

Alternative 2:

• Get pkg-config-lite from https://sourceforge.net/projects/pkgconfiglite/files
• Open a shell that has gcc in PATH
• Set PATH to include pkg-config-lite binaries
• Set PKG_CONFIG_PATH to /c/temp/gcc/msys64/mingw64/lib/pkgconfig
• Build with 'go build gopkg.in/gographics/imagick.v2/imagick'

Now, while both alternative appear to work, building code that uses imagick go package makes the go command eventually die with error 0xC0000135, so I must be doing something wrong.

[vprus]

When using gcc from msys, everything works fine, so the full procedure is:

• Install msys per instructions at: https://github.com/StephanTLavavej/mingw-distro/blob/master/README.md
• Install pkg-config-lite from https://sourceforge.net/projects/pkgconfiglite/files to any directory
• In msys shell, do pacman -S mingw-w64-x86_64-imagemagick
• In msys shell, do pacman -S mingw-w64-x86_64-gcc
• Switch to cmd.exe shell, and do:

set PATH=C:/Temp/gcc/msys64/mingw64/bin;%PATH%
set PKG_CONFIG_PATH=C:/Temp/gcc/msys64/mingw64/lib/pkgconfig
go build gopkg.in/gographics/imagick.v2/imagick

[justinfx]

Thanks for this info. I can add it to the main README

[itsnotvalid]

Just one problem, that MSYS2 is now giving version 7 of imagemagick, so this becomes completely broken.

Instead, one now needs to download v6 packages from msys2 repo manually, and then install it:

wget http://repo.msys2.org/mingw/x86_64/mingw-w64-x86_64-imagemagick-6.9.3.7-1-any.pkg.tar.xz
pacman -U mingw-w64-x86_64-imagemagick-6.9.3.7-1-any.pkg.tar.xz

[justinfx]

Well thats a shame. Would you be able to submit a PR with the corrected README for windows instructions?

[vprus]

That is unfortunate, the instructions worked for me a few days ago, but possibly I had older msys.