[SOLVED] Problem when using RSVG and Cairo in Python

Problem when using RSVG and Cairo in Python

I have been trying to put a SVG image in a tkinter frame with python 3.6 on Windows. I recently downloaded a the pycairo‑1.18.0‑cp36‑cp36m‑win32.whl file from https://www.lfd.uci.edu/~gohlke/pythonlibs/ and in the command prompt typed pip install pycairo‑1.18.0‑cp36‑cp36m‑win32.whl to install it. This is for pycairo, and it works fine.

I also need to install rsvg. Because it is unavailable for windows, I saved the following as rsvg.py in the same folder as my script:

#some code to give rsvg.render_cairo(ctx) ability
#on windows.
import os
try:
    import rsvg
    WINDOWS=False
except ImportError:
    print"Warning, could not import 'rsvg'"
    if os.name == 'nt':
        print "Detected windows, creating rsvg."
        #some workarounds for windows

        from ctypes import *

        l=CDLL('librsvg-2-2.dll')
        g=CDLL('libgobject-2.0-0.dll')
        g.g_type_init()

        class rsvgHandle():
            class RsvgDimensionData(Structure):
                _fields_ = [("width", c_int),
                            ("height", c_int),
                            ("em",c_double),
                            ("ex",c_double)]

            class PycairoContext(Structure):
                _fields_ = [("PyObject_HEAD", c_byte * object.__basicsize__),
                            ("ctx", c_void_p),
                            ("base", c_void_p)]

            def __init__(self, path):
                self.path = path
                error = ''
                self.handle = l.rsvg_handle_new_from_file(self.path,error)


            def get_dimension_data(self):
                svgDim = self.RsvgDimensionData()
                l.rsvg_handle_get_dimensions(self.handle,byref(svgDim))
                return (svgDim.width,svgDim.height)

            def render_cairo(self, ctx):
                ctx.save()
                z = self.PycairoContext.from_address(id(ctx))
                l.rsvg_handle_render_cairo(self.handle, z.ctx)
                ctx.restore()



        class rsvgClass():
            def Handle(self,file):
                return rsvgHandle(file)

This was my script:

from rsvg import *    
rC = rsvgClass()
h = rC.Handle("YOUR-FILE-HERE.svg")
s = cairo.ImageSurface(cairo.FORMAT_ARGB32, 100, 100)
ctx = cairo.Context(s)
h.render_cairo(ctx)

When I run it, I get the message:

Traceback (most recent call last): l=CDLL('librsvg-2-2.dll') File "C:\Users\Whoever\AppData\Local\Programs\Python\Python36-32\lib\ctypes\__init__.py", line 348, in __init__ self._handle = _dlopen(self._name, mode) OSError: [WinError 126] The specified module could not be found

Pretty much the librsvg-2-2.dll file is not there. Now what?

Any help would be greatly appreciated

Solution

This is pretty low spread on the internet and I'm posting this to help anyone else with the same question. After tons of searching I found this: https://github.com/jmcb/python-rsvg-dependencies/tree/master/bin. Simply copy all the .dll files into the same folder as the script and it should work.