diff --git a/README.md b/README.md
index 61ffef4..6a24799 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 matplotlib-cpp
 ==============
 
+[![Build status](https://ci.appveyor.com/api/projects/status/qcv0r9y4jf5bvxa8?svg=true)](https://ci.appveyor.com/project/Chachay/matplotlib-cpp)
+
 Welcome to matplotlib-cpp, possibly the simplest C++ plotting library.
 It is built to resemble the plotting API used by Matlab and matplotlib.
 
diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 0000000..8578305
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,31 @@
+version: 1.0.{build}
+branches:
+  only:
+  - dev3
+image:
+- Visual Studio 2015
+- Visual Studio 2017
+- Visual Studio 2019
+configuration: Release
+platform: x64
+init:
+- cmd: >-
+    echo %APPVEYOR_BUILD_WORKER_IMAGE%
+
+    if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" set MSVC_VERSION=14
+
+    if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2017" set MSVC_VERSION=15
+
+    if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2019" set MSVC_VERSION=19
+
+    set PATH=%PYTHONHOME%;%PYTHONHOME%\Scripts;%ProgramFiles(x86)%\Microsoft Visual Studio\Installer;%PATH%
+environment:
+  PYTHONHOME: C:\Miniconda37-x64
+install:
+- cmd: >-
+    conda install --yes numpy matplotlib
+build_script:
+- cmd: >-
+    cd contrib
+
+    call WinBuild.cmd
\ No newline at end of file
diff --git a/contrib/CMakeLists.txt b/contrib/CMakeLists.txt
index edb40b1..b402d9b 100644
--- a/contrib/CMakeLists.txt
+++ b/contrib/CMakeLists.txt
@@ -9,6 +9,7 @@ include_directories(${PYTHONHOME}/Lib/site-packages/numpy/core/include)
 link_directories(${PYTHONHOME}/libs)
 
 add_definitions(-DMATPLOTLIBCPP_PYTHON_HEADER=Python.h)
+add_compile_definitions(WITHOUT_NUMPY)
 
 # message(STATUS "*** dump start cmake variables ***")
 # get_cmake_property(_variableNames VARIABLES)
diff --git a/contrib/README.md b/contrib/README.md
index 0af8515..19dffd2 100644
--- a/contrib/README.md
+++ b/contrib/README.md
@@ -30,3 +30,8 @@ The `WinBuild.cmd` will set up temporal ENV variables and build binaries in (mat
 
 3. Find exe files in examples/build/Release
 Note: platforms folder is necessary to make qt works.
+
+
+### Check before run examples
+If you use Anaconda on Windows, you might need to set PYTHONHOME to Anaconda home directory and QT_QPA_PLATFORM_PLUGIN_PATH to %PYTHONHOME%Library/plugins/platforms. The latter is for especially when you get the error which says 'This application failed to start because it could not find or load the Qt platform plugin "windows"
+in "".'
diff --git a/contrib/WinBuild.cmd b/contrib/WinBuild.cmd
index 9dfd627..f70c736 100644
--- a/contrib/WinBuild.cmd
+++ b/contrib/WinBuild.cmd
@@ -2,9 +2,9 @@
 @setlocal EnableDelayedExpansion
 
 REM ------Set Your Environment------------------------------- 
-if NOT DEFINED MSVC_VERSION set MSVC_VERSION=15
+if NOT DEFINED MSVC_VERSION set MSVC_VERSION=19
 if NOT DEFINED CMAKE_CONFIG set CMAKE_CONFIG=Release
-if NOT DEFINED PYTHONHOME   set PYTHONHOME=C:/Users/%username%/Anaconda3
+if NOT DEFINED PYTHONHOME   set PYTHONHOME=C:/Users/%username%/miniconda3
 REM ---------------------------------------------------------
 
 set KEY_NAME="HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\VisualStudio\SxS\VS7"
@@ -28,9 +28,13 @@ if "%MSVC_VERSION%"=="14" (
     ) else (
         set CMAKE_GENERATOR=Visual Studio 15 2017
     )
+) else if "%MSVC_VERSION%"=="19" (
+    set CMAKE_GENERATOR=Visual Studio 16 2019
 )
-if "%MSVC_VERSION%"=="15" (
-    for /F "usebackq tokens=1,2,*" %%A in (`REG QUERY %KEY_NAME% /v %VALUE_NAME%`) do (
+
+if "%MSVC_VERSION%" GEQ "15" (
+    REM Find VC · microsoft/vswhere Wiki https://github.com/microsoft/vswhere/wiki/Find-VC
+    for /F "usebackq tokens=1,2,*" %%A in (`vswhere -latest -products * -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath`) do (
         set batch_file=%%CVC\Auxiliary\Build\vcvarsall.bat
     )
 ) else (
@@ -43,16 +47,27 @@ pushd examples
 if NOT EXIST build mkdir build
 pushd build
 
-cmake -G"!CMAKE_GENERATOR!" ^
-      -DPYTHONHOME:STRING=%PYTHONHOME%^
-      -DCMAKE_BUILD_TYPE:STRING=%CMAKE_CONFIG% ^
-      %~dp0
+if "%MSVC_VERSION%" GEQ "19" (
+    cmake -G"!CMAKE_GENERATOR!" -A x64^
+        -DPYTHONHOME:STRING=%PYTHONHOME%^
+        -DCMAKE_BUILD_TYPE:STRING=%CMAKE_CONFIG% ^
+        %~dp0
+) else (
+    cmake -G"!CMAKE_GENERATOR!" ^
+        -DPYTHONHOME:STRING=%PYTHONHOME%^
+        -DCMAKE_BUILD_TYPE:STRING=%CMAKE_CONFIG% ^
+        %~dp0
+)
 cmake --build . --config %CMAKE_CONFIG%  
+SET BUILD_ERRORLEVEL=!ERRORLEVEL!
+IF NOT "!BUILD_ERRORLEVEL!"=="0" (
+    EXIT /B !BUILD_ERRORLEVEL!
+)
 
 pushd %CMAKE_CONFIG%  
 if not EXIST platforms mkdir platforms
-if EXIST %PYTHONHOME%/Library/plugins/platforms/qwindows.dll ^
-cp %PYTHONHOME%/Library/plugins/platforms/qwindows.dll ./platforms/
+if EXIST %PYTHONHOME%\Library\plugins\platforms\qwindows.dll ^
+copy %PYTHONHOME%\Library\plugins\platforms\qwindows.dll .\platforms\
 popd
 REM move ./%CMAKE_CONFIG% ../
 popd
diff --git a/matplotlibcpp.h b/matplotlibcpp.h
index 6770074..3774e40 100644
--- a/matplotlibcpp.h
+++ b/matplotlibcpp.h
@@ -13,6 +13,7 @@
 #include <iostream>
 #include <cstdint> // <cstdint> requires c++11 support
 #include <functional>
+#include <string>
 
 #ifndef WITHOUT_NUMPY
 #  define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION
@@ -312,9 +313,9 @@ template <> struct select_npy_type<uint64_t> { const static NPY_TYPES type = NPY
 
 // Sanity checks; comment them out or change the numpy type below if you're compiling on
 // a platform where they don't apply
-static_assert(sizeof(long long) == 8);
+static_assert(sizeof(long long) == 8, "long long must be 8 byte");
 template <> struct select_npy_type<long long> { const static NPY_TYPES type = NPY_INT64; };
-static_assert(sizeof(unsigned long long) == 8);
+static_assert(sizeof(unsigned long long) == 8, "unsigned long long must be 8 byte");
 template <> struct select_npy_type<unsigned long long> { const static NPY_TYPES type = NPY_UINT64; };
 // TODO: add int, long, etc.