Detect if Microsoft Visual C++ runtime 2015 is not installed on windows

[charlesw]

As this distribution of Tesseract is compiled by Microsoft Visual Studio 2015 the Microsoft Visual C++ runtime for the appropriate architecture (x86 or x64) is required. Unfortunately if this is missing from the target system tesseract will fail to load with an error just stating it failed to load "liblept168.dll". Ideally we would first detect if VS 2015 is installed and if not throw a meaningful error stating the problem and what can be done to fix it.

[szalapski]

What DLL is needed for that? I had assumed it was msvcrt110.dll, but I don't even find that on my system.

[charlesw]

According to https://stackoverflow.com/questions/12206314/detect-if-visual-c-redistributable-for-visual-studio-2012-is-installed the file is located here: %windir%\system32\msvcr110.dll.

[charlesw]

Updated as the wrapper now depends on VS 2015.

[wesleycouto]

If possible, update README regarding users to install Microsoft Visual C++ runtime 2015 instead of 2013!

Thank you!

[charlesw]

Thanks and fixed.