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jorgen / json_struct

json_struct is a single header only C++ library for parsing JSON directly to C++ structs and vice versa
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How to Install this? #2

Closed Bobisback closed 5 years ago

Bobisback commented 5 years ago

Hello, I am trying to use this in a C++ dll project I have. I am just not sure how to install this?

seems like I just copy the json_tools.h into my project, but this is causing the following error on line 4088: C2589 '(': illegal token on right side of '::'

Which makes no since considering the code does not have that at all. What am I missing?

Thanks, Bob

jorgen commented 5 years ago

Hey, Yes the idea is that you just copy the header to a suitable place and include it in the source.

I would love to help you out, but I need a bit more since I’m not certain what the problem is. Are you using visual studio 2013 or above? Could you send me a small example of your code?

Bobisback commented 5 years ago

I am using Visual Studio 2017, latest version with a brand new C++ dll project. I do not have any sample code right this second. If I get some time tomorrow I may be able to do a sample project.

I really wanted to use this but could not figure it out so just parsing the stuff manually right now.

jorgen commented 5 years ago

This is odd. Travis CI run the auto test for every build and they are succeeding right now. I will try and figure out what’s going wrong if you give a sample project. Could we start with the full error log?

Bobisback commented 5 years ago

What it actually sounds like to me is a hidden character bug. It used to happen to me all the time in C especially when switching between platforms (aka mac to windows). Basically there is some special ASCII char hidden in the file somewhere, on some computers it just ignores it and on others it does not.

What is interesting is if I comment out the line that it errors on many other errors show up. What is also interesting is visual studio does not show an error unless I compile it. This again suggests the above, meaning the compiler sinces this char but visual studio does not. Also intellisence works fine and also shows no issues.

With this in mind I tried copying the file directly from the zip and also copying the raw text from github into a new file. Both with the same result. The error above is the full log when I compile in Visual Studio. Not sure if there is a way to get a more verbose output or not.

Bobisback commented 5 years ago

json_tools_error

Here is a screen capture of the issue. So steps to reproduce for me are add the header file to the project. Import it and use it. Then build the project. Here is my visual studio info.

What is crazy is the chars are perfectly correct hahaa and what it says is just not right. That is why I just assumed I installed it incorrectly. In fact I am not really sure I still have it installed correctly. i am very new to c++ so.


Version 15.9.11
VisualStudio.15.Release/15.9.11+28307.586
Microsoft .NET Framework
Version 4.7.03056

Installed Version: Community

Visual C++ 2017   00369-60000-00001-AA171
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Azure Stream Analytics Tools for Visual Studio   2.3.3000.2
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Microsoft Azure Tools   2.9
Microsoft Azure Tools for Microsoft Visual Studio 2017 - v2.9.0.0

Microsoft Continuous Delivery Tools for Visual Studio   0.4
Simplifying the configuration of Azure DevOps pipelines from within the Visual Studio IDE.

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Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft Library Manager   1.0
Install client-side libraries easily to any web project

Microsoft MI-Based Debugger   1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards   1.0
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Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container.

Microsoft Visual Studio VC Package   1.0
Microsoft Visual Studio VC Package

MLGen Package Extension   1.0
MLGen Package Visual Studio Extension Detailed Info

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Support for debugging Mono processes with Visual Studio.

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Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer   4.16.30 (e0af99a34)
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Xamarin.iOS and Xamarin.Mac SDK   12.4.0.64 (9c8d8e0)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.```
jorgen commented 5 years ago

Ah! I know what this is :( it’s the min max thing in windows.h :( I only undef min in json_tools.h.

On the line above where you include json_tools.h do: #undef max. This is a workaround obviously:) hope it works🤞

jorgen commented 5 years ago

Please let me know if it solves it for you. I will fix it tomorrow if this is the case.

Bobisback commented 5 years ago

Ya that seemed to fix it. It is compiling now.

Thanks!

jorgen commented 5 years ago

Ok, I have added a #error directive to json_tools.h making the build fail with a sensible compiler error if either max or min macros are defined (ie. #define NOMINMAX 1 on windows before including Windows.h). I have also added a note to the Readme.md about json_tool.h being the only header needed and that it should be copied into the projects include path.

Bobisback commented 5 years ago

Fantastic thanks a ton for the help!!

Bobisback commented 5 years ago

Ok so with the new version now I really do not understand how to install it. hahaa Now I am getting errors, so I need to remove the error line you put in and add the include. But now the min functions on line 1512, 1513, and 1798 are erroring with "expecting identifier" errors.

jorgen commented 5 years ago

But are you not getting an error message saying you should define the NOMINMAX define. Just place that define as a compiler option and it should work. Alternatively you can undef min and max before including json_tools.h? The reason I solved it that way is bacause I think it is a bit evil to undefine macros inside and the header, so instead I’m telling the user to do it correctly before including windows.h

Hope you get it to work!