将我的 c++ 项目升级到 VS19 后看到许多编译错误

Question

I had built a c++ dektop project with VS17. Now due to certain requirements, I needed it to migrate to VS19.

After making changes to compile my project with VS19, I am seeing many errors like below:

1. C3646 'OVERRIDE': unknown override specifier
2. C2039: 'wstring': is not a member of 'std'

I found this link - https://learn.microsoft.com/en-us/cpp/error-messages/compiler-errors-2/compiler-error-c3646?view=msvc-170
but could not find it useful to fix my issue.

I am looking for an easy fix, like if there is a way to use VS17 c++ compiler in VS19.

Answer 1

Rather than going back to the old compiler, you might be better off tackling the errors one-by-one:

OVERRIDE : is probably defined as macro somewhere in your project. Find out, what value OVERRIDE is being resolved to. Put the cursor into the word OVERRIDE to get the value. It could be that the respective include file is not properly included for some reason. Does your old project include a forced include for global definitions?

wstring : to be recognized as std::wstring, you have to include <string> .
Check your UNICODE settings. They determine the usage of 8-byte vs. multi-byte characters for strings. Look at Configuration Properties / Advanced / Character Set in the solution properties.