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The project settings only need to be altered. That's it. If I were you I would make a dll that is an empty project and add the source files.

SQL ConfigDataSource doesn't work at all. I always get unresolved externals. I know that I'm using the right lib and the right dll. The only way this works is if I dynamically load the dll and use...

This is not a real problem.

In ascii 48 - 57 = 0 - 9

so one easy thing to do is this.
You don't even need the static cast.

1: char t;
2: int k;
3: t = 5;