I was receiving link error LNK1120 in Visual Studio after adding some C code to my C++ project, and the problem was, as I discovered here (and found more info on here), that I hadn’t declared my C code as “extern C”.
So basically I added #ifdef __cplusplus macros to check if it was C or C++ code and if C++ then outputting “extern C {” with a suitable “}” at the end of the file.
I was forced to lookup Visual Studio’s Compiler Error C2662 because I was getting it in my code. Turns out this happens when your const’s don’t line up. In my case I had const in the client declaration but the member function I was calling didn’t have the const specification.
This little nugget of code from the referenced article shows how to fix up the problem:
// C2662.cpp
class C {
public:
void func1();
void func2() const{}
} const c;
int main() {
c.func1(); // C2662
c.func2(); // OK
}
Recently after my hosting provider hard-booted one of my machines the MySQL service started to complain “Failed To Read Auto-Increment Value From Storage Engine” when an insert was issued to any table with an auto increment field. I found the solution here, and it basically requires you to reset the auto increment key on the table, like this:
ALTER TABLE `table_name` AUTO_INCREMENT =1
I had to do that on all of my tables that had auto increment keys to resolve the issue.