Third: VS2012, call the OpenCV library, in the program defined variables, compile no problem, the runtime will error "variable use undefined" _vs2012

I initialize the initialization of the function, but can start to run, but after a while will be an error, the use of variables are not defined, error screenshot

Finally, the program uses the variable when it calls the function, I use this variable to save a number, the next call will be used, so it will error, because the function inside the variable after the function call to release the variable, the number of storage does not exist, the next time, the number of storage does not exist. So it will report this mistake, cause we actually defined, the error is not defined. The correct approach is to define the variable as a global variable, and the problem is solved.