System.AnsiStringBase.vprintf
API:System.AnsiStringBase.vprintf
Description
Sets the value of AnsiStringBase, given a format string and its arguments.
Use vprintf to set the value of AnsiStringBase, given a standard C++ format specifier. Pass the values to any arguments in the format specifier as a variable argument list that was created using va_start.
This method returns the length of the final, formatted string.