WMultiTypeFix
When writing a file in a fixed length (Fixed) with various types (Header/Body/Footer, etc.), this is used.
Figure 1. WMultiTypeFix
The structure of WMultiTypeFix IO must be composed of a Master/SUB IO structure. During writing, it checks the SUB IO, and if it is not Null, it writes to the file.
Figure 2. WMultiTypeFix IO structure