I'm writing an application that encrypts its data. It can then display it unencrypted using the app's UI after a user enters password. My goal is to minimize exposure of plaintext data while in RAM. For that I want to prevent swapping it to disk as much as possible.
I know that I can adjust my process's working set (by calling SetProcessWorkingSetSize API) and then lock those sensitive pages in RAM (by calling VirtualLock.) That, in theory, should minimize the chances of it being written to disk.
The question I have is, can I do the same with the memory that is used by the common controls in my dialog window, namely in Edit boxes, combo boxes, and most importantly RichEdit control?
PS. I'm assuming that they all use data from the heap for my process. Correct?
EDIT: Seeing all the comments below I need to clarify. By saying "lock", I don't mean, "lock it with a padlock and key so that no one can see it." I meant, lock it as with the VirtualLock
API.