Steve’s Bunker

It took me a few minutes to figure this one out, a simple MessageBox won’t do as that’s a blocking call. Then I stumbled upon this old msdn blog article:
http://blogs.msdn.com/oldnewthing/archive/2006/09/25/770536.aspx.

Basically I had a requirement for a certain project to display some sort of progress message to the end user while performing complicated logic that could take 10seconds to a couple minutes and this had to be done from within a replacement GINA for WinXP. The above article was of extreme help in understanding the way message passing works in Win32.

DialogBox (with reference to the callback function)

• callback function.
• show message window do all my work here.
• then call EndDialog to return to the previous function.