Screendump (snippet from HotSweet.ahk)

VerNo = 0.912
tt := "Hotsweet " . VerNo . " - "
/*
**********
SCREENDUMP
**********
Whenever you hit the printscreen key, it will automatically save the picture in a folder of your choice using an automatic
naming scheme.

Unfortunately, this feature will not work without IrfanView installed because I cannot crack the internal clipboard format used by AutoHotKey.

IRFANVIEW CAN BE DOWNLOADED FROM HTTP://WWW.IRFANVIEW.COM/
*/
~PrintScreen::
Sleep 30
ImageToSave := ClipboardAll
Loop {
    IDNumber := ""
    Loop % DumpNumberWidth - StrLen(A_Index) {
        IDNumber .= "0"
    }
    IDNumber .= A_Index
    ShortFileName := DumpFilePrefix . IDNumber . DumpExtension
    FileName := A_WorkingDir . "\Screendumps\" . ShortFileName
} Until !FileExist(FileName)
Run, i_view32.exe /clippaste /convert=%FileName%, C:\Program Files (x86)\IrfanView\
If (!ErrorLevel)




    ToolTipDisplay(tt . "Screenshot successfully saved to " . ShortFileName,-1000)
Else
    ToolTipDisplay(tt . "Screenshot save failed. Please make sure IrfanView is properly installed in its default directory.",-4000)
Return

; Tooltip display function and removal subroutine.
ToolTipDisplay(Message, Delay) {
    ToolTip, %Message%
    SetTimer, RemoveToolTip, %Delay%
    Return
}

RemoveToolTip:
SetTimer, RemoveToolTip, Off
ToolTip
Return