AutoHotkey Community

FileSelectFile, Path
VarSetCapacity(md5sum, 32)
DllCall("MD5Lib.dll\hexMD5", "str", md5sum, "str", Path)
FileAppend, %md5sum%`t%Path%`r`n, H:\Programmieren\Textdokument.txt.MD5.txt

FileSelectFolder, Path
hModule := DllCall("LoadLibrary", "str", "MD5Lib.dll")  ; Avoids the need for DllCall() in the loop to load the library.
Loop, %Path%\*.*, , 1
{
   DllCall("MD5Lib.dll\hexMD5", "str", md5sum, "str", A_LoopFileFullPath)
   FileAppend, %md5sum%`t%A_LoopFileFullPath%`r`n, %Path%\MD5Sums.txt
}
DllCall("FreeLibrary", "UInt", hModule)  ; It is best to unload the DLL after using it (or before the script exits).

PATH=C:\Folder\File.ext
VarSetCapacity(md5sum, 32)
DllCall("MD5Lib.dll\hexMD5", "str", md5sum, "str", "%PATH%")
MsgBox %md5sum%

;; ---------------------------------------------------------------------
;; -----------    A little gui using teddy's md5lib.dll    -------------
;; ---------------------------------------------------------------------

Gui, Add, Progress, x16 y40 w310 h10 c00aa00 -smooth vDoingIt,0
Gui, Add, Text, x16 y10 w210 h20,Teddy's MD5 Checksum calculator. 
Gui, Add, Button, x236 y10 w90 h20 gDoit,Load Files.
Gui, Add, Text, x16 y60 w310 h40 +Center vMessage, 
Gui, Show, x272 y114 h102 w343, Generated with SmartGUI Creator
Return

GuiClose:
ExitApp

Doit:
maxsize =0.0
currsize = 0.0
f_count = 0
st := a_tickcount
FileSelectFolder, Path
guicontrol,,message,Loading ..... ;; just in case there's lots
Loop, %Path%\*.*, , 1
{
MaxSize :=  MaxSize + A_LoopFileSize
F_count++
}
hModule := DllCall("LoadLibrary", "str", "MD5Lib.dll")
Loop, %Path%\*.*, , 1
{
CurrSize :=  CurrSize + A_LoopFileSize
   DllCall("MD5Lib\hexMD5", str, md5sum, str, A_LoopFileFullPath)
   FileAppend, %md5sum%`t%A_LoopFileFullPath%`n, %A_Desktop%\MD5Sums.txt
done := currsize/maxsize * 100
show := round(done)
guicontrol,,doingit,%show%
guicontrol,,Message,%show% `%
}
DllCall("FreeLibrary", "UInt", hModule)
en := (a_tickcount - st)/1000
guicontrol,,message,Finished Processing %f_count% Files ...`nIn %en% Seconds !
return