Sign in to follow this  
Followers 0
JonathanR

DllOpen...DllClose

3 posts in this topic

Just wondering if there is any reason to open and close a dll manually, compared to letting DllCall open/close it for you.

I assume that if you were to make a bunch of dll calls, you'd want to manually open/close so you'd only have to open it once rather than for every call, but is it worth doing?

How do you open/close your dlls?

Share this post


Link to post
Share on other sites



JRouleau,

If I am going to call a DLL repeatedly (using _IsPressed in a loop is a good example) then I will always open and close the DLL. Why waste CPU cycles opening and closing the DLL each time? From the Help file for _IsPressed:

If calling this function repeatedly, should open 'user32.dll' and pass in handle

The same is true for file opening/closing. The Help file for FileWriteLine is equally specific:

If a filename is given rather than a file handle, the file will be opened and closed during the function call. For parsing large text files this will be much slower than using filehandles

M23


Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

Share this post


Link to post
Share on other sites

#3 ·  Posted (edited)

When using dlls that establish a connection which should be persistent throgh multiple DLLCalls, you have to use DLLopen or you would not be able to proceed. Examples are: WinHTTP, MySQL(libmysql), FTP, BASS.dll, ...

The DLLClose is not that important, since you can just leave the DLL opened until termination, then it will be freed automatically.

Edited by ProgAndy

*GERMAN* [note: you are not allowed to remove author / modified info from my UDFs]My UDFs:[_SetImageBinaryToCtrl] [_TaskDialog] [AutoItObject] [Animated GIF (GDI+)] [ClipPut for Image] [FreeImage] [GDI32 UDFs] [GDIPlus Progressbar] [Hotkey-Selector] [Multiline Inputbox] [MySQL without ODBC] [RichEdit UDFs] [SpeechAPI Example] [WinHTTP]UDFs included in AutoIt: FTP_Ex (as FTPEx), _WinAPI_SetLayeredWindowAttributes

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0