kor Posted July 9, 2012 Share Posted July 9, 2012 somewhat strange. I have some labels that I am using in a GUI that will report a value. I have a button that essentially "clears" all the values and resets the gui back to blank. I am using GUiCtrlDelete($handle) However if the user presses the "clear" button before they run the program then $handle doesn't exist yet. Is there a way to somehow check if a gui label exists? Link to comment Share on other sites More sharing options...
water Posted July 9, 2012 Share Posted July 9, 2012 You could use function IsDeclared to check if the variable has been declared. My UDFs and Tutorials: Spoiler UDFs:Active Directory (NEW 2022-02-19 - Version 1.6.1.0) - Download - General Help & Support - Example Scripts - WikiExcelChart (2017-07-21 - Version 0.4.0.1) - Download - General Help & Support - Example ScriptsOutlookEX (2021-11-16 - Version 1.7.0.0) - Download - General Help & Support - Example Scripts - WikiOutlookEX_GUI (2021-04-13 - Version 1.4.0.0) - DownloadOutlook Tools (2019-07-22 - Version 0.6.0.0) - Download - General Help & Support - WikiPowerPoint (2021-08-31 - Version 1.5.0.0) - Download - General Help & Support - Example Scripts - WikiTask Scheduler (NEW 2022-07-28 - Version 1.6.0.1) - Download - General Help & Support - Wiki Standard UDFs:Excel - Example Scripts - WikiWord - Wiki Tutorials:ADO - WikiWebDriver - Wiki Link to comment Share on other sites More sharing options...
kor Posted July 9, 2012 Author Share Posted July 9, 2012 I have found I can do this.. but not sure if it's the correct way I declare the handle as a global variable at the top Global $handle $handle = GuiCtrlCreateLabel("test") If $handle Then GuiCtrlDelete($handle) Link to comment Share on other sites More sharing options...
Moderators Melba23 Posted July 9, 2012 Moderators Share Posted July 9, 2012 kor,If the ControlID (not handle) of your label is undefined or unused then using GUICtrlDelete on it does not crash AutoIt: #include <GUIConstantsEx.au3> Global $cLabel $hGUI = GUICreate("Test", 500, 500) GUISetState() Sleep(1000) MsgBox(0, "Ready?", "Deleting label") GUICtrlDelete($cLabel) While 1 Switch GUIGetMsg() Case $GUI_EVENT_CLOSE Exit EndSwitch WEndBut you must reset the variable to 0 if you delete it or the value remains valid and you might get errors like this: #include <GUIConstantsEx.au3> ; Declare a variable Global $cLabel $hGUI = GUICreate("Test", 500, 500) ; Create a label and assing the ControlID to the variable $cLabel = GUICtrlCreateLabel("Label", 10, 10, 200, 20) GUISetState() Sleep(1000) MsgBox(0, "Ready?", "Deleting label") GUICtrlDelete($cLabel) MsgBox(0, "And now:", "Create a new label") ; Note that we do not assign this ControlID to $cLabel GUICtrlCreateLabel("New label", 10, 100, 200, 20) MsgBox(0, "Oops", "Look what happens now!") GUICtrlDelete($cLabel) ; But that the ControlID is reused and so the new label is deleted While 1 Switch GUIGetMsg() Case $GUI_EVENT_CLOSE Exit EndSwitch WEndIf you add a $cLabel = 0 line after the first GUICtrlDelete($cLabel) then all will happen as you think it should: #include <GUIConstantsEx.au3> ; Declare a variable Global $cLabel $hGUI = GUICreate("Test", 500, 500) ; Create a label and assing the ControlID to the variable $cLabel = GUICtrlCreateLabel("Label", 10, 10, 200, 20) GUISetState() Sleep(1000) MsgBox(0, "Ready?", "Deleting label") GUICtrlDelete($cLabel) $cLabel = 0 ; Reset the variable to a non-existent control <<<<<<<<<<<<<<<<<<<<<<<<<<< MsgBox(0, "And now:", "Create a new label") ; Note that we do not assign this ControlID to $cLabel GUICtrlCreateLabel("New label", 10, 100, 200, 20) MsgBox(0, "Oops", "Look what happens now!") GUICtrlDelete($cLabel) ; But that the ControlID is reused and so the new label is deleted While 1 Switch GUIGetMsg() Case $GUI_EVENT_CLOSE Exit EndSwitch WEndAll clear? Please ask if not. M23 Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind Open spoiler to see my UDFs: Spoiler ArrayMultiColSort ---- Sort arrays on multiple columnsChooseFileFolder ---- Single and multiple selections from specified path treeview listingDate_Time_Convert -- Easily convert date/time formats, including the language usedExtMsgBox --------- A highly customisable replacement for MsgBoxGUIExtender -------- Extend and retract multiple sections within a GUIGUIFrame ---------- Subdivide GUIs into many adjustable framesGUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView itemsGUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeViewMarquee ----------- Scrolling tickertape GUIsNoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxesNotify ------------- Small notifications on the edge of the displayScrollbars ----------Automatically sized scrollbars with a single commandStringSize ---------- Automatically size controls to fit textToast -------------- Small GUIs which pop out of the notification area Link to comment Share on other sites More sharing options...
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