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_GUICtrlRichEdit_SetZoom parameter limitation


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If you look at the help file for the above command, you'll see that it states that it only works for certain zoom values (100 and 200 to 6400).   I assume that this is due to an issue in an MSDN library that the command relies on.

After doing some investigating, I noticed that the GUIRichEdit.au3 library file contains the following code:

; #FUNCTION# ====================================================================================================================
; Authors........: Chris Haslam (c.haslam)
; Modified ......:
; ===============================================================================================================================
Func _GUICtrlRichEdit_SetZoom($hWnd, $iPercent)
    If Not _WinAPI_IsClassName($hWnd, $__g_sRTFClassName) Then Return SetError(101, 0, False)
    If Not __GCR_IsNumeric($iPercent, ">0") Then Return SetError(1021, 0, False)

    Local $iNumerator, $iDenominator
    Select
        Case Not ($iPercent = 100 Or ($iPercent >= 200 And $iPercent < 6400))
            Return SetError(1022, 0, False)
        Case $iPercent >= 100
            $iNumerator = 10000
            $iDenominator = 10000 / ($iPercent / 100)
        Case Else
            $iNumerator = 10000 * ($iPercent / 100)
            $iDenominator = 10000
    EndSelect
    Return _SendMessage($hWnd, $EM_SETZOOM, $iNumerator, $iDenominator) <> 0
EndFunc   ;==>_GUICtrlRichEdit_SetZoom

Which ensures that values are only within the bounds specified in the help file.    I found that if I comment out the portion of the code that limits the values, the function works fine for most (if not all) values.   I changed the code in the library file to this by simply commenting out the restricting lines of code:

; #FUNCTION# ====================================================================================================================
; Authors........: Chris Haslam (c.haslam)
; Modified ......:
; ===============================================================================================================================
Func _GUICtrlRichEdit_SetZoom($hWnd, $iPercent)
    If Not _WinAPI_IsClassName($hWnd, $__g_sRTFClassName) Then Return SetError(101, 0, False)
    If Not __GCR_IsNumeric($iPercent, ">0") Then Return SetError(1021, 0, False)

    Local $iNumerator, $iDenominator
    Select
;       Case Not ($iPercent = 100 Or ($iPercent >= 200 And $iPercent < 6400))
;           Return SetError(1022, 0, False)
        Case $iPercent >= 100
            $iNumerator = 10000
            $iDenominator = 10000 / ($iPercent / 100)
        Case Else
            $iNumerator = 10000 * ($iPercent / 100)
            $iDenominator = 10000
    EndSelect
    Return _SendMessage($hWnd, $EM_SETZOOM, $iNumerator, $iDenominator) <> 0
EndFunc   ;==>_GUICtrlRichEdit_SetZoom

 

I assume whatever windows bug existed at the time this was created, no longer exists so there is no need to restrict the values.   

Just wanted to point this out if anyone else is using this part of the library and required this functionality like I did.

 

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      History version:
    • By UEZ
      I saw this code here: http://zoomquilt.org/ and here: http://arkadia.xyz and thought how this can be implemented in AutoIt. Here the results.
       
      The Zoomquilt:
      ;coded by UEZ build 2018-01-10, idea and images taken from http://zoomquilt.org/ ;thanks to spudw2k for the MouseZoom function #pragma compile(Icon, "c:\Program Files (x86)\AutoIt3\Icons\au3.ico") #AutoIt3Wrapper_Run_Au3Stripper=y #Au3Stripper_Parameters=/so /pe /rm #AutoIt3Wrapper_Run_After=del /f /q "%scriptdir%\%scriptfile%_stripped.au3" #include <GDIPlus.au3> #include <GuiConstantsEx.au3> #include <WindowsConstants.au3> _GDIPlus_Startup() Global $hGUI, $iFPS = 0, $iShowFPS = 0, $bExit, $iW, $iH Global Const $sTitle = "GDI Image Zoom v2.1.2 coded by UEZ" AutoItSetOption("GUIOnEventMode", 1) Downloader() GDIPlus_ZoomImage() AutoItSetOption("GUIOnEventMode", 0) _GDIPlus_Shutdown() Func GDIPlus_ZoomImage($bMultimonitor = False) $bExit = False Local $i, $aImages[46], $hImage, $hObj ConsoleWrite("Loading images from local disk..." & @CRLF) Local $fTimer = TimerInit() For $i = 0 To UBound($aImages) - 1 $hImage = _GDIPlus_ImageLoadFromFile(@ScriptDir & "\Images\TheZoomquilt" & StringFormat("%02i.jpg", $i)) $aImages[$i] = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hImage) _GDIPlus_ImageDispose($hImage) Next ConsoleWrite(UBound($aImages) & " images loaded in " & TimerDiff($fTimer) & " ms" & @CRLF) Local $tDim = DllStructCreate($tagBITMAP) DllCall("GDI32.dll", 'int', 'GetObject', 'int', $aImages[0], 'int', DllStructGetSize($tDim), 'ptr', DllStructGetPtr($tDim)) $iW = $tDim.bmWidth $iH = $tDim.bmHeight Local $hFullScreen = WinGetHandle("[TITLE:Program Manager;CLASS:Progman]"), $aFullScreen[4], $iW_Dt, $iH_Dt $aFullScreen = WinGetPos($hFullScreen) If $bMultimonitor Then $iW_Dt = $aFullScreen[2] $iH_Dt = $aFullScreen[3] Else $iW_Dt = @DesktopWidth $iH_Dt = @DesktopHeight $aFullScreen[0] = "" $aFullScreen[1] = "" EndIf $hGUI = GUICreate($sTitle, $iW_Dt, $iH_Dt, $aFullScreen[0], $aFullScreen[1], $WS_POPUP, $WS_EX_TOPMOST) GUISetState(@SW_SHOW, $hGUI) GUISetCursor(16, 1) ;create canvas elements Local Const $hDC = _WinAPI_GetDC($hGUI) Local Const $hHBitmap = _WinAPI_CreateCompatibleBitmap($hDC, $iW_Dt, $iH_Dt) Local Const $hDC_backbuffer = _WinAPI_CreateCompatibleDC($hDC) Local Const $DC_obj = _WinAPI_SelectObject($hDC_backbuffer, $hHBitmap) Local Const $hMemDC = _WinAPI_CreateCompatibleDC($hDC) _WinAPI_SetStretchBltMode($hDC_backbuffer, $STRETCH_DELETESCANS) Local Const $hCanvas = _GDIPlus_GraphicsCreateFromHDC($hDC_backbuffer) _GDIPlus_GraphicsSetSmoothingMode($hCanvas, $GDIP_SMOOTHINGMODE_HIGHQUALITY) _GDIPlus_GraphicsSetPixelOffsetMode($hCanvas, $GDIP_PIXELOFFSETMODE_HIGHQUALITY) Local Const $hBrush_Clr = _GDIPlus_BrushCreateSolid(0xFF000000), _ $hBrush_FPS = _GDIPlus_BrushCreateSolid(0xFFFFFFFF), _ $hFormat_FPS = _GDIPlus_StringFormatCreate(), _ $hFamily_FPS = _GDIPlus_FontFamilyCreate("Arial"), _ $hFont_FPS = _GDIPlus_FontCreate($hFamily_FPS, 8), _ $tLayout_FPS = _GDIPlus_RectFCreate(0, 0, 130, 16) $iFPS = 0 GUISetOnEvent($GUI_EVENT_CLOSE, "_Exit_About") AdlibRegister("CalcFPS", 1000) Local $a[3], $b = 1, $c, $x, $e, $y, $w, $h, $w2 = $iW_Dt / 2, $h2 = $iH_Dt / 2, $q, $r If $iW_Dt > 1.5 * $iH_Dt Then $q = $iW_Dt $r = 0.75 * $iW_Dt Else $q = 1.5 * $iH_Dt $r = 0.75 * $iH_Dt EndIf Do For $e = 0 To 2 $a[$e] = $aImages[Mod(Floor($b) + $e, UBound($aImages))] Next $c = 2^(Mod($b, 1)) For $e = 0 To 2 $x = $w2 - $q / 2 * $c $y = $h2 - $r / 2 * $c $w = $q * $c $h = $r * $c $hObj = _WinAPI_SelectObject($hMemDC, $a[$e]) _WinAPI_StretchBlt($hDC_backbuffer, $x, $y, $w, $h, $hMemDC, 0, 0, $iW, $iH, $SRCCOPY) $c *= 0.5 Next $b += MouseZoom() IF $b < 0 Then $b = UBound($aImages) - $b _GDIPlus_GraphicsDrawStringEx($hCanvas, "FPS: " & $iShowFPS & " @ " & $iW_Dt & "x" & $iH_Dt & " px", $hFont_FPS, $tLayout_FPS, $hFormat_FPS, $hBrush_FPS) _WinAPI_BitBlt($hDC, 0, 0, $iW_Dt, $iH_Dt, $hDC_backbuffer, 0, 0, $SRCCOPY) $iFPS += 1 If $bExit Then ExitLoop Until Not Sleep(0) AdlibUnRegister("CalcFPS") ;release resources _GDIPlus_FontDispose($hFont_FPS) _GDIPlus_FontFamilyDispose($hFamily_FPS) _GDIPlus_StringFormatDispose($hFormat_FPS) _GDIPlus_BrushDispose($hBrush_Clr) _GDIPlus_BrushDispose($hBrush_FPS) _GDIPlus_GraphicsDispose($hCanvas) _WinAPI_SelectObject($hMemDC, $hObj) _WinAPI_DeleteDC($hMemDC) _WinAPI_SelectObject($hDC_backbuffer, $DC_obj) _WinAPI_DeleteDC($hDC_backbuffer) _WinAPI_DeleteObject($hHBitmap) _WinAPI_ReleaseDC($hGUI, $hDC) For $i = 0 To UBound($aImages) - 1 _WinAPI_DeleteObject($aImages[$i]) Next GUIDelete($hGUI) EndFunc ;==>GDIPlus_ZoomImage Func MouseZoom() ;https://www.arduino.cc/reference/en/language/functions/math/map/ Local $iInput = MouseGetPos(1), $iInMin = 0, $iInMax = @DesktopHeight, $iOutMin = 1, $iOutMax = -1, $iStep = 0.025 Return (($iInput - $iInMin) * ($iOutMax - $iOutMin) / ($iInMax - $iInMin) + $iOutMin) * $iStep EndFunc ;MouseZoom() Func _Exit_About() $bExit = True EndFunc ;==>_Exit_About Func CalcFPS() ;display FPS $iShowFPS = $iFPS $iFPS = 0 EndFunc ;==>CalcFPS Func Downloader() Local $i, $A = StringSplit("FUjD9hf gbHhxTR 8YyzJdR xP3aNkR 2Qi4fQr E6pW5Ky zmtWIBF Af7LtYp TuXy30d 3nKGLr2 hNoWscB mSBvv3K f4wJ70e mIt9XmM M4TkAyh P4L4qhd hNM6bTv VoT8JXM jqcGH0B DYVoN8n bOPQkOI NeaTfJ1 18ppMNr FZ3d8Jv HsoX2RP mjv4kzI 6rpJbef pySKauq WjNQYRV Ffooo8y Xei5XfD T5A415r LiV0VNB nGcwiO4 b1Gdjjy GE828iy eSQ7SLe 1mPyGgL GNtwJIr KxBlU7E aKXhms5 9Quu2wu Y07quDf r0yC5Qa 273fCkD 2wMyCUw FUjD9hf", " ", 2) Local $sURL For $i = 0 To UBound($A) - 1 If Not FileExists(@ScriptDir & "\Images\TheZoomquilt" & StringFormat("%02i.jpg", $i)) Then If Not FileExists(@ScriptDir & "\Images") Then DirCreate(@ScriptDir & "\Images") $sURL = "http://imgur.com/" & $A[Mod(20 + $i, 46)] & ".jpg" ConsoleWrite("Downloading " & $sURL & ": " & InetGet($sURL, @ScriptDir & "\Images\TheZoomquilt" & StringFormat("%02i.jpg", $i), 8) & " bytes" & @CRLF) ToolTip("Downloading images...Please wait! -> " & $i + 1 & " / " & UBound($A), MouseGetPos(0), MouseGetPos(1)) EndIf Next ToolTip("") EndFunc ;==>Downloader  
       
      Arkadia:
      ;coded by UEZ build 2018-01-10, idea and images taken from http://arkadia.xyz ;thanks to spudw2k for the MouseZoom function #pragma compile(Icon, "c:\Program Files (x86)\AutoIt3\Icons\au3.ico") #AutoIt3Wrapper_Run_Au3Stripper=y #Au3Stripper_Parameters=/so /pe /rm #AutoIt3Wrapper_Run_After=del /f /q "%scriptdir%\%scriptfile%_stripped.au3" #include <GDIPlus.au3> #include <GuiConstantsEx.au3> #include <WindowsConstants.au3> _GDIPlus_Startup() Global $hGUI, $iFPS = 0, $iShowFPS = 0, $bExit, $iW, $iH Global Const $sTitle = "GDI Image Zoom v2.2.1 coded by UEZ" AutoItSetOption("GUIOnEventMode", 1) Downloader() GDIPlus_ZoomImage() AutoItSetOption("GUIOnEventMode", 0) _GDIPlus_Shutdown() Func GDIPlus_ZoomImage($bMultimonitor = False) $bExit = False Local $i, $aImages[49], $hImage, $hObj ConsoleWrite("Loading images from local disk..." & @CRLF) Local $fTimer = TimerInit() For $i = 0 To UBound($aImages) - 1 $hImage = _GDIPlus_ImageLoadFromFile(@ScriptDir & "\Images\Arkadia" & $i & ".jpg") $aImages[$i] = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hImage) _GDIPlus_ImageDispose($hImage) Next ConsoleWrite(UBound($aImages) & " images loaded in " & TimerDiff($fTimer) & " ms" & @CRLF) Local $tDim = DllStructCreate($tagBITMAP) DllCall("GDI32.dll", "int", "GetObject", "int", $aImages[0], "int", DllStructGetSize($tDim), "ptr", DllStructGetPtr($tDim)) $iW = $tDim.bmWidth $iH = $tDim.bmHeight Local $hFullScreen = WinGetHandle("[TITLE:Program Manager;CLASS:Progman]"), $aFullScreen[4], $iW_Dt, $iH_Dt $aFullScreen = WinGetPos($hFullScreen) If $bMultimonitor Then $iW_Dt = $aFullScreen[2] $iH_Dt = $aFullScreen[3] Else $iW_Dt = @DesktopWidth $iH_Dt = @DesktopHeight $aFullScreen[0] = "" $aFullScreen[1] = "" EndIf $hGUI = GUICreate($sTitle, $iW_Dt, $iH_Dt, $aFullScreen[0], $aFullScreen[1], $WS_POPUP, $WS_EX_TOPMOST) GUISetState(@SW_SHOW, $hGUI) GUISetCursor(16, 1) ;create canvas elements Local Const $hDC = _WinAPI_GetDC($hGUI) Local Const $hHBitmap = _WinAPI_CreateCompatibleBitmap($hDC, $iW_Dt, $iH_Dt) Local Const $hDC_backbuffer = _WinAPI_CreateCompatibleDC($hDC) Local Const $DC_obj = _WinAPI_SelectObject($hDC_backbuffer, $hHBitmap) Local Const $hMemDC = _WinAPI_CreateCompatibleDC($hDC) _WinAPI_SetStretchBltMode($hDC_backbuffer, $STRETCH_DELETESCANS) Local Const $hCanvas = _GDIPlus_GraphicsCreateFromHDC($hDC_backbuffer) _GDIPlus_GraphicsSetSmoothingMode($hCanvas, $GDIP_SMOOTHINGMODE_HIGHQUALITY) _GDIPlus_GraphicsSetPixelOffsetMode($hCanvas, $GDIP_PIXELOFFSETMODE_HIGHQUALITY) Local Const $hBrush_Clr = _GDIPlus_BrushCreateSolid(0xFF000000), _ $hBrush_FPS = _GDIPlus_BrushCreateSolid(0xFFFFFFFF), _ $hFormat_FPS = _GDIPlus_StringFormatCreate(), _ $hFamily_FPS = _GDIPlus_FontFamilyCreate("Arial"), _ $hFont_FPS = _GDIPlus_FontCreate($hFamily_FPS, 8), _ $tLayout_FPS = _GDIPlus_RectFCreate(0, 0, 130, 16) $iFPS = 0 GUISetOnEvent($GUI_EVENT_CLOSE, "_Exit_About") AdlibRegister("CalcFPS", 1000) Local $a[3], $b = 1, $c, $x, $e, $y, $w, $h, $w2 = $iW_Dt / 2, $h2 = $iH_Dt / 2, $q, $r If $iW_Dt > 1.5 * $iH_Dt Then $q = $iW_Dt $r = 0.75 * $iW_Dt Else $q = 1.5 * $iH_Dt $r = 0.75 * $iH_Dt EndIf Do For $e = 0 To 2 $a[$e] = $aImages[Mod(Floor($b) + $e, UBound($aImages))] Next $c = 2^(Mod($b, 1)) For $e = 0 To 2 $x = $w2 - $q / 2 * $c $y = $h2 - $r / 2 * $c $w = $q * $c $h = $r * $c $hObj = _WinAPI_SelectObject($hMemDC, $a[$e]) _WinAPI_StretchBlt($hDC_backbuffer, $x, $y, $w, $h, $hMemDC, 0, 0, $iW, $iH, $SRCCOPY) $c *= 0.5 Next $b += MouseZoom() IF $b < 0 Then $b = UBound($aImages) - $b _GDIPlus_GraphicsDrawStringEx($hCanvas, "FPS: " & $iShowFPS & " @ " & $iW_Dt & "x" & $iH_Dt & " px", $hFont_FPS, $tLayout_FPS, $hFormat_FPS, $hBrush_FPS) _WinAPI_BitBlt($hDC, 0, 0, $iW_Dt, $iH_Dt, $hDC_backbuffer, 0, 0, $SRCCOPY) $iFPS += 1 If $bExit Then ExitLoop Until Not Sleep(0) AdlibUnRegister("CalcFPS") ;release resources _GDIPlus_FontDispose($hFont_FPS) _GDIPlus_FontFamilyDispose($hFamily_FPS) _GDIPlus_StringFormatDispose($hFormat_FPS) _GDIPlus_BrushDispose($hBrush_Clr) _GDIPlus_BrushDispose($hBrush_FPS) _GDIPlus_GraphicsDispose($hCanvas) _WinAPI_SelectObject($hMemDC, $hObj) _WinAPI_DeleteDC($hMemDC) _WinAPI_SelectObject($hDC_backbuffer, $DC_obj) _WinAPI_DeleteDC($hDC_backbuffer) _WinAPI_DeleteObject($hHBitmap) _WinAPI_ReleaseDC($hGUI, $hDC) For $i = 0 To UBound($aImages) - 1 _WinAPI_DeleteObject($aImages[$i]) Next GUIDelete($hGUI) EndFunc ;==>GDIPlus_ZoomImage Func MouseZoom() ;https://www.arduino.cc/reference/en/language/functions/math/map/ Local $iInput = MouseGetPos(1), $iInMin = 0, $iInMax = @DesktopHeight, $iOutMin = 1, $iOutMax = -1, $iStep = 0.025 Return (($iInput - $iInMin) * ($iOutMax - $iOutMin) / ($iInMax - $iInMin) + $iOutMin) * $iStep EndFunc ;MouseZoom() Func _Exit_About() $bExit = True EndFunc ;==>_Exit_About Func CalcFPS() ;display FPS $iShowFPS = $iFPS $iFPS = 0 EndFunc ;==>CalcFPS Func Downloader() Local $sURL, $i For $i = 0 To 48 If Not FileExists(@ScriptDir & "\Images\Arkadia" & $i & ".jpg") Then If Not FileExists(@ScriptDir & "\Images") Then DirCreate(@ScriptDir & "\Images") $sURL = "http://arkadia.xyz/images/arkadia" & $i & ".jpg" ConsoleWrite("Downloading " & $sURL & ": " & InetGet($sURL, @ScriptDir & "\Images\Arkadia" & $i & ".jpg", 8) & " bytes" & @CRLF) ToolTip("Downloading images...Please wait! -> " & $i + 1 & " / " & $i, MouseGetPos(0), MouseGetPos(1)) EndIf Next ToolTip("") EndFunc ;==>Downloader  
      The missing images will be download and saved to script dir in folder images. Due to internal integer format of the GDI functions the screen is little bit wobbling.
       
      Happy watching. 
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