滚动条 最大滚动位置 这个参数具体是什么意思，跟屏幕坐标如何转换？
本帖最后由 fenhanxue 于 2017-3-1 01:08 编辑_GUIScrollBars_SetScrollInfoMax
设置最大滚动位置
#Include <GuiScrollBars.au3>
_GUIScrollBars_SetScrollInfoMax($hWnd, $fnBar, $nMax)
$hWnd 窗口句柄
$fnBar 指定滚动控件的类型. 参数可以是以下值之一:
$SB_CTL - 设置滚动控件参数. $hWnd 必须是滚动控件的窗口句柄
$SB_HORZ - 设置窗口的标准水平滚动控件的参数.
$SB_VERT - 设置窗口标准垂直滚动控件的参数.
$nMax 最大滚动位置
其中，第三个参数，$nMax 最大滚动位置 具体是什么意思，跟控件的坐标（位置？）好像不是1:1对应的关系，两者之间应该如何进行数字转换？
#Include <GuiScrollBars.au3>
#include <ScrollBarConstants.au3>
#Include <Excel.au3>
#include <ButtonConstants.au3>
#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>
#include <WindowsConstants.au3>
HotKeySet('q','quit')
HotKeySet('t','_test')
GUIRegisterMsg($WM_VSCROLL, "WM_VSCROLL")
$Form1 = GUICreate("测试", 300, 300)
GUISetState(@SW_SHOW)
$Form2 = GUICreate('',200,200,50,50, $WS_CHILD, $WS_EX_CLIENTEDGE, $Form1)
_GUIScrollBars_Init($Form2)
_GUIScrollBars_SetScrollInfoMax($Form2, $SB_HORZ, 0)
GUISetState(@SW_SHOW,$Form2)
_GUIScrollBars_SetScrollInfoMax($Form2, $SB_VERT, 0)
#cs 研究这个函数的第三个参数
_GUIScrollBars_SetScrollInfoMax($Form2, $SB_VERT, 0)
#ce 研究这个函数的第三个参数
While 1
1
WEnd
Func quit()
Exit
EndFunc
Func _test()
;随机创建整数个Button
$r = Random(1,10,1);
Local $bt[$r]
;假设每个按钮的高度为20
$bt_heigh = 60
;问题：如何确定这个参数？使得进度条能够刚好符合创建的button个数
;这个参数似乎与控件坐标不是1:1对应的，看帮助文档也没有具体的说明，很迷惑 $what_should_i_send_here
Local $what_should_i_send_here = 60 * $r - 200 ;这样写的结果似乎是错误的
MsgBox(0,'随机创建button个数为：',$r)
_GUIScrollBars_SetScrollInfoMax($Form2, $SB_VERT, $what_should_i_send_here )
GUISwitch($Form2)
For $i = 0 To $r-1
GUICtrlCreateButton(($i+1),1,$i * $bt_heigh , 100,$bt_heigh )
Next
EndFunc
Func WM_VSCROLL($hWnd, $Msg, $wParam, $lParam)
#forceref $Msg, $wParam, $lParam
Local $nScrollCode = BitAND($wParam, 0x0000FFFF)
Local $index = -1, $yChar, $yPos
Local $Min, $Max, $Page, $Pos, $TrackPos
For $x = 0 To UBound($aSB_WindowInfo) - 1
If $aSB_WindowInfo[$x] = $hWnd Then
$index = $x
$yChar = $aSB_WindowInfo[$index]
ExitLoop
EndIf
Next
If $index = -1 Then Return 0
; Get all the vertial scroll bar information
Local $tSCROLLINFO = _GUIScrollBars_GetScrollInfoEx($hWnd, $SB_VERT)
$Min = DllStructGetData($tSCROLLINFO, "nMin")
$Max = DllStructGetData($tSCROLLINFO, "nMax")
$Page = DllStructGetData($tSCROLLINFO, "nPage")
; Save the position for comparison later on
$yPos = DllStructGetData($tSCROLLINFO, "nPos")
$Pos = $yPos
$TrackPos = DllStructGetData($tSCROLLINFO, "nTrackPos")
Switch $nScrollCode
Case $SB_TOP ; user clicked the HOME keyboard key
DllStructSetData($tSCROLLINFO, "nPos", $Min)
Case $SB_BOTTOM ; user clicked the END keyboard key
DllStructSetData($tSCROLLINFO, "nPos", $Max)
Case $SB_LINEUP ; user clicked the top arrow
DllStructSetData($tSCROLLINFO, "nPos", $Pos - 1)
Case $SB_LINEDOWN ; user clicked the bottom arrow
DllStructSetData($tSCROLLINFO, "nPos", $Pos + 1)
Case $SB_PAGEUP ; user clicked the scroll bar shaft above the scroll box
DllStructSetData($tSCROLLINFO, "nPos", $Pos - $Page)
Case $SB_PAGEDOWN ; user clicked the scroll bar shaft below the scroll box
DllStructSetData($tSCROLLINFO, "nPos", $Pos + $Page)
Case $SB_THUMBTRACK ; user dragged the scroll box
DllStructSetData($tSCROLLINFO, "nPos", $TrackPos)
EndSwitch
;~ // Set the position and then retrieve it.Due to adjustments
;~ // by Windows it may not be the same as the value set.
DllStructSetData($tSCROLLINFO, "fMask", $SIF_POS)
_GUIScrollBars_SetScrollInfo($hWnd, $SB_VERT, $tSCROLLINFO)
_GUIScrollBars_GetScrollInfo($hWnd, $SB_VERT, $tSCROLLINFO)
;// If the position has changed, scroll the window and update it
$Pos = DllStructGetData($tSCROLLINFO, "nPos")
If ($Pos <> $yPos) Then
_GUIScrollBars_ScrollWindow($hWnd, 0, $yChar * ($yPos - $Pos))
$yPos = $Pos
EndIf
Return $GUI_RUNDEFMSG
EndFunc ;==>WM_VSCROLL 本帖最后由 fenhanxue 于 2017-3-1 22:27 编辑
一直溯源的线索：
1. _GUIScrollBars_SetScrollInfoMax来源于 GuiScrollBars.au3
2. 根据GuiScrollBars.au3发现_GUIScrollBars_SetScrollInfoMax的第三个参数 为 _GUIScrollBars_SetScrollRange($hWnd, $fnBar, $aRange, $nMax) 的第四个参数
3. 继续在 GuiScrollBars.au3中追踪 _GUIScrollBars_SetScrollRange的第四个参数，发现是
DllCall("user32.dll", "bool", "SetScrollRange", "hwnd", $hWnd, "int", $nBar, "int", $nMinPos, "int", $nMaxPos, "bool", True)
即这个参数为user32.dll里面的SetScrollRange
4. 继续追踪 user32.dll里面的SetScrollRange ，msdn的解释为：
https://msdn.microsoft.com/en-us/library/windows/desktop/bb787599(v=vs.85).aspx
5.至此，我找不到继续搜索的方向了，并且还是不理解如何确定这个参数跟实际坐标的对换比例 我也看不明白。
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