WEBBROWSER中模拟鼠标点击(SendMessage/PostMessage)

浏览数：23 / 时间：2015年06月09日

好久没有写文章，发一篇顶顶博客访问量。别人建议转一些比较好的代码也贴过来，但是我打算这里主要发自己原创的代码，所以么。。流量该多少就多少吧。。。

回到主题，在webbrowser中点击某链接网上几乎都是用document对象模拟点击，这个方法基本能应对一般的情况，但是例如广告联盟的点击XXX就有检测机制（不多解释，你们懂的）。所以完全模拟鼠标的点击事件就比较完美。于是我用了最常见的SendMessage。

接下来就要解决一个问题，webbrowser的句柄问题。从控件本身得到的句柄不是真正的浏览窗口的句柄，用SPY++看一下就能看出来，这里不贴图了。按照这个窗体的结构，用以下代码可以获取到网页的窗口的句柄。
‘获得webbrowser的句柄
Private Function GetBrowserWindow(hWnd As Long) As Long
    Dim lngHnd As Long
    lngHnd = FindWindowEx(hWnd, 0, "Shell Embedding", vbNullString) ‘
    lngHnd = FindWindowEx(lngHnd, 0, "Shell DocObject View", vbNullString)
    lngHnd = FindWindowEx(lngHnd, 0, "Internet Explorer_Server", vbNullString)
    GetBrowserWindow = lngHnd
End Function

然后就是网页元素的定位，向哪个坐标发送点击。这里用了DOM对象遍历来获取具体位置。都知道网页上一个元素有offsetLeft,offsetWidth,offsetHeight,offsetTop属性，但是都是相对容器来说的，所以可以通过遍历相加得到这个元素的绝对位置（这个绝对也是相对于网页浏览器窗口来说的。。）。于是代码如下：
Private Sub GetPos(objA As Object)
    On Error Resume Next
    adW = objA.offsetWidth
    adH = objA.offsetHeight
    adX = objA.offsetLeft
    adY = objA.offsetTop
    Set objA = objA.parentNode   ‘遍历结点获取绝对位置
    Do While Not (objA Is Nothing)
        adX = adX + objA.offsetLeft
        adY = adY + objA.offsetTop
        Set objA = objA.parentNode
    Loop
    txtX.Text = CStr(adX)
    txtY.Text = CStr(adY)
    ‘Debug.Print "X:" & adX, "Y:" & adY, "W:" & adW, "H:" & adH, "P:" & adPos
End Sub

好了，主要的问题分析完毕，我不多说废话了，直接贴代码看吧。

‘获得webbrowser的句柄
Private Function GetBrowserWindow(hWnd As Long) As Long
    Dim lngHnd As Long
    lngHnd = FindWindowEx(hWnd, 0, "Shell Embedding", vbNullString) ‘
    lngHnd = FindWindowEx(lngHnd, 0, "Shell DocObject View", vbNullString)
    lngHnd = FindWindowEx(lngHnd, 0, "Internet Explorer_Server", vbNullString)
    GetBrowserWindow = lngHnd
End Function

Private Function IsURL(objHTML As Object) As Boolean
On Error Resume Next

    Dim strHTML As String, strURL As String

    IsURL = False
    strURL = LCase$(txtHost.Text)
    strHTML = LCase$(objHTML.innerhtml)   ‘都转成小写

    If InStr(strHTML, strURL) > 0 Then IsURL = True ‘是这个域名返回true

End Function

Private Sub GetPos(objA As Object)
On Error Resume Next

    adW = objA.offsetWidth
    adH = objA.offsetHeight
    adX = objA.offsetLeft
    adY = objA.offsetTop
    Set objA = objA.parentNode   ‘遍历结点获取绝对位置

    Do While Not (objA Is Nothing)
        adX = adX + objA.offsetLeft
        adY = adY + objA.offsetTop
        Set objA = objA.parentNode
    Loop

    txtX.Text = CStr(adX)
    txtY.Text = CStr(adY)
    ‘Debug.Print "X:" & adX, "Y:" & adY, "W:" & adW, "H:" & adH, "P:" & adPos
End Sub

‘‘获取坐标按钮点击事件
Private Sub cmdGetXY_Click()
On Error Resume Next

    Dim objHTML As Object
    Dim i       As Integer

    If txtHost.Text = "" Then
        ‘MsgBox "不写域名，搞我呀。。。"
        Exit Sub
    End If

    txtX.Text = ""
    txtY.Text = ""
    adX = 0
    adY = 0
    adW = 0
    adH = 0

    For i = 0 To 9
        Set objHTML = webB.Document.GetElementByID("bdfs" & CStr(i))

        If Not (objHTML Is Nothing) Then
            If IsURL(objHTML) Then
                Set objHTML = webB.Document.GetElementByID("dfs" & CStr(i))
                adPos = 1   ‘右侧链接区
                Call GetPos(objHTML)
                Exit For
            End If
        End If

Set objHTML = webB.Document.GetElementByID("400" & CStr(i))

        If Not (objHTML Is Nothing) Then
            If IsURL(objHTML) Then
                Set objHTML = webB.Document.GetElementByID("aw" & CStr(i - 1))
                adPos = 0
                Call GetPos(objHTML)
                Exit For
            End If
        End If

Set objHTML = webB.Document.GetElementByID("300" & CStr(i))

        If Not (objHTML Is Nothing) Then
            If IsURL(objHTML) Then
                Set objHTML = webB.Document.GetElementByID("aw" & CStr(i - 1))
                adPos = 2
                Call GetPos(objHTML)
                Exit For
            End If
        End If

    Next

    ‘If adX = 0 And adY = 0 Then MsgBox "没有找到。。。"

    Set objHTML = Nothing

End Sub

‘‘‘发送点击按钮点击事件
Private Sub cmdClick_Click()
    On Error Resume Next
    Dim x      As Long, y As Long
    Dim intRnd As Integer

Randomize ‘启动随机数

    If adX = 0 And adY = 0 Then
        ‘MsgBox "没有找到链接你也点。。。"
        Exit Sub
    End If

    wbHwnd = GetBrowserWindow(Me.hWnd) ‘得到句柄

    If adPos = 0 Then ‘在搜索结果区的上面
        webB.Document.parentwindow.Scroll 0, adY - adH + 8 ‘修正下数据正好对准
        x = 30 + Int((Rnd * adW) / 2)
        y = (Int((Rnd * adH) / 2) + 2) * &H10000
    ElseIf adPos = 1 Then ‘在右侧的推广链接区
        webB.Document.parentwindow.Scroll adX, adY - 11 ‘修正下数据
        x = 150 + Int((Rnd * adW) / 2)
        y = (Int((Rnd * adH) / 2) + 2) * &H10000
    ElseIf adPos = 2 Then ‘在搜索结果当中
        webB.Document.parentwindow.Scroll 0, adY - 11 ‘修正下数据
        x = 30 + Int((Rnd * adW) / 2)
        y = (Int((Rnd * adH) / 2) + 2) * &H10000
    End If

    ‘Debug.Print "Click:", x, y / &H10000
    PostMessage wbHwnd, WM_LBUTTONDOWN, 1&, x + y
    PostMessage wbHwnd, WM_LBUTTONUP, 1&, x + y

End Sub