vb.net获取网页中对话框的内容

'api constant declarations...

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Const WM_GETTEXT As Long = HD

Const WM_GETTEXTLENGTH As Long = HE

Const GW_ENABLEDPOPUP As Long = 6

Const BM_CLICK As Long = HF5

Const GW_CHILD As Long = 5

Const GW_HWNDNEXT As Long = 2

'function to retrieve the popup window associated with the form, as well as to find the child windows of the popup...

Private Declare Function GetWindow Lib "user32.dll" (ByVal hWnd As IntPtr, ByVal uCmd As Integer) As IntPtr

Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Integer

'sendmessage overload that is used to send messages to the button on the dialog window...

Private Declare Function SendMessage Lib "user32.dll" Alias "SendMessage" (ByVal hWnd As IntPtr, ByVal Msg As Integer, _

ByVal wParam As Integer, ByRef lParam As IntPtr) As IntPtr

'sendmessage overloads used to retrieve the window text...

Private Declare Function SendMessageA Lib "user32.dll" Alias "SendMessageA" (ByVal hWnd As IntPtr, ByVal Msg As Integer, _

ByVal wParam As IntPtr, ByRef lParam As IntPtr) As IntPtr

DllImport("User32.dll", CharSet:=CharSet.Auto, Entrypoint:="SendMessage") _

Public Shared Function SendMessageString(ByVal hwnd As IntPtr, _

ByVal wMsg As Integer, ByVal wparam As Integer, ByVal lparam As System.Text.StringBuilder) As IntPtr

End Function

'these next three functions are used to enumerate the Windows handles of all Windows sited on the specified parent...

Function GetChildWindowHandles(ByVal ParentWindowHandle As IntPtr) As ArrayList

Dim b As Boolean

Dim ptrChild As IntPtr

Dim clsRet As New ArrayList

'get first child handle...

ptrChild = GetChildWindowHandle(ParentWindowHandle)

Do Until ptrChild.Equals(IntPtr.Zero)

'add to collection of handles...

clsRet.Add(ptrChild)

'get next child...

ptrChild = GetNextWindowHandle(ptrChild)

Loop

'return...

Return clsRet

End Function

Function GetChildWindowHandle(ByVal ParentWindowHandle As IntPtr) As IntPtr

Return GetWindow(ParentWindowHandle, GW_CHILD)

End Function

Function GetNextWindowHandle(ByVal CurrentWindowhandle As IntPtr) As IntPtr

Return GetWindow(CurrentWindowhandle, GW_HWNDNEXT)

End Function

'this function returns the text of the window, used so that we can confirm that we have the right dialog window...

Function GetWindowText(ByVal WindowHandle As IntPtr) As String

Dim ptrRet As IntPtr

Dim ptrLength As IntPtr

'get length for buffer...

ptrLength = SendMessageA(WindowHandle, WM_GETTEXTLENGTH, IntPtr.Zero, IntPtr.Zero)

'create buffer for return value...

Dim sb As New System.Text.StringBuilder(ptrLength.ToInt32 + 1)

'get window text...

ptrRet = SendMessageString(WindowHandle, WM_GETTEXT, ptrLength.ToInt32 + 1, sb)

'get return value...

Return sb.ToString

End Function

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim ptrDialogWindow As IntPtr = FindWindow(vbNullString, "Microsoft Internet Explorer")

Dim clsChildHandles As ArrayList = GetChildWindowHandles(ptrDialogWindow)

For Each ptrHandle As IntPtr In clsChildHandles

Dim str As String = GetWindowText(ptrHandle)

If str "" And str "确定" Then

MsgBox(str)

End If

Next

End Sub

您好，请问VB.NET中如何获得弹出对话框中的文字。

Dim tmp = InputBox("输入你需要的文字", "我是标题", "我是默认值")

vb.net中用什么方法显示对话框？

用msgbox（）显示对话框

msgbox的用法很多，基础的就是msgbox（“你要显示的内容”）

或者msgbox（“你要显示的内容”,16,"对话框名称"）'16是对话框的类型，还有几个键的组合代码，这个你可以

查查

，很多，或者你也可以用提示给出的类型，比如MsgBoxStyle.Exclamation就是显示错误对话框，

VB.net怎么弹出如下类似的对话框（看图）？

可以利用msgbox 实现，也可以通过另外的窗体上画出表格实现

方法一，利用msgbox：

Private Sub Command1_Click()Dim a As Long, b As Long, c As LongMsgBox "┌────┬────┬────┐" vbCrLf _ "│ 库存1 │ 库存2 │ 库存3 │" vbCrLf _ "├────┼────┼────┤" vbCrLf _ "│" formatstr(a) "│" formatstr(b) "│" formatstr(c) "│" vbCrLf _ "└────┴────┴────┘" End SubPrivate Function formatstr(ByVal inputStr As String) As StringDim j As Integerj = (8 - Len(inputStr)) \ 2formatstr = Space(j) inputStr Space(j) Space((8 - Len(inputStr)) Mod 2)End Function

方法二，利用窗体实现：

’新建form2窗体‘将以下代码复制到form2窗体中Private Sub Form_Load()ShowPrint "┌────┬────┬────┐" vbCrLf _ "│ 库存1 │ 库存2 │ 库存3 │" vbCrLf _ "├────┼────┼────┤" vbCrLf _ "│" formatstr(a) "│" formatstr(b) "│" formatstr(c) "│" vbCrLf _ "└────┴────┴────┘" End SubPrivate Function formatstr(ByVal inputStr As String) As StringDim j As Integerj = (8 - Len(inputStr)) \ 2formatstr = Space(j) inputStr Space(j) Space((8 - Len(inputStr)) Mod 2)End Function‘将以下代码复制在form1窗体中Private Sub Command1_Click()Form2.ShowEnd Sub

vb.net 鼠标停留在label，textbox上时，如何显示提示信息

Label 控件用于显示用户不能编辑的文本或图像。含义：用于显示标签

TextBox 控件通常用于可编辑文本，不过也可使其成为只读控件，文本框用于获取用户输入或显示文本。

这就是区别，Label只能显示，而TextBox可以修改，输入数据

安装VB.net遇到弹出以下的提示框该怎么办？

1、安装文件没有做好

2、生成的目录中有多个文件，必须都放在同一目录下

文章名称：关于vb.net获取提示框的信息
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