如何阅读使用消息框内容文字及QUOT; user32.dll中＆QUOT;功能 [英] How to read a Message Box content text using the "user32.dll" functions

问题描述

我需要一个简单的胜利API内部C＃/ vb.net，读取文本出一个消息框。我有一个函数来读取一个消息框的标题，但我不知道如何获得内容的文字。 该消息框标题的功能是：

功能来检索与表单关联的弹出窗口，以及对 发现弹出的子窗口... 私人声明自动功能GetWindow库user32.dll中（_     BYVAL的hWnd作为IntPtr的，BYVAL uCmd长）作为IntPtr的 是，用于将消息发送到上按钮'的SendMessage超载 对话窗口... 私人声明自动SendMessage函数库user32.dll中别名SendMessage函数_     （BYVAL的HWND作为IntPtr的，BYVAL消息作为整数，wParam参数BYVAL作为整数，_      为ByRef lParam中的IntPtr）作为IntPtr的 用于检索窗口文本SendMessage函数重载... 私人声明自动功能SendMessageA库user32.dll中_     别名SendMessageA（BYVAL的HWND作为IntPtr的，BYVAL消息作为整数，_         BYVAL wParam中的IntPtr，为ByRef lParam中的IntPtr）作为IntPtr的

...

'该函数返回窗口的文本，使用这样我们就可以确认 我们有正确的对话窗口...... 私有函数GetWindowText函数（BYVAL WindowHandle作为IntPtr的）作为字符串     昏暗ptrRet作为IntPtr的     昏暗ptrLength作为IntPtr的     获取长度缓冲...     ptrLength = SendMessageA（_         WindowHandle，WM_GETTEXTLENGTH，IntPtr.Zero，IntPtr.Zero）     创建缓冲区返回值...     昏暗某人作为新System.Text.StringBuilder（ptrLength.ToInt32 + 1）     获取窗口文本...     ptrRet = SendMessageString（_         WindowHandle，WM_GETTEXT，ptrLength.ToInt32 + 1，SB）     获取返回值...     返回sb.ToString 结束如果

解决方案

您可能使用了错误的窗口句柄。该文本是由在消息框中客户端窗口中显示。您可以通过PInvoke的函数GetDlgItem（）获得它的手柄，通过ID 65535间谍++获得洞察构成了消息框窗口中的部分。

I need a simple win api inside c# / vb.net, to read a text out of a message box. I have a function to read a message box title, but i have no idea how to get the content text. The messagebox title function is:

' Function to retrieve the popup window associated with the form, as well as to
' find the child windows of the popup...
Private Declare Auto Function GetWindow Lib "user32.dll" ( _
    ByVal hWnd As IntPtr, ByVal uCmd As Long) As IntPtr

' Sendmessage overload that is used to send messages to the button on the
' dialog window...
Private Declare Auto 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 Auto 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

...

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

解决方案

You are probably using the wrong window handle. The text is displayed by a client window inside the message box. You can get its handle by pinvoke GetDlgItem(), passing ID 65535. Use Spy++ to get insight into the parts that make up the message box window.

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