如何在VB.NET中激活,移动和调整窗口大小

发布时间：2020-12-17 07:27:46 所属栏目：百科来源：网络整理

导读：我有一个窗口,我只知道我需要激活,调整大小并放置在屏幕左上角的标题(例如记事本). 因此,经过对MSDN和论坛的一些研究,我发现了一些应该实现这一目标的功能.我使用FindWindow按标题获取句柄,然后我使用GetWindowPlacement来查看记事本是否被最小化(如果没有,

我有一个窗口,我只知道我需要激活,调整大小并放置在屏幕左上角的标题(例如记事本).
因此,经过对MSDN和论坛的一些研究,我发现了一些应该实现这一目标的功能.我使用FindWindow按标题获取句柄,然后我使用GetWindowPlacement来查看记事本是否被最小化(如果没有,那么我只使用AppActivate,只需要激活它,如果它没有最小化).如果窗口是最小化的,那么我尝试使用SetWindowPlacement激活,调整大小并在一个命令中移动它.
这是我的代码：

<DllImport("user32.dll",SetLastError:=True,CharSet:=CharSet.Auto)> _
Private Shared Function FindWindow( _
 ByVal lpClassName As String,_
 ByVal lpWindowName As String) As IntPtr
End Function
<DllImport("user32.dll")> _
Private Shared Function GetWindowPlacement(ByVal hWnd As IntPtr,ByRef lpwndpl As WINDOWPLACEMENT) As Boolean
End Function
<DllImport("user32.dll")> _
Private Shared Function SetWindowPlacement(ByVal hWnd As IntPtr,ByRef lpwndpl As WINDOWPLACEMENT) As Boolean
End Function

Private Structure RECT
    Public Left As Integer
    Public Top As Integer
    Public Right As Integer
    Public Bottom As Integer
    Public Sub New(ByVal X As Integer,ByVal Y As Integer,ByVal X2 As Integer,ByVal Y2 As Integer)
        Me.Left = X
        Me.Top = Y
        Me.Right = X2
        Me.Bottom = Y2
    End Sub
End Structure

Private Structure WINDOWPLACEMENT
    Public Length As Integer
    Public flags As Integer
    Public showCmd As ShowWindowCommands
    Public ptMinPosition As POINTAPI
    Public ptMaxPosition As POINTAPI
    Public rcNormalPosition As RECT
End Structure

Enum ShowWindowCommands As Integer
    Hide = 0
    Normal = 1
    ShowMinimized = 2
    Maximize = 3  
    ShowMaximized = 3
    ShowNoActivate = 4
    Show = 5
    Minimize = 6
    ShowMinNoActive = 7
    ShowNA = 8
    Restore = 9
    ShowDefault = 10
    ForceMinimize = 11
End Enum

Public Structure POINTAPI
    Public X As Integer
    Public Y As Integer
    Public Sub New(ByVal X As Integer,ByVal Y As Integer)
        Me.X = X
        Me.Y = Y
    End Sub
End Structure

实际执行在这里：

Dim wp As WINDOWPLACEMENT
wp.Length = Marshal.SizeOf(wp)
GetWindowPlacement(FindWindow(Nothing,"Notepad"),wp)
If wp.showCmd = ShowWindowCommands.ShowMinimized Then
    Dim wp2 As WINDOWPLACEMENT
    wp2.showCmd = ShowWindowCommands.ShowMaximized
    wp2.ptMinPosition = wp.ptMinPosition
    wp2.ptMaxPosition = New POINTAPI(0,0)
    wp2.rcNormalPosition = New RECT(0,816,639) 'this is the size I want
    wp2.flags = wp.flags
    wp2.Length = Marshal.SizeOf(wp2)
    SetWindowPlacement(FindWindow(Nothing,wp2)
    Else
        AppActivate("Notepad")

所以我尝试运行它,但它只是激活窗口,而矩形也应该调整它的大小.那么我做错了什么？有没有更简单的方法来实现这一切？很抱歉这篇冗长的帖子

解决方法

我不得不做类似的事情,并使用user32.dll的SetWindowPos函数

这是一个vb.net实现：

Imports System
Imports System.Runtime.InteropServices
Imports System.Diagnostics

Public Class HookUtil

    Public Const SWP_NOMOVE As Short = &H2
    Public Const SWP_NOSIZE As Short = 1
    Public Const SWP_NOZORDER As Short = &H4
    Public Const SWP_SHOWWINDOW As Short = &H40
    Shared ReadOnly HWND_BOTTOM As IntPtr = New IntPtr(1)

    <DllImport("user32.dll",EntryPoint:="SetWindowPos")> _
    Public Shared Function SetWindowPos( _
 hWnd As IntPtr,_
 hWndInsertAfter As IntPtr,_
 x As Int32,y As Int32,cx As Int32,cy As Int32,wFlags As Int32) As IntPtr
    End Function


    Public Shared Sub HookWindow()

        Dim Processes As Process() = Process.GetProcessesByName("Notepad")

        For Each p As Process In Processes

            Dim handle As IntPtr = p.MainWindowHandle
            If handle <> IntPtr.Zero Then
                SetWindowPos(handle,HWND_BOTTOM,200,SWP_NOZORDER Or SWP_NOSIZE Or SWP_SHOWWINDOW)
            End If
        Next

    End Sub

End Class

你打电话给：

HookUtil.HookWindow()

这是一个C#实现：

using System;
using System.Runtime.InteropServices;
using System.Diagnostics;

namespace csharpsandbox

{
    public class HookUtil
    {
        // hooks window handle and repositions to specified coords

        [DllImport("user32.dll",EntryPoint = "SetWindowPos")]
        public static extern IntPtr SetWindowPos(IntPtr hWnd,IntPtr hWndInsertAfter,int x,int Y,int cx,int cy,int wFlags);

        [DllImport("kernel32.dll")]
        static extern IntPtr LoadLibrary(string lpFileName);

        const short SWP_NOMOVE = 0X2;
        const short SWP_NOSIZE = 1;
        const short SWP_NOZORDER = 0X4;
        const int SWP_SHOWWINDOW = 0x0040;
        static readonly IntPtr HWND_BOTTOM = new IntPtr(1);

        public static void HookWindow()
        {

            Process[] parray = System.Diagnostics.Process.GetProcessesByName("Notepad");
            foreach (Process p in parray)
            {
                IntPtr handle = p.MainWindowHandle;
                if (handle != IntPtr.Zero)
                {
                    SetWindowPos(handle,SWP_NOZORDER | SWP_NOSIZE | SWP_SHOWWINDOW);
                }
            }

        }

    }
}

你打电话给：

HookUtil.HookWindow();

显然,这里的值(进程名称,x,y坐标)是硬编码的.为了使这个更有用,你想要使那些可设置.

（编辑：李大同）

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