[C#.NET][VB.NET] 利用Win32 API 函數 ShowWindowAsync / ShowWindow 改變視窗大小
1.需要匯入 System.Runtime.InteropServices 命名空間
2.宣告 ShowWindowAsync 函數
[DllImport("user32.dll")]
private static extern bool ShowWindowAsync(
IntPtr hWnd,
int nCmdShow
);
3.宣告 ShowWindow函數
[DllImport("user32.dll")]
public static extern int ShowWindow(
int hwnd,
int nCmdShow
);
4.宣告API常數定義
//API 常數定義
private const int SW_HIDE = 0;
private const int SW_NORMAL = 1;
private const int SW_MAXIMIZE = 3;
private const int SW_SHOWNOACTIVATE = 4;
private const int SW_SHOW = 5;
private const int SW_MINIMIZE = 6;
private const int SW_RESTORE = 9;
private const int SW_SHOWDEFAULT = 10;
5.上述函數功能相同，都是用來設定視窗大小，不同的是宣告的型態不一樣需轉型。
ShowWindowAsync(this.Handle, SW_MINIMIZE);
ShowWindow((int)this.Handle, SW_MINIMIZE);
6.若是把int 改成IntPtr ，使用ShowWindow就不用轉型，所以在宣告時就可以考慮資料型態，必免轉型所耗的資源。
[DllImport("user32.dll")]
public static extern int ShowWindow(
int hwnd,
int nCmdShow
);
C#完整範例
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace CS_WindowsResize
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//API 常數定義
private const int SW_HIDE = 0;
private const int SW_NORMAL = 1;
private const int SW_MAXIMIZE = 3;
private const int SW_SHOWNOACTIVATE = 4;
private const int SW_SHOW = 5;
private const int SW_MINIMIZE = 6;
private const int SW_RESTORE = 9;
private const int SW_SHOWDEFAULT = 10;
[DllImport("user32.dll")]
private static extern bool ShowWindowAsync(
IntPtr hWnd,
int nCmdShow
);
[DllImport("user32.dll")]
public static extern int ShowWindow(
int hwnd,
int nCmdShow
);
private void button1_Click(object sender, EventArgs e)
{
//最小化
ShowWindowAsync(this.Handle, SW_MINIMIZE);
}
private void button2_Click(object sender, EventArgs e)
{
//最大化
ShowWindowAsync(this.Handle, SW_MAXIMIZE);
}
private void button3_Click(object sender, EventArgs e)
{
//還原
ShowWindowAsync(this.Handle, SW_RESTORE);
}
private void button4_Click(object sender, EventArgs e)
{
//最小化
ShowWindow((int)this.Handle, SW_MINIMIZE);
}
private void button5_Click(object sender, EventArgs e)
{
//最大化
ShowWindow((int)this.Handle, SW_MAXIMIZE);
}
private void button6_Click(object sender, EventArgs e)
{
//還原
ShowWindow((int)this.Handle, SW_RESTORE);
}
}
}
VB完整範例
Imports System.Runtime.InteropServices
Public Class Form1
'API 常數定義
Private Const SW_HIDE As Integer = 0
Private Const SW_NORMAL As Integer = 1
Private Const SW_MAXIMIZE As Integer = 3
Private Const SW_SHOWNOACTIVATE As Integer = 4
Private Const SW_SHOW As Integer = 5
Private Const SW_MINIMIZE As Integer = 6
Private Const SW_RESTORE As Integer = 9
Private Const SW_SHOWDEFAULT As Integer = 10
<DllImport("user32.dll")> Private Shared Function ShowWindowAsync(ByVal hWnd As IntPtr, ByVal nCmdShow As Integer) As Boolean
End Function
<DllImport("user32.dll")> Public Shared Function ShowWindow(ByVal hwnd As Integer, ByVal nCmdShow As Integer) As Integer
End Function
Private Sub button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button1.Click
'最小化
ShowWindowAsync(Me.Handle, SW_MINIMIZE)
End Sub
Private Sub button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button2.Click
'最大化
ShowWindowAsync(Me.Handle, SW_MAXIMIZE)
End Sub
Private Sub button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button3.Click
'還原
ShowWindowAsync(Me.Handle, SW_RESTORE)
End Sub
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
'最小化
ShowWindow(CInt(Me.Handle), SW_MINIMIZE)
End Sub
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
'最大化
ShowWindow(CInt(Me.Handle), SW_MAXIMIZE)
End Sub
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
'還原
ShowWindow(CInt(Me.Handle), SW_RESTORE)
End Sub
End Class
7.範例下載：WindowsResize.rar
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Microsoft MVP Award 2010~2017 C# 第四季
Microsoft MVP Award 2018~2022 .NET
