1.需要匯入名稱空間

2.宣告 ShowWindowAsync 函式

[DllImport("user32.dll")]

private static extern bool ShowWindowAsync(

IntPtr hWnd,

int nCmdShow

);

3.宣告 ShowWindow函式

[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.上述函式功能相同，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

"user32.dll")> Private Shared Function ShowWindowAsync(ByVal hWnd As IntPtr, ByVal nCmdShow As Integer) As Boolean

End Function

"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

利用Win32 API 函式 ShowWindowAsync / ShowWindow 改變視窗大小

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