C#模拟PrtScn实现截屏

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有了之前的基础知识了解，如今開始实现PrtScn和Alt+PrtScn。

首先新建一个WPF应用程序，命名为PrintscreenAndAltPrintScreen

导入keybd_event方法 ：

须要为DllImport加入using System.Runtime.InteropServices;

[DllImport("user32.dll")]

static extern void keybd_event

(

    byte bVk,// 虚拟键值

    byte bScan,// 硬件扫描码

    uint dwFlags,// 动作标识

    IntPtr dwExtraInfo// 与键盘动作关联的辅加信息

);

编写PrtScn函数：

public void PrintScreen()

{

    keybd_event((byte)0x2c, 0, 0x0, IntPtr.Zero);//down

    System.Windows.Forms.Application.DoEvents(); //加入引用system.windows.forms

    keybd_event((byte)0x2c, 0, 0x2, IntPtr.Zero);//up

    System.Windows.Forms.Application.DoEvents();

}

编写Alt+PrtScn函数：

public void AltPrintScreen()

{

    keybd_event((byte)Keys.Menu, 0, 0x0, IntPtr.Zero);

    keybd_event((byte)0x2c, 0, 0x0, IntPtr.Zero);//down

    System.Windows.Forms.Application.DoEvents();

    System.Windows.Forms.Application.DoEvents();

    keybd_event((byte)0x2c, 0, 0x2, IntPtr.Zero);//up

    keybd_event((byte)Keys.Menu, 0, 0x2, IntPtr.Zero);

    System.Windows.Forms.Application.DoEvents();

    System.Windows.Forms.Application.DoEvents();

}

编写从剪贴板获得图片函数：

须要加入using System.Drawing;加入引用System.Drawing

private Bitmap GetScreenImage()

{

    System.Windows.Forms.IDataObject newobject = null;

    Bitmap NewBitmap = null;

    try

    {

        System.Windows.Forms.Application.DoEvents();

        newobject = System.Windows.Forms.Clipboard.GetDataObject();

        if (System.Windows.Forms.Clipboard.ContainsImage())

        {

            NewBitmap = (Bitmap)(System.Windows.Forms.Clipboard.GetImage().Clone());

        }

        return NewBitmap;

    }

    catch(Exception ex)

    {

        Console.WriteLine(ex.Message);

        return null;

    }

}

编写xmal程序：

简单加入两个Image控件和两个button按钮

 <Window x:Class="PrintscreenAndAltPrintScreen.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="768" Width="1024">

     <Grid>

         <Image Name="image1" Margin="45,30,562,203">

         </Image>

         <Button Content="PrtScn" Height="24" HorizontalAlignment="Left" Margin="182,552,0,0" Name="button1" VerticalAlignment="Top" Width="95" Click="button1_Click" />

         <Button Content="Alt+PrtScn" Height="24" HorizontalAlignment="Left" Margin="718,552,0,0" Name="button2" VerticalAlignment="Top" Width="95" Click="button2_Click" />

         <Image Margin="566,30,41,213" Name="image2" />

     </Grid>

 </Window>

对两个按钮加入click事件：

这里须要把Bitmap转为BitmapSource。能够參阅博客：WPF(C#)中Bitmap与BitmapImage相互转换

private void button2_Click(object sender, RoutedEventArgs e)

{

    image2.Source = null;

    AltPrintScreen();

    Bitmap bitmap = GetScreenImage();

    IntPtr ip = bitmap.GetHbitmap();//从GDI+ Bitmap创建GDI位图对象

//Imaging.CreateBitmapSourceFromHBitmap方法，基于所提供的非托管位图和调色板信息的指针。返回一个托管的BitmapSource

    BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(ip, IntPtr.Zero, Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());

    image2.Source = bitmapSource;

}

private void button1_Click(object sender, RoutedEventArgs e)

{

    image1.Source = null;

    PrintScreen();

    Bitmap bitmap = GetScreenImage();

    IntPtr ip = bitmap.GetHbitmap();//从GDI+ Bitmap创建GDI位图对象

//Imaging.CreateBitmapSourceFromHBitmap方法//基于所提供的非托管位图和调色板信息的指针，返回一个托管的BitmapSource

    BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(ip, IntPtr.Zero, Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());

    image1.Source = bitmapSource;

}

最后对DoEvents 方法的一点解释：

Application.DoEvents 方法

处理当前在消息队列中的全部 Windows 消息。

语法：