WPF仿微信实现截图功能的方法详解

第WPF仿微信实现截图功能的方法详解目录前言一、ScreenCut.cs代码如下二、ScreenCut.xaml代码如下三、ScreenCutExample.xaml代码如下每日一笑

肚子疼，去厕所排便，结果什么都没拉出来。看着自己坐在马桶上痛苦又努力却一无所获的样子，仿佛看到了自己平凡的一生。

前言

有小伙伴需要在软件反馈窗体增加截图功能需求，所以今天来实现一个仿微信的截图。

效果预览（更多效果请下载源码体验）

一、ScreenCut.cs代码如下

usingMicrosoft.Win32;

usingSystem;

usingSystem.Collections.Generic;

usingSystem.Drawing.Drawing2D;

usingSystem.Drawing.Text;

usingSystem.Linq;

usingSystem.Text;

usingSystem.Windows;

usingSystem.Windows.Controls;

usingSystem.Windows.Input;

usingSystem.Windows.Media;

usingSystem.Windows.Media.Imaging;

usingSystem.Windows.Shapes;

namespaceWPFDevelopers.Controls

[TemplatePart(Name=CanvasTemplateName,Type=typeof(Canvas))]

[TemplatePart(Name=RectangleLeftTemplateName,Type=typeof(Rectangle))]

[TemplatePart(Name=RectangleTopTemplateName,Type=typeof(Rectangle))]

[TemplatePart(Name=RectangleRightTemplateName,Type=typeof(Rectangle))]

[TemplatePart(Name=RectangleBottomTemplateName,Type=typeof(Rectangle))]

[TemplatePart(Name=BorderTemplateName,Type=typeof(Border))]

[TemplatePart(Name=WrapPanelTemplateName,Type=typeof(WrapPanel))]

[TemplatePart(Name=ButtonSaveTemplateName,Type=typeof(Button))]

[TemplatePart(Name=ButtonCancelTemplateName,Type=typeof(Button))]

[TemplatePart(Name=ButtonCompleteTemplateName,Type=typeof(Button))]

publicclassScreenCut:Window

privateconststringCanvasTemplateName="PART_Canvas";

privateconststringRectangleLeftTemplateName="PART_RectangleLeft";

privateconststringRectangleTopTemplateName="PART_RectangleTop";

privateconststringRectangleRightTemplateName="PART_RectangleRight";

privateconststringRectangleBottomTemplateName="PART_RectangleBottom";

privateconststringBorderTemplateName="PART_Border";

privateconststringWrapPanelTemplateName="PART_WrapPanel";

privateconststringButtonSaveTemplateName="PART_ButtonSave";

privateconststringButtonCancelTemplateName="PART_ButtonCancel";

privateconststringButtonCompleteTemplateName="PART_ButtonComplete";

privateCanvas_canvas;

privateRectangle_rectangleLeft,_rectangleTop,_rectangleRight,_rectangleBottom;

privateBorder_border;

privateWrapPanel_wrapPanel;

privateButton_buttonSave,_buttonCancel,_buttonComplete;

privateRectrect;

privatePointpointStart,pointEnd;

privateboolisMouseUp=false;

staticScreenCut()

DefaultStyleKeyProperty.OverrideMetadata(typeof(ScreenCut),newFrameworkPropertyMetadata(typeof(ScreenCut)));

publicoverridevoidOnApplyTemplate()

base.OnApplyTemplate();

_canvas=GetTemplateChild(CanvasTemplateName)asCanvas;

_rectangleLeft=GetTemplateChild(RectangleLeftTemplateName)asRectangle;

_rectangleTop=GetTemplateChild(RectangleTopTemplateName)asRectangle;

_rectangleRight=GetTemplateChild(RectangleRightTemplateName)asRectangle;

_rectangleBottom=GetTemplateChild(RectangleBottomTemplateName)asRectangle;

_border=GetTemplateChild(BorderTemplateName)asBorder;

_wrapPanel=GetTemplateChild(WrapPanelTemplateName)asWrapPanel;

_buttonSave=GetTemplateChild(ButtonSaveTemplateName)asButton;

if(_buttonSave!=null)

_buttonSave.Click+=_buttonSave_Click;

_buttonCancel=GetTemplateChild(ButtonCancelTemplateName)asButton;

if(_buttonCancel!=null)

_buttonCancel.Click+=_buttonCancel_Click;

_buttonComplete=GetTemplateChild(ButtonCompleteTemplateName)asButton;

if(_buttonComplete!=null)

_buttonComplete.Click+=_buttonComplete_Click;

this._canvas.Background=newImageBrush(ChangeBitmapToImageSource(CaptureScreen()));

_rectangleLeft.Width=_canvas.Width;

_rectangleLeft.Height=_canvas.Height;

privatevoid_buttonSave_Click(objectsender,RoutedEventArgse)

SaveFileDialogdlg=newSaveFileDialog();

dlg.FileName=$"WPFDevelopers{DateTime.Now.ToString("yyyyMMddHHmmss")}.jpg";

dlg.DefaultExt=".jpg";

dlg.Filter="imagefile|*.jpg";

if(dlg.ShowDialog()==true)

BitmapEncoderpngEncoder=newPngBitmapEncoder();

pngEncoder.Frames.Add(BitmapFrame.Create(CutBitmap()));

using(varfs=System.IO.File.OpenWrite(dlg.FileName))

pngEncoder.Save(fs);

fs.Dispose();

fs.Close();

Close();

privatevoid_buttonComplete_Click(objectsender,RoutedEventArgse)

Clipboard.SetImage(CutBitmap());

Close();

CroppedBitmapCutBitmap()

varrenderTargetBitmap=newRenderTargetBitmap((int)_canvas.Width,

(int)_canvas.Height,96d,96d,System.Windows.Media.PixelFormats.Default);

renderTargetBitmap.Render(_canvas);

returnnewCroppedBitmap(renderTargetBitmap,newInt32Rect((int)rect.X,(int)rect.Y,(int)rect.Width,(int)rect.Height));

privatevoid_buttonCancel_Click(objectsender,RoutedEventArgse)

Close();

protectedoverridevoidOnPreviewKeyDown(KeyEventArgse)

if(e.Key==Key.Escape)

Close();

protectedoverridevoidOnPreviewMouseLeftButtonDown(MouseButtonEventArgse)

if(!isMouseUp)

_wrapPanel.Visibility=Visibility.Hidden;

pointStart=e.GetPosition(_canvas);

pointEnd=pointStart;

rect=newRect(pointStart,pointEnd);

protectedoverridevoidOnPreviewMouseMove(MouseEventArgse)

if(e.LeftButton==MouseButtonState.Pressed!isMouseUp)

varcurrent=e.GetPosition(_canvas);

MoveAllRectangle(current);

protectedoverridevoidOnPreviewMouseLeftButtonUp(MouseButtonEventArgse)

if(!isMouseUp)

_wrapPanel.Visibility=Visibility.Visible;

Canvas.SetLeft(this._wrapPanel,rect.X+rect.Width-this._wrapPanel.ActualWidth);

Canvas.SetTop(this._wrapPanel,rect.Y+rect.Height+4);

isMouseUp=true;

voidMoveAllRectangle(Pointcurrent)

pointEnd=current;

rect=newRect(pointStart,pointEnd);

this._rectangleLeft.Width=rect.X;

this._rectangleLeft.Height=_canvas.Height;

Canvas.SetLeft(this._rectangleTop,this._rectangleLeft.Width);

this._rectangleTop.Width=rect.Width;

doubleh=0.0;

if(current.YpointStart.Y)

h=current.Y;

else

h=current.Y-rect.Height;

this._rectangleTop.Height=h;

Canvas.SetLeft(this._rectangleRight,this._rectangleLeft.Width+rect.Width);

this._rectangleRight.Width=_canvas.Width-(rect.Width+this._rectangleLeft.Width);

this._rectangleRight.Height=_canvas.Height;

Canvas.SetLeft(this._rectangleBottom,this._rectangleLeft.Width);

Canvas.SetTop(this._rectangleBottom,rect.Height+this._rectangleTop.Height);

this._rectangleBottom.Width=rect.Width;

this._rectangleBottom.Height=_canvas.Height-(rect.Height+this._rectangleTop.Height);

this._border.Height=rect.Height;

this._border.Width=rect.Width;

Canvas.SetLeft(this._border,rect.X);

Canvas.SetTop(this._border,rect.Y);

System.Drawing.BitmapCaptureScreen()

varbmpCaptured=newSystem.Drawing.Bitmap((int)SystemParameters.PrimaryScreenWidth,(int)SystemParameters.PrimaryScreenHeight,System.Drawing.Imaging.PixelFormat.Format24bppRgb);

using(System.Drawing.Graphicsg=System.Drawing.Graphics.FromImage(bmpCaptured))

g.SmoothingMode=SmoothingMode.AntiAlias;

g.CompositingQuality=CompositingQuality.HighQuality;

g.InterpolationMode=InterpolationMode.HighQualityBicubic;

g.TextRenderingHint=TextRenderingHint.ClearTypeGridFit;

g.PixelOffsetMode=PixelOffsetMode.HighQuality;

g.CopyFromScreen(0,0,0,0,bmpCaptured.Size,System.Drawing.CopyPixelOperation.SourceCopy);

returnbmpCaptured;

[System.Runtime.InteropServices.DllImport("gdi32.dll")]

publicstaticexternboolDeleteObject(IntPtrhObject);

ImageSourceChangeBitmapToImageSource(System.Drawing.Bitmapbitmap)

IntPtrhBitmap=bitmap.GetHbitmap();

ImageSourcewpfBitmap=System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(

hBitmap,

IntPtr.Zero,

Int32Rect.Empty,

BitmapSizeOptions.FromEmptyOptions());

if(!DeleteObject(hBitmap))

thrownewSystem.ComponentModel.Win32Exception();

returnwpfBitmap;

}

二、ScreenCut.xaml代码如下

ResourceDictionaryxmlns="/winfx/2006/xaml/presentation"

xmlns:x="/winfx/2006/xaml"

xmlns:controls="clr-namespace:WPFDevelopers.Controls"

ResourceDictionary.MergedDictionaries

ResourceDictionarySource="Basic/ControlBasic.xaml"/

ResourceDictionarySource="../Styles/Styles.Buttons.xaml"/

/ResourceDictionary.MergedDictionaries

Stylex:Key="RectangleStyle"TargetType="{x:TypeRectangle}"

SetterProperty="Fill"Value="{StaticResourceBlackSolidColorBrush}"/

SetterProperty="Opacity"Value=".5"/

/Style

StyleTargetType="{x:Typecontrols:ScreenCut}"BasedOn="{StaticResourceControlBasicStyle}"

SetterProperty="WindowState"Value="Maximized"/

SetterProperty="WindowStyle"Value="None"/

SetterProperty="Template"

Setter.Value

ControlTemplateTargetType="{x:Typecontrols:ScreenCut}"

Canvasx:Name="PART_Canvas"

Width="{BindingSource={x:StaticSystemParameters.PrimaryScreenWidth}}"

Height="{BindingSource={x:StaticSystemParameters.PrimaryScreenHeight}}"

Rectanglex:Name="PART_RectangleLeft"/

Rectanglex:Name="PART_RectangleTop"/

Rectanglex:Name="PART_RectangleRight"/

Rectanglex:Name="PART_RectangleBottom"/

Borderx:Name="PART_Border"BorderBrush="{StaticResourceSuccessPressedSolidColorBrush}"

BorderThickness="1"/

WrapPanelx:Name="PART_WrapPanel"

Visibility="Hidden"Panel.ZIndex="99"

Height="38"Back