今天通过C#来实现一个简单的屏幕截图功能。实现思路，获取鼠标按下去的位置和鼠标左键释放的位置，计算这个区域的宽度和高度。然后通过 Graphics.CopyFromScreen 方法便可以获取到屏幕截图了。
下面通过C#+WPF来实现这个功能，代码如下：
XAML:
<Window x:Class="WPFCaptureScreenShot.CaptureWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="CaptureWindow"
AllowsTransparency="True"
WindowStyle="None"
Background="Black"
Opacity="0.1"
WindowState="Maximized"
MouseDown="CaptureWindow_MouseDown"
MouseMove="CaptureWindow_MouseMove">
<Canvas x:Name="CaptureCanvas"> </Canvas>
</Window>
public partial class CaptureWindow : Window
{
private double x;
private double y;
private double width;
private double height; private bool isMouseDown = false; public CaptureWindow()
{
InitializeComponent();
} private void CaptureWindow_MouseDown(object sender, MouseButtonEventArgs e)
{
isMouseDown = true;
x = e.GetPosition(null).X;
y = e.GetPosition(null).Y;
} private void CaptureWindow_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
{
if(isMouseDown)
{
// 1. 通过一个矩形来表示目前截图区域
System.Windows.Shapes.Rectangle rect = new System.Windows.Shapes.Rectangle();
double dx = e.GetPosition(null).X;
double dy = e.GetPosition(null).Y;
double rectWidth = Math.Abs(dx - x);
double rectHeight = Math.Abs(dy - y);
SolidColorBrush brush = new SolidColorBrush(Colors.White);
rect.Width = rectWidth;
rect.Height = rectHeight;
rect.Fill = brush;
rect.Stroke = brush;
rect.StrokeThickness = ;
if (dx < x)
{
Canvas.SetLeft(rect, dx);
Canvas.SetTop(rect, dy);
}
else
{
Canvas.SetLeft(rect, x);
Canvas.SetTop(rect, y);
} CaptureCanvas.Children.Clear();
CaptureCanvas.Children.Add(rect); if(e.LeftButton == MouseButtonState.Released)
{
CaptureCanvas.Children.Clear();
// 2. 获得当前截图区域
width = Math.Abs(e.GetPosition(null).X - x);
height = Math.Abs(e.GetPosition(null).Y - y); if(e.GetPosition(null).X > x)
{
CaptureScreen(x, y, width, height);
}
else
{
CaptureScreen(e.GetPosition(null).X, e.GetPosition(null).Y, width, height);
} isMouseDown = false;
x = 0.0;
y = 0.0;
this.Close();
}
}
} private void CaptureScreen(double x, double y, double width, double height)
{
int ix = Convert.ToInt32(x);
int iy = Convert.ToInt32(y);
int iw = Convert.ToInt32(width);
int ih = Convert.ToInt32(height); System.Drawing.Bitmap bitmap = new Bitmap(iw, ih);
using(System.Drawing.Graphics graphics = Graphics.FromImage(bitmap))
{
graphics.CopyFromScreen(ix, iy, , , new System.Drawing.Size(iw, ih)); SaveFileDialog dialog = new SaveFileDialog();
dialog.Filter = "Png Files|*.png";
if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
bitmap.Save(dialog.FileName, ImageFormat.Png);
}
}
}
运行效果：
源代码可以点击这里下载。
如果你有其他方式实现，欢迎与我分享。如果对代码有疑问，可以在评论中指出。感谢阅读。