本文概述
- 活动的Winform窗口截图
- 全屏截图
- 更多信息
在本文中, 你将学习如何对监视器或仅对指定的winform窗口进行屏幕截图。
我们提供2种不同的方法来实现每种屏幕截图类型。如果要使用那些使用ScreenCapture类的方法, 则在项目中需要以下类, 代码如下, 请不要忘记根据更改命名空间你的项目之一:
注意:如果使用不需要ScreenCapture的方法, 则不需要此类, 因为可以使用仅使用CopyFromScreen方法的第二个选项。
using System;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;
namespace ChangeThisNamespace{/// <
summary>
/// Provides functions to capture the entire screen, or a particular window, and save it to a file./// <
/summary>
public class ScreenCapture{/// <
summary>
/// Creates an Image object containing a screen shot of the entire desktop/// <
/summary>
/// <
returns>
<
/returns>
public Image CaptureScreen(){return CaptureWindow(User32.GetDesktopWindow());
}/// <
summary>
/// Creates an Image object containing a screen shot of a specific window/// <
/summary>
/// <
param name="handle">
The handle to the window. (In windows forms, this is obtained by the Handle property)<
/param>
/// <
returns>
<
/returns>
public Image CaptureWindow(IntPtr handle){// get te hDC of the target windowIntPtr hdcSrc = http://www.srcmini.com/User32.GetWindowDC(handle);
// get the sizeUser32.RECT windowRect = new User32.RECT();
User32.GetWindowRect(handle, ref windowRect);
int width = windowRect.right - windowRect.left;
int height = windowRect.bottom - windowRect.top;
// create a device context we can copy toIntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to, // using GetDeviceCaps to get the width/heightIntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc, width, height);
// select the bitmap objectIntPtr hOld = GDI32.SelectObject(hdcDest, hBitmap);
// bitblt overGDI32.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, GDI32.SRCCOPY);
// restore selectionGDI32.SelectObject(hdcDest, hOld);
// clean up GDI32.DeleteDC(hdcDest);
User32.ReleaseDC(handle, hdcSrc);
// get a .NET image object for itImage img = Image.FromHbitmap(hBitmap);
// free up the Bitmap objectGDI32.DeleteObject(hBitmap);
return img;
}/// <
summary>
/// Captures a screen shot of a specific window, and saves it to a file/// <
/summary>
/// <
param name="handle">
<
/param>
/// <
param name="filename">
<
/param>
/// <
param name="format">
<
/param>
public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format){Image img = CaptureWindow(handle);
img.Save(filename, format);
}/// <
summary>
/// Captures a screen shot of the entire desktop, and saves it to a file/// <
/summary>
/// <
param name="filename">
<
/param>
/// <
param name="format">
<
/param>
public void CaptureScreenToFile(string filename, ImageFormat format){Image img = CaptureScreen();
img.Save(filename, format);
}/// <
summary>
/// Helper class containing Gdi32 API functions/// <
/summary>
private class GDI32{public const int SRCCOPY = 0x00CC0020;
// BitBlt dwRop parameter[DllImport("gdi32.dll")]public static extern bool BitBlt(IntPtr hObject, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hObjectSource, int nXSrc, int nYSrc, int dwRop);
[DllImport("gdi32.dll")]public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int nWidth, int nHeight);
[DllImport("gdi32.dll")]public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
[DllImport("gdi32.dll")]public static extern bool DeleteDC(IntPtr hDC);
[DllImport("gdi32.dll")]public static extern bool DeleteObject(IntPtr hObject);
[DllImport("gdi32.dll")]public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
}/// <
summary>
/// Helper class containing User32 API functions/// <
/summary>
private class User32{[StructLayout(LayoutKind.Sequential)]public struct RECT{public int left;
public int top;
public int right;
public int bottom;
}[DllImport("user32.dll")]public static extern IntPtr GetDesktopWindow();
[DllImport("user32.dll")]public static extern IntPtr GetWindowDC(IntPtr hWnd);
[DllImport("user32.dll")]public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("user32.dll")]public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect);
}}}
活动的Winform窗口截图使用完整的屏幕截图有两种方法, 使用带有Windows图形库的自实现屏幕截图或使用前面提到的类。
要仅从活动窗口中获取屏幕截图, 我们将使用以下类, 该类允许你执行不同类型的屏幕截图。
首先, 不要忘记在类顶部(你将在其中使用方法的地方)添加以下use语句, 以访问必要的方法:
using System.Drawing;
using System.Drawing.Imaging;
现在, 要获取活动窗口的屏幕截图, 请在你的主类中使用以下方法:
/// <
summary>
/// Creates a screenshot of the active winform window./// It uses the ScreenCapture class./// <
/summary>
/// <
param name="filepath">
<
/param>
/// <
param name="filename">
<
/param>
/// <
param name="format">
<
/param>
private void WindowScreenshot(String filepath, String filename, ImageFormat format){ScreenCapture sc = new ScreenCapture();
string fullpath = filepath + "\\" + filename;
sc.CaptureWindowToFile(this.Handle, fullpath, format);
}// Use like :WindowScreenshot(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "window_screenshot.jpg", ImageFormat.Jpeg);
现在另一种方法是使用.NET Graphics类中的CopyFromScreen方法。
使用以下方法无需任何类即可从活动窗口获取屏幕截图:
/// <
summary>
/// Take the screenshot of the active window using the CopyFromScreen method relative to the bounds of the form./// <
/summary>
/// <
param name="filepath">
<
/param>
/// <
param name="filename">
<
/param>
/// <
param name="format">
<
/param>
private void WindowScreenshotWithoutClass(String filepath, String filename, ImageFormat format){Rectangle bounds = this.Bounds;
using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height)){using (Graphics g = Graphics.FromImage(bitmap)){g.CopyFromScreen(new Point(bounds.Left, bounds.Top), Point.Empty, bounds.Size);
}string fullpath = filepath + "\\" + filename;
bitmap.Save(fullpath, format);
}}// Use it like : WindowScreenshotWithoutClass(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "window_screen_noclass.jpg", ImageFormat.Jpeg);
全屏截图使用完整的屏幕截图有两种方法, 使用带有Windows图形库的自实现屏幕截图或使用前面提到的类。
第一种方法采用全屏截图, 我们将使用.NET Graphics类中的CopyFromScreen方法。
首先, 不要忘记在类顶部添加以下use语句来访问必要的方法:
using System.Drawing;
using System.Drawing.Imaging;
现在, 要截取屏幕截图并将其保存在指定目录中, 请使用以下方法:
/// <
summary>
/// Takes a fullscreen screenshot of the monitor and saves the specified file in a directory with custom name./// It expects the Format of the file./// <
/summary>
/// <
param name="filepath">
<
/param>
/// <
param name="filename">
<
/param>
/// <
param name="format">
<
/param>
private void FullScreenshot(String filepath, String filename, ImageFormat format){Rectangle bounds = Screen.GetBounds(Point.Empty);
using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height)){using (Graphics g = Graphics.FromImage(bitmap)){g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
}string fullpath = filepath + "\\" + filename;
bitmap.Save(fullpath, format);
}}// Use it as FullScreenshot(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "screenshot.jpg", ImageFormat.Jpeg);
并使用ScreenCapture类创建屏幕截图, 请使用以下方法:
/// <
summary>
///Creates a screenshot using the ScreenCapture class./// <
/summary>
/// <
param name="filepath">
<
/param>
/// <
param name="filename">
<
/param>
/// <
param name="format">
<
/param>
private void FullScreenshotWithClass(String filepath, String filename, ImageFormat format){ScreenCapture sc = new ScreenCapture();
Image img = sc.CaptureScreen();
string fullpath = filepath + "\\" + filename;
img.Save(fullpath, format);
}// And use it like FullScreenshotWithClass(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "screenshotfull_class.jpg", ImageFormat.Jpeg);
更多信息
- 请记住, 你可以更改扩展名和ImageFormat类型来更改图像的格式。此类支持以下格式:
- ImageFormat.Jpeg
- 图片格式
- ImageFormat.Tiff
- ImageFormat.Icon
- ImageFormat.MemoryBmp
- ImageFormat.Bmp
- ImageFormat.Exif
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