Mã của KvanTTT hoạt động rất tốt. Tôi đã mở rộng nó một chút để cho phép linh hoạt hơn một chút về định dạng lưu, cũng như khả năng lưu bằng hWnd, .NET Control / Form. Bạn có thể nhận được một bitmap hoặc lưu vào tệp, với một vài tùy chọn.
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace MosaiqPerformanceMonitor {
public enum CaptureMode {
Screen, Window
}
public static class ScreenCapturer {
[DllImport("user32.dll")]
private static extern IntPtr GetForegroundWindow();
[DllImport("user32.dll")]
private static extern IntPtr GetWindowRect(IntPtr hWnd, ref Rect rect);
[StructLayout(LayoutKind.Sequential)]
private struct Rect {
public int Left;
public int Top;
public int Right;
public int Bottom;
}
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern IntPtr GetDesktopWindow();
/// <summary> Capture Active Window, Desktop, Window or Control by hWnd or .NET Contro/Form and save it to a specified file. </summary>
/// <param name="filename">Filename.
/// <para>* If extension is omitted, it's calculated from the type of file</para>
/// <para>* If path is omitted, defaults to %TEMP%</para>
/// <para>* Use %NOW% to put a timestamp in the filename</para></param>
/// <param name="mode">Optional. The default value is CaptureMode.Window.</param>
/// <param name="format">Optional file save mode. Default is PNG</param>
public static void CaptureAndSave(string filename, CaptureMode mode = CaptureMode.Window, ImageFormat format = null) {
ImageSave(filename, format, Capture(mode));
}
/// <summary> Capture a specific window (or control) and save it to a specified file. </summary>
/// <param name="filename">Filename.
/// <para>* If extension is omitted, it's calculated from the type of file</para>
/// <para>* If path is omitted, defaults to %TEMP%</para>
/// <para>* Use %NOW% to put a timestamp in the filename</para></param>
/// <param name="handle">hWnd (handle) of the window to capture</param>
/// <param name="format">Optional file save mode. Default is PNG</param>
public static void CaptureAndSave(string filename, IntPtr handle, ImageFormat format = null) {
ImageSave(filename, format, Capture(handle));
}
/// <summary> Capture a specific window (or control) and save it to a specified file. </summary>
/// <param name="filename">Filename.
/// <para>* If extension is omitted, it's calculated from the type of file</para>
/// <para>* If path is omitted, defaults to %TEMP%</para>
/// <para>* Use %NOW% to put a timestamp in the filename</para></param>
/// <param name="c">Object to capture</param>
/// <param name="format">Optional file save mode. Default is PNG</param>
public static void CaptureAndSave(string filename, Control c, ImageFormat format = null) {
ImageSave(filename, format, Capture(c));
}
/// <summary> Capture the active window (default) or the desktop and return it as a bitmap </summary>
/// <param name="mode">Optional. The default value is CaptureMode.Window.</param>
public static Bitmap Capture(CaptureMode mode = CaptureMode.Window) {
return Capture(mode == CaptureMode.Screen ? GetDesktopWindow() : GetForegroundWindow());
}
/// <summary> Capture a .NET Control, Form, UserControl, etc. </summary>
/// <param name="c">Object to capture</param>
/// <returns> Bitmap of control's area </returns>
public static Bitmap Capture(Control c) {
return Capture(c.Handle);
}
/// <summary> Capture a specific window and return it as a bitmap </summary>
/// <param name="handle">hWnd (handle) of the window to capture</param>
public static Bitmap Capture(IntPtr handle) {
Rectangle bounds;
var rect = new Rect();
GetWindowRect(handle, ref rect);
bounds = new Rectangle(rect.Left, rect.Top, rect.Right - rect.Left, rect.Bottom - rect.Top);
CursorPosition = new Point(Cursor.Position.X - rect.Left, Cursor.Position.Y - rect.Top);
var result = new Bitmap(bounds.Width, bounds.Height);
using (var g = Graphics.FromImage(result))
g.CopyFromScreen(new Point(bounds.Left, bounds.Top), Point.Empty, bounds.Size);
return result;
}
/// <summary> Position of the cursor relative to the start of the capture </summary>
public static Point CursorPosition;
/// <summary> Save an image to a specific file </summary>
/// <param name="filename">Filename.
/// <para>* If extension is omitted, it's calculated from the type of file</para>
/// <para>* If path is omitted, defaults to %TEMP%</para>
/// <para>* Use %NOW% to put a timestamp in the filename</para></param>
/// <param name="format">Optional file save mode. Default is PNG</param>
/// <param name="image">Image to save. Usually a BitMap, but can be any
/// Image.</param>
static void ImageSave(string filename, ImageFormat format, Image image) {
format = format ?? ImageFormat.Png;
if (!filename.Contains("."))
filename = filename.Trim() + "." + format.ToString().ToLower();
if (!filename.Contains(@"\"))
filename = Path.Combine(Environment.GetEnvironmentVariable("TEMP") ?? @"C:\Temp", filename);
filename = filename.Replace("%NOW%", DateTime.Now.ToString("yyyy-MM-dd@hh.mm.ss"));
image.Save(filename, format);
}
}
}