Capture d'écran de la fenêtre active?
Je fais une application de capture d'écran et tout va bien. Tout ce que j'ai à faire est de capturer la fenêtre active et de prendre une capture d'écran de cette fenêtre active. Est-ce que quelqu'un sait comment je peux faire ça?
ScreenCapture sc = new ScreenCapture();
// capture entire screen, and save it to a file
Image img = sc.CaptureScreen();
// display image in a Picture control named imageDisplay
this.imageDisplay.Image = img;
// capture this window, and save it
sc.CaptureWindowToFile(this.Handle,"C:\\temp2.gif",ImageFormat.Gif);
http://www.developerfusion.com/code/4630/capture-a-screen-shot/
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);
}
bitmap.Save("test.jpg", ImageFormat.Jpeg);
}
pour capturer l'utilisation actuelle de la fenêtre
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);
}
bitmap.Save("C://test.jpg", ImageFormat.Jpeg);
}
Je suggère la solution suivante pour capturer toute fenêtre active en cours (pas uniquement notre application C #) ou tout l’écran avec la détermination de la position du curseur par rapport au coin supérieur gauche de la fenêtre ou de l’écran, respectivement:
public enum enmScreenCaptureMode
{
Screen,
Window
}
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;
}
public Bitmap Capture(enmScreenCaptureMode screenCaptureMode = enmScreenCaptureMode.Window)
{
Rectangle bounds;
if (screenCaptureMode == enmScreenCaptureMode.Screen)
{
bounds = Screen.GetBounds(Point.Empty);
CursorPosition = Cursor.Position;
}
else
{
var foregroundWindowsHandle = GetForegroundWindow();
var rect = new Rect();
GetWindowRect(foregroundWindowsHandle, 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;
}
public Point CursorPosition
{
get;
protected set;
}
}
Voici un extrait pour capturer le bureau ou la fenêtre active. Il ne fait aucune référence à Windows Forms.
public class ScreenCapture
{
[DllImport("user32.dll")]
private static extern IntPtr GetForegroundWindow();
[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern IntPtr GetDesktopWindow();
[StructLayout(LayoutKind.Sequential)]
private struct Rect
{
public int Left;
public int Top;
public int Right;
public int Bottom;
}
[DllImport("user32.dll")]
private static extern IntPtr GetWindowRect(IntPtr hWnd, ref Rect rect);
public static Image CaptureDesktop()
{
return CaptureWindow(GetDesktopWindow());
}
public static Bitmap CaptureActiveWindow()
{
return CaptureWindow(GetForegroundWindow());
}
public static Bitmap CaptureWindow(IntPtr handle)
{
var rect = new Rect();
GetWindowRect(handle, ref rect);
var bounds = new Rectangle(rect.Left, rect.Top, rect.Right - rect.Left, rect.Bottom - rect.Top);
var result = new Bitmap(bounds.Width, bounds.Height);
using (var graphics = Graphics.FromImage(result))
{
graphics.CopyFromScreen(new Point(bounds.Left, bounds.Top), Point.Empty, bounds.Size);
}
return result;
}
}
Comment capturer la totalité de l'écran:
var image = ScreenCapture.CaptureDesktop();
image.Save(@"C:\temp\snippetsource.jpg", ImageFormat.Jpeg);
Comment capturer la fenêtre active:
var image = ScreenCapture.CaptureActiveWindow();
image.Save(@"C:\temp\snippetsource.jpg", ImageFormat.Jpeg);
Initialement trouvé ici: http://www.snippetsource.net/Snippet/158/capture-screenshot-in-c
Le code de KvanTTT a très bien fonctionné. Je l'ai étendu un peu pour permettre un peu plus de flexibilité sur le format de sauvegarde, ainsi que la possibilité de sauvegarder avec hWnd, .NET Control/Form. Vous pouvez obtenir une image bitmap ou enregistrer dans un fichier, avec quelques options.
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("[email protected]"));
image.Save(filename, format);
}
}
}
Je suppose que vous utilisez Graphics.CopyFromScreen pour obtenir la capture d'écran.
Vous pouvez utiliser P/Invoke à GetForegroundWindow ( puis obtenir sa position et sa taille ) pour déterminer la région à partir de laquelle vous devez copier.
Vous pouvez utiliser le code de cette question: Comment enregistrer une capture d’écran directement dans un fichier sous Windows?
Remplacez simplement WIN32_API.GetDesktopWindow() par la propriété Handle de la fenêtre que vous souhaitez capturer.
Utilisez le code suivant:
// Shot size = screen size
Size shotSize = Screen.PrimaryScreen.Bounds.Size;
// the upper left point in the screen to start shot
// 0,0 to get the shot from upper left point
Point upperScreenPoint = new Point(0, 0);
// the upper left point in the image to put the shot
Point upperDestinationPoint = new Point(0, 0);
// create image to get the shot in it
Bitmap shot = new Bitmap(shotSize.Width, shotSize.Height);
// new Graphics instance
Graphics graphics = Graphics.FromImage(shot);
// get the shot by Graphics class
graphics.CopyFromScreen(upperScreenPoint, upperDestinationPoint, shotSize);
// return the image
pictureBox1.Image = shot;
Si vous souhaitez utiliser du code managé: Cela capturera n'importe quelle fenêtre via ProcessId.
J'ai utilisé ce qui suit pour rendre la fenêtre active.
Microsoft.VisualBasic.Interaction.AppActivate(ProcessId);
Threading.Thread.Sleep(20);
J'ai utilisé l'écran d'impression pour capturer une fenêtre.
SendKeys.SendWait("%{PRTSC}");
Threading.Thread.Sleep(40);
IDataObject objData = Clipboard.GetDataObject();
Un petit ajustement à la méthode void statique ImageSave () vous accordera la possibilité de le sauvegarder. Le crédit va à Microsoft (http://msdn.Microsoft.com/en-us/library/sfezx97z.aspx)
static void ImageSave(string filename, ImageFormat format, Image image, SaveFileDialog saveFileDialog1)
{
saveFileDialog1.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif";
saveFileDialog1.Title = "Enregistrer un image";
saveFileDialog1.ShowDialog();
// If the file name is not an empty string open it for saving.
if (saveFileDialog1.FileName != "")
{
// Saves the Image via a FileStream created by the OpenFile method.
System.IO.FileStream fs =
(System.IO.FileStream)saveFileDialog1.OpenFile();
// Saves the Image in the appropriate ImageFormat based upon the
// File type selected in the dialog box.
// NOTE that the FilterIndex property is one-based.
switch (saveFileDialog1.FilterIndex)
{
case 1:
image.Save(fs,
System.Drawing.Imaging.ImageFormat.Jpeg);
break;
case 2:
image.Save(fs,
System.Drawing.Imaging.ImageFormat.Bmp);
break;
case 3:
image.Save(fs,
System.Drawing.Imaging.ImageFormat.Gif);
break;
}
fs.Close();
}
}
Votre événement button_click devrait être codé comme ceci ...
private void btnScreenShot_Click(object sender, EventArgs e)
{
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
ScreenCapturer.CaptureAndSave(filename, mode, format, saveFileDialog1);
}//
Basé sur la réponse d'ArsenMkrt, mais celle-ci vous permet de capturer un contrôle dans votre formulaire (j'écris par exemple un outil contenant un contrôle WebBrowser et voulant capturer uniquement son affichage). Notez l'utilisation de la méthode PointToScreen:
//Project: WebCapture
//Filename: ScreenshotUtils.cs
//Author: George Birbilis (http://zoomicon.com)
//Version: 20130820
using System.Drawing;
using System.Windows.Forms;
namespace WebCapture
{
public static class ScreenshotUtils
{
public static Rectangle Offseted(this Rectangle r, Point p)
{
r.Offset(p);
return r;
}
public static Bitmap GetScreenshot(this Control c)
{
return GetScreenshot(new Rectangle(c.PointToScreen(Point.Empty), c.Size));
}
public static Bitmap GetScreenshot(Rectangle bounds)
{
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);
return bitmap;
}
public const string DEFAULT_IMAGESAVEFILEDIALOG_TITLE = "Save image";
public const string DEFAULT_IMAGESAVEFILEDIALOG_FILTER = "PNG Image (*.png)|*.png|JPEG Image (*.jpg)|*.jpg|Bitmap Image (*.bmp)|*.bmp|GIF Image (*.gif)|*.gif";
public const string CUSTOMPLACES_COMPUTER = "0AC0837C-BBF8-452A-850D-79D08E667CA7";
public const string CUSTOMPLACES_DESKTOP = "B4BFCC3A-DB2C-424C-B029-7FE99A87C641";
public const string CUSTOMPLACES_DOCUMENTS = "FDD39AD0-238F-46AF-ADB4-6C85480369C7";
public const string CUSTOMPLACES_PICTURES = "33E28130-4E1E-4676-835A-98395C3BC3BB";
public const string CUSTOMPLACES_PUBLICPICTURES = "B6EBFB86-6907-413C-9AF7-4FC2ABF07CC5";
public const string CUSTOMPLACES_RECENT = "AE50C081-EBD2-438A-8655-8A092E34987A";
public static SaveFileDialog GetImageSaveFileDialog(
string title = DEFAULT_IMAGESAVEFILEDIALOG_TITLE,
string filter = DEFAULT_IMAGESAVEFILEDIALOG_FILTER)
{
SaveFileDialog dialog = new SaveFileDialog();
dialog.Title = title;
dialog.Filter = filter;
/* //this seems to throw error on Windows Server 2008 R2, must be for Windows Vista only
dialog.CustomPlaces.Add(CUSTOMPLACES_COMPUTER);
dialog.CustomPlaces.Add(CUSTOMPLACES_DESKTOP);
dialog.CustomPlaces.Add(CUSTOMPLACES_DOCUMENTS);
dialog.CustomPlaces.Add(CUSTOMPLACES_PICTURES);
dialog.CustomPlaces.Add(CUSTOMPLACES_PUBLICPICTURES);
dialog.CustomPlaces.Add(CUSTOMPLACES_RECENT);
*/
return dialog;
}
public static void ShowSaveFileDialog(this Image image, IWin32Window owner = null)
{
using (SaveFileDialog dlg = GetImageSaveFileDialog())
if (dlg.ShowDialog(owner) == DialogResult.OK)
image.Save(dlg.FileName);
}
}
}
Avec l'objet Bitmap, vous pouvez simplement appeler Save on
private void btnCapture_Click(object sender, EventArgs e)
{
webBrowser.GetScreenshot().Save("C://test.jpg", ImageFormat.Jpeg);
}
Ce qui précède suppose que le GC récupérera l'image bitmap, mais il vaut peut-être mieux affecter le résultat de someControl.getScreenshot () à une variable Bitmap, puis supprimer cette variable manuellement à la fin de chaque image, en particulier si vous effectuez souvent cette capture ( dites que vous avez une liste de pages Web que vous voulez charger et enregistrez des captures d'écran):
private void btnCapture_Click(object sender, EventArgs e)
{
Bitmap bitmap = webBrowser.GetScreenshot();
bitmap.ShowSaveFileDialog();
bitmap.Dispose(); //release bitmap resources
}
Mieux encore, vous pouvez utiliser une clause using, qui présente l’avantage supplémentaire de libérer les ressources bitmap même en cas d’exception à l’intérieur du bloc using (enfant):
private void btnCapture_Click(object sender, EventArgs e)
{
using(Bitmap bitmap = webBrowser.GetScreenshot())
bitmap.ShowSaveFileDialog();
//exit from using block will release bitmap resources even if exception occured
}
Mise à jour:
Maintenant, l'outil WebCapture est déployé par ClickOnce ( http://gallery.clipflair.net/WebCapture ) à partir du Web (support Nice également avec autoupdate grâce à ClickOnce) et vous pouvez trouver son code source à l'adresse - https://github.com/Zoomicon/ClipFlair/tree/master/Server/Tools/WebCapture