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[Snippet] Capture Window Screenshot

Posts 1–3 of 3 · Page 1 of 1

Here's my method of taking a screenshot of a window. Not the most efficient way to do it, but hey, it works.

Required namespaces:

Code:

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Threading;

Required external methods:

Code:

        [DllImport("User32.dll")]
        public static extern Int32 SetForegroundWindow(int hWnd);

        [DllImport("user32.dll")]
        static extern bool GetWindowRect(int hwnd, out Rectangle lpRect);

Code:

Code:

        Image CaptureWindowScreenshot(string processName, int processInstanceIndex)
        {
            int processMainWindowHandle = Process.GetProcessesByName(processName)[processInstanceIndex].MainWindowHandle.ToInt32();
            SetForegroundWindow(processMainWindowHandle);
            Thread.Sleep(500);
            Rectangle rectangle = new Rectangle();
            GetWindowRect(processMainWindowHandle, out rectangle);
            Image windowScreenshot = (Image)new Bitmap(rectangle.Width, rectangle.Height);
            using (Graphics graphics = Graphics.FromImage(windowScreenshot))
            {
                //graphics.CompositingMode = CompositingMode.SourceCopy;
                //graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
                //graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
                //graphics.CompositingQuality = CompositingQuality.HighQuality;
                //graphics.SmoothingMode = SmoothingMode.AntiAlias;
                graphics.CopyFromScreen(rectangle.Location, rectangle.Location, rectangle.Size);
            }
            return windowScreenshot;
        }

Usage:

Code:

            Image windowScreenshot;
            try
            {
                windowScreenshot = CaptureWindowScreenshot("processName", 0);
                windowScreenshot.Save("windowScreenshot.png");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

The 2 sources I trust most when it comes to Windows(R) and API declarations:

pinvoke for GetWindowRect: http://www.pinvoke.net/default.aspx/....getwindowrect

<DllImport("user32.dll")> _
Private Shared Function GetWindowRect(ByVal hWnd As HandleRef, ByRef lpRect As RECT) As Boolean
End Function

Notes:
The Win32 RECT is not binary compatible with System.Drawing.Rectangle.

msdn for GetWindowRect(): http://msdn.microsof*****m/en-us/libr...=vs.85%29.aspx

In this, do NOT use System.Drawing.Rectangle as the type for rect. If you do this, the Rectange.Width and Rectangle.Height properties get populated, instead of Rectangle.Right and Rectangle.Bottom.

Tijaytas
1/10/2011

the values for .Right/Width and .Bottom/Height will be wrong in lpRect. Use Win32.RECT instead.
^^unless the form is at 0,0

The region/image returned will likely be too large and contain more than just the window. ?

This would be a way better method, you dont even have to use Pinvoke.

Code:

  using System.Drawing.Imaging;

        private static Bitmap BitmapScreenshot;
        private static Graphics gfx;
        void capScreen()
        {
            BitmapScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);
            gfx = Graphics.FromImage(BitmapScreenshot);
            gf*****pyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size,
                CopyPixelOperation.SourceCopy);
            BitmapScreenshot.Save("path", ImageFormat.Png);
            //pictureBox1.Image = BitmapScreenshot;
            //pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
        }

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Home › Forum › Programming › C# Programming › [Snippet] Capture Window Screenshot

[Snippet] Capture Window Screenshot

Posts 1–3 of 3 · Page 1 of 1

[Snippet] Capture Window Screenshot

Here's my method of taking a screenshot of a window. Not the most efficient way to do it, but hey, it works.

Required namespaces:

Code:

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Threading;

Required external methods:

Code:

        [DllImport("User32.dll")]
        public static extern Int32 SetForegroundWindow(int hWnd);

        [DllImport("user32.dll")]
        static extern bool GetWindowRect(int hwnd, out Rectangle lpRect);

Code:

Code:

        Image CaptureWindowScreenshot(string processName, int processInstanceIndex)
        {
            int processMainWindowHandle = Process.GetProcessesByName(processName)[processInstanceIndex].MainWindowHandle.ToInt32();
            SetForegroundWindow(processMainWindowHandle);
            Thread.Sleep(500);
            Rectangle rectangle = new Rectangle();
            GetWindowRect(processMainWindowHandle, out rectangle);
            Image windowScreenshot = (Image)new Bitmap(rectangle.Width, rectangle.Height);
            using (Graphics graphics = Graphics.FromImage(windowScreenshot))
            {
                //graphics.CompositingMode = CompositingMode.SourceCopy;
                //graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
                //graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
                //graphics.CompositingQuality = CompositingQuality.HighQuality;
                //graphics.SmoothingMode = SmoothingMode.AntiAlias;
                graphics.CopyFromScreen(rectangle.Location, rectangle.Location, rectangle.Size);
            }
            return windowScreenshot;
        }

Usage:

Code:

            Image windowScreenshot;
            try
            {
                windowScreenshot = CaptureWindowScreenshot("processName", 0);
                windowScreenshot.Save("windowScreenshot.png");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

The 2 sources I trust most when it comes to Windows(R) and API declarations:

pinvoke for GetWindowRect: http://www.pinvoke.net/default.aspx/....getwindowrect

msdn for GetWindowRect(): http://msdn.microsof*****m/en-us/libr...=vs.85%29.aspx

This would be a way better method, you dont even have to use Pinvoke.

Code:

  using System.Drawing.Imaging;

        private static Bitmap BitmapScreenshot;
        private static Graphics gfx;
        void capScreen()
        {
            BitmapScreenshot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);
            gfx = Graphics.FromImage(BitmapScreenshot);
            gf*****pyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size,
                CopyPixelOperation.SourceCopy);
            BitmapScreenshot.Save("path", ImageFormat.Png);
            //pictureBox1.Image = BitmapScreenshot;
            //pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
        }

Posts 1–3 of 3 · Page 1 of 1

Post a Reply

Similar Threads

Windows 7 Build 7127 RTM-Branch 100+ ScreenshotsBy EndRiT in General
11Last post 17y ago
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4Last post 13y ago
How to take a screenshot (windows only)By thespartan in Combat Arms Discussions
5Last post 16y ago
[Tut][Visual Basic][Snippet][C&P] Resizing a Window to a photosizeBy CoderNever in Visual Basic Programming
4Last post 16y ago
WarrocK "capture the moment" screenshotsBy reaper in WarRock Discussions
30Last post 16y ago

Tags for this Thread

#c-sharp #coding #programming #screenshot #screenshot capture #window capture #window screenshot