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- Quelle: https://github.com/oxyplot/oxyplot
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maier_st
2023-09-02 09:24:59 +02:00
commit 9520c1fa4a
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54
Source/Examples/WPF/WpfExamples/ScreenCapture.cs Normal file
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// --------------------------------------------------------------------------------------------------------------------
// <copyright file="ScreenCapture.cs" company="OxyPlot">
// Copyright (c) 2014 OxyPlot contributors
// </copyright>
// --------------------------------------------------------------------------------------------------------------------
namespace WpfExamples
{
using System;
using System.Drawing;
using System.Runtime.InteropServices;
public static class ScreenCapture
{
public static Bitmap Capture(int left, int top, int width, int height)
{
var hDesk = NativeMethods.GetDesktopWindow();
var hSrce = NativeMethods.GetWindowDC(hDesk);
var hDest = NativeMethods.CreateCompatibleDC(hSrce);
var hBmp = NativeMethods.CreateCompatibleBitmap(hSrce, width, height);
var hOldBmp = NativeMethods.SelectObject(hDest, hBmp);
NativeMethods.BitBlt(hDest, 0, 0, width, height, hSrce, left, top, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt);
var bmp = Image.FromHbitmap(hBmp);
NativeMethods.SelectObject(hDest, hOldBmp);
NativeMethods.DeleteObject(hBmp);
NativeMethods.DeleteDC(hDest);
NativeMethods.ReleaseDC(hDesk, hSrce);
return bmp;
}
private static class NativeMethods
{
[DllImport("gdi32.dll")]
public static extern bool BitBlt(IntPtr hdcDest, int xDest, int yDest, int wDest, int hDest, IntPtr hdcSource, int xSrc, int ySrc, CopyPixelOperation rop);
[DllImport("user32.dll")]
public static extern bool ReleaseDC(IntPtr hWnd, IntPtr hDc);
[DllImport("gdi32.dll")]
public static extern bool DeleteDC(IntPtr hDc);
[DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hDc);
[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 IntPtr SelectObject(IntPtr hdc, IntPtr bmp);
[DllImport("user32.dll")]
public static extern IntPtr GetDesktopWindow();
[DllImport("user32.dll")]
public static extern IntPtr GetWindowDC(IntPtr ptr);
}
}
}