Unity调用API函数对系统桌面和窗口截图

引入WINAPI函数

using System;
using System.Collections;
using System.Runtime.InteropServices;
using System.Drawing;[DllImport("user32.dll")]private static extern IntPtr GetDC(IntPtr hwnd);[DllImport("user32.dll")]private static extern IntPtr GetWindowRect(IntPtr hWnd, ref Rectangle rect);[DllImport("gdi32.dll")]private static extern IntPtr CreateCompatibleDC(IntPtr hdc);[DllImport("gdi32.dll")]private static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight);[DllImport("gdi32.dll")]private static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);[DllImport("gdi32.dll")]private static extern bool BitBlt(IntPtr hDestDC, int xDest, int yDest, int wDest, int hDest, IntPtr hSrcDC, int xSrc, int ySrc, int rop);const int SRCCOPY = 0x00CC0020;[DllImport("gdi32.dll")]public static extern int GetBitmapBits(IntPtr hbmp, int cbBuffer, byte[] lpvBits);[DllImport("gdi32.dll")]private static extern int DeleteDC(IntPtr hdc);[DllImport("user32.dll")]public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);[DllImport("gdi32.dll")]public static extern bool DeleteObject(IntPtr hObject);[DllImport("user32.dll")]private static extern IntPtr GetDesktopWindow();[DllImport("user32.dll")]private static extern IntPtr GetActiveWindow();

调用WINAPI函数进行截图

  public static Texture2D CaptureWindow(IntPtr hWnd){var hscrdc = GetDC(hWnd);var windowRect = new Rectangle();GetWindowRect(hWnd, ref windowRect);int width = Math.Abs(windowRect.Width - windowRect.X);int height = Math.Abs(windowRect.Height - windowRect.Y); Texture2D texture = new Texture2D(width, height, TextureFormat.RGBA32, false);var hbitmap = CreateCompatibleBitmap(hscrdc, width, height);var hmemdc = CreateCompatibleDC(hscrdc);SelectObject(hmemdc, hbitmap);BitBlt(hmemdc, 0, 0, width, height, hscrdc, 0, 0, SRCCOPY);// 创建一个字节数组来存储像素数据byte[] pixels = new byte[width * height * 4];// 调用 GetBitmapBits 函数，将像素数据存储在字节数组中int result = GetBitmapBits(hbitmap, pixels.Length, pixels);// 检查结果并处理像素数据if (result != 0){// 处理像素数据texture.LoadRawTextureData(pixels);texture.Apply();}else{Debug.LogError("Failed to retrieve bitmap bits.");}DeleteObject(hbitmap);ReleaseDC(hWnd, hscrdc);DeleteDC(hmemdc);return texture;}

使用例子

调用CaptureWindow函数对当前窗口进行截图

   IntPtr hwnd = GetActiveWindow();Texture2D texture = CaptureWindow(hwnd);

调用CaptureWindow函数对桌面进行截图

   IntPtr hwnd = GetDesktopWindow();Texture2D texture = CaptureWindow(hwnd);