[英]JNA screenshot game
需要制作一些游戲的截圖。 找到了這個 JNA 代碼,但是當我嘗試執行 screen 時,我只會得到黑屏。 當我嘗試對某些程序(例如 WordPad 或 smth)進行屏幕顯示時,它運行良好。 我在 JNA 方面也很糟糕,我想向您尋求幫助。 有可能完成這個任務嗎?
public class Paint extends JFrame {
public BufferedImage capture(HWND hWnd) throws IOException {
String gettime = Gettime.screentime();
HDC hdcWindow = User32.INSTANCE.GetDC(hWnd);
HDC hdcMemDC = GDI32.INSTANCE.CreateCompatibleDC(hdcWindow);
RECT bounds = new RECT();
User32Extra.INSTANCE.GetClientRect(hWnd, bounds);
int width = bounds.right - bounds.left;
int height = bounds.bottom - bounds.top;
HBITMAP hBitmap = GDI32.INSTANCE.CreateCompatibleBitmap(hdcWindow, width, height);
HANDLE hOld = GDI32.INSTANCE.SelectObject(hdcMemDC, hBitmap);
GDI32Extra.INSTANCE.BitBlt(hdcMemDC, 0, 0, width, height, hdcWindow, 0, 0, WinGDIExtra.SRCCOPY);
GDI32.INSTANCE.SelectObject(hdcMemDC, hOld);
GDI32.INSTANCE.DeleteDC(hdcMemDC);
BITMAPINFO bmi = new BITMAPINFO();
bmi.bmiHeader.biWidth = width;
bmi.bmiHeader.biHeight = -height;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = WinGDI.BI_RGB;
Memory buffer = new Memory(width * height * 4);
GDI32.INSTANCE.GetDIBits(hdcWindow, hBitmap, 0, height, buffer, bmi, WinGDI.DIB_RGB_COLORS);
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
image.setRGB(0, 0, width, height, buffer.getIntArray(0, width * height), 0, width);
GDI32.INSTANCE.DeleteObject(hBitmap);
User32.INSTANCE.ReleaseDC(hWnd, hdcWindow);
File outputfile = new File("C:\\image" +gettime+ ".jpg");
ImageIO.write(image, "jpg", outputfile);
return image;
}
public static void main(String[] args) throws IOException {
new Paint();
}
BufferedImage image;
public Paint() throws IOException {
HWND hWnd = User32.INSTANCE.FindWindow(null, "some game");
this.image = capture(hWnd);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
setExtendedState(MAXIMIZED_BOTH);
setVisible(true);
}
@Override
public void paint(Graphics g) {
super.paint(g);
g.drawImage(image, 20, 40, null);
}
}
除了與平台無關之外,使用 JNA 截取屏幕截圖聽起來非常復雜。 Java 具有使用Robot
類截取屏幕截圖的內置功能:
import java.awt.Robot;
Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
BufferedImage capture = new Robot().createScreenCapture(screenRect);
ImageIO.write(capture, "png", new File("./screenshot.png"));
通過調整screenRect
您還可以截取屏幕的一部分。
GDI32Util.getScreenshot(HWND hwnd)
jna 中已經提供了方法。
但是我的情況和你一樣....游戲畫面是黑的...沒什么...
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