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POJava - Window Image
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  1. POJava - Window Image
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    copied!<p>Does anyone know how to capture a screen shot in Java (not it's own screen, but any other window on the desktop and they <strong>don't</strong> necessarily have to be the <strong>active</strong> window) in Windows? There are a number of threads here on this similar subject, but I have yet to find an answer. </p> <p>I've tried using JNA, but became stuck after a few attempts. For example...</p> <pre><code>public class Main { public static void main(String[] args) { Main m = new Main(); List&lt;WindowInfo&gt; list = m.getWindows(); for (int i=0;i&lt;list.size();i++) { WindowInfo info = list.get(i); System.out.println(info.getTitle()); } WindowInfo wi = list.get(0); W32API.HDC hdcSrc = User32.instance.GetWindowDC(wi.getHwnd()); W32API.HDC hdcMemory = Gdi32.instance.CreateCompatibleDC(hdcSrc); //W32API.HBITMAP hBitmapMemory = Gdi32.instance.CreateCompatibleBitmap(hdcSrc, int width, int height); int width = wi.getRect().right - wi.getRect().left; int height = wi.getRect().bottom - wi.getRect().top; W32API.HBITMAP hBitmapMemory = Gdi32.instance.CreateCompatibleBitmap(hdcSrc, width, height); W32API.HANDLE hOld = Gdi32.instance.SelectObject(hdcMemory, hBitmapMemory); Gdi32.instance.BitBlt(hdcMemory, 0, 0, width, height, hdcSrc, width+2, height+2, 0x00CC0020); /* # now how do we convert to a BufferedImage??? */ // clean up Gdi32.instance.SelectObject(hdcMemory, hOld); Gdi32.instance.DeleteDC(hdcMemory); Gdi32.instance.DeleteObject(hBitmapMemory); User32.instance.ReleaseDC(wi.getHwnd(), hdcSrc); } /** * * @return */ private List&lt;WindowInfo&gt; getWindows() { final List&lt;WindowInfo&gt; list = new ArrayList&lt;WindowInfo&gt;(); User32.instance.EnumWindows(new WndEnumProc() { public boolean callback(int hWnd, int lParam) { if (User32.instance.IsWindowVisible(hWnd)) { RECT r = new RECT(); User32.instance.GetWindowRect(hWnd, r); byte[] buffer = new byte[1024]; User32.instance.GetWindowTextA(hWnd, buffer, buffer.length); String title = Native.toString(buffer); if (title!=null&amp;&amp;title.length()&gt;0) { list.add(new WindowInfo(hWnd, r, title)); } } return true; } }, 0); Collections.sort(list, new Comparator&lt;WindowInfo&gt;() { public int compare(WindowInfo o1, WindowInfo o2) { int i1 = (o1.getTitle()!=null&amp;&amp;o1.getTitle().length()&gt;0?o1.getTitle():" ").charAt(0); int i2 = (o2.getTitle()!=null&amp;&amp;o2.getTitle().length()&gt;0?o2.getTitle():" ").charAt(0); return i1 - i2; } }); return list; } } </code></pre> <p>I've also tried the equivalent of "PrintWindow()" API...</p> <pre><code>Graphics g = form.CreateGraphics(); Bitmap bmp = new Bitmap(form.Size.Width, form.Size.Height, g); Graphics memoryGraphics = Graphics.FromImage(bmp); IntPtr dc = memoryGraphics.GetHdc(); bool success = PrintWindow(form.Handle, dc, 0); memoryGraphics.ReleaseHdc(dc); // bmp now contains the screenshot </code></pre> <p>Or do I have to use JNI, or any other tool?</p>
 

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