Save yourself some pain and use JNA. You will need to download jna.jar and jna-platform.jar for the Win32 API. The pinvoke wiki and MSDN are useful for finding the right system calls. Anyway, here is the code to print the title and process of the currently active window. import static enumeration.EnumerateWindows.Kernel32.*; import static enumeration.EnumerateWindows.Psapi.*; import … Read more
From the source: package jnahelloworldtest; import com.sun.jna.Library; import com.sun.jna.Native; import com.sun.jna.NativeLong; import com.sun.jna.Platform; import com.sun.jna.*; /** Simple example of native library declaration and usage. */ public class Main { public interface simpleDLL extends Library { simpleDLL INSTANCE = (simpleDLL) Native.loadLibrary( (Platform.isWindows() ? “simpleDLL” : “simpleDLLLinuxPort”), simpleDLL.class); // it’s possible to check the platform on which … Read more
JNA is much slower than JNI, but much easier. If performance is not an issue use JNA. Using direct buffers have the advantage that the most critical operations don’t use JNI or JNA and are thus faster. They use intrinsic when means they get turned into single machine code instructions. If Java code is significantly … Read more
If I understood correctly your problem. You can use built in Flex/as3 function to take a screenshot of the entire application or a particular component then convert into bytearray and PngEncoder (or JPGEncoder if you prefer), than save it… Here’s an example: <?xml version=”1.0″ encoding=”utf-8″?> <s:WindowedApplication xmlns:fx=”http://ns.adobe.com/mxml/2009″ xmlns:s=”library://ns.adobe.com/flex/spark” xmlns:mx=”library://ns.adobe.com/flex/mx”> <fx:Script> <![CDATA[ import mx.graphics.codec.PNGEncoder; private function … Read more
OK, so I’ve managed to overcome this issue. First of all – A practical cause to “corrupted size vs. prev_size” is quite simple – memory chunk control structure fields in the adjacent following chunk are being overwritten due to out-of-bounds access by the code. if you allocate x bytes for pointer p but wind up … Read more
The callback is proper – there is no flaw in your code, besides you are using deprecated functions. Consider using this: try { Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()); BufferedImage capture = new Robot().createScreenCapture(screenRect); ImageIO.write(capture, “JPEG”, new File(“printed1.jpg”)); } catch (Exception e) { e.printStackTrace(); }
JNA does not support mapping of c++ classes, so if you’re using c++ library you will need a jni wrapper If you need a lot of memory copying. For example, you call one method which returns you a large byte buffer, you change something in it, then you need to call another method which uses … Read more