jna

I'm trying to add an application-switcher to a bigger project I'm working on. It needs to work on Windows XP/Vista/7/8. I'm using Java 1.7. Below is a sample application I created to demonstrate some of the problems I'm having. I'm very new to JNA. Thanks very much to 'Hovercraft Full of Eels' for this answer (and many others!) which forms the basis for the test application. Here are my questions: Image drawing - The images that I get from the window icons are being drawn in black and white. I modified the code in getImageForWindow from this answer by McDowell (Thanks!). Is there a better way

JNI 技术是双向的，既可以从Java 代码中调用原生函数，也可以从原生函数中直接创建 Java 虚拟机，并调用Java 代码。但是在原生函数中调用java代码要写大量C代码，这对大多数java程序员来说是很头疼的。 使用JNA，我们不用编写C代码就能在原生代码中调用java代码。JNA 可以模拟函数指针，通过函数指针，就可以实现在原生代码中调用Java 函数。 下面直接用代码进行说明： 原生代码定义： //方法定义 LONG StartListenServer(const Alarm_Listen_Param *param); //Alarm_Listen_Param结构体 struct{ IpAddress struIPAdress; MessageCallBack fnMsgCb; void *pUserData; BYTE byProtocolType; BYTE byRes[31]; }Alarm_Listen_Param, *Alarm_Listen_Param; //ip结构体 struct{ char szIP[128]; WORD wPort; BYTE byRes[2]; }IpAddress, *IpAddress; //回调函数声明 typedef BOOL (CALLBACK *MessageCallBack)( LONG iHandle,

I'm experimenting with JNA, and this is the first program I try to run. I copied it from the reference, but, when i run it, he finds 412 windows ... and I'm quite sure I've not that many window opened right now :) Can please someone explain me the behaviour of the program? import com.sun.jna.Pointer; import com.sun.jna.win32.StdCallLibrary.StdCallCallback; import com.sun.jna.Native; import com.sun.jna.win32.StdCallLibrary; public class Main { // Equivalent JNA mappings public interface User32 extends StdCallLibrary { User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class);

I am wrapping a shared library (written in C) with Java using JNA. The shared library is written internally, but that library uses functions from another external library, which again depends another external library. So the situation is something like this: ext1 <- ext2 <- internal I.e. the internal uses external library ext2 which again uses external library ext1. What I have tried is: System.loadLibrary("ext1"); System.loadLibrary("ext2"); NativeLIbrary.loadLibrary("internal",xxx.class); This approach fails with "UnresolvedException" when loading the library "ext2"; the linker complains

I've been searching around trying to find a way to determine if a file is a junction or not, and have not found any satisfactory answers. First thing I tried was: Files.isSymbolicLink(aPath) It detects only symbolic links not the files referred to as junctions in Windows. Also tried the solution proposed here (using JNA library): Stackoverflow question (3249117) , but it never returned true on any of the files I know to be junctions. The only way I've found to determine which files are junctions is the following command run in windows command prompt: DIR /S /A:L On my computer it returns 66

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I use following code to control a windows service from java program public class PostgresService2 { public static void main(String[] args) { try { W32ServiceManager serviceManager = new W32ServiceManager(); serviceManager.open(Winsvc.SERVICE_STOP); W32Service service = serviceManager.openService("DBService", Winsvc.SERVICE_ACCEPT_STOP); service.stopService(); service.close(); } catch (Exception ex) { ex.printStackTrace(); } } } This gives error on windows7 (64bit) machine com.sun.jna.platform.win32.Win32Exception: Access is denied. at com