Mike,

thanks for your help. I am one step further, I can now decode the byte array as unicode using this code:

System.setProperty("jna.encoding", "UTF-16LE"); User32 user32 = User32.INSTANCE;

final HWND[] handles = new HWND[500];

user32.EnumWindows(new User32.WNDENUMPROC() { int count; public boolean callback(HWND hWnd, Pointer userData) { System.out.println("Found window " + hWnd + ", total " + ++count); handles[count] = hWnd; return true; } }, null);

for( HWND i : handles) { byte text[] = new byte[1024]; user32.GetWindowModuleFileName(i, text, 1024); String test = Native.toString(text); System.out.println(test); }

But there must be something wrong, because I get like 400 Window handles (which might be ok in Windows), but everytime I get a valid String in my "text" variable, it is the same String:

Here is the first output (window handles):

(...) Found window com.sun.jna.examples.win32.W32API$HWND@10414, total 116 Found window com.sun.jna.examples.win32.W32API$HWND@1040e, total 117 Found window com.sun.jna.examples.win32.W32API$HWND@10412, total 118 Found window com.sun.jna.examples.win32.W32API$HWND@202f2, total 119 Found window com.sun.jna.examples.win32.W32API$HWND@30328, total 120 (...)

Here is the second output (filenames):

(...) C:\Documents and Settings\Administrator\My Documents\IBM Java 50 JDK\bin\javaw.exe C:\Documents and Settings\Administrator\My Documents\IBM Java 50 JDK\bin\javaw.exe C:\Documents and Settings\Administrator\My Documents\IBM Java 50 JDK\bin\javaw.exe C:\Documents and Settings\Administrator\My Documents\IBM Java 50 JDK\bin\javaw.exe C:\Documents and Settings\Administrator\My Documents\IBM Java 50 JDK\bin\javaw.exe C:\Documents and Settings\Administrator\My Documents\IBM Java 50 JDK\bin\javaw.exe C:\Documents and Settings\Administrator\My Documents\IBM Java 50 JDK\bin\javaw.exe (...)

What could that be?

From: Michael Brewer-Davis <mich...@tech4learning.com> To: use...@jna.dev.java.net Date: 23.07.2008 23:24 Subject: Re: [jna-users] Fw: GetWindowModuleFileName() call

Didn't check the JNA example code before responding--the basic idea's still the same, but if you want to use the default example code without adding a char[] variant function, you can:

1) interpret the byte[] as a UTF16 string (be sure your buffer has length 2 * cchFileNameMax) 2) ask JNA to default to ASCII (set "w32.ascii" system property) 3) create an ASCII instance of the User32 library User32 asciiInstance = (User32) Native.loadLibrary("user32", User32.class, ASCII_OPTIONS);

There may be better options someone else can mention.

Michael Brewer-Davis wrote: