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POUsing JNA to get/set application identifier
 

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  1. POUsing JNA to get/set application identifier
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    <p>Following up on <a href="https://stackoverflow.com/questions/1834599/pinning-a-java-application-to-the-windows-7-taskbar">my previous question concerning the Windows 7 taskbar</a>, I would like to diagnose why Windows isn't acknowledging that my application is independent of <code>javaw.exe</code>. I presently have the following JNA code to obtain the <a href="http://msdn.microsoft.com/en-us/library/dd378459%28VS.85%29.aspx" rel="noreferrer"><code>AppUserModelID</code></a>:</p> <pre><code>public class AppIdTest { public static void main(String[] args) { NativeLibrary lib; try { lib = NativeLibrary.getInstance("shell32"); } catch (Error e) { System.err.println("Could not load Shell32 library."); return; } Object[] functionArgs = new Object[1]; String functionName = null; Function function; try { functionArgs[0] = new String("Vendor.MyJavaApplication") .getBytes("UTF-16"); functionName = "GetCurrentProcessExplicitAppUserModelID"; function = lib.getFunction(functionName); // Output the current AppId System.out.println("1: " + function.getString(0)); functionName = "SetCurrentProcessExplicitAppUserModelID"; function = lib.getFunction(functionName); // Set the new AppId int ret = function.invokeInt(functionArgs); if (ret != 0) { Logger.out.error(function.getName() + " returned error code " + ret + "."); } functionName = "GetCurrentProcessExplicitAppUserModelID"; function = lib.getFunction(functionName); // Output the current AppId System.out.println("2: " + function.getString(0)); // Output the current AppID, converted from UTF-16 System.out.println("3: " + new String(function.getByteArray(0, 255), "UTF-16")); } catch (UnsupportedEncodingException e) { System.err.println("System does not support UTF-16 encoding."); } catch (UnsatisfiedLinkError e) { System.err.println(functionName + " was not found in " + lib.getFile().getName() + "."); } } } </code></pre> <p>The output of the application is seemingly gibberish:</p> <pre><code>1: ‹ÿU‹ìƒìL¡¬Ÿv3ʼnEüSV‹uƒ&amp; 2: ‹ÿU‹ìƒìL¡¬Ÿv3ʼnEüSV‹uƒ&amp; 3: ????????????????P??????????? </code></pre> <p>Being aware of the fact that the output may be UTF-16, in (3) I attempted to convert a byte array from UTF-16. In all honesty I don't know if my approach here is right as (a) I don't know the size of a <code>PWSTR</code> and (b) I don't know if <a href="http://msdn.microsoft.com/en-us/library/dd378419%28VS.85%29.aspx" rel="noreferrer"><code>GetCurrentProcessExplicitAppUserModelID</code></a> is indeed returning a byte array or string.</p> <p>I'm aware that JSmooth will run the GUI process in a wrapper which simulates this effect. Launch4j claims to do the same, but doesn't appear to work. I am looking to have the <code>AppUserModelID</code> set <em>regardless of the Java wrapper</em>.</p> <p>What is going wrong here?</p>
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    1. COWhat's the output if you make the format UTF-8?
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      1. USMark Elliot
    2. CO`??U???L???v3?E?SV?u?&...` (it's actually longer, because the byte array is length 255). If I return the byte values, it reveals negative values: `-117 -1 85 -117 -20 -125 -20 76 -95 -84 -97 12 118 51 -59 -119 69 -4 83 86 -117 117 8 -125 38 ...`. It gives me the impression that the function returning something else than a string.
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