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POWin32 File Properties dialog not displaying in Java Swing app via JNI
 

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  1. POWin32 File Properties dialog not displaying in Java Swing app via JNI
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    <p>I have a Java Swing application with a couple of pieces of native functionality added via JNI. One thing this application does is show a tree view of the file system. I was trying to write a little JNI so that, on Windows systems, I could provide a "Properties..." context menu item that displayed the standard file "Properties" dialog from Windows.</p> <p>I scraped the internet for the Win32 code needed to do this, and came up with this:</p> <pre><code>JNIEXPORT jboolean JNICALL Java_com_foobar_showFilePropertiesDialogImpl (JNIEnv *env, jobject obj, jlong hwnd, jstring fileName) { LPITEMIDLIST pidl; LPCITEMIDLIST pidlItem; HRESULT hr; IShellFolder *pFolder; IContextMenu *pContextMenu; CMINVOKECOMMANDINFO cmi; const wchar_t *pszFile; if (!coInitialized) { #ifdef DEBUG MessageBoxW(NULL, L"Initializing COM (should happen just once)...", L"Initializing COM...", MB_OK); #endif CoInitialize(NULL); coInitialized = true; } /* Get the name of the file. */ pszFile = (wchar_t *)env-&gt;GetStringChars(fileName, NULL); if (pszFile==NULL) { /* Exception occurred */ return JNI_FALSE; } hr = SHGetDesktopFolder(&amp;pFolder); if (FAILED(hr)) { env-&gt;ReleaseStringChars(fileName, (const jchar *)pszFile); return JNI_FALSE; } hr = pFolder-&gt;ParseDisplayName(HWND_DESKTOP, NULL, (LPTSTR)pszFile, NULL, &amp;pidl, NULL); pFolder-&gt;Release(); if (FAILED(hr)) { env-&gt;ReleaseStringChars(fileName, (const jchar *)pszFile); return JNI_FALSE; } hr = SHBindToParent(pidl, IID_IShellFolder, (void **)&amp;pFolder, &amp;pidlItem); if (FAILED(hr)) { SHFree(pidl); env-&gt;ReleaseStringChars(fileName, (const jchar *)pszFile); return JNI_FALSE; } hr = pFolder-&gt;GetUIObjectOf(HWND_DESKTOP, 1, (LPCITEMIDLIST *)&amp;pidlItem, IID_IContextMenu, NULL, (void **)&amp;pContextMenu); pFolder-&gt;Release(); if(SUCCEEDED(hr)) { ZeroMemory(&amp;cmi, sizeof(cmi)); cmi.cbSize = sizeof(cmi); if (hwnd&gt;0) { cmi.hwnd = (HWND)hwnd; } cmi.lpVerb = "properties"; cmi.nShow = SW_SHOWNORMAL; hr = pContextMenu-&gt;InvokeCommand(&amp;cmi); #ifdef DEBUG if (FAILED(hr)) { wchar_t msg[2048]; wsprintf(msg, L"InvokeCommand failed: %d - %x", SUCCEEDED(hr), hr); MessageBoxW(NULL, pszFile, msg, MB_OK); } else { MessageBoxW(NULL, L"InvokeCommand successful!", L"InvokeCommand Status", MB_OK); } #endif } pContextMenu-&gt;Release(); SHFree(pidl); env-&gt;ReleaseStringChars(fileName, (const jchar *)pszFile); return JNI_TRUE; } </code></pre> <p>From Java, I run this method from the EDT. Unfortunately, the properties dialog doesn't display <em>if</em> DEBUG is not defined. It seems that if I define DEBUG, the properties dialog will pop up after the "InvokeCommand successful!" MessageBox.</p> <p>Another thing I noticed is, when DEBUG is not defined, I call this method (and the properties dialog is not displayed), it <em>will</em> display later on in the application if I open a different "native" window. For example, I have code that opens the native Delete dialog via SHFileOperation (which works); as soon as I display that dialog, any File properties dialogs that didn't originally display will suddenly appear.</p> <p>It seems as though I'm doing stuff on the wrong thread perhaps. Is the EDT not the thread I want to display native windows from? But I'm confused because again, the delete dialog is working fine.</p>
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    1. USbobby_light
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    1. COProbably has something to do with the windows event queue. This is *not* something you want to do on the event dispatch thread (that's for Swing/AWT consistency, which doesn't encompass unrelated native windows like the properties box).
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      1. UStechnomage
    2. CO`MessageBox()` runs its own message loop, which is probably not interacting correctly with Swing's message processing. Try not to invoke native methods that invoke their own message processing.
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      1. USRemy Lebeau
 

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