In Java Swing how do you get a Win32 window handle (hwnd) reference to a window?

Question

In Java 1.4 you could use ((SunToolkit) Toolkit.getDefaultToolkit()).getNativeWindowHandleFromComponent() but that was removed.

It looks like you have to use JNI to

Answer 1

This little JNI method accepts a window title and returns the corresponding window handle.

JNIEXPORT jint JNICALL Java_JavaHowTo_getHwnd
     (JNIEnv *env, jclass obj, jstring title){
 HWND hwnd = NULL;
 const char *str = NULL;

 str = (*env)->GetStringUTFChars(env, title, 0);
 hwnd = FindWindow(NULL,str);
 (*env)->ReleaseStringUTFChars(env, title, str);
 return (jint) hwnd;
 }

UPDATE:

With JNA, it's a little bit easier. I made a small example which find the handle and use it to bring the program to front.