Display a C++ window in a java GUI

Question

Hi,
I've got a java program and a c++ one.
The Java program`s output is a GUI, using swing and awt componants.
THe Cpp program is a 3D engine: OSG, Open Scene Graph., displaying a 3D model in the screne, with interaction : so that the user can move on the scene, thanks to the mouse or keyboard.
Actually the Java is used as a command panel fot the 3Dengine.
I would like to know if i can have the Cpp ouput window (the 3D ouput form the OSG cpp)
in a Java componant > frame or anything : so that I would be able to keep all my software in only one main GUI.

Answer 1

You can create a child native window in a java component. For this do as follows
- extent java.awt.Canvas class with yours, override method addNotify and add some native method for CPP window initialization, g.e. createWindow()
- in your addNotify call createWindow():
public void addNotify() {
    super.addNotify();
    createWindow();
}- add native method nativeWindowResize(int width, int height) to resize CPP Window;
- implement java.awt.event.ComponentListener and in method componentResized call nativeWindowResized:
public void componentResized(java.awt.event.ComponentEvent componentevent) {
    nativeWindowResize(getWidth(), getHeight());
}- override setBounds(int x, int y, int w, int h):
public void setBounds(int x, int y, int w, int h)
    super.setBounds(x, y, w, h);
    nativeWindowResize(getWidth(), getHeight());
}What to do in JNI code (method createWindow and nativeWindowResize):
- get HWND of java.awt.Canvas Object with AWT native interface;
- create your CPP window as a child of Canvas' window;
- in JNI method nativeWindowResize resize your CPP window.
This is very simple task.