System menu using java

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C++

Java

Sir
I have added a menu item in system menu and using c++ code using jni and i want to show a dialog box on the click of that menu My code is as follows
DLL Code-

JNIEXPORT void JNICALL Java_native1_NativeAdd_add
  (JNIEnv *env, jclass cls)
{
		
			 hwnd=FindWindowA(NULL,(LPCSTR)"Anand");
			  a=(int)hwnd;
			  printf("a=%d",a);
			 //printf("%d",hwnd); 
			 HMENU sysmenu= ::GetSystemMenu(hwnd,false);
			 //printf("%d",sysmenu);
			 if(sysmenu)
			 {
			 ::InsertMenuA(sysmenu,7,MF_BYPOSITION | MF_STRING,1001,"About ...");
				
			 }
}

I used the following function in c++ dll but it is not worrking any more if any one can help me then please give me the solution asap
Thanks in advance...

LRESULT CALLBACK WindowProcedure (HWND hwnd, //Handle to the window for this function
								  unsigned int uiMsg, //The message
								  WPARAM wParam, //Basically another part of the message
								  LPARAM lParam) //Basically another part of the message
{
	printf("inside window");
	switch (uiMsg) //All messages are int. So we can use a switch statement to handle them.
	{
		//case WM_CLOSE: //WM_CLOSE is defined as a int, this message is sent to our window procedure function when we go to close the window
		//	DestroyWindow (hwnd); //Send a WM_DESTROY message to the message queue for the hWnd handle.
		//	//The message queue is a place where messages go and wait to be sent to this function (From the DispatchMessage(&uMsg) funcion)
		//	break;
		//case WM_DESTROY: //This will be used it WM_DESTROY is our message
		//	PostQuitMessage (0); //Send WM_QUIT to the message queue, this will break out message loop and then exit the application
		//	break;
	    case WM_SYSCOMMAND:
					flag=true;
					printf("%d",flag);
					break;
		case WM_KEYDOWN: //This is used if we press a key
			switch (LOWORD (wParam)) //The actual key is in the lower 16bits of the wParam, so we need to do this
			{
				case VK_RETURN: //If we pressed the Enter/Return key
					//MessageBox (hWnd, "The Enter/Return key was pressed", "Message:", MB_OK);
					break;
				case VK_TAB: //If we pressed the tab key
					//MessageBox(hWnd, "The Tab key was pressed", "Message", MB_OK);
					printf("sir");
					break;
				case 1001:
					flag=true;
					break;
			}
			break;
	}
	return DefWindowProc (hwnd, uiMsg, wParam, lParam); //Handle all the messages that we didn't
}