Hi Don,

Yes, the existing Wnd.sendMessageEx() method is not quite convenient, because it expects LPARAM and WPARAM arguments as Java long values. But it's quite possible to send string values using even the current implementation and the following example demonstrates this technique:

    Str string = new Str("String value");
    Pointer stringPtr = new Pointer(string);
 
    Pointer.Void stringHandle = new Pointer.Void();
    stringPtr.castTo(stringHandle);
 
    long lParam = stringHandle.getValue();
    wnd.sendMessageEx(Msg.WM_SETTEXT, 0, lParam);

I undertand that such pointers cast is not obvious enough therefore I have created the following example, which contains the wrappers for SetDlgItemText/GetDlgItemText API functions as well:

import com.jniwrapper.*;
import com.jniwrapper.win32.FunctionName;
import com.jniwrapper.win32.IntPtr;
import com.jniwrapper.win32.Msg;
import com.jniwrapper.win32.process.Process;
import com.jniwrapper.win32.ui.User32;
import com.jniwrapper.win32.ui.Wnd;
 
/**
 * This example demonstrates how to wrap SetDlgItemText, GetDlgItemText and SendMessage API functions.
 *
 * @author Serge Piletsky
 */
public class Sample {
 
    public static final FunctionName FUNCTION_SetDlgItemText = new FunctionName("SetDlgItemText");
    public static final FunctionName FUNCTION_GetDlgItemText = new FunctionName("GetDlgItemText");
 
    public static final FunctionName FUNCTION_SendMessage = new FunctionName("SendMessage");
 
    /**
     * Sends a message to the specified window.
     *
     * @param wnd    window handle
     * @param msg    message
     * @param wParam WPARAM
     * @param lParam LPARAM
     * @return the return value meaning depends on the message.
     */
    public static long sendMessage(Wnd wnd, int msg, Parameter wParam, Parameter lParam) {
        Function sendMessage = User32.getInstance().getFunction(FUNCTION_SendMessage.toString());
        IntPtr result = new IntPtr();
        sendMessage.invoke(result,
                wnd,
                new UInt(msg),
                wParam != null ? wParam : new IntPtr(),
                lParam != null ? lParam : new IntPtr());
        return result.getValue();
    }
 
    /**
     * Sets the title or text of a control in a dialog box.
     *
     * @param wnd       Handle to the dialog box that contains the control
     * @param idDlgItem Specifies the control with a title or text to be set
     * @param string    String that contains the text to be copied to the control
     * @return If the function succeeds, the return value is true
     */
    public static boolean setDlgItemText(Wnd wnd, int idDlgItem, String string) {
        Function sendMessage = User32.getInstance().getFunction(FUNCTION_SetDlgItemText.toString());
        Bool result = new Bool();
        sendMessage.invoke(result,
                wnd,
                new Int(idDlgItem),
                new Pointer(new Str(string)));
        return result.getValue();
    }
 
    /**
     * Returns the title or text associated with a control in a dialog box.
     *
     * @param wnd       Handle to the dialog box that contains the control
     * @param idDlgItem Specifies the control with a title or text to be set
     * @return return value is true
     */
    public static String getDlgItemText(Wnd wnd, int idDlgItem) {
        Function sendMessage = User32.getInstance().getFunction(FUNCTION_GetDlgItemText.toString());
        final int maxCount = 512;
        Bool result = new Bool();
        Str resultString = new Str(maxCount);
        sendMessage.invoke(result,
                wnd,
                new Int(idDlgItem),
                new Pointer(resultString),
                new Int(maxCount));
        return resultString.getValue();
    }
 
    public static void main(String[] args) throws Exception {
        // start Notepad application and wait 2 seconds
        Process notepadProcess = new Process("notepad");
        Thread.sleep(2000);
 
        // find Notepad window
        Wnd notepadWindow = Wnd.findWindowByName("Untitled - Notepad");
 
        // send WM_SETTEXT message to change the caption of Notepad window
        sendMessage(notepadWindow, Msg.WM_SETTEXT, null, new Pointer(new Str("Hello, World!")));
        Thread.sleep(2000);
 
        // send WM_CLOSE message to close the Notepad window
        sendMessage(notepadWindow, Msg.WM_CLOSE, null, null);
 
        notepadProcess.waitFor();
        System.out.println("Done.");
    }
}

Also, we will add these functions to Wnd class in the next version of WinPack.

-Serge