org.eclipse.swt.internal.ole.win32.IDispatch.java Source code

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Here is the source code for org.eclipse.swt.internal.ole.win32.IDispatch.java

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/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.internal.ole.win32;

import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.win32.*;

public class IDispatch extends IUnknown {

    public IDispatch(long address) {
        super(address);
    }

    public int GetIDsOfNames(GUID riid, String[] rgszNames, int cNames, int lcid, int[] rgDispId) {

        char[] buffer;
        int size = rgszNames.length;

        // create an array to hold the addresses
        long hHeap = OS.GetProcessHeap();
        long ppNames = OS.HeapAlloc(hHeap, OS.HEAP_ZERO_MEMORY, size * C.PTR_SIZEOF);
        long[] memTracker = new long[size];

        try {
            // add the address of each string to the array

            for (int i = 0; i < size; i++) {
                // create a null terminated array of char for each String
                int nameSize = rgszNames[i].length();
                buffer = new char[nameSize + 1];
                rgszNames[i].getChars(0, nameSize, buffer, 0);
                // get the address of the start of the array of char
                long pName = OS.HeapAlloc(hHeap, OS.HEAP_ZERO_MEMORY, buffer.length * 2);
                OS.MoveMemory(pName, buffer, buffer.length * 2);
                // copy the address to the array of addresses
                OS.MoveMemory(ppNames + C.PTR_SIZEOF * i, new long[] { pName }, C.PTR_SIZEOF);
                // keep track of the Global Memory so we can free it
                memTracker[i] = pName;
            }

            return COM.VtblCall(5, address, new GUID(), ppNames, cNames, lcid, rgDispId);

        } finally {
            // free the memory
            for (int i = 0; i < memTracker.length; i++) {
                OS.HeapFree(hHeap, 0, memTracker[i]);
            }
            OS.HeapFree(hHeap, 0, ppNames);
        }
    }

    public int GetTypeInfo(int iTInfo, int lcid, long[] ppTInfo) {
        return COM.VtblCall(4, address, iTInfo, lcid, ppTInfo);
    }

    public int Invoke(int dispIdMember, GUID riid, int lcid, int dwFlags, DISPPARAMS pDispParams, long pVarResult,
            EXCEPINFO pExcepInfo, int[] pArgErr) {
        return COM.VtblCall(6, address, dispIdMember, riid, lcid, dwFlags, pDispParams, pVarResult, pExcepInfo,
                pArgErr);
    }
}