/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.snippets;
/*
* Reading and writing to a SAFEARRAY
*
* This example reads from a PostData object in a BeforeNavigate2 event and
* creates a PostData object in a call to Navigate (32-bit win32 only).
* NOTE: This snippet uses internal SWT packages that are
* subject to change without notice.
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
import org.eclipse.swt.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.ole.win32.*;
import org.eclipse.swt.widgets.*;
public class Snippet186 {
static int CodePage = OS.GetACP();
public static void main (String [] args) {
Display display = new Display ();
Shell shell = new Shell (display);
shell.setLayout(new GridLayout(2, false));
final Text text = new Text(shell, SWT.BORDER);
text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
Button go = new Button(shell, SWT.PUSH);
go.setText("Go");
OleFrame oleFrame = new OleFrame(shell, SWT.NONE);
oleFrame.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1));
OleControlSite controlSite;
OleAutomation automation;
try {
controlSite = new OleControlSite(oleFrame, SWT.NONE, "Shell.Explorer");
automation = new OleAutomation(controlSite);
controlSite.doVerb(OLE.OLEIVERB_INPLACEACTIVATE);
} catch (SWTException ex) {
System.out.println("Unable to open activeX control");
display.dispose();
return;
}
final OleAutomation auto = automation;
go.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
String url = text.getText();
int[] rgdispid = auto.getIDsOfNames(new String[]{"Navigate", "URL"});
int dispIdMember = rgdispid[0];
Variant[] rgvarg = new Variant[1];
rgvarg[0] = new Variant(url);
int[] rgdispidNamedArgs = new int[1];
rgdispidNamedArgs[0] = rgdispid[1];
auto.invoke(dispIdMember, rgvarg, rgdispidNamedArgs);
}
});
// Read PostData whenever we navigate to a site that uses it
int BeforeNavigate2 = 0xfa;
controlSite.addEventListener(BeforeNavigate2, new OleListener() {
public void handleEvent(OleEvent event) {
Variant url = event.arguments[1];
Variant postData = event.arguments[4];
if (postData != null) {
System.out.println("PostData = "+readSafeArray(postData)+", URL = "+url.getString());
}
}
});
// Navigate to this web site which uses post data to fill in the text field
// and put the string "hello world" into the text box
text.setText("file://"+Snippet186.class.getResource("Snippet186.html").getFile());
int[] rgdispid = automation.getIDsOfNames(new String[]{"Navigate", "URL", "PostData"});
int dispIdMember = rgdispid[0];
Variant[] rgvarg = new Variant[2];
rgvarg[0] = new Variant(text.getText());
rgvarg[1] = writeSafeArray("hello world");
int[] rgdispidNamedArgs = new int[2];
rgdispidNamedArgs[0] = rgdispid[1];
rgdispidNamedArgs[1] = rgdispid[2];
automation.invoke(dispIdMember, rgvarg, rgdispidNamedArgs);
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
// The following structs are accessed in the readSafeArray and writeSafeArray
// functions:
//
// VARIANT:
// short vt
// short wReserved1
// short wReserved2
// short wReserved3
// int parray
//
// SAFEARRAY:
// short cDims // Count of dimensions in this array
// short fFeatures // Flags used by the SafeArray
// int cbElements // Size of an element of the array
// int cLocks // Number of times the array has been locked without corresponding unlock
// int pvData // Pointer to the data
// SAFEARRAYBOUND[] rgsabound // One bound for each dimension
//
// SAFEARRAYBOUND:
// int cElements // the number of elements in the dimension
// int lLbound // the lower bound of the dimension
static String readSafeArray(Variant variantByRef) {
// Read a safearray that contains data of
// type VT_UI1 (unsigned shorts) which contains
// a text stream.
int pPostData = variantByRef.getByRef();
short[] vt_type = new short[1];
OS.MoveMemory(vt_type, pPostData, 2);
String result = null;
if (vt_type[0] == (short)(OLE.VT_BYREF | OLE.VT_VARIANT)) {
int[] pVariant = new int[1];
OS.MoveMemory(pVariant, pPostData + 8, 4);
vt_type = new short[1];
OS.MoveMemory(vt_type, pVariant[0], 2);
if (vt_type[0] == (short)(OLE.VT_ARRAY | OLE.VT_UI1)) {
int[] pSafearray = new int[1];
OS.MoveMemory(pSafearray, pVariant[0] + 8, 4);
short[] cDims = new short[1];
OS.MoveMemory(cDims, pSafearray[0], 2);
int[] pvData = new int[1];
OS.MoveMemory(pvData, pSafearray[0] + 12, 4);
int safearrayboundOffset = 0;
for (int i = 0; i < cDims[0]; i++) {
int[] cElements = new int[1];
OS.MoveMemory(cElements, pSafearray[0] + 16 + safearrayboundOffset, 4);
safearrayboundOffset += 8;
int cchWideChar = OS.MultiByteToWideChar (CodePage, OS.MB_PRECOMPOSED, pvData[0], -1, null, 0);
if (cchWideChar == 0) return null;
char[] lpWideCharStr = new char [cchWideChar - 1];
OS.MultiByteToWideChar (CodePage, OS.MB_PRECOMPOSED, pvData[0], -1, lpWideCharStr, lpWideCharStr.length);
result = new String(lpWideCharStr);
}
}
}
return result;
}
static Variant writeSafeArray (String string) {
// Create a one dimensional safearray containing two VT_UI1 values
// where VT_UI1 is an unsigned char
// Define cDims, fFeatures and cbElements
short cDims = 1;
short FADF_FIXEDSIZE = 0x10;
short FADF_HAVEVARTYPE = 0x80;
short fFeatures = (short)(FADF_FIXEDSIZE | FADF_HAVEVARTYPE);
int cbElements = 1;
// Create a pointer and copy the data into it
int count = string.length();
char[] chars = new char[count + 1];
string.getChars(0, count, chars, 0);
int cchMultiByte = OS.WideCharToMultiByte(CodePage, 0, chars, -1, null, 0, null, null);
if (cchMultiByte == 0) return null;
int pvData = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte);
OS.WideCharToMultiByte(CodePage, 0, chars, -1, pvData, cchMultiByte, null, null);
int cElements1 = cchMultiByte;
int lLbound1 = 0;
// Create a safearray in memory
// 12 bytes for cDims, fFeatures and cbElements + 4 bytes for pvData + number of dimensions * (size of safearraybound)
int sizeofSafeArray = 12 + 4 + 1*8;
int pSafeArray = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, sizeofSafeArray);
// Copy the data into the safe array
int offset = 0;
OS.MoveMemory(pSafeArray + offset, new short[] {cDims}, 2); offset += 2;
OS.MoveMemory(pSafeArray + offset, new short[] {fFeatures}, 2); offset += 2;
OS.MoveMemory(pSafeArray + offset, new int[] {cbElements}, 4); offset += 4;
OS.MoveMemory(pSafeArray + offset, new int[] {0}, 4); offset += 4;
OS.MoveMemory(pSafeArray + offset, new int[] {pvData}, 4); offset += 4;
OS.MoveMemory(pSafeArray + offset, new int[] {cElements1}, 4); offset += 4;
OS.MoveMemory(pSafeArray + offset, new int[] {lLbound1}, 4); offset += 4;
// Create a variant in memory to hold the safearray
int pVariant = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, Variant.sizeof);
short vt = (short)(OLE.VT_ARRAY | OLE.VT_UI1);
OS.MoveMemory(pVariant, new short[] {vt}, 2);
OS.MoveMemory(pVariant + 8, new int[]{pSafeArray}, 4);
// Create a by ref variant
Variant variantByRef = new Variant(pVariant, (short)(OLE.VT_BYREF | OLE.VT_VARIANT));
return variantByRef;
}
}
