Reading and writing to a SAFEARRAY
/*
* 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.
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.internal.win32.OS;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.ole.win32.OLE;
import org.eclipse.swt.ole.win32.OleAutomation;
import org.eclipse.swt.ole.win32.OleControlSite;
import org.eclipse.swt.ole.win32.OleEvent;
import org.eclipse.swt.ole.win32.OleFrame;
import org.eclipse.swt.ole.win32.OleListener;
import org.eclipse.swt.ole.win32.Variant;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
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) {
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;
}
}
Related examples in the same category
