I want to pass list of email address strings from Borland C++ to my C# library. Below my C# side code. I could make call to PrintName() method and it works. Now I want to print email addresses, but if I call PrintEmails() function nothing happens. Could you please suggest how I can pass multiple email addresses to C# lib.
[ComVisible(true)]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
[Guid("4A686AB1-8425-43D9-BD89-B696BB5F6A18")]
public interface ITestConnector
{
void PrintEmails(string[] emails);
void PrintName(string name);
}
[ComVisible(true)]
[ClassInterface(ClassInterfaceType.None)]
[ComDefaultInterface(typeof(ITestConnector))]
[Guid("7D818287-298A-41BF-A224-5EAC9C581BD0")]
public class TestConnector : ITestConnector
{
public void PrintEmails(string[] emails)
{
System.IO.File.WriteAllLines(#"c:\temp\emails.txt", emails);
}
public void PrintName(string name)
{
System.IO.File.WriteAllText(#"c:\temp\name.txt", name);
}
}
I have imported TLB file of above C# library into RAD Studio and my C++ side code is as below.
interface ITestConnector : public IUnknown
{
public:
virtual HRESULT STDMETHODCALLTYPE PrintEmails(LPSAFEARRAY* emails/*[in,out]*/) = 0; // [-1]
virtual HRESULT STDMETHODCALLTYPE PrintName(WideString name/*[in]*/) = 0; // [-1]
};
TTestConnector *connector = new TTestConnector(this);
SAFEARRAYBOUND bounds[] = {{2, 0}}; //Array Contains 2 Elements starting from Index '0'
LPSAFEARRAY pSA = SafeArrayCreate(VT_VARIANT,1,bounds); //Create a one-dimensional SafeArray of variants
long lIndex[1];
VARIANT var;
lIndex[0] = 0; // index of the element being inserted in the array
var.vt = VT_BSTR; // type of the element being inserted
var.bstrVal = ::SysAllocStringLen( L"abc#xyz.com", 11 ); // the value of the element being inserted
HRESULT hr= SafeArrayPutElement(pSA, lIndex, &var); // insert the element
// repeat the insertion for one more element (at index 1)
lIndex[0] = 1;
var.vt = VT_BSTR;
var.bstrVal = ::SysAllocStringLen( L"pqr#xyz.com", 11 );
hr = SafeArrayPutElement(pSA, lIndex, &var);
connector->PrintEmails(pSA);
delete connector;
Below C++ side code worked in my case.
SAFEARRAYBOUND saBound[1];
saBound[0].cElements = nElements;
saBound[0].lLbound = 0;
SAFEARRAY *pSA = SafeArrayCreate(VT_BSTR, 1, saBound);
if (pSA == NULL)
{
return NULL;
}
for (int ix = 0; ix < nElements; ix++)
{
BSTR pData = SysAllocString(elements[ix]);
long rgIndicies[1];
rgIndicies[0] = saBound[0].lLbound + ix;
HRESULT hr = SafeArrayPutElement(pSA, rgIndicies, pData);
_tprintf(TEXT("%d"), hr);
}
I m trying to create new tokenizer by refering book tamingtext (which uses lucene 3.+ api) using new lucene api 7.3, but it is giving me error as mentioned below
java.lang.IllegalStateException: TokenStream contract violation: reset()/close() call missing, reset() called multiple times, or subclass does not call super.reset(). Please see Javadocs of TokenStream class for more information about the correct consuming workflow.
at org.apache.lucene.analysis.Tokenizer$1.read(Tokenizer.java:109)
at java.io.Reader.read(Reader.java:140)
at solr.SentenceTokenizer.fillSentences(SentenceTokenizer.java:43)
at solr.SentenceTokenizer.incrementToken(SentenceTokenizer.java:55)
at solr.NameFilter.fillSpans(NameFilter.java:56)
at solr.NameFilter.incrementToken(NameFilter.java:88)
at spec.solr.NameFilterTest.testNameFilter(NameFilterTest.java:81)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Here is my SentenceTokenizer class
Initializing method, in older api there was super(Reader); but in current api there is no access to Reader class
public SentenceTokenizer(SentenceDetector detector) {
super();
setReader(reader);
this.sentenceDetector = detector;
}
Here is my reset method
#Override
public void reset() throws IOException {
super.reset();
sentenceDetector = null;
}
When i tried to access this method from custom TokenFilter, I m getting above error
public void fillSentences() throws IOException {
char[] c = new char[256];
int size = 0;
StringBuilder stringBuilder = new StringBuilder();
while ((size = input.read(c)) >= 0) {
stringBuilder.append(c, 0, size);
}
String temp = stringBuilder.toString();
inputSentence = temp.toCharArray();
sentenceSpans = sentenceDetector.sentPosDetect(temp);
tokenOffset = 0;
}
#Override
public final boolean incrementToken() throws IOException {
if (sentenceSpans == null) {
//invoking following method
fillSentences();
}
if (tokenOffset == sentenceSpans.length) {
return false;
}
Span sentenceSpan = sentenceSpans[tokenOffset];
clearAttributes();
int start = sentenceSpan.getStart();
int end = sentenceSpan.getEnd();
charTermAttribute.copyBuffer(inputSentence, start, end - start);
positionIncrementAttribute.setPositionIncrement(1);
offsetAttribute.setOffset(start, end);
tokenOffset++;
return true;
}
Here is my custom TokenFilter class
public final class NameFilter extends TokenFilter {
public static final String NE_PREFIX = "NE_";
private final Tokenizer tokenizer;
private final String[] tokenTypeNames;
private final NameFinderME[] nameFinderME;
private final KeywordAttribute keywordAttribute = addAttribute(KeywordAttribute.class);
private final PositionIncrementAttribute positionIncrementAttribute = addAttribute(PositionIncrementAttribute.class);
private final CharTermAttribute charTermAttribute = addAttribute(CharTermAttribute.class);
private final OffsetAttribute offsetAttribute = addAttribute(OffsetAttribute.class);
private String text;
private int baseOffset;
private Span[] spans;
private String[] tokens;
private Span[][] foundNames;
private boolean[][] tokenTypes;
private int spanOffsets = 0;
private final Queue<AttributeSource.State> tokenQueue =
new LinkedList<>();
public NameFilter(TokenStream in, String[] modelNames, NameFinderME[] nameFinderME) {
super(in);
this.tokenizer = SimpleTokenizer.INSTANCE;
this.nameFinderME = nameFinderME;
this.tokenTypeNames = new String[modelNames.length];
for (int i = 0; i < modelNames.length; i++) {
this.tokenTypeNames[i] = NE_PREFIX + modelNames[i];
}
}
//consumes tokens from the upstream tokenizer and buffer them in a
//StringBuilder whose contents will be passed to opennlp
protected boolean fillSpans() throws IOException {
if (!this.input.incrementToken()) return false;
//process the next sentence from the upstream tokenizer
this.text = input.getAttribute(CharTermAttribute.class).toString();
this.baseOffset = this.input.getAttribute(OffsetAttribute.class).startOffset();
this.spans = this.tokenizer.tokenizePos(text);
this.tokens = Span.spansToStrings(spans, text);
this.foundNames = new Span[this.nameFinderME.length][];
for (int i = 0; i < nameFinderME.length; i++) {
this.foundNames[i] = nameFinderME[i].find(tokens);
}
//insize
this.tokenTypes = new boolean[this.tokens.length][this.nameFinderME.length];
for (int i = 0; i < nameFinderME.length; i++) {
Span[] spans = foundNames[i];
for (int j = 0; j < spans.length; j++) {
int start = spans[j].getStart();
int end = spans[j].getEnd();
for (int k = start; k < end; k++) {
this.tokenTypes[k][i] = true;
}
}
}
spanOffsets = 0;
return true;
}
#Override
public boolean incrementToken() throws IOException {
//if there's nothing in the queue
if(tokenQueue.peek()==null){
//no span or spans consumed
if (spans==null||spanOffsets>=spans.length){
if (!fillSpans())return false;
}
if (spanOffsets>=spans.length)return false;
//copy the token and any types
clearAttributes();
keywordAttribute.setKeyword(false);
positionIncrementAttribute.setPositionIncrement(1);
int startOffset = baseOffset +spans[spanOffsets].getStart();
int endOffset = baseOffset+spans[spanOffsets].getEnd();
offsetAttribute.setOffset(startOffset,endOffset);
charTermAttribute.setEmpty()
.append(tokens[spanOffsets]);
//determine of the current token is of a named entity type, if so
//push the current state into the queue and add a token reflecting
// any matching entity types.
boolean [] types = tokenTypes[spanOffsets];
for (int i = 0; i < nameFinderME.length; i++) {
if (types[i]){
keywordAttribute.setKeyword(true);
positionIncrementAttribute.setPositionIncrement(0);
tokenQueue.add(captureState());
positionIncrementAttribute.setPositionIncrement(1);
charTermAttribute.setEmpty().append(tokenTypeNames[i]);
}
}
}
spanOffsets++;
return true;
}
#Override
public void close() throws IOException {
super.close();
reset();
}
#Override
public void reset() throws IOException {
super.reset();
this.spanOffsets = 0;
this.spans = null;
}
#Override
public void end() throws IOException {
super.end();
reset();
}
}
here is my test case for following class
#Test
public void testNameFilter() throws IOException {
Reader in = new StringReader(input);
Tokenizer tokenizer = new SentenceTokenizer( detector);
tokenizer.reset();
NameFilter nameFilter = new NameFilter(tokenizer, modelName, nameFinderMES);
nameFilter.reset();
CharTermAttribute charTermAttribute;
PositionIncrementAttribute positionIncrementAttribute;
OffsetAttribute offsetAttribute;
int pass = 0;
while (pass < 2) {
int pos = 0;
int lastStart = 0;
int lastEnd = 0;
//error occur on below invoke
while (nameFilter.incrementToken()) {
}
}
I have added following changes in my code and it work fine but i m now sure it is correct answer
public SentenceTokenizer(Reader reader,SentenceDetector sentenceDetector) {
super();
this.input =reader;
this.sentenceDetector = sentenceDetector;
}
I am am trying to call a variable in another method to my array.
var Com = the difficulty for the game. But the method below I'm trying to call the var Com, for: var c = Com.GetChoice();
Not sure why I can not figure out how to call it.
public object SetDiff()
{
Console.WriteLine("Enter difficulty #: (1 = Easy, 2 = Normal, 3 = Impossible)");
var diff = Console.ReadLine();
int mode;
int.TryParse(diff, out mode);
if (mode == 1)
{
Console.Clear();
var Com = new Easy();
return Com;
}
if (mode == 2)
{
Console.Clear();
var Com = new Medium();
return Com;
}
if (mode == 3)
{
Console.Clear();
var Com = new Hard();
return Com;
}
else
{
Console.WriteLine("That is not a valid input.");
return SetDiff();
}
} // Apparently you can't set variables in a switch.
public int[] FaceOff(int num)
{
int PlayerWin = 0;
int ComWin = 0;
int Tie = num + 1;
// TODO : Get rid of TIES!
for (int i = 0; i < num; i++)
{
var p = p1.GetChoice();
var c = Com.GetChoice();
You have many different options:
Pass as parameter
public int[] FaceOff(int num, int Com){...}
make a "global" variable
private int Com;
I would also recommend you to learn OOP (Object Orientated Programming) basics.
My main class code
{
ArrayList<Item> items = new ArrayList<Item>();
Scanner file = new Scanner(kk.class.getResourceAsStream("product.txt"));
while (file.hasNextLine()) {
String[] sp = file.nextLine().split(",");
// extract item number, description, price and type
itemNum = Integer.parseInt(sp[0]);
des = sp[1];
price = Integer.parseInt(sp[2]);
Item objt = new Item(itemNum, des, price); // Creating a new object
items.add(objt); // Adding it to the list
}
System.out.println(items);
}
output I am getting
[dada.Item#4a5d4a62, dada.Item#32be8e12, dada.Item#7c6159c4, dada.Item#5b4c92a7, dada.Item#3040c5,
My item class code
private int itemNum = 0;
private String des = "";
private int price = 0;
public Item(int i, String d, int p) {
itemNum = i;
des = d;
price = p;
}
You're printing the Item reference's address instead of the fields inside your Item object. You have print the fields inside each Item object by looping through them.
Replace this line
System.out.println(items);
with
for(Item i : items)
{
System.out.println(i.getItemNum()+" "+i.getDes()+" "+i.getPrice());
}
Change the class so that you could access your private fields
private int itemNum = 0;
private String des = "";
private int price = 0;
public Item(int i, String d, int p) {
itemNum = i;
des = d;
price = p;
}
public void setItemNum(int itemNum) {
this.itemNum = itemNum;
}
public int getItemNum() {
return itemNum;
}
public void setDes(String des) {
this.des = des;
}
public String getDes() {
return des;
}
public void setPrice(int price) {
this.price = price;
}
public int getPrice() {
return price;
}
UPDATE 3-4-15:11IS
As recommended by David modified PInvoke as below, this time I am getting different error "Unhandled exception of type System.ExecutionEngineException occurred in mscorlib.dll"
[DllImport("C:\\Program Files\\DJVULIBRE\\LIBDJVULIBRE.dll", CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
private unsafe static extern int ddjvu_page_render(IntPtr page, ddjvu_render_mode_t mode, ref ddjvu_rect_t pagerect,
ref ddjvu_rect_t renderrect,
IntPtr pixelformat,
uint rowsize,
[Out][MarshalAs(UnmanagedType.LPArray)]byte[] imagebuffer);
Thanks David for your valuable time, I think is close to a fix.
HISTORY
I know there are many questions in this subject but none of them help to resolve the issue I am currently facing.
Below is the API function in C Language
DDJVUAPI int
ddjvu_page_render(ddjvu_page_t *page,
const ddjvu_render_mode_t mode,
const ddjvu_rect_t *pagerect,
const ddjvu_rect_t *renderrect,
const ddjvu_format_t *pixelformat,
unsigned long rowsize,
char *imagebuffer );
Below is the PInvoke signature of C Function added in .NET code
[DllImport("C:\\Program Files\\DJVULIBRE\\LIBDJVULIBRE.dll", CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
private unsafe static extern int ddjvu_page_render(IntPtr page, ddjvu_render_mode_t mode, IntPtr pagerect,
IntPtr renderrect,
IntPtr pixelformat,
ulong rowsize,
[Out][MarshalAs(UnmanagedType.LPArray)]byte[] imagebuffer);
Below is how I am calling this function in the c# code
byte* buffer = (byte *)Memory.Alloc(nSize);
try
{
IntPtr ptr1 = (IntPtr)Memory.Alloc(Marshal.SizeOf(prect));
Marshal.StructureToPtr(prect, ptr1, false);
IntPtr ptr2 = (IntPtr)Memory.Alloc(Marshal.SizeOf(rrect));
Marshal.StructureToPtr(rrect, ptr2, false);
byte[] array = new byte[nSize];
fixed (byte* p = array) Memory.Copy(buffer, p, nSize);
ddjvu_page_render(page, ddjvu_render_mode_t.DDJVU_RENDER_MASKONLY, ptr1, ptr2, fmt, (ulong)stride, array);
}
finally
{
Memory.Free(buffer);
}
call to ddjvu_page_render in above code is throwing "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
Prior to this post I must have tried all the option could find in various blogs.
Appreciate any help, is almost a day I am clueless, your timely help could save my job
UPDATE 3-4-15:7:44IS
This code is using DJVULibre
UPDATE 3-4-15:8:35IS
Here is the code I have in Form Load
ctx = ddjvu_context_create(System.AppDomain.CurrentDomain.FriendlyName);
if (ctx != null)
{
string djFile = "C:\\Users\\rammohan.chavakula\\Documents\\eiasample.djvu";
doc = ddjvu_document_create_by_filename(ctx, djFile, 100);
if (doc != null)
{
while (ddjvu_job_status(ddjvu_document_job(doc)) >= ddjvu_status_t.DDJVU_JOB_OK)
SpinDdjvuMessageLoop(ctx, true);
int pageCount = ddjvu_document_get_pagenum(doc);
mediaboxes = new Rectangle[pageCount];
for (int i = 0; i < pageCount; i++)
{
ddjvu_status_t status;
ddjvu_pageinfo_t info = new ddjvu_pageinfo_t();
while ((status = ddjvu_document_get_pageinfo_imp(doc, i, ref info, (uint)System.Runtime.InteropServices.Marshal.SizeOf(info))) < ddjvu_status_t.DDJVU_JOB_OK)
SpinDdjvuMessageLoop(ctx, true);
if (status != ddjvu_status_t.DDJVU_JOB_OK)
continue;
mediaboxes[i] = new Rectangle(0, 0, info.width / info.dpi,
info.height / info.dpi);
}
}
ddjvu_context_release(ctx);
}
In OnPaint function I have this below code
if (doc == null)
{
base.OnPaint(e);
return;
}
Rectangle pageRc = PageMediabox(1);
Rectangle screen = Transform(pageRc, 1, zoom, rotation, false);
Rectangle full = Transform(PageMediabox(1), 1, zoom, rotation, false);
full.Intersect(screen);
IntPtr page = ddjvu_page_create_by_pageno(doc, 1);
if (page == null )
{
base.OnPaint(e);
return;
}
int rotation4 = (((-rotation / 90) % 4) + 4) % 4;
ddjvu_page_set_rotation(page, (ddjvu_page_rotation_t)rotation4);
while (ddjvu_job_status(ddjvu_page_job(page)) >= ddjvu_status_t.DDJVU_JOB_OK)
SpinDdjvuMessageLoop(ctx, true);
if (ddjvu_job_status(ddjvu_page_job(page)) >= ddjvu_status_t.DDJVU_JOB_FAILED)
{
base.OnPaint(e);
return;
}
IntPtr fmt = ddjvu_format_create(ddjvu_format_style_t.DDJVU_FORMAT_BGR24, 0, (UIntPtr)null);
ddjvu_format_set_row_order(fmt, /* top_to_bottom */1);
ddjvu_rect_t prect = new ddjvu_rect_t(full.X, full.Y, (uint)full.Width, (uint)full.Height);
ddjvu_rect_t rrect = new ddjvu_rect_t(screen.X, 2 * full.Y + screen.Y + full.Height - screen.Height, (uint)screen.Width, (uint)screen.Height);
int stride = ((screen.Width * 3 + 3) / 4) * 4;
//byte tmp;
////ScopedMem<char> bmpData(SAZA(char, stride * (screen.dy + 5)));
//for (int y = 0; y < rrect.h; y++) {
// int step_y = y * SCREEN_WIDTH;
// for (int x=0; x < rrect.w; x++) {
// tmp = (byte)((imagebuf[x + step_y] >> 5) << 5);
// }
//}
int rowsize = mediaboxes[0].Width * 3;
int nSize = rowsize * (mediaboxes[0].Height) * 10;
unsafe
{
byte* buffer = (byte *)Memory.Alloc(nSize);
try
{
IntPtr ptr1 = (IntPtr)Memory.Alloc(Marshal.SizeOf(prect));
Marshal.StructureToPtr(prect, ptr1, false);
IntPtr ptr2 = (IntPtr)Memory.Alloc(Marshal.SizeOf(rrect));
Marshal.StructureToPtr(rrect, ptr2, false);
byte[] array = new byte[nSize];
fixed (byte* p = array) Memory.Copy(buffer, p, nSize);
ddjvu_page_render(page, ddjvu_render_mode_t.DDJVU_RENDER_MASKONLY, ptr1, ptr2, fmt, (ulong)stride, array);
}
finally
{
Memory.Free(buffer);
}
ddjvu_page_render should return arbitrary data of page which is to be rendered in a given rectangle area. Once after that I should be able to create image from arbitrary data & display in the screen
Here's how I would write the p/invoke:
[DllImport(dllname, CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
private static extern int ddjvu_page_render(
[In] IntPtr page,
[In] ddjvu_render_mode_t mode,
[In] ref ddjvu_rect_t pagerect,
[In] ref ddjvu_rect_t renderrect,
[In] ref ddjvu_format_t pixelformat,
[In] uint rowsize,
[Out] byte[] imagebuffer
);
Note that I've stopped using unsafe, and am letting the marshaler handle the structs automatically.
There are quite a few assumptions here that I cannot verify:
The calling convention. It might not be cdecl. The C++ header will would have the definitive answer.
The first parameter is a void* handle type, I presume.
ddjvu_render_mode_t is an enum that you have translated correctly.
The three ref parameters are structs, passed by reference. I cannot check that you have translated them correctly.
Calling this function would be something like this:
byte[] imagebuffer = new byte[nSize];
int retval = ddjvu_page_render(
page,
ddjvu_render_mode_t.DDJVU_RENDER_MASKONLY,
ref prect,
ref rrect,
ref fmt,
(uint)stride,
imagebuffer
);
if (retval != ??)
// handle error
This is quite a broad brush answer. I hope it points you in the right direction. I don't think that all your problems will be solved by this.