C / C++ / MFC

Re: how to write a display program or a reader program??

15-Oct-09 2:09

mr bard2 wrote:
i want to do a software to read text data and display the text...

This is a fairly basic question with many samples around, take a look here[^], as a starting point.

David Crow15-Oct-09 3:17

David Crow

15-Oct-09 3:17

Have you looked at CStdioFile and its members?

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: how to write a display program or a reader program??

Rajesh R Subramanian15-Oct-09 3:43

Rajesh R Subramanian

15-Oct-09 3:43

Hi, see here[^]

“Follow your bliss.” – Joseph Campbell

IHTMLDocument2 for Table Par [modified]

NaveenHS15-Oct-09 1:19

15-Oct-09 1:19

Hello Everyone,

This is my 2nd Post regarding the Text extraction from the WebPages.

In my Previous post David Crow suggested me use IHTMLDocument2 interface,
In the code project depository I found this application

Parsing HTML using MSHTML [] by Philip Patrick ..Extracts all the links in the WebPages Using HREF Tag,

Can I use the same application to extract the Text from the Table from the WebPages ?

I searched for Table tag from which I can extract the text, I did not find any information. Can anyone please tell me is it possible to use MSHTML using IHTMLDocument2 interface can I extract the Text from the <table> Tag.

Thanking you,
Naveen HS.

void CTestDlg::OnBgo() 
{
	UpdateData();
	CWaitCursor wait;
	if(m_csFilename.IsEmpty()){
		AfxMessageBox(_T("Please specify the file to parse"));
		return;
	}
	CFile f;

	//let's open file and read it into CString (u can use any buffer to read though
	if (f.Open(m_csFilename, CFile::modeRead|CFile::shareDenyNone)) {
		m_wndLinksList.ResetContent();
		CString csWholeFile;
		f.Read(csWholeFile.GetBuffer(f.GetLength()), f.GetLength());
		csWholeFile.ReleaseBuffer(f.GetLength());
		f.Close();

		//declare our MSHTML variables and create a document
		MSHTML::IHTMLDocument2Ptr pDoc;
		MSHTML::IHTMLDocument3Ptr pDoc3;
		MSHTML::IHTMLElementCollectionPtr pCollection;
		MSHTML::IHTMLElementPtr pElement;

		HRESULT hr = CoCreateInstance(CLSID_HTMLDocument, NULL, CLSCTX_INPROC_SERVER, 
			IID_IHTMLDocument2, (void**)&pDoc);
		
		//put the code into SAFEARRAY and write it into document
		SAFEARRAY* psa = SafeArrayCreateVector(VT_VARIANT, 0, 1);
		VARIANT *param;
		bstr_t bsData = (LPCTSTR)csWholeFile;
		hr = SafeArrayAccessData(psa, (LPVOID*)&param);
		param->vt = VT_BSTR;
		param->bstrVal = (BSTR)bsData;
		
		hr = pDoc->write(psa);
		hr = pDoc->close();
		
		SafeArrayDestroy(psa);

		//I'll use IHTMLDocument3 to retrieve tags. Note it is available only in IE5+
		//If you don't want to use it, u can just run through all tags in HTML
		//(IHTMLDocument2->all property)
		pDoc3 = pDoc;
		
		//display HREF parameter of every link (A tag) in ListBox
		pCollection = pDoc3->getElementsByTagName(L"A");
		for(long i=0; i<pCollection->length; i++){
			pElement = pCollection->item(i, (long)0);
			if(pElement != NULL){
				//second parameter says that you want to get text inside attribute as is
				m_wndLinksList.AddString((LPCTSTR)bstr_t(pElement->getAttribute("href", 2)));
			}
		}
	}
}

modified on Thursday, October 15, 2009 8:30 AM

«_Superman_»15-Oct-09 6:40

«_Superman_»

15-Oct-09 6:40

You could use IHTMLDocument2::get_all[^] method to get an IHTMLElementCollection[^] interface.
You can now iterate through this collection and then use IHTMLElement::get_tagName[^] to check if it is a table.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

NaveenHS16-Oct-09 1:06

16-Oct-09 1:06

Hello Sir,

Thank you very much for the response.

I have added this lines to the above code.

MSHTML::IHTMLDocument2 *pDoc1 = NULL;
MSHTML::IHTMLElementCollection *pColl = NULL;

pColl = pDoc1->get_all(L"table");

int y = pColl->length;
for(int x = 0; x < y ; x++)
{
}

i am getting the following Error :-

error C2664: 'MSHTML::IHTMLDocument2::get_all' : cannot convert parameter 1 from 'const wchar_t [6]' to 'MSHTML::IHTMLElementCollection **'

«_Superman_»16-Oct-09 5:01

«_Superman_»

16-Oct-09 5:01

NaveenHS wrote:
pColl = pDoc1->get_all(L"table");

This is wrong.
get_all will give you all elements and not all tables.
get_all takes the IHTMLElementCollection pointer as the parameter.
As a general rule, all COM calls in C++ will return an HRESULT.
Except maybe AddRef and Release.

So you will have to check the tag name in a loop to see if they are tables.

So the get_all call would look like this -

pDoc1->get_all(&pColl);

I would recommend using ATL here.
Otherwise you will have to remember to call Release for all these pointers.

So my recommended way would look like this -

CComPtr<MSHTML::IHTMLElementCollection> pColl = NULL;
pDoc1->get_all(&pColl);

You can use the IHTMLElementCollection::item[^] method to get an IDispatch pointer to each element in the collection.
This can in turn be QIed to an IHTMLElement[^] or IHTMLDOMNode[^] interface.
Check the methods of the interfaces to identify the table tags that you need.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

NaveenHS19-Oct-09 1:02

19-Oct-09 1:02

Hello Sir,

Thanks a lot for the reply.

I made changes as mentioned by you, but still i am not able to extract the data from the table. can u please tell what change i have to make.

                MSHTML::IHTMLDocument2Ptr pDoc;
		MSHTML::IHTMLDocument3Ptr pDoc3;
		MSHTML::IHTMLElementCollectionPtr pCollection;
		MSHTML::IHTMLElementPtr pElement;

HRESULT hr = CoCreateInstance(CLSID_HTMLDocument, NULL, CLSCTX_INPROC_SERVER, 
			IID_IHTMLDocument2, (void**)&pDoc);

pDoc3 = pDoc;

		pDoc->get_all(&pCollection);

		pCollection = pDoc3->getElementsByTagName(L"table");

		
		for(long i=0; i<pCollection->length; i++){
			pElement = pCollection->item(i, (long)0);
			if(pElement != NULL){
				m_wndLinksList.AddString((LPCTSTR)bstr_t(pElement->getAttribute("table"),10));
			}
		}

Error :- error C2660: 'MSHTML::IHTMLElement::getAttribute' : function does not take 1 arguments

«_Superman_»19-Oct-09 5:32

«_Superman_»

19-Oct-09 5:32

The syntax for getAttribute is not correct.

Do it this way -

CComBSTR name("table");
VARIANT result;
pElement->getAttribute(name, 0, &result);

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

NaveenHS20-Oct-09 2:21

20-Oct-09 2:21

Hello sir,

I added the code , still getting the error.

pDoc->get_all(&pCollection);

		pCollection = pDoc3->getElementsByTagName("table");

		CComBSTR name("table");
		VARIANT result;

		for(long i=0; i<pCollection->length; i++){
			pElement = pCollection->item(i, (long)0);
			if(pElement != NULL){
			
			m_wndLinksList.AddString((LPCTSTR)bstr_t(pElement->getAttribute(name, 0, &result)));

			
			}
		}

I am getting the below error :-
error C2660: 'MSHTML::IHTMLElement::getAttribute' : function does not take 3 arguments

C++

john curtin14-Oct-09 23:46

john curtin

14-Oct-09 23:46

I'm getting an error message with this line of code, int _int tmain (int argc,_TCHAR* ARGV[]) ,the error E2303 says "Type name expected".
Can somebody advise me, please?

Richard MacCutchan15-Oct-09 0:00

15-Oct-09 0:00

john curtin wrote:
int _int tmain (int argc,_TCHAR* ARGV[])

should read int _tmain(int argc, _TCHAR* argv[])

CPallini15-Oct-09 0:06

CPallini

15-Oct-09 0:06

john curtin wrote:
int _int tmain (int argc,_TCHAR* ARGV[])

The bold _int is an alien, remove it.
Smile | :)

Richard MacCutchan15-Oct-09 0:35

15-Oct-09 0:35

CPallini wrote:
The bold _int is an alien

Where do you think it came from? Maybe CSS knows ... Laugh | :laugh:

Tim Craig15-Oct-09 19:06

Tim Craig

15-Oct-09 19:06

Richard MacCutchan wrote:
Maybe CSS knows

Know and CSS in the same sentence, now that's alien. Laugh | :laugh:

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

I/O files

programmer20214-Oct-09 23:26

programmer202

14-Oct-09 23:26

Hello to everyone.

I want to read line by line an input file (leer_datos).

In the input file (leer_datos): If the first character of each line is '|', then I copy the whole line and paste it in an output file (escribir_datos).
In the input file (leer_datos): If the first character isn´t '|' then I go to the next line in the input file (leer_datos).

My code:

#include <stdio.h>;

int main(void)
{

    FILE *leer_datos, *escribir_datos;
    char muestra[50];

	leer_datos = fopen("input_file.txt", "rt"); 
    escribir_datos = fopen("output_file.txt", "wt");

	while ( (!feof(leer_datos)) && (!ferror(leer_datos)) ) 

	{
		muestra = getc(leer_datos) ;
		if (muestra == '|')  
		     {
			  fgets(muestra, sizeof(muestra), leer_datos); 
              fputs(muestra, escribir_datos);
			  fputs("\n", escribir_datos);
		     }
	
   
	}

	if (fclose(leer_datos) != 0)
		printf ("Hay problemas al cerrar el fichero de lectura de datos\n");  

    if (fclose(escribir_datos) != 0)
		printf ("Hay problemas al cerrar el fichero de escritura de datos\n");    

}

...but it gives some errors and I don´t sure about it works fine.
Anyone could help me, please!?.

Re: I/O files

Richard MacCutchan14-Oct-09 23:38