C / C++ / MFC Discussion Boards

RobJones10-Sep-01 10:13

10-Sep-01 10:13

Hello,
Sorry for this lengthy posting, I am trying to figure out the best way to parse text. I created a program that pulls the source HTML from a provided URL and dumps it into a text file. I am parsing through the text file then putting the parsed text into CStrings. I was wondering if there is an easier/better/cleaner way to parse text for values? Here is a sample of the code I’m using to parse. Any ideas to make this easier or more efficient would be greatly appreciated.

//This parses the html for the month
		int nMyIndexMoPDT, nFirstIndexMoPDT, nSecondIndexMoPDT;
		nMyIndexMoPDT = strPDT.Find(_T("the time will be..."));
		nFirstIndexMoPDT = strPDT.Find(_T(","), nMyIndexMoPDT);
		nSecondIndexMoPDT = strPDT.Find(_T(","), nFirstIndexMoPDT+1);
		strPDTMo = strPDT.Mid(nFirstIndexMoPDT+1, nSecondIndexMoPDT-nFirstIndexMoPDT-1);
		strPDTMo.TrimLeft(_T(" "));
		strMonthsPDT = strPDTMo.Left(3);
			
		//This parses the html for the Current Time PDT
		//Vaule should look like 00:00:00 after this part
		int nMyIndexPDT, nFirstIndexPDT, nSecondIndexPDT;
		nMyIndexPDT = strPDT.Find(_T("tone"));
		nFirstIndexPDT = strPDT.Find(_T(">"), nMyIndexPDT);
		nSecondIndexPDT = strPDT.Find(_T("<"), nFirstIndexPDT+1);
		strPDT1 = strPDT.Mid(nFirstIndexPDT, nSecondIndexPDT-3-nFirstIndexPDT-1);
		strPDT = strPDT1.Right(8);
		
		//This parses the html for the current day 2 parts
		int nMyIndexPDTDays, nFirstIndexPDTDays, nSecondIndexPDTDays;
		nMyIndexPDTDays = strPDT.Find(_T("At the tone, the time will be..."));
		nFirstIndexPDTDays = strPDT.Find(_T("b"), nMyIndexPDTDays);
		nSecondIndexPDTDays = strPDT.Find(_T("<"), nFirstIndexPDTDays);
		strPDTDays = strPDT.Mid(nFirstIndexPDTDays+3, nSecondIndexPDTDays-nFirstIndexPDTDays-3);
		
		//At this point the string should be "Wednesday, Jul 10, 2001 00:00:00 PDT"	
		//The next bit of code pulls the day out the string should be "10" for example
		int nMyIndexPDTDaysTemp = strPDTDays.Find(_T(","));
		int nFirstIndexPDTDaysTemp = strPDTDays.Find(_T(","));
		int nSecondIndexPDTDaysTemp = strPDTDays.Find(_T(","), nMyIndexPDTDaysTemp+1);
		CString strDaysP1 = strPDTDays.Mid(nFirstIndexPDTDaysTemp+1,
nSecondIndexPDTDaysTemp-nFirstIndexPDTDaysTemp-1);
		CString strDaysP2 = strDaysP1.Right(2);
		iPDTD = atoi(strDaysP2);
	
		//Are the hours 1 or 2 digits? Hours Extraction
		//This part looks at the 00:00:00 and extracts the Left 2 digits
		strPDTHours = strPDT.Left(2);
		if(strPDTHours.Right(1) == _T(":"))
		{
			strPDTHours = strPDT.Left(1);
		}
		int iPDTHours = atoi(strPDTHours); 
		iPDTH = iPDTHours;
	
		//Minutes Extraction
		//This part looks at the 00:00:00 and extracts the middle "00"
		int nMyIndexPDTMins, nFirstIndexPDTMins, nSecondIndexPDTMins;
		nMyIndexPDTMins = strPDT.Find(_T(":"));
		nFirstIndexPDTMins = strPDT.Find(_T(":"), nMyIndexPDTMins);
		nSecondIndexPDTMins = strPDT.Find(_T(":"), nFirstIndexPDTMins+1);
		strPDTMins = strPDT.Mid(nFirstIndexPDTMins+1, nSecondIndexPDTMins-nFirstIndexPDTMins-1);
		int iPDTMins = atoi(strPDTMins);
		iPDTM = iPDTMins;
	
		//Are the Seconds 1 or 2 digits?
		//This part looks at the 00:00:00 and extracts the Right 2 digits
		strPDTSec = strPDT.Right(2);
		if(strPDTSec.Left(1) == _T(":"))
		{
			strPDTSec = strPDT.Right(1);
		}
		int iPDTSec = atoi(strPDTSec); 
		iPDTS = iPDTSec;
		//MessageBox(strPDTHours+":"+strPDTMins+":"+strPDTSec); //Used for testing

By the way, this code works. It just seems inefficient to me. Big Grin | :-D

Thanks for any ideas you may have!!!

Re: Parsing Text.. Beginner Question.

Erik Thompson10-Sep-01 10:17

Erik Thompson

10-Sep-01 10:17

Regular Expressions would be better and possibly more efficent. less code and easier to read. try www.boost.org for a template based regular expression set.

Cheers,
-Erik
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
My thoughts are my own and reflect on no other.

Re: Parsing Text.. Beginner Question.

Nemanja Trifunovic10-Sep-01 10:23

Nemanja Trifunovic

10-Sep-01 10:23

I've worked a lot with boost::RegExp, and it is great as long as you don't work with unicode (a bug in VC 6.0, not in the boost library).

However, I'm not sure, I would reccomend boost to a beginner.

I vote pro drink Beer | [beer]

Re: Parsing Text.. Beginner Question.

RobJones10-Sep-01 11:06

RobJones

10-Sep-01 11:06

Thanks everyone.. I'll take a look at your suggestions, I am pretty new at programming so I'll have to see how hard this looks..

One more question.. Can I do a .TrimLeft(_T"<") on a string and then on the next line do another trim and keep triming until all the usless values are gone?

Thanks,

Rob

Re: Parsing Text.. Beginner Question.

A.R.10-Sep-01 12:46

A.R.

10-Sep-01 12:46

Your last question is related to the features of Regular Expressions, so to give you an idea on how they works, open your HTML in any editor that has the capability of search/replace regular expressions (like CodeWright). Then execute a replace like the next one:

Search For: <[^>]*>
Replace With:

And check the "regular expression" check box, as well as the "replace all" check box. After that, you will be able to judge the advantages of using regular expression parsers.

need help in converting

10-Sep-01 10:09

How can I convert from CString to float?

I use MFC and have an EditBox declaired as CString. And I have an EditBox declaired as float... please help... Confused | :confused:

Re: need help in converting

Erik Thompson10-Sep-01 10:19

Erik Thompson

10-Sep-01 10:19

CString myString = "3.14";
float myFloat = atof((LPCSTR)myString);

Cheers,
-Erik
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
My thoughts are my own and reflect on no other.

Thank you!

10-Sep-01 10:21

Thank you! Smile | :)

Help please

10-Sep-01 9:36

I am in a beginning C++ class and just had a baby, I am finally home but I am two coding projects behind can someone please give me an assist and explain it to me please... here are the two assignments :

page 621 or 667 (3rd edition) starting out with C++ by tony gaddis

write a program that uses a structure to store the following wather information for a particular month:

Total Rainfall
High Temperature
Low Temperature
Average Temperature
The program should have an array of twelve structures to hold weather information for an entire year. When the program runs, it should ask the user to enter data for each month. (the average temp should be calculated). Once the data is entered for all the months, the program should calculate and display the average monthly rainfall, the total rainfall for the year, the highest and lowest tempretures for rthe year (and the monthes they occured in), and the average of all the monthly average temps.

input validation: only temps within the range of -100 and 140 degrees F.

I can you you my code so far if you need it.

The second assignment asks the user to input a sentence at the keyboard. Passs the string to a function using a loop and pointer to inspect all characters in the string untill it finds a null character. the function should then return the charater to main(). The function manin() should print the character count to the screen.

any help would be greatly appreciated.

galenda
Ruby.Mathes@tinker.af.mil
gmathes@mmcable.com

Re: Help please

Christian Graus10-Sep-01 12:46

Christian Graus

10-Sep-01 12:46

Hi - congratulations on the little one. Is it your first ? My wife is cooking our third at the moment.

It would be helpful to see your code, so we can see how far you've got and where you need help. As far as the second program goes, it's simply a case of using cin >> to get the string ( which will be a char array ), passing the address of the first character into the function, using a while loop ( I guess, or you could use strlen to find out the size, but that defeats the purpose of counting it yourself ) to step through the array from that point. You have to use a pointer, so you'd want to pass in a char pointer and use pointer arithmetic to increment it ( pChar++ ) until it equals NULL ( NULL, '\0' or 0, they are synonymous ). I don't see why you'd return the character if it's always NULL, I think you mean the character count. So set an int to zero, increment it in the loop and return that value.

If you post your code for both problems ( I've not addressed the first on the basis you've got a start so you should post the code first ), then I'll be glad to comment further.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: Help please

A.R.10-Sep-01 14:03

A.R.

10-Sep-01 14:03

Hey! congratulations for your third !!!
Is always a bless Smile | :)

Re: Help please

Christian Graus10-Sep-01 14:16

Christian Graus

10-Sep-01 14:16

Thanks. It was not planned, but I'm realy stoked about it.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: Help please

Carlos Antollini10-Sep-01 14:40

Carlos Antollini

10-Sep-01 14:40

Hey Christian, Congratulations, Always is good to read about you.

Cheers!!!
Big Grin | :-D

Carlos Antollini.

Re: Help please

11-Sep-01 3:03

here is the code so far, i am so stuck, this is my third and he was two months premie...
I got the psuedocode from another studend bt do not know what to do, all my teacher will say is read the book and that is no help

//

# Include <iostream.h>
# include <string.h>

struct weather

{
char month[12];
float total_rainfall;
float high_temp;
float low_temp
float average_temp:
};

Void main ()
{
weather year [12]
{"January", 0.0, 0.0, 0.0, 0.0},
{"February", 0.0, 0.0, 0.0, 0.0},
{"March", 0.0, 0.0, 0.0, 0.0},
{"April", 0.0, 0.0, 0.0, 0.0},
{"May", 0.0, 0.0, 0.0, 0.0},
{"June", 0.0, 0.0, 0.0, 0.0},
{"July", 0.0, 0.0, 0.0, 0.0},
{"August", 0.0, 0.0, 0.0, 0.0},
{"September", 0.0, 0.0, 0.0, 0.0},
{"October", 0.0, 0.0, 0.0, 0.0},
{"November", 0.0, 0.0, 0.0, 0.0},
{"December", 0.0, 0.0, 0.0, 0.0},
float total_year rain=0
float accumulated_avgtemp=0
float highest_temp=-100
float lowest_temp=140
char calender[12][10]
};

for (int x = 0; x < 12; x++)
{
cout << "Please enter the following
data for " << month[x]<< ": \n\n";
cout << "High temperature: ";
cin >> month[x].high_temp;
cout << "Low temperature: ";
cin >> month[x].low_temp;

psudocode for the rest so far

Prompt user for data entries for the month of calendar[a]:

Input total_rain
If total_rain is less than zero, prompt user for re-entry and loop back to input.
Add total_rain to accumulated_yearly_rain.

Call Function One (get_temp)
Return new value for high_temp.
Call Function One (get_temp)
Return new value for low_temp.
If high_temp is less than low_temp, prompt user for
re-entry and loop back to first call of Function One.
Calculate average_temp for the month using high_temp and low_temp.
Add average_temp to accumulated_average_temp.
If high_temp is higher than overall_high_temp
then replace overall_high_temp with high_temp.
If low_temp is higher than overall_low_temp
then replace overall_low_temp with low_temp

Output the following:

Average Monthly Rainfall = accumulated_yearly_rain / 12
Yearly High Temp = overall_high_temp
Yearly Low Temp = overall_low_temp
Average Temperature = accumulated_average_temp / 12
Average Total Yearly Rainfall = accumulated_yearly_rain

Begin Function One
(zero arguments, one return)

Define local float temp = 0

Prompt user to input temp.
If temp is not within standard range,
prompt user for re-entry and loop back to input.

Return temp to main.
Confused | :confused:

help please

MS VisionSDK or similar Video Capture tech...

Joshua Guy10-Sep-01 8:19

Joshua Guy

10-Sep-01 8:19

Just wanting some feedback on different video capture techniques. I have used AVICap, VisionSDK, and the DirectShow exaamples to test different way of video capture. All work great, but the problem I have with all of them is that they eat cpu time like crazy. The web cam software I use now is written in Delphi(did not write nor have source) and uses VFW and it only takes about 10-15% cpu time on my PIII600mhz capturing about 20 fps, but all the samples I've tried using the above options take about 40-50% cpu time on the same machine with the same frame rate. Just wondering of any optimizations or opinions on the above mentioned methods.

Thanks for comments,
Joshua

BTW: The web cam software I use now is ConquerCam. Good no nag shareware. Let me know if you know of any better web cam software.

CListCtrl

10-Sep-01 5:13

If you slap a CListCtrl on top of a dialog in the resource view and then you want to add WM_HSCROLL and WM_VSCROLL programatically, how would you do it?
I noticed that you can add the extended styles programmatically, but how would you scroll styles when there is no Create calls needed?

Re: CListCtrl

Joaquín M López Muñoz10-Sep-01 6:14

Joaquín M López Muñoz

10-Sep-01 6:14

ModifyStyle and ModifyExStyle

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

delete makes assertion fail

Hano10-Sep-01 5:06

Hano

10-Sep-01 5:06

In what conditions a delete can make a debug assertion fail
with this message:

_BLOCK_TYPE_IS_VALID(pHead->nBlockUse)

________________________________________________
Those that have really found the meaning, dont find it meaningful

Re: delete makes assertion fail

Joaquín M López Muñoz10-Sep-01 5:57

Joaquín M López Muñoz

10-Sep-01 5:57

Possibly when you call delete twice on the same pointer.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

CEdit - CRichEditCtrl

10-Sep-01 5:05

Could anybody tell me how to handle EN_SETFOCUS in a CRichEditCtrl???
I've tried it in a CEdit and it works fine but when I use it in a CRichEditCtrl it doesn't work.

Thanks in advance,

Re: CEdit - CRichEditCtrl

Joaquín M López Muñoz10-Sep-01 6:10

Joaquín M López Muñoz

10-Sep-01 6:10

It is not your fault but MFC's:
PRB: Rich Edit Control Message Handlers Are Not Called

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: CEdit - CRichEditCtrl

10-Sep-01 6:19

Gracias, ya me habia supuesto que era algún tipo de bug de Microsoft.

Howto Post a file to a webserver ???

10-Sep-01 4:56

Hi...

I have a webserver on which I use a Perl Script to do WebBased file upload.

The script is called upload.pl. If I call the script http://server/cgi-bin/upload.pl is shows 3 EditBoxes...

1. UID
2. Password
3. Path of the file to upload !!!

I want to call the script with a Dialog-Based Application (Visual C++)...

first I tried to simply call the upload-script by
http://server/cgi-bin/upload.pl?uid=xxx&pwd=yyy&file=C:\autoexec.bat&submit=Upload

But this won't work... I sniffed on my Ethernet Card to look what my PC sends to the WebServer !!!

Then I see that the client sends not the FileName c:\autoexec.bat but the DATA of c:\autoexec.bat to the webserver !!!

The upload Script calls a

How could I send the File to the WebServer with Visual C++ (binaries,text) ???

Have anyone an idea ??? or knows sources on the www where I will find a solution ???

Please help...

cu Agent_White

Re: Howto Post a file to a webserver ???

10-Sep-01 20:46

does really nobody have a tip for me Frown | :-(

cu Agent_White

Re: Howto Post a file to a webserver ???

markkuk10-Sep-01 21:31

markkuk

10-Sep-01 21:31

You need to do a HTTP POST operation containing the file data. See the HTML standard to see how the response should be formatted.

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