C / C++ / MFC Discussion Boards

Re: generate random ip addresses

toxcct20-Apr-04 22:17

toxcct

20-Apr-04 22:17

if you need it into a bind() call, use ADDR_ANY.

TOXCCT >>> GEII power

Re: generate random ip addresses

Paul Ranson21-Apr-04 9:29

Paul Ranson

21-Apr-04 9:29

I think I'd want to know why.

Is there a legitimate reason for doing this?

Paul

fetching selected text

TFB20-Apr-04 12:22

TFB

20-Apr-04 12:22

hello everybody... using vc6/MFC how can i grab highlighted (selected) text from the current screen? Sorta like firing up a spell checker from the task bar to fetch selected word(s). All helpful suggestions appreciated! Thanks!

tom

What does this line of code really do?

Redbehelit20-Apr-04 10:22

Redbehelit

20-Apr-04 10:22

This is from the PushSource filter example for DirectShow:

int cbFileHeader = sizeof(BITMAPFILEHEADER);

// Store the size of the BITMAPINFO
BITMAPFILEHEADER *pBm = (BITMAPFILEHEADER*)m_pFile;
m_cbBitmapInfo = pBm->bfOffBits - cbFileHeader;

I'm not quite sure why "bfOffbits - cbFileHeader" is done.. bfOffbits tells you where the actual picture information starts right? So if you subtracted that offset by the header wouldn't you end up with 0?

Re: What does this line of code really do?

David Crow20-Apr-04 10:41

David Crow

20-Apr-04 10:41

When you set a breakpoint on the m_cbBitmapInfo = pBm->bfOffBits - cbFileHeader statement, what are the values of the three variables? In some test code that I had lying around, the value of bfOffBits was 54, so subtracting 14 from that yielded 40.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: What does this line of code really do?

axid3j1al20-Apr-04 17:22

axid3j1al

20-Apr-04 17:22

Because an image is comprised of the following

a header and then the bitmap info

i.e.

a BITMAPFILEHEADER
a BITMAPINFO
then data in 3 tuples RGB RGB RGB RGB etc (for 24 bit)

So the offset must be the addition of the sizes of the header and the info structure.

Regards,

Axe

Re: What does this line of code really do?

Mike Dimmick21-Apr-04 1:02

Mike Dimmick

21-Apr-04 1:02

The BITMAPINFO consists of a BITMAPINFOHEADER followed by a number of RGBQUAD structures. bfOffBits tells you where in the image the actual image bits start.

The line is computing how big the BITMAPINFO is - the size of the BITMAPINFOHEADER plus the size of the colour table.

The actual layout of a bitmap file is:

BITMAPFILEHEADER
BITMAPINFOHEADER
One RGBQUAD for every colour in the colour table
Bitmap bits

Stability. What an interesting concept. -- Chris Maunder

Sorting contents of CObList array

Still learning how to code20-Apr-04 10:04

Still learning how to code

20-Apr-04 10:04

Hi, I want to sort the contents of a CObList which contains CString objects. Being more experienced in C rather than C++, I immediately thought that qsort() would be the way to go.
However, I now realise that I don't know how to organise the compare routine, as I assume that it is supplied with POSITION elements, but don't know how to access the array from within the routine to compare the CStrings. Is qsort() the way to go with CObList, or is there a better way ? If qsort() is the way, how do I access the CStrings ? Thanks in advance !

Doug

Re: Sorting contents of CObList array

David Crow20-Apr-04 10:23

David Crow

20-Apr-04 10:23

See this article.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Cast/Conversation

Irish_GUI20-Apr-04 10:02

Irish_GUI

20-Apr-04 10:02

I have an IP Address in CString format

i need it in the BYTE format below.

//BYTE localIp[] = {127,0,0,1};

could anyone show me how to do this?

Thanks

Re: Cast/Conversation

David Crow20-Apr-04 10:45

David Crow

20-Apr-04 10:45

CString str("127.0.0.1");
struct in_addr ia;
ia.S_addr = inet_addr(str);
// now look at the four members of ia.S_un_b

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Cast/Conversation

Irish_GUI20-Apr-04 10:55

Irish_GUI

20-Apr-04 10:55

Hey,
i am familar with that
its a cstring to a byte[] im looking to do

Re: Cast/Conversation

toxcct20-Apr-04 10:59

toxcct

20-Apr-04 10:59

ooops, sory, i didn't see either it was a CString... (and i didn't see David's posts 'cause i was writing mine).

well, by passing it to the function, just cast it before with the (LPCTSTR) operator defined in CString.

TOXCCT >>> GEII power

Re: Cast/Conversation

toxcct20-Apr-04 10:58

toxcct

20-Apr-04 10:58

maybe a standard fonction does this (inet_addr() i think, but i don't remember), the folowing works fine, even if it can seem "heavy" :

<font style="color:blue;">#include</font> <stdlib.h>    <font style="color:green;">// atoi()</font>
<font style="color:blue;">#include</font> <ctype.h>     <font style="color:green;">// isdigit()</font>
<font style="color:blue;">#include</font> <string.h>    <font style="color:green;">// strlen()</font>
 
<font style="color:blue;">enum </font>IPValidate {
    IP_ERR = 0,
    IP_OK  = 1
};

 
<font style="color:blue;">int</font> str2bytesIPAddr (<font style="color:blue;">char </font>pcDestTab[], <font style="color:blue;">const char</font>* pcIPAddr) {
    <font style="color:green;">// An IP address is between 0.0.0.0 and 255.255.255.255
</font>
    <font style="color:blue;">int </font>iCptCharIntoIPAddr = 0;
    <font style="color:blue;">int </font>iCptCharIntoByte = 0;
    <font style="color:blue;">int </font>iResult = IP_OK;
    <font style="color:blue;">short </font>sNbBytes = 0;
    <font style="color:blue;">char </font>pstrByte[16];<font style="color:green;">	// To prevent argument size error
</font> 
    <font style="color:blue;">if </font>(strlen(pcIPAddr) > 15) {<font style="color:green;">// the max length of an IP address can't exceed 15 caracters
</font>         iResult = IP_ERR;
    }
    <font style="color:blue;">else </font>{
        <font style="color:blue;">do </font>{
            <font style="color:blue;">if </font>(isdigit(pcIPAddr[iCptCharIntoIPAddr])) {
                <font style="color:green;">// A byte of an IP address mustn't begin with a '0', except if '0' is alone</font>
                <font style="color:blue;">if </font>((iCptCharIntoByte == 0) && (pcIPAddr[iCptCharIntoIPAddr] == '0') && (isdigit(pcIPAddr[iCptCharIntoIPAddr+1]))) {
                    iResult = IP_ERR;
                }
                <font style="color:blue;">else </font>{
                    pstrByte[iCptCharIntoByte] = pcIPAddr[iCptCharIntoIPAddr];
                    iCptCharIntoIPAddr++;
                    iCptCharIntoByte++;
                }
            }
            <font style="color:blue;">else </font>{
                <font style="color:blue;">if </font>(pcIPAddr[iCptCharIntoIPAddr] == '.') {
                    <font style="color:green;">// If we are at the end of a byte
</font>
                    pstrByte[iCptCharIntoByte] = '\0';
                    iCptCharIntoByte = 0;
                    iCptCharIntoIPAddr++;
                    pcDestTab[sNbBytes] = atoi(pstrByte);
                    sNbBytes++;
                    <font style="color:blue;">if </font>((atoi(pstrByte) > 255) || (atoi(pstrByte) < 0)) {
                        <font style="color:green;">// Given that we are on 8 bits, the value must be into [0; 255]</font>
                        iResult = IP_ERR;
                    }
                }
                <font style="color:blue;">else </font>{
                    <font style="color:green;">// Any character different from a digit or a dot ('.')</font>
                    iResult = IP_ERR;
                }
            }
        } <font style="color:blue;">while </font>((pcIPAddr[iCptCharIntoIPAddr] != '\0') && (sNbBytes <= 3) && (iResult == IP_OK));
        <font style="color:blue;">if </font>((pcIPAddr[iCptCharIntoIPAddr] == '\0') && (sNbBytes <= 3) && (iResult == IP_OK)) {
            pstrByte[iCptCharIntoByte] = '\0';
            pcDestTab[sNbBytes] = atoi(pstrByte);
            sNbBytes++;
            <font style="color:blue;">if </font>((atoi(pstrByte) > 255) || (atoi(pstrByte) < 0)) {
                iResult = IP_ERR;
            }
        }
        <font style="color:green;">// IP Address must contain 4 bytes
</font>
        <font style="color:blue;">if </font>(sNbBytes != 4) {
            iResult = IP_ERR;
        }
    }
    <font style="color:blue;">return </font>iResult;
}

TOXCCT >>> GEII power

Re: Cast/Conversation

Irish_GUI20-Apr-04 11:10

Irish_GUI

20-Apr-04 11:10

cheers guys
tis working

struct in_addr ia;
ia.s_addr = inet_addr(strAdapterInfo);

BYTE localIp[3];

localIp[0] = ia.S_un.S_un_b.s_b1;
localIp[1] = ia.S_un.S_un_b.s_b2;
localIp[2] = ia.S_un.S_un_b.s_b3;
localIp[3] = ia.S_un.S_un_b.s_b4;

Thanks again

Re: Cast/Conversation

toxcct21-Apr-04 5:10

toxcct

21-Apr-04 5:10

i forgot to say (if it was interresting you) that it was previously a isIPAddr() that i added two lines (twice the following : pcDestTab[sNbBytes] = atoi(pstrByte);).
i hope that can be helpful to understand the way an IP Address is analysed, and so on.

TOXCCT >>> GEII power

Re: Cast/Conversation

Anonymous20-Apr-04 21:22

Anonymous

20-Apr-04 21:22

Hi

I Hope this will work

1.

CString str = "127,0,0,1";
int length = str .GetLength();
BYTE localIp[length] ;
memcpy(localIp,str,length);

or do it

for(int i = 0;i

Re: Cast/Conversation

toxcct20-Apr-04 22:14

toxcct

20-Apr-04 22:14

ah ah ahh,
do you just know what is an IP ?

what you are suggesting will do so : ['1', '2', '7', '.', '0', '.', '.', '1']
that's not what we want.
a coded IP Address is coded on 4 bytes, which represent each blocks of values.
it will be either : [0x7F, 0x00, 0x00, 0x01].

TOXCCT >>> GEII power

Structure Initialization

aman200620-Apr-04 9:46

aman2006

20-Apr-04 9:46

Hi I want to initialize this struct
struct CATEGORY_CODES
{
CString strCategoryCode;
int nCategoryID;
CString strCategoryName;
int nHasSubCategory;
int nActive;
};
if i do CATEGORY_CODE stCatCode = {0};

I get the Fatal error on CString members if i try to insert the values init.
Can anybody help me how to intialize the structures in MFC

thanks
shailesh

Re: Structure Initialization

toxcct20-Apr-04 10:30

toxcct

20-Apr-04 10:30

it is not an MFC problem, it is a simple C rule !

if you write {0}, the compiler wont accept for such strusture because it doesn't contain only one member (an such member cannot be stored with a 0).

you have two possibilities :

first one :
<font style="color:purple;">CATEGORY_CODE </font>stCatCode = {
    <font style="color:gray;">""</font>,
    0,
    <font style="color:gray;">""</font>,
    0,
    0
};     <font style="color:green;">// Values are given by default for a nil initialisation</font>
 
with a GNU compiler, you could also write :
<font style="color:purple;">CATEGORY_CODE </font>stCatCode = {
    strCategoryCode: <font style="color:gray;">""</font>,
    nCategoryID:     0,
    strCategoryName: <font style="color:gray;">""</font>,
    nHasSubCategory: 0,
    nActive:         0
};
 
 
second one :
<font style="color:purple;">CATEGORY_CODE </font>stCatCode;
stCatCode.strCategoryCode = <font style="color:gray;">""</font>;
stCatCode.nCategoryID     = 0;
stCatCode.strCategoryName = <font style="color:gray;">""</font>;
stCatCode.nHasSubCategory = 0;
stCatCode.nActive         = 0;

is that ok for you ?

TOXCCT >>> GEII power

Re: Structure Initialization

Rick York20-Apr-04 11:07

Rick York

20-Apr-04 11:07

Give it a constructor that initializes the variables.

__________________________________________
a two cent stamp short of going postal.

Append exported data to MatLab file

Stemple20-Apr-04 9:12

Stemple

20-Apr-04 9:12

I am attempting to save data to a MatLab .mat file from Visual C++. I know how to use matPutVariable to do this in the standard way, but I would like to be able to save this data incrementally without allocating the full mxArray, because the size of the array would be so large as to cause a memory shortage.

Analogously, if I were writing this data to a text file, I would open the text file in append mode and print each datum to the end of the file as it's calculated. Is there a way to do this when saving to a .mat file?

fast data access

Cyberizen20-Apr-04 9:02

Cyberizen

20-Apr-04 9:02

Hello gurus
well actually i am looking for a data structure or something like that for fast access to data. Actually my problem is that i have this image file dimensions size is 200 X 200 and what actually i want to do with the image is extract exhaustively 20X20 parts and make some calcualtions on that window from the image and store them. At present i am storing each 20X20 window in a vector object actually this takes a lot time when i want to retrieve the window and make calculations is there some way i can store this 20X20 window somewhere in the memory my point is fast access where i retrieve the values please help

Regards
Ahmed Ajmal

invoking internet explorer with html/jsp

VirtualRelease20-Apr-04 9:00

VirtualRelease

20-Apr-04 9:00

I need to create a console app or service to run on win98/ME or even 95.
I need to check a directory for the drop of a request file.
The request needs to be packaged for sending to a service on a remote server.It is a web server running jsp etc.
C/C++ needs to send request to either an existing instance of IE or invoke a new instance if one doesn't exist to forward the request.
This sends the request to the web server and the explorer says waiting. When response comes back the browser is used to react to the response etc.
However Visual C program job is essentially over once the browser is invoked (except it continues to check the directory for next request etc)
I am assuming that I need to populate hidden fields on the page and invoke a call to the server.
I have looked at ShellExec and CreateProcess etc. And I am just getting more and more confused.
Can anyone point me in the direction of any reference that can help me with this.
Creating a service on a non NT/XP/2000 machine is my next task as I don't think win9x has a service manager. But that is another story.

Any help would be much appreciated Confused | :confused:

Re: invoking internet explorer with html/jsp

22491720-Apr-04 19:31

224917

20-Apr-04 19:31

use UrlDownloadToFile()
with query strings.

like http://myserver/mypage.jsp?val1=10&val2=surya

by this you can save the result also.

It's not a bug, it's an undocumented feature.
suhredayan@omniquad.com

messenger :suhredayan@hotmail.com

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