Re: Crypto Api - create key with standard RSA rather than strong RSA (for W2K compatibility) - C / C++ / MFC Discussion Boards

CFile::Read

Sam 200619-Apr-06 14:16

Sam 2006

19-Apr-06 14:16

hi all,

i've got a quick question about cfile::read. i just need to get each line of a text file in a loop so i can process each line. can someone show me how, or tell me where to look?

thanks in advance,
sam kline

Re: CFile::Read

valikac19-Apr-06 14:51

valikac

19-Apr-06 14:51

ReadString()

Kuphryn

Re: CFile::Read

Sam 200619-Apr-06 17:29

Sam 2006

19-Apr-06 17:29

thanks for the tip, i used CStdioFile::ReadString

sam kline

Re: CFile::Read

Bram van Kampen19-Apr-06 15:56

Bram van Kampen

19-Apr-06 15:56

If you look up the Help Files, you will finf:
CFile::Read
virtual UINT Read( void* lpBuf, UINT nCount );
throw( CFileException );

This will read nCount bytes of raw data from the file object, into your (previously created buffer. I suspect from your question that you already tried this, and somewhere failed to read it back. Easy trap to fall into, takes a bit of history. In the Oldendays, when computers took punchcards, (I punched many a card myself on those rotten noisy machines) a protocol had been established for each computer system, largely and loosely based on the telegraph system. In order to get the machine at the other end of the line to advance to a new line, you had to send two control characters, a Line Feed (LF Char, ASCII 0x0A), to move the Paper forward, and a Carriage Return Char(CR char, ASCII 0x0D)
These could be sent in any order, provided both where sent. You can imagine yourself what would happen if either or both where ommitted, the result I can assure you , was generally not legible.
In came the VDU Display, a forerunner of the screen you are looking at reading this, and everybody took a step back! What should we send at the End of a Line,( the Windows concept that a document could extend beyond the boundaries of a screen was only in it's infancy). The Discussion was: either a Line Feed, or a CR, Or, ignore the new technology, and treath it as a printer, and send it both, or send it another magical incantation, with aq deeper meaning as to how the result was to be displayed on the screen. All this upset took place at the time when Bill Gates was getting together with a couple of friends, to start off a new business venture.Between then and now, learned committees where formed to formulate software standards, and found invariably, that to land on one side of the debate, or on the other, would invalidate either way years of established practice, so, the issue was shied away from. Also, as software developed, it became less important, compiler writers, and library writers adopted a standard, and, as long as one was aware of the problem, it was quite easy to write a small routine to convert from one to the other.

The Weazel code started I think in the ANSI C Library, you open a file as: FILE F =fopen("MyFile.Ext","r+"), and when reading the file thus opened, all twobyte CR-NL chars are converted to a single LF.Conversely, if yoy write a buffer containing a LF, it witt be written to file as a LF-CR combination. This happens automatically, (and as some people would say, underhand). Ofcourse, this sort of modifying things read from, or written to file, would not do if you are reading or writing binary data. To allow for this, the ANSI Standard allows for an alternative way of openeng a file, which will read and write a file exactly as is, without underhand modifications. To get this, you use:
FILE F =fopen("MyFile.Ext","rb+")Note the 'b' for Binary!!

Now, all this is relatively easy to follow, if you have a genuine text file, open it with one of the "r" attributes, if it is Binary, use the "rb" attribute. Strings in memory are always stored with a single CR character to denote a new line.

Bring in MS Wiondows, and its associated text controls, and the confusion is of a babylonian nature again, Some controls expect a single LF char, others expect a single CR, and there are others again who expect both, or attach special meaning to the absence or presence of one or the other. I had to write a number of simple routines to copy a string from one buffer to another, just to suit the case, and in the knowledge that the code would probably need modification to support the next version of MFC. I must admit that Microsoft seems to have been consistent sofar, and very little needed changing. However, it remains a nuisance, and something that can quite easily throw those unaware of this conundrum of the path.

regards

LateNightsInNewry

Re: CFile::Read

kiran janaswamy19-Apr-06 19:38

kiran janaswamy

19-Apr-06 19:38

hi,

use StdioFile Class for this Approach and use the Method called ReadLine(...)
and if you want to read entire file use ReadHuge(...) instead of Read(...).

cheers,
uday.

uday kiran

Re: CFile::Read

David Crow20-Apr-06 4:02

David Crow

20-Apr-06 4:02

kiran janaswamy wrote:
...if you want to read entire file use ReadHuge(...) instead of Read(...).

These two methods behave the same in Win32 (i.e., Read() can read entire files).

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Crypto Api - create key with standard RSA rather than strong RSA (for W2K compatibility)

EthannCastell19-Apr-06 13:52

EthannCastell

19-Apr-06 13:52

I want to encrypt a string using MS Crypto API on Windows XP and decrypt it on Win XP OR on Win 2000. I have encrypt and decrypt code working on XP but the decrypt returns garbage on Win 2000.

I think that this is because the string was encrypted with Strong RSA, which is the default on XP, but W2K (without high security pack) does not support strong RSA. So how do I tell XP to encrypt using standard RSA, or RSA that is supported by W2K ? I have looked at the other provider types but they appear to be subsets of PROV_RSA_FULL and I'm not sure if they will work with W2K either.

The code I'm using is pretty standard:
CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, 0);
CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash);

Re: Crypto Api - create key with standard RSA rather than strong RSA (for W2K compatibility)

YaronNir20-Apr-06 0:40

YaronNir

20-Apr-06 0:40

All the samples in MSDN uses PROV_RSA_FULL, and it says on the bottom that it is supported by W2K. i've worked before with PROV_RSA_FULL, and I haven't encountered with any problems what so ever...

maybe something you do is wrong?

Yaron

Ask not what your application can do for you,
Ask what you can do for your application

How I can enforce key length and CSP?

EthannCastell20-Apr-06 2:33

EthannCastell

20-Apr-06 2:33

Yes PROV_RSA_FULL is supported on W2K. But there were changes to the default encryption method in XP. XP now uses Strong RSA encryption and 128 bit key length. Windows 2000 used (Not Strong) RSA encryption and 40 bit key length.

The string is encrypted on XP but needs to be decrypted on Windows 2000. W2K will try to decrypt using PROV_RSA_FULL but only using a 40 bit key and this is why it fails.

Does anyone know how to force the Crypto API to use standard (NOT Strong) encryption and 40 bit encryption?

Thanks

Property Sheet Problem

si_6919-Apr-06 13:11

si_69

19-Apr-06 13:11

Hi All

I have a property page with a tabbed property sheet, which works fine but im a bit stuck on how you get
the values back from each of the property sheets

property sheet is based on the CPropertySheet class, which is not based on CDialog but it provides the same functionality as a dialog.

i wanted to do something like the below, but when ok is called m_c_check doesnt have a value

can anyone point me in the right direction

CEmplSheet EmpSheet("Employment Application");

CEmploymentDlg Empl;
CExperienceDlg Exp;
CEducationDlg Educ;

EmpSheet.AddPage(&Empl);
EmpSheet.AddPage(&Exp);
EmpSheet.AddPage(&Educ);

EmpSheet.EnableStackedTabs(TRUE);

m_pMainWnd = &EmpSheet;

int nResponse = EmpSheet.DoModal();

if (nResponse == IDOK)
{
int i= Educ.m_c_check1.GetCheck();
}
else if (nResponse == IDCANCEL)
{
}

Re: Property Sheet Problem

valikac19-Apr-06 14:57

valikac

19-Apr-06 14:57

in most cases property pages reside in the property sheet class

Kuphryn

Re: Property Sheet Problem

si_6919-Apr-06 22:32

si_69

19-Apr-06 22:32

thanks for the reply,

but if your not going to be helpful is there any point

Re: Property Sheet Problem

David Crow20-Apr-06 4:04

David Crow

20-Apr-06 4:04

si_69 wrote:
but if your not going to be helpful is there any point

If you are not going to bother to ask a correct question, you mustn't complain about the answers provided. To say that a property page contains property sheets is just nonsensical.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: Property Sheet Problem

prasad_som19-Apr-06 18:25

prasad_som

19-Apr-06 18:25

will this help you ?
http://www.codeproject.com/script/comments/forums.asp?msg=1257711&forumid=1647&Page=4&userid=1304767&mode=all#xx1257711xx[^]

Re: Property Sheet Problem

kiran janaswamy19-Apr-06 19:12

kiran janaswamy

19-Apr-06 19:12

hi all,

the same problem i am suffering like any thing. please provide me a solution for this which helps me a lot.

thanks,
uday.

uday kiran

Re: Property Sheet Problem

si_6919-Apr-06 22:33

si_69

19-Apr-06 22:33

yes it does, thanks

Setting mask for bitmap for CButton

Andre xxxxxxx19-Apr-06 12:50

Andre xxxxxxx

19-Apr-06 12:50

I've added some bitmaps to my resources which I would like to display in buttons, but no matter if I use a CBitmap and SetBitmap or an Icon, a CImageList, I can't set the background transparent.

CImageList::Add says for crMask, "Color used to generate the mask. Each pixel of this color in the given bitmap is changed to black and the corresponding bit in the mask is set to one."

If I use that the background is really black. SetBkColor to CLR_NONE also doesn't work.

I haven't found an example on CP where the mask color is set for a button, maybe someone can help?

Thanks
Andre

Re: Setting mask for bitmap for CButton

Shog⁹19-Apr-06 14:10

Shog⁹

19-Apr-06 14:10

ABuenger wrote:
If I use that the background is really black. SetBkColor to CLR_NONE also doesn't work.

Make sure you are both creating the image list with a mask (ILC_MASK) and drawing it with the proper flags (ILD_TRANSPARENT). AFAIK, SetBkColor() only applies when you're drawing non-transparently (ILD_NORMAL) or blending (ILD_BLEND50).

Now taking suggestions for the next release of CPhog...

Help me With My code

ALQallaf19-Apr-06 12:37

ALQallaf

19-Apr-06 12:37

I wrote this code to send msg to MSMQ , but it did not work
can any one give me any idea to fix it,if there is something wrong ?
this is my queue -> gateway\private$\newqueue
--------------------------------

<br />
#include "stdafx.h"<br />
#include <stdio.h><br />
#include <atlbase.h><br />
#include <iostream><br />
#import <mqoa.dll><br />
using namespace MSMQ;<br />
using namespace std;<br />
 <br />
void Send();<br />
<br />
int main(int argc, char* argv[])<br />
{<br />
    Send();<br />
    return 0;<br />
}<br />
<br />
void Send()<br />
{<br />
	IMSMQQueueInfoPtr spQInfo("MSMQ.MSMQQueueInfo");<br />
	spQInfo->PutPathName(SysAllocString(OLESTR(".\\newqueue")));<br />
	IMSMQQueuePtr spQSend = spQInfo->Open(MQ_SEND_ACCESS, MQ_DENY_NONE);<br />
<br />
	IMSMQMessagePtr spQMsg("MSMQ.MSMQMessage");<br />
	spQMsg->Label = "This is a Word Document2";<br />
	spQMsg->Body = "My Boudy";<br />
	spQMsg->Send(spQSend);<br />
	spQSend->Close();<br />
}<br />

-- modified at 18:41 Wednesday 19th April, 2006

Re: Help me With My code

David Crow20-Apr-06 4:21

David Crow

20-Apr-06 4:21

ALQallaf wrote:
...but it did not work

Which means nothing if you don't tell us which part did not work. Your code has no error checking. What does the Send() method return?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: Help me With My code

ALQallaf20-Apr-06 7:20

ALQallaf

20-Apr-06 7:20

thank you, it give me an error when i try to run it thats all (Debug Error! abnormal program termination) , i have project i have to make it Unsure | :~

Re: Help me With My code

ALQallaf20-Apr-06 7:55

ALQallaf

20-Apr-06 7:55

Thank you it has been fixed Laugh | :laugh:

the only things that i have trust on my self Poke tongue | ;-P

,
the problem it was from some parametar

thanks you DavidCrow

Set Volume JUST for my Application

<_CodeExplorer_>19-Apr-06 12:17

<_CodeExplorer_>

19-Apr-06 12:17

Hi everybody,

First of all, i've tried to find a solution for my problem by searching with google or in other message boards but no one could help me Cry | :((

I am writing a Media Player, in which the user should have the posibility to change the volume of the currently playing track; BUT not the master system volume. WTF | :WTF: