C / C++ / MFC

Joerg Wiedenmann23-Mar-03 23:22

Joerg Wiedenmann

23-Mar-03 23:22

it was by mistake, sorry.

Thanks
widi

-

Rickard Andersson²⁰23-Mar-03 23:24

Rickard Andersson²⁰

23-Mar-03 23:24

Joerg Wiedenmann wrote:
it was by mistake, sorry.

It's okay!

have a look at my message again.. I've change some parts of it!

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Joerg Wiedenmann23-Mar-03 23:27

Joerg Wiedenmann

23-Mar-03 23:27

Thanks.

-

Joan M23-Mar-03 23:58

Joan M

23-Mar-03 23:58

If you want to hook the keyboard, you should create a system wide keyboard hook, this kind of hook must be placed in a DLL, and can be installed from anywhere (your program, a service...).

In order to hook any key this should be right, but if you want also to control Ctrl+Alt+Del you should create a gina.dll that would allow you to handle it, if you don't want to do this and you don't mind a messagebox (horrible by my point of view) you can search for a question like yours 5 or 6 days before that asked more or less the same, the fact is that somebody told there that it was a method to handle the Ctrl+alt+del... there without a gina.dll.

the best way to do it is the gina.dll...

Anonymous24-Mar-03 20:43

Anonymous

24-Mar-03 20:43

Thanks, I've installed that low level keyboard hook and it works Big Grin | :-D

.
I don't know what you mean with that gina.dll Confused | :confused:

, but I now searching that question (this could take a while because of the high-tech internet connection in my school (2,2 kb/s)).

Thanks again
-widi

P.S. Today, computers in school are working great again Mad | :mad:

... I've signed in and what do I see in the Your Name Edit ? Anonymous ?? - s**t f*****g school-computer.
Sorry Blush | :O

, but this time I had to say someting...

Joan M24-Mar-03 21:31

Joan M

24-Mar-03 21:31

The gina.dll is a special dll that controls the autentification of users and Ctrl Alt Del (and other stuff also).

It's a security matter:
Microsoft couldn't allow anybody to write down a simple program that could capture the paswwords or info related to one user in the logon screen. And in order to avoid that they use a GINA.DLL that has all related to the logon (including the CtrlAltDel).

the only way to make it work properly is to make a GINA DLL (or to get someone that is already made) and substitute the one in the system.

This means that in order to do so you must have permission of the administrator of that computer to do that...

hope this helps...

Anonymous24-Mar-03 22:27

Anonymous

24-Mar-03 22:27

I guess I have now enough input to get it to work.

Thanks
widi

killing message box

r i s h a b h s23-Mar-03 22:13

r i s h a b h s

23-Mar-03 22:13

dear all,
i've an sdk application with a window.
on the WM_QUERYENDSESSION message, a message box pops up.
i 've 2 problems

1) if i make my window hidden (SW_HIDE), all the message boxes are also hidden( fired on WM_QUERYENDSESSION)
so how do i ensure that the message box is visible even if window is hidden.

2) how do i kill the message box say after 5 seconds

thanx and regards

rishabhs

Convert float to double

wow999923-Mar-03 20:51

wow9999

23-Mar-03 20:51

Dear all

How to convert float to double?

Thanks

Rage23-Mar-03 21:01

Rage

23-Mar-03 21:01

Is this not working ?

float f=1.5f;
double d;
d=(double)f;

~RaGE();

RaajaOfSelf23-Mar-03 22:00

RaajaOfSelf

23-Mar-03 22:00

if u are using c++

double_var=static_cast<double>(float_var)

Jambolo25-Mar-03 17:03

Jambolo

25-Mar-03 17:03

d=(double)f;
d=static_cast<double>(f);

Interesting. This always works for me:

<br />
d = f;<br />

Setting default font for CRichEditCtrl

R^eservoir D^og23-Mar-03 23:48

R^eservoir D^og

23-Mar-03 23:48

you can do the following

float f = some_value;
.
.
.
double d = static_cast<double>(f);

think it should work!

And you will know my name is the Lord when I lay my vengeance upon thee.

Ph@ntom23-Mar-03 20:22

Ph@ntom

23-Mar-03 20:22

Please anyone can help me how to set the default font for CRichEditCtrl.

Thanks Smile | :)

The Phantom

DDI Hooking

vikramlinux23-Mar-03 20:21

vikramlinux

23-Mar-03 20:21

Is it possible to Hook the DDI funcion calls? How? Unsure | :~

Vikrams

Web Browser Control

Steven M Hunt23-Mar-03 16:02

Steven M Hunt

23-Mar-03 16:02

Can I place a web browser control into the main window of a non Doc/View or non Dialog based application?

-- Steve

Re: Web Browser Control

Neville Franks23-Mar-03 23:27

Neville Franks

23-Mar-03 23:27

SteveBob wrote:
Can I place a web browser control into the main window of a non Doc/View or non Dialog based application?

You should be able to, but why makes things more difficult for yourself.

Have a look at the links here: http://www.codeproject.com/useritems/HTMLCtrlSample.asp?msg=452093#xx452093xx[^]

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

help with Dynamic allocation in C.

mnjobes23-Mar-03 14:55

mnjobes

23-Mar-03 14:55

i've been working on this program (cryptology based) and just realized that the only way that it would be up to standards; would be to have a user defined lenght of the array of characters (captured by getchar() ). I am only in the 3rd month of my programming class, so we have not yet covered dynamic allocation (I don't know if we even will). I know that this is C++ but the people in C# said I should come here, you all are probably smarter anyway.
Long story-short. I need to capture an array of characters where, as the user types, the reallocation would be made; so no prompting of #'s just typing. here is how I tryed to do it but recived errors in execution, it does compile(What am I doing wrong??). I'm having a lot of trouble with this one. thanks bunches for your help Smile | :)

.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int char_to_num(char input);
void main (void){

char egrab,*cin;
int i,j,num,str_size;//, *t;

scanf("%c", &egrab); /*egrab grabs the enter from the previous
module this is a small part of my thing*/
printf("\nPlease enter the characters))>: ");
num = 0;
str_size=10;

cin= (char *)calloc(str_size, sizeof(char));

for(i=0; i<(i+1); i++,cin+=10)
{
for(j=0; j<10;j++,cin++){

*cin = getchar();
if (*cin =='\n')break;
num += 1;
}
if (*cin =='\n')break;
cin = (char *)realloc(cin, (sizeof(char)*10));

}
cin[i+j] = 0; /*close as to be printed as a string later*/

/*fill the array to be encrypted ( t[] ) with integer conversion*/

for(i=0; i<num;i++,t++,cin++){

*t="char_to_num(*cin);}

/*print" out="" the="" results="" as="" a="" check*=""

="" printf("\nnum="%d\n"," num);

="" for(i="0;" i<num;i++){
="" printf("%c",="" cin[i]);}

="" printf("\n");

="" i<num;i++,t++){
="" printf("%d="" ",="" *t);}

}="" *end*=""
="" ******************************************************************************************="" *this="" will="" convert="" character="" into="" number="" (67="" total="" possibilites)*=""

int="" char_to_num(char="" input){

="" int="" output;

="" if="" (="" (input="=" 'a')="" ||="" ){
="" output="1;}
" else="" if(="" 'b')="" 'c')="" 'd')="" 'e')="" 'f')="" 'g')="" 'h')="" 'i')="" 'j')="" 'k')="" 'l')="" 'm')="" 'n')="" 'o')="" 'p')="" 'q')="" 'r')="" 's')="" 't')="" 'u')="" 'v')="" 'w')="" 'x')="" 'y')="" 'z')="" input="=" '!'="" '@'="" '#'="" '$'="" '?'="" '^'="" '&'="" '*'="" '('="" ')'="" '-'="" '_'="" '=" ){
output = 39;}
else if( input == " +'="" '\\'="" '|'="" '`'="" '~'="" '.'="" ','="" '0'="" '1'="" '2'="" '3'="" '4'="" '5'="" '6'="" '7'="" '8'="" '9'="" '<'="">' ){
output = 59;}
else if( input == '[' ){
output = 60;}
else if( input == ']' ){
output = 61;}
else if( input == '{' ){
output = 62;}
else if( input == '}' ){
output = 63;}
else if( input == '/' ){
output = 64;}
else if( input == ';' ){
output = 65;}
else if( input == ':' ){
output = 66;}
else if( input == '%' ){
output = 0;}
else {
output = -1;}

return(output);
}

THANKS AGAIN.

Taka Muraoka23-Mar-03 15:11

Taka Muraoka

23-Mar-03 15:11

/quick look

the problem is probably in your call to realloc() - the parameter specifies the new number of bytes the buffer should be, not the number of extra bytes you want.

you should also not use the variable name cin - it has special meaning in C++

and ditch the long if-else statement at the end! look at isalpha(), ispunct() and toupper(). A-Z are contiguous in ASCII so toupper(ch) - 'A' will map the letter in ch to a value between 0 and 25.

You should save yourself and your company years of grief by shooting yourself through the head immediately. Believe me, in the long run it'll turn out better for everyone. - Tyto (at arstechnica)

Awasu 1.0[^]: A free RSS reader with support for Code Project.

mnjobes23-Mar-03 19:09

mnjobes

23-Mar-03 19:09

Thanks.I changed the 'cin' to 'ci' and adjusted the realloc to the following yet I cannot change the long if else statement because of my main program (long story involving multiplicative inverses of modular functions), so the realloc is now...

ci = (char *)realloc(ci, (/**/ sizeof(char) * (20+(10*i)) /**/) );

which should do what I want (realloc 10 char every loop if 10 or more are typed), yet I still recieve this:

"Expression: _CrtIsValidHeapPointer(pUserData) assertion failure"

, what on earth does that mean? I have a feeling that I have much more than just one problem. I must addmit though that this has become quite fun, so far in class i've picked up everything with ease, seeing how complicated C can get is really cool to me(even though i think that i have no idea how complicated C can get). anyway if you have ANY other ideas that would be great!

Taka Muraoka23-Mar-03 19:16

Taka Muraoka

23-Mar-03 19:16

This error means that you've passed a pointer in to the system that wasn't given to you by the system.

mnjobes26-Mar-03 20:32

mnjobes

26-Mar-03 20:32

Thanks for your help i've fixed the problem, i made a really dumb mistake. now comes the next point; so now how should i go about dynamicly declaring a n-dimentional array (i mean a nxn matrix, if my language was wrong)???