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> On NT 4.0 Workstation pop up a message box before a user
> logs on using the Ctrl-Alt-Delete sequence.
It seems that you need to use the Winlogon/GINA stuff. MSDN has detailed info about this. Honestly, it's not a project for a beginner. Good luck, anyway.
Tomasz Sowinski -- http://www.shooltz.com.pl
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Hi.
I want to create an array of an array of char's. Basically, I want to call calloc (or whatever) on a char**. Whenever I do this, I get runtime memory errors or compile time casting errors.
I need this so that I can create an 20 element long array of an array of 256 char's (that's confusing  ). However, I will not know the actual lengths of the arrays until runtime, so that's why it needs to be dynamically allocated. Any help would be appreciated.
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OK, here's how to do it (if I get the definition correct). So, you basically want an array of pointers to strings, just like argv**. I'm going to do it for the case of 20 elements, but you can replace it with any variable you want:
int i;
char **aszNames;
char **pCurr;
aszNames = malloc( sizeof(char*) * 20 );
pCurr = aszNames;
for(i = 0; i < 20; i++) {
*pCurr = malloc( sizeof(char) * 257 );
pCurr++;
}
After this, you have 20 string elements which can carry a max of 256 characters. Of course, you can make everything variable by replacing the constant values.
And remember, to clean up after yourself after this.
Frank
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Thanks for the quick response!
The code works, but I have a question about cleaning up:
Should I call free() on both the pointers or just one?
Thanks in advance!
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You have to clean up both pointers. So, for the code I gave before, you would cleanup this way:
pCurr = aszNames;
for(i = 0; i < 20; i++) {
free(*pCurr);
pCurr++;
}
pCurr = NULL;
free(aszNames);
aszNames = NULL;
That's pretty much it. I NULLed the pointers because I use the debugger a lot and it helps me remember whether or not there is anything assigned to the pointers.
Frank
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Hello, first of all, let me say that I'm a begginer speaking english... so, I'm sorry if it's hard to read my question.
I have developed a win2k service using the a downloaded service wizard, now I would like to install it and to run it...
If I make a double click to start it up (as a normal app.) it don't make anything.
This service is intended to control some not allowed key presses (alt+tab and so on...)
I had developed an app. some time before with a class that handled them, and it worked for me, but now it don't make anything.
I'm using SetWindowsHookEx(...)
If you want/can help me, please send an answer to the forum, I will answer any question that you could have referenced to my project and surely caused by my "english".
Thank you in advance.
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You cannot run a service like a normal application, if you just doubleclick on it, it does nothing. Just like you say...
I don't know what wizard you used to make the service, and how it works, but normally you install a service by typing, in a command promt, "appname -install", and starts it by typing "net start servicename". Both without the quotes...
A service runs as standard a the "system" user, and whey you try to use SetWindowsHookEx() you get events fro the system user, not for the logged on user.
In the service manager you can make the service log on as a specified user, and then it *might* work, if the same user logs on. But, if another user logs on itdon't work, because the service catches events for the user it logs on asn ot the interactive user...
- Anders
Money talks, but all mine ever says is "Goodbye!"
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There's an MSDN article called "Installing a Service" that shows code to register (install) a service with the SCM.
Often, a service application has command line options that can be used to trigger the install and uninstall code - for example running '> MyService /i' could run the install code.
Once that's done, you can use net start, SC.EXE, or the services applet in control panel to control things. You'll find registry entries for your service in HKLM\SYSTEM\CurrentControlSet\Services.
HTH
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I believe I asked how to convert a number from normal base 10 to hexadecimal, base 16. Now I need to go the reverse, I need to convert a hexadecimal string to a base 10 number...ie: 14 in hex is 20 in decimal, 3C in hex is 60 in decimal.
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That looks like the function I need. However the following should work (I think) and doesn't.
long temp = strtoul("0x14", NULL, 10);
I thought this should return 20 (the decimal value of the hex-string 14), however it returns 0, which means that it couldn't convert the string....what am I missin?
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0x14 will not convert when base is 10. Use one of these:
temp = strtoul("0x14", NULL, 16);
temp = strtoul("14", NULL, 16);
Note that '0x' prefix is optional.
Tomasz Sowinski -- http://www.shooltz.com.pl
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The code I'm using to set the image list and load the bitmap resource is as follows:
m_CImageList.Create(20,20,ILC_COLOR,2,10);
HBITMAP hBitmap = LoadBitmap(_Module.GetResourceInstance(),MAKEINTRESOURCE(IDB_CLOSEDFOLDER));
m_icons[0] = m_CImageList.Add(hBitmap,(HBITMAP)0);
I've tried ILC_COLOR32, and all the other ILC_ variations, and the icon comes out grey instead of color as it should.
-Jack Mott
jackm@scalablesoftware.com
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How to insert data in CHtmlView from a string table without using the Navigate/Navigate2.
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How can I create an Add-in for Outlook 2000 using Developer Studio ?
Thanks for your answer...
Georgina
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Go to msdn.microsoft.com and do a searh for ComAddin.exe or ComAddin. Its a sample add-in for the Office programs. It takes a little modification to get it to work with Outlook, but it's not that hard.
Bret Faller
Odyssey Computing, Inc.
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Hi,
I'm having problems using EnumEnhMetaFile. The problem is that on
some systems it does not call the callback function. The return value is
success. Everything is done according to MSDN samples.
I've made some logging version of the program, using same wmf file to
enumerate. On both systems (the one where it works and the one where it
does not work) there are same parameters for EnumEnhMetaFile.
It works on most of the machines but on some systems it does nothing.
It does not depend on opererating system. We have users with two
computers with same version of windows. On one it calls the callback
on another it does not.
The big problem is I am unable to reproduce the problem here to be
able to debug it. We have no reports of this problem on WinNT/2000.
I belive it can be some conflict with installed software, but who knows?
Thank you for any idea what is wrong.
Pavel
pavel@minar.cz
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Hi there,
Supposing I have two header files called header1.h and header2.h - and I have two sourcefiles called source1.cpp and source2.cpp, which contain the constructors etc for classes declared in the respective header files.
Now, I want to call a public member function from source2.cpp that was declared in header1.h. Obviously I can do this OK from source1.cpp but I can't do the same from source2.cpp.
I realise this is a basic question but I'm a newbie. Any help (and examples) would be greatly appreciated. I've had a good old hunt around my books and MSDN but can't find a solution.
E.g.
Header1.h
---------
class A
{
public:
void member_function();
}
source2.cpp
-----------
#include "Header1.h"
...
...
void calling_function(void)
{
// this won't work
member_function();
}
Thanks in advance!
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Stephen,
you're thinking too plain C...
You define a class A having a member function (also called method) member_function. Your calling_function will call a function member_function having on the global namespace, which doesn't exist.
This will work:
....
A myInstanceOfA;
myInstanceOfA.member_function();
....
Or, if you have *very good* reasons to have static functions in your class:
class AA
{
public:
static void static_member_function();
};
then this will work also:
....
AA::static_member_function();
....
Thomas
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Thanks for the help guys, but still no luck.
On declaring an instance of the class (in a different sourcefile than the one containing the constructor) as advised, I receive the 'Classname' : undeclared identifier error. I have included the header file containing the class's definition at the top of the sourcefile.
Is there something obvious I'm missing? (apart from a brain).
In case it helps, I'm using VC++6 and it's an App Wizard generated SDI project.
Cheers, Stephen.
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What is looks like your missing is context.
To call a member function(method) it must be called in association with an object of the class it belongs to.
You declare, say
class A {
..
public:
void member_function(void);
...
};
you have to call it like this:
{
A anInstanceOfa( ... ); // create an instance of A
...
anInstanceOfa.member_function();
...
}
or maybe: A *ptrA = new A(.. )
ptrA->member_function();
the member_function is only meaningfull in the context of a specific object of
type A.
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hia,
how do we reset a file pointer to the beginning of the stream?
if we have an input file stream fin, then the following code complains about ios_base. what do i do???
fin.seekg(0, ios_base::beq);
please help. thanx.
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Hi !
Try ios_base::beg instead of ios_base::beq ... or it just was a misprint ?
Best regards,
-----------
Igor Soukhov (Brainbench/Tekmetrics ID:50759)
igor_soukhov@yahoo.com | ICQ:57404554 | http://siv.da.ru
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hi,
you're right, i was misreading - and hence, mistyping - the beg thing. but it doesn't work that way either... the error message is
error C2653: 'ios_base' : is not a class or namespace name
i'm sure you know what it means. i guess i have to include something or the other but am not sure what. please oblige.
imran.
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