C / C++ / MFC Discussion Boards

Re: win32 message queue - Shorter question

Hanan88820-Jan-08 0:42

20-Jan-08 0:42

I used postMessage(CUSTOM_MESSAGE,...)

my desired behaviour is that this message would get to the last spot in the message queue

but it seems that it get to the first spot

c++ wrapper for java language !

amitamit19819-Jan-08 20:42

amitamit198

19-Jan-08 20:42

can anyone help me out how to create a wrapper for java in cpp ?
what i want to do is =>

1. suppose i have jar file...i have to extract it. (done)
2. find all its contents such as classes,methods using reflectin api's. (done)
3. invoke jvm. (done)
4. create a wrapper for methods ,class which are available from step 2 (in c++)(i dont know how to go about it.)

any kind of tips, sample code,source code of any already existing freeware s/w, links are most welcome... !

installing ".sys" file in windows98

zon_cpp19-Jan-08 19:57

zon_cpp

19-Jan-08 19:57

how do i load an ".sys" file in windows 98?

in windows XP, 2000, 2003 and Vista: i load it(.sys file) with calling OpenSCManager, CreateService, OpenService api functions, and i uninstall it with calling ControlService and DeleteService.

how do i load an ".sys" file in windows 98?

Zo.Naderi-Iran

Upload/download file to server

DanYELL19-Jan-08 9:01

DanYELL

19-Jan-08 9:01

I have a program. I want to distribute a passcode so that they
can register the software one-time. The way I currently handle this
is alot of work.

My thought process was this: to create a 100 passcodes like:

14123
45143
34533

just random numbers. I give a number to someone, they type in the
passcode and the software goes to a folder on the web, downloads
an ascii file, removes that number from the list of numbers on that
file, and then uploads that new file to the web. Since that number has
been removed, the passcode was only valid once.

I can download an ascii file from my website, but I can figure out
how to upload that new file to replace the existing file. My question
is twofold:

1. Is my strategy a good strategy for distributing passcodes? Anything
I can do to make it easier.

2. How can I upload a file to replace an existing file on the web?

Please, any response any one can give me will be greatly appreciated.
Sample projects are adored!!

Sincerely,
Danielle Brina (an overworked graduate student)

Re: Upload/download file to server

Christian Graus19-Jan-08 9:36

Christian Graus

19-Jan-08 9:36

Here's how I do it. First of all, I use GUIDs for my passcode, to keep it unique and sufficiently long that it is unlikely to be guesed. Then, I get the processor Id and pass that through to a webservice, which checks if it's an Id already assigned to that passcode, or if that passcode has licenses available. Then it reports this to the client, where I store the passcode and a hashed response key in a file, so I can read that file and check it's validity for licensing in future.

The problem with your approach is that if someone reinstalls on the same machine, registration will fail.

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Re: Upload/download file to server

DanYELL19-Jan-08 9:53

DanYELL

19-Jan-08 9:53

Any chance you have a sample project or know of a sample
project that does something like this?

Please let me know.

My email address is brinasas@yahoo.com

Sincerely,
Danielle Brina (an overworked graduate student)

Notification on Hibernate?

Dominik Reichl19-Jan-08 8:06

Dominik Reichl

19-Jan-08 8:06

Hello!

Is there any way to get a notification when Windows enters the hibernate state? Is a windows message sent, or can one register a callback?

I've found the WM_POWERBROADCAST message, however it seems that you can only detect the standby modus with it, not hibernation.

Best regards
Dominik

Too many passwords to remember? Try KeePass Password Safe!

Re: Notification on Hibernate?

Mark Salsbery19-Jan-08 8:24

Mark Salsbery

19-Jan-08 8:24

The PBT_APMSUSPEND event (in a WM_POWERBROADCAST message) doesn't indicate
the system is entering hibernate state?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Notification on Hibernate?

Dominik Reichl20-Jan-08 0:25

Dominik Reichl

20-Jan-08 0:25

It seems Windows does not send PBT_APMSUSPEND nor PBT_APMQUERYSUSPEND (in WM_POWERBROADCAST) when going to sleep. I've found some other power functions in the meanwhile (CallNtPowerInformation, GetActivePwrScheme, ...), maybe one of these helps...

Thanks anyway for your reply, best regards
Dominik

Too many passwords to remember? Try KeePass Password Safe!

How can capture video from video-capture-card

hanlei000000000919-Jan-08 3:51

hanlei0000000009

19-Jan-08 3:51

Hi all
My computer had installed a video-capture-card at recent(PCI slot).
I use VC8,
What software development kit can do it best?
DirectX show or platform SDK or other?
thanks!

Re: How can capture video from video-capture-card

Mark Salsbery19-Jan-08 7:09

Mark Salsbery

19-Jan-08 7:09

DirectShow[^], which is now in the platform SDK, can do
it well.

For Vista+ only development, there's the
Microsoft Media Foundation SDK[^].

For legacy stuff, there's still Video For Windows[^]
but it's getting a little dated and doesn't provide much functionality
compared to the other two above.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Thanks, I choose DirectShow

hanlei000000000919-Jan-08 22:44

hanlei0000000009

19-Jan-08 22:44

why the code can compile -- about function pointer

George_George19-Jan-08 2:55

George_George

19-Jan-08 2:55

Hello everyone,

I am learning code from others, but I do not know why the following code section can compile?

Why assignment p = new (void (*[3])()) is ok? Are the left side and right side of assignment having compatible type?

[Code]
void (**p)();

int main()
{
p = new (void (*[3])());
return 0;
}
[/Code]

thanks in advance,
George

Re: why the code can compile -- about function pointer

CPallini19-Jan-08 3:17

CPallini

19-Jan-08 3:17

Arrays names are synonim of const pointer (to the same type) hence the magic.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

Re: why the code can compile -- about function pointer

George_George19-Jan-08 21:04

George_George

19-Jan-08 21:04

Thanks CPallini!

Why "Arrays names are synonim of const pointer" could apply to my question? Could you provide more information please?

regards,
George

Re: why the code can compile -- about function pointer

CPallini20-Jan-08 0:11

CPallini

20-Jan-08 0:11

George_George wrote:
void (**p)();

int main()
{
p = new (void (*[3])());
return 0;
}

void (**p)();

declares a pointer to a pointer to a function accepting no arguments and returning no arguments.

new (void (*[3])());

allocates memory for an array of pointers to functions accepting no argument and returning no value.
p can be initialised with the address of the first element of the array, i.e. with the (implicit) array name.

For instance, try the following:

void fun1() { printf("Hi");}
void fun2() { printf(" George");}

void (**p)();

int main()
{
p = new (void (*[3])());
p[0] = fun1;
p[1] = fun2;
p[2] = fun2;

p[0]();
p[1]();
p[2]();

}

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

Re: why the code can compile -- about function pointer

George_George20-Jan-08 0:22

George_George

20-Jan-08 0:22

Thanks CPallini,

Your sample is great! My question is answered.

regards,
George

Structured exception

George_George19-Jan-08 2:47

George_George

19-Jan-08 2:47

Hello everyone,

I am learning structured exception from,

http://msdn2.microsoft.com/en-us/library/ms681409(VS.85).aspx

I read a couple of links from MSDN, but still confused what is structured exception, what is the differences between structure exception and our normal C++ exception, like bad_alloc and various user define exception?

thanks in advance,
George

Re: Structured exception

Hamid_RT19-Jan-08 19:11

Hamid_RT

19-Jan-08 19:11

See Structured Exception Handling (C++)[^] and Microsoft Visual C++ and Win32 Structured Exception Handling
[^].

Re: Structured exception

George_George19-Jan-08 22:04

George_George

19-Jan-08 22:04

Thanks Hamid,

Looks comprehensive! I just briefly read through the article and it seems structured exception is totally different from normal C++ exception. Looks like another approach to produce/handle exceptions, but I have never used and met any API in MSDN documented structured exception before.

Do you have any experience where should we use structured exception?

regards,
George

if IDCANCEL returned in DOMODAL.

Le@rner19-Jan-08 1:02

Le@rner

19-Jan-08 1:02

if i select Cancel button, or select the Close option from the dialog box's other controls of my application are not working there is sum error how can i remove this error.

thanks and regards

Re: if IDCANCEL returned in DOMODAL.

CPallini19-Jan-08 1:52

CPallini

19-Jan-08 1:52

v.j wrote:
there is sum error

Maybe posting the error and the affected code will help.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

Re: if IDCANCEL returned in DOMODAL.

Rajesh R Subramanian19-Jan-08 2:30

Rajesh R Subramanian

19-Jan-08 2:30

If you click on cancel, won't the app close? Care to explain your problem?

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: if IDCANCEL returned in DOMODAL.

David Crow19-Jan-08 11:48

David Crow

19-Jan-08 11:48

v.j wrote:
...my application are not working there is sum error...

Would that be error A or error B?

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: if IDCANCEL returned in DOMODAL.

Paul Conrad19-Jan-08 11:53

Paul Conrad

19-Jan-08 11:53

v.j wrote:
my application are not working there is sum error

That is very poor description of your error. Without knowing what it is, no one can really help.

"I guess it's what separates the professionals from the drag and drop, girly wirly, namby pamby, wishy washy, can't code for crap types." - Pete O'Hanlon

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.