i want to read that file - C / C++ / MFC Discussion Boards

Re: hex values to words

David Crow4-Jan-07 3:24

David Crow

4-Jan-07 3:24

flippydeflippydebop wrote:
which i believe to be seconds since the year 1996.

Since 1996 is not considered a special year by the computer, you'll need to add the appropriate number of seconds to that value so that it reflects date/time since, for example, 1-Jan-1970. That's roughly 820,454,400. Now you can use the date/time functions that handle values from 1-Jan-1970.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

"synchronized" method call in dll

trumper2-Jan-07 23:21

trumper

2-Jan-07 23:21

Hi, I am trying to write a "synchronized" function call in my dll so that programmers that use my api can expect to only make single-instance function calls. The basic motivation is that each function call spawns a thread hence I would like to greatly restrict the number of threads spawned (basically 1-and-only-1 thread spawn per function call to my api).

//In my program.h header file
int threadCode = 0; //no problem if threadCode is instantiated in the header file
HANDLE threadMutexEvent;
#define PROC_THREAD 0
#define ERR_THREAD_INUSE 1

//In my program.cpp program file
BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) {
//problem arises if I instantiate threadCode here
//threadCode = 0;

threadMutexEvent = CreateEvent(NULL, false, true, "MutexEvent");
return true;
}

int WINAPI processRequest() {
WaitForSingleObject(threadMutexEvent, INFINITE);
if(threadCode == PROC_THREAD) {
threadCode = ERR_THREAD_INUSE;
SetEvent(threadMutexEvent);
} else {
SetEvent(threadMutexEvent);
return ERR_THREAD_INUSE;
}

//spawn thread to do some work for me
return 0;
}

As you can see, I am using Win32's synchronization mechanism to do some simple synchronization on the global variable threadCode. As seen in the code comments listed above, everything is fine if I instantiate threadCode in the header file, however, once I shift the instantiation of threadCode to DllMain the synchronization gets messed up. Basically, seperate function calls to processRequest would always "see" threadCode == PROC_THREAD and go ahead to spawn another thread (which is what I am trying to prevent Frown | :(

If all things fail I would fall back on leaving the instantiation in the header file, but I am really curious as to why the 2 seemingly identical instantiation calls would result in 2 drastically different results.

Thanks

Re: "synchronized" method call in dll

David Leyva3-Jan-07 6:54

David Leyva

3-Jan-07 6:54

Hi
I think the reason is that in the first case (var in header) initiation is only one time execution, but in the second case depends on dll instance.

I think your variable have to be static, try that way

Regards

David

Re: "synchronized" method call in dll

trumper3-Jan-07 15:02

trumper

3-Jan-07 15:02

Hi David,

Thanks for the reply. I have tried using static and got the same result. I am quite sure only one instance of the dll is being loaded each time my test application is using it as I have other code in DllMain that clears the UI of all user input (which I don't see happening).

Thanks

Re: "synchronized" method call in dll

David Leyva3-Jan-07 18:19

David Leyva

3-Jan-07 18:19

Another idea is replace current sync code instead a simple critical section. You have to init cs in DllMain I think that should work and is simple.

David

Re: "synchronized" method call in dll

David Leyva3-Jan-07 18:23

David Leyva

3-Jan-07 18:23

Sorry, but I think that is not a good idea put a Global var in a header file.

Put all global vars in the cpp file. In the header file only function ptototypes.

Regards

David

Re: "synchronized" method call in dll

trumper4-Jan-07 16:13

trumper

4-Jan-07 16:13

Hi David,

I took your advice and things seem fine now. No more global variables in the header file for me anymore Laugh | :laugh:

Thanks

i want to read that file

naveen padiyar2-Jan-07 20:41

naveen padiyar

2-Jan-07 20:41

i want that file this symbol ü to Content-Type: text/html; charset=ISO-8859-1,how read that file.
file is

FILE IS -------

D\ ü T^ V ived: by 10.82.180.5 with HTTP; Mon, 11 Dec 2006 20:39:06 -0800 (PST)
Message-ID: <c77d80a30612112039v121c49a6q2ab957200afe158a@mail.gmail.com>
Date: Mon, 11 Dec 2006 20:39:06 -0800
From: "hiimnsp uknowthatname" <uknowthatname@gmail.com>
To: uknowthatname@gmail.com
Subject: sub 15 it world
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_Part_151408_4186001.1165898346884"
Delivered-To: uknowthatname@gmail.com

------=_Part_151408_4186001.1165898346884
Content-Type: teT^ ü d` D\ lain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

hi naveen hru .
give me some detail about it world and other thingh .
tell me some concious way .
all r right .
naveen padiyar

------=_Part_151408_4186001.1165898346884
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

hi naveen hru .
give me some detail about it world and other thingh .
tell me some concious way .
all r righd` ü T^ br>naveen padiyar

------=_Part_151408_4186001.1165898346884--

-- modified at 6:09 Thursday 4th January, 2007

naveen padiyar

ü'" "' " (It's simple)

<color>Aljechin 2-Jan-07 21:35

<color>Aljechin

2-Jan-07 21:35

^ ü@ 3 d` D

Re: ü'" "' " (It's simple)

Hamid_RT3-Jan-07 1:18

Hamid_RT

3-Jan-07 1:18

WhiteSky

Re: ü'" "' " (It's simple)

Mark Salsbery3-Jan-07 7:07

Mark Salsbery

3-Jan-07 7:07

Re: ü'" "' " (It's simple)

Hamid_RT3-Jan-07 17:41

Hamid_RT

3-Jan-07 17:41

I guess maybe my database is old or bad command or... Big Grin | :-D

WhiteSky

Re: ü'" "' " (It's simple)

naveen padiyar4-Jan-07 20:09

naveen padiyar

4-Jan-07 20:09

hi . i want read the file ü to Content-Type: text/html; world .i find both these point starting "ü" and end"Content-Type: text/html" . that is .dbx extension file. i want to read the matter of these starting and ending point in vc++.
how i can read the text between to point starting and ending point.

naveen padiyar

How to create a .dat file

poda2-Jan-07 20:28

poda

2-Jan-07 20:28

Does any one know how to create a .dat file.
Not just saving a text file by changing the extension.
The file should only be opened using specified program and
not by other editors.

For example,Yahoo messenger archieves are stored in
.dat file format.
I want to save the data of my application in a safer way.
Help please.

Thanks

Re: How to create a .dat file

Christian Graus2-Jan-07 22:17

Christian Graus

2-Jan-07 22:17

poda123 wrote:
Does any one know how to create a .dat file.
Not just saving a text file by changing the extension.

A .dat file will have it's own file format, which won't be text. You can similarly define any file format that you like. Typically, these will contain metadata to define the values that are coming up, or will be fixed and, for example, store numbers as numbers, instead of as ASCII or Unicode values. Another option is to use compression or encryption to hide your data in your format.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: How to create a .dat file

poda2-Jan-07 23:11

poda

2-Jan-07 23:11

That's what really I want.
How to define my own file format.

Re: How to create a .dat file

Joan M3-Jan-07 1:30

Joan M

3-Jan-07 1:30

At first you should think on how do you want to store that data, then serialize that data into a file using a function that encapsulates the way you want to do it. In fact, you could generate a "document" class with a load and save functions.

You can make it as complicated as you want by applying encryption methods and others, but you must decide how to do it.

In fact if you want to generate some kind of file that only your application must be able to open and understand, you should decide how do you want to store that data without thinking on making it standard in any way.

If you want to open that file automatically with your application then register the file extension.

Hope this helps.

Re: How to create a .dat file

Daniel Kanev2-Jan-07 23:18

Daniel Kanev

2-Jan-07 23:18

There are many different ways. For instance if you want to store point coordinates you can create a structure like this

struct Point
{
double x;
double y;
};

and store all points you have consequentially in the file. There are different ways of doing that too. The simplest is using <stdio.h>

FILE* f = fopen("test.dat","bw");
fclose(f);

modified 8-Mar-17 3:51am.

Re: How to create a .dat file

poda3-Jan-07 21:29

poda

3-Jan-07 21:29

Thanks for suggestions!
Thank you.

Re: How to create a .dat file

David Crow3-Jan-07 5:39

David Crow

3-Jan-07 5:39

poda123 wrote:
Does any one know how to create a .dat file.

In exactly the same way as you would any other file. A file's extension has no bearing on how it is created.

poda123 wrote:
The file should only be opened using specified program and
not by other editors.

This is rather difficult, if at all, to achieve.

poda123 wrote:
For example,Yahoo messenger archieves are stored in
.dat file format.

But that does not imply that YM could open any .dat file, only those that it created.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

How to set Cursor

Abhijeet Rajput2-Jan-07 20:23

Abhijeet Rajput

2-Jan-07 20:23

Hello Friends,
I want to change the Cursor when mouse is on Button.
This I want to do in ATL.

Abhijeet

Re: How to set Cursor

prasad_som3-Jan-07 0:00

prasad_som

3-Jan-07 0:00

You Can use SetCursor. Use CComModule::m_hInst as first parameter.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: How to set Cursor

Cristian Amarie3-Jan-07 10:30

Cristian Amarie

3-Jan-07 10:30

Alternatively, you can derive a class from CButton, implement a static method RegisterClass that will retrieve the BUTTON class info using GetClassInfo(Ex), then replace the class name with your class name, window procedure with yours and also the class hCursor with the desired cursor.
A similar technique can be found in MSDN for custom dialog classes.

What is alternative function for atof() in unicoding ?

Atul232-Jan-07 20:15

Atul23

2-Jan-07 20:15

Hi All
Is there any alternative function for atof() which accept wchar_t datat and convert to float.

Thanks

Atool

Atool

Re: What is alternative function for atof() in unicoding ?

CPallini2-Jan-07 20:32

CPallini

2-Jan-07 20:32

_wtoi

you can find it, togheter with _ttoi, the generic one, in MSDN, if you search for atoi, haven't you?

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.

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