Re: Hey Tom, are you doing a survey? - C / C++ / MFC Discussion Boards

Re: how to pass data in a file after reading

David Crow6-Jul-07 3:03

6-Jul-07 3:03

Your code snippet likely doesn't work because: 1) you are not initializing noc, and 2) you are doing nothing with ch. Try:

noc = 0;
while (1)
{
    ch = fgetc(fp);
    if (EOF == ch)
        break;
 
    test[noc] = ch;
    noc++
}

Make sense?

"A good athlete is the result of a good and worthy opponent." - David Crow

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

Function-style cast

tom groezer5-Jul-07 20:03

tom groezer

5-Jul-07 20:03

Where exactly do we use function-style casts?

Hey Tom, are you doing a survey?

CPallini5-Jul-07 20:16

CPallini

5-Jul-07 20:16

Regards,

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.

Re: Hey Tom, are you doing a survey?

Mark Salsbery5-Jul-07 21:12

Mark Salsbery

5-Jul-07 21:12

Or writing a book? Smile | :)

This episode brought to you by the number 5

Re: Hey Tom, are you doing a survey?

tom groezer5-Jul-07 21:17

tom groezer

5-Jul-07 21:17

Would you like to be a chief editor

Re: Hey Tom, are you doing a survey?

Mark Salsbery6-Jul-07 5:07

Mark Salsbery

6-Jul-07 5:07

As long as it doesn't require any actual work!

This episode brought to you by the number 5

Re: Hey Tom, are you doing a survey?

toxcct5-Jul-07 23:38

toxcct

5-Jul-07 23:38

check this[^]...

dumb boys never change i see... Sleepy | :zzz:

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Re: Hey Tom, are you doing a survey?

David Crow6-Jul-07 3:06

David Crow

6-Jul-07 3:06

toxcct wrote:
dumb boys...

I see no reason to resort to name-calling. If you don't agree with his practices, simply press the "ignore" button.

"A good athlete is the result of a good and worthy opponent." - David Crow

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

Re: Function-style cast

Nuxser5-Jul-07 20:47

Nuxser

5-Jul-07 20:47

http://www.warpspeed.com.au/cgi-bin/inf2html.cmd?..%5Chtml%5Cbook%5CIBMVACPP%5CCPPLNG.INF+184

Though no example but made clear points of how function-style cast behaves in C++.

Strange VC++ Debugger behavior

Axonn Echysttas5-Jul-07 19:45

Axonn Echysttas

5-Jul-07 19:45

Hi : D.

I'm running XP SP2 and Visual C++ 6 SP 6. I'm very curious about why this behavior occurs. If I call this function while I'm debugging, it works!

ExitWindowsEx(EWX_POWEROFF, 0);

But if I run the debug-built or even release-built executables from my hard disk, it does't work! Why!? This is very strange. From the debbuger, the computer starts shut down procedure, but otherwise, no way.

Thank you...

-= E C H Y S T T A S =-
The Greater Mind Balance

Blending C++ with COM ^

Re: Strange VC++ Debugger behavior

Axonn Echysttas5-Jul-07 20:25

Axonn Echysttas

5-Jul-07 20:25

Hm. Found my own answer in the meantime. Apparently, the VC++ IDE has administrator privileges. If you're a little program like me, check this out:

http://msdn2.microsoft.com/en-us/library/aa376868.aspx (see SE_SHUTDOWN_NAME)
http://msdn2.microsoft.com/en-us/library/aa375202.aspx

...and for a nice example...

http://msdn2.microsoft.com/en-us/library/aa376871.aspx

-= E C H Y S T T A S =-
The Greater Mind Balance

Blending C++ with COM ^

Re: Strange VC++ Debugger behavior

CPallini5-Jul-07 20:26

CPallini

5-Jul-07 20:26

Privileges, mon ami, privileges (I suppose...)! Big Grin | :-D

MSDN [^] states

To shut down or restart the system, the calling process must use the AdjustTokenPrivileges function to enable the SE_SHUTDOWN_NAME privilege. For more information, see Running with Special Privileges.

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.

Re: Strange VC++ Debugger behavior

Axonn Echysttas5-Jul-07 20:59

Axonn Echysttas

5-Jul-07 20:59

We replied in the same time : D.

Thank you anyway! Appreciated.

-= E C H Y S T T A S =-
The Greater Mind Balance

Blending C++ with COM ^

But you had an advantage...

CPallini5-Jul-07 22:14

CPallini

5-Jul-07 22:14

You hadn't to read the OP.
Big Grin | :-D

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.

Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

aaaan5-Jul-07 18:45

aaaan

5-Jul-07 18:45

Hi!
I m working on a database project in which i use CDaoDatabase class of MFC
to create the connection with a Access .mdb file by using its open()
function. and then use CDaoQueryDef class to save the query in the database.
It works well when I run my program first time for a database but if I
select the another or same Access .mdb file without closing the exe of my project it give error in its open
function. the error msg is somthing like this-> Unhandled exception in
myProject.exe(DAO360.DLL):0xc0000005:Access violation.

Pls help me to solve this problem as early as possible.

Ansh

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access [modified]

Mark Salsbery5-Jul-07 18:56

Mark Salsbery

5-Jul-07 18:56

Maybe try wrapping methods that can throw exceptions in try/catch blocks.
Then you can get detailed error info.

try
{
...try database open
}
catch (CDaoException *e)
{
... examine exception/error info here
e->Delete();
}

*EDIT* Besides checking for exceptions - are the string pointers you pass to Open() valid?<br />
(Thanks Steve!)

Mark

-- modified at 1:41 Friday 6th July, 2007

Mark Salsbery
Microsoft MVP - Visual C++

"Go that way, really fast. If something gets in your way, turn."

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

Stephen Hewitt5-Jul-07 19:31

Stephen Hewitt

5-Jul-07 19:31

It looks like the exception was an access violation and so your code will not catch it.

Steve

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

Mark Salsbery5-Jul-07 19:37

Mark Salsbery

5-Jul-07 19:37

Thanks

Mark Salsbery
Microsoft MVP - Visual C++

"Go that way, really fast. If something gets in your way, turn."

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

aaaan5-Jul-07 20:24

aaaan

5-Jul-07 20:24

i use try wrapping method bt it unale to track the error.
Acctually wn i debug my program and track all steps then i watch that wn the open function of CDaoDatabase class is called like this->
void CDaoDatabase::Open(LPCTSTR lpszName, BOOL bExclusive,
BOOL bReadOnly, LPCTSTR lpszConnect)
{
----
----
DAO_CHECK(m_pWorkspace->m_pDAOWorkspace->OpenDatabase(
V_BSTR(&var),
COleVariant((long)bExclusive, VT_BOOL),
COleVariant((long)bReadOnly, VT_BOOL),
COleVariant(lpszConnect, VT_BSTRT),
&m_pDAODatabase));

}
and wn the function DAO_CHECK is called it through the exceptions.

Ansh

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

Mark Salsbery5-Jul-07 21:11

Mark Salsbery

5-Jul-07 21:11

What are the values and contents of lpszName and lpszConnect?

Mark

This episode brought to you by the number 5

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

aaaan5-Jul-07 22:51

aaaan

5-Jul-07 22:51

lpszName the path of the mdb file is displayed and the lpszConnect stores 0.

Ansh

Re: Error in open() function in CDaoDatabase class of MFC-> Unhandled exception in myProject.exe(DAO360.DLL):0xc0000005:Access

Mark Salsbery6-Jul-07 5:22

Mark Salsbery

6-Jul-07 5:22

aaaan wrote:
and the lpszConnect stores 0

I'm not sure a NULL pointer is allowed there.

Instead of 0, try passing _T("")

Mark

This episode brought to you by the number 5

JPEG image creation

Md. Ali Naser Khan5-Jul-07 18:16

Md. Ali Naser Khan

5-Jul-07 18:16

I have a buffer of LPBYTE type. How can I generate JPEG file from this bufer?
Mainly I need the information that must be written to the JPEG file.

Re: JPEG image creation

Stephen Hewitt5-Jul-07 18:20

Stephen Hewitt

5-Jul-07 18:20

What is the format of the data in your buffer? If it's already a JPG file you simply need to write out its contents. If it's not already a JPG you'll need to convert it. You haven't given enough information for more detailed instructions.

Steve

Re: JPEG image creation

Md. Ali Naser Khan5-Jul-07 18:47

Md. Ali Naser Khan

5-Jul-07 18:47

I have no JPEG image. I want to create a new JPEG image.

I have a buffer containing core data.
/// Code
LPBYTE m_pPhotoBuffer;
m_pPhotoBuffer = new BYTE[height*width*3];
memcpy(m_pPhotoBuffer,(LPBYTE)lParam, height*width*3);
////
Now I have a camera recieved data in m_pPhotoBuffer.
I want to create a fresh JPEG file from this data.

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