C / C++ / MFC Discussion Boards

AbhiHcl15-Jul-10 0:33

15-Jul-10 0:33

Hi Have created a Editbox derived from CEdit and a spin control. The editbox is attached with Spin control. There should be time value in Edit box and the value (hr ,min ,AM/PM) should increase or decrease according to up and Down arrow of the spin control. Can anyone plese help me how to increse or deecrease the particular selection using spin control.

any help is appriciated..

Thanks..

Re: Edit Control

Naveen15-Jul-10 1:37

Naveen

15-Jul-10 1:37

Why dont you use the DateTimeControl instead of edit box?

nave

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Re: Edit Control

AbhiHcl15-Jul-10 2:00

AbhiHcl

15-Jul-10 2:00

I need to customiza the control. There will be some image on up and down arrow of the spin control and also some gradient effect shud be there in edit box.
Is these thigs are possibe in datetimeControl ? if ys then please guide me hw to do ?
Thanks..

Re: Edit Control

Naveen15-Jul-10 2:08

Naveen

15-Jul-10 2:08

AbhiHcl wrote:
There will be some image on up and down arrow of the spin control

If you have customised a normal spin control, you can customise, the spin in the Date time picker also. The spin control is actually a child of the Date time picker and you can get the handle of that spin control like HWND hSpin = GetWindow( hDateTimerPicker, GW_CHILD ); . Then you can subclass it.

AbhiHcl wrote:
and also some gradient effect shud be there in edit box.

How did you plan to do that? Try the same will work in Date time picker also..

nave

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Re: Edit Control

AbhiHcl15-Jul-10 2:33

AbhiHcl

15-Jul-10 2:33

GetWindow() takes only one parameter as HWnd. I m not clear how to proceed..

Can u plz send me some sample code..plzzz...

Re: Edit Control

Naveen15-Jul-10 2:40

Naveen

15-Jul-10 2:40

AbhiHcl wrote:
GetWindow() takes only one parameter as HWnd. I m not clear how to proceed..

try putting :: infront of it Wink | ;)

. ::GetWindow(...)

Sorry I dont have a sample for that now...

nave

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Re: Edit Control

Member 392263915-Jul-10 2:12

Member 3922639

15-Jul-10 2:12

To get the text portion currently selected?
See CEdit::GetSel.

Re: Edit Control

AbhiHcl15-Jul-10 2:36

AbhiHcl

15-Jul-10 2:36

CEdit::GetSel() return DWORD. and I am not sure how to convert the value as string and then iin int. bcoz I need to increment and decrement that value, what ever is selected.
Could u plz help me out for this logic.

Re: Edit Control

Richard MacCutchan15-Jul-10 4:26

Richard MacCutchan

15-Jul-10 4:26

You should make greater use of the MSDN documentation. This page[^] explains the values in the DWORD and how they may be used to get the specific characters of your edit string.

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First Chance Exception

Pryabu14-Jul-10 23:58

Pryabu

14-Jul-10 23:58

Hi,

Im getting the following error while closing handle using CloseHandle() function. Can anyone please tell how to resolve this issue?

First Chance Exception in test.exe(NTDLL.DLL):0xC0000008: Invalid Handle

Thanks,

Re: First Chance Exception

Cedric Moonen15-Jul-10 0:08

Cedric Moonen

15-Jul-10 0:08

The error message is pretty clear no ? You are passing an invalid handle to the CloseHandle function. Use your debugger inspect what might be wrong.

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Re: First Chance Exception

Pryabu15-Jul-10 0:16

Pryabu

15-Jul-10 0:16

no.In that folder,im having a image file and Using FindFirstFile function i got handle for that image file. After trying to close that handle the application is getting crashed and it is showing this error.

wsprintf(szSearchFolder,"%s\\*.jpg","C:\\test");

hSearch = FindFirstFile (szSearchFolder, &Foldername);

if (hSearch == INVALID_HANDLE_VALUE)
{
return ERR_FAILED;
}

CloseHandle(hSearch);

Re: First Chance Exception

Naveen15-Jul-10 1:35

Naveen

15-Jul-10 1:35

Karthika85 wrote:
CloseHandle(hSearch);

This is wrong. You should use FindClose() function to close the handle retured by FindFirstFile()

nave

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Re: First Chance Exception

Aescleal15-Jul-10 0:26

Aescleal

15-Jul-10 0:26

As Cedric said, you're passing an invalid handle to the function. Just because the value of the handle isn't INVALID_HANDLE_VALUE it doesn't mean the handle is valid. For example you might...

- be using a handle someone else has already closed
- you're using something uninitialised that contains some rubbish off the stack
- you're overwriting the variable containing the HANDLE value with a wild pointer write
- be doing something really perverse like HANDLE h( reinterpret_cast<HANDLE>( std::rand() ) );

So there's loads of ways a HANDLE can be invalid and not have a value of INVALID_HANDLE_VALUE.

Cheers,

Ash

Re: First Chance Exception

Pryabu15-Jul-10 1:03

Pryabu

15-Jul-10 1:03

I have intialized the handle value to NULL in the declaration.

HANDLE hSearch = NULL;

Re: First Chance Exception

Niklas L15-Jul-10 0:34

Niklas L

15-Jul-10 0:34

How about using FindClose()[^] as the documentation suggests instead of CloseHandle()?

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Set a timeout for UrlDownloadToFile() ? [modified]

ALLERSLIT14-Jul-10 23:50

ALLERSLIT

14-Jul-10 23:50

Hey, well if the webserver hangs or something urldownloadtofile will keep trying to connect and somewhat hang there forever.
So iam in a need of a way to set a timeout for it, so itll stop executing after a set amount of time.
Maybe you guys have any idea how i could realise that?

And yes i do know winsock/wininet etc would be better but iam trying to learn my way up with easier functions for now Smile | :)

.
Thanks

modified on Thursday, July 15, 2010 5:57 AM

Re: Set a timeout for UrlDownloadToFile() ?

Niklas L15-Jul-10 0:43

Niklas L

15-Jul-10 0:43

Have you tried using the callback (last parameter) and return E_ABORT? That should probably be sufficient for you.

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Re: Set a timeout for UrlDownloadToFile() ?

ALLERSLIT15-Jul-10 0:47

ALLERSLIT

15-Jul-10 0:47

Well the program is stuck because the function URLDownloadToFile() wont stop executing if the destinationserver hangs so i cant do anything.

Re: Set a timeout for UrlDownloadToFile() ?

Niklas L15-Jul-10 0:52

Niklas L

15-Jul-10 0:52

Once more: Have you tried what I suggested?

Here's a crazy thought: what if the callback is called back from the function repeatedly to allow you to monitor progress? And what if returning E_ABORT from that function will terminate the download attempt?

I know it's crazy, but you're allowed to be a little crazy on Thursdays.

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Re: Set a timeout for UrlDownloadToFile() ?

Moak15-Jul-10 7:38

Moak

15-Jul-10 7:38

If this API doesn't provide a timeout how about using an alternative? Use a HTTP client library (Alhem, Boost, IP*Works, Poco, Sharkengine) or one of the Windows HTTP APIs, e.g. WinHTTP (MSDN), Asynchronous WinHTTP Library (CodeProject).

See if it helps Smile | :)

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_tfopen Error - file is being used by another process.

Cvaji14-Jul-10 23:20

Cvaji

14-Jul-10 23:20

Hi All,

I am using _tfopen to read a specific file which will be accessed by multiple process simultaneously. This time _tfopen function getting failed and GetLastError() is returning the following error.

"The process cannot access the file because it is being used by another process."

This is how i called the function

_tfopen( csFileName_i.operator LPCTSTR(), _T( "rb" ))

I need to open the same file simultaneously by different process.
Please help me.

-Cvaji

Re: _tfopen Error - file is being used by another process.

Richard MacCutchan15-Jul-10 2:12

Richard MacCutchan

15-Jul-10 2:12

Try using _fsopen[^] which allows file sharing.

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Enum Issue

VC_RYK14-Jul-10 23:16

VC_RYK

14-Jul-10 23:16

Hi Experts

I am migrating one project from Vc 6.0 to Vc 8.0. I found one compilation Error regarding Enum.

In Vc 6.0 they have declared an enum in a class and again the same enum they are using in other class with scope resolution and have changed the enum value. It is compiling fine on Vc 6.0 but throwing an error while compiling in Vc 8.0.

Example code.

class CTest
{
public:
enum TestEnum {NA=0, First};
};

class CTest1
{
public:
enum CTest::TestEnum {Second, Third};

};

It is working fine in Vc 6.0 but throwing error in Vc 8.0
Error is:- error C2911: 'CTest::TestEnum' : cannot be declared or defined in the current scope

Re: Enum Issue

Aescleal14-Jul-10 23:51

Aescleal

14-Jul-10 23:51

Listen to the compiler - the VC++ handling of enums changed significantly in either 2002 or 2003 - the code that compiled under VC++6 is just plain wrong, you can't open up enums and extend them the way you can namespaces.

All Microsoft compilers have a breaking changes document, have a look in that to see what else has changed and going to trip you up.

Ash

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