Double Buffering? - C / C++ / MFC Discussion Boards

Re: Own window in dialog

toxcct5-Jun-06 1:29

toxcct

5-Jun-06 1:29

here[^]

look the subclassing and ownerdrawing articles.

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: Own window in dialog

David Crow5-Jun-06 3:19

David Crow

5-Jun-06 3:19

Manjunath S wrote:
I want to create my own class and register it...

Use AfxRegisterWndClass() or AfxRegisterClass().

Manjunath S wrote:
I want to create a window On my dialog using my registered class in Dialog Based Application..

See CWnd::Create() method.

"The largest fire starts but with the smallest spark." - David Crow

Re: Own window in dialog

Manjunath S5-Jun-06 4:57

Manjunath S

5-Jun-06 4:57

can i get sample code regarding creating our own window in dialog based appllication ..

Manjunath S
GESL
Bangalore

Re: Own window in dialog

David Crow5-Jun-06 5:12

David Crow

5-Jun-06 5:12

See here.

"The largest fire starts but with the smallest spark." - David Crow

ADO - UPDATE -newbie

antonaras5-Jun-06 1:08

antonaras

5-Jun-06 1:08

Hi again i wrote this function to update a record in access using ADO but i get an error can anyone find out whats wrong

int valField5;
int valField2;
double valField4;
string command;
_bstr_t strtest=valField4;

pCommand->ActiveConnection = m_pConn;//previously opened connection
command="UPDATE tblDictionary SET Spam="+valField2;
command+=",Pos="+strtest;//when i write pos="valField4; i get compilation error
command+=",app="+valField5;
command+=" WHERE token='"+ token;
command+="'";

_bstr_t strSQLstatment=command.c_str();
variant_t vntRecordAffected;
m_pConn->Execute(strSQLstatment,&vntRecordAffected,adCmdText);

It compiles ok but then i get an error

Error:Θï█
Press any key to continue

i know my question is not very clear but if u can see anything that might cause the error pls let me know.

is it because i'm not giving the values for all columns of the record
in the database table i have
token text
Spam number
Ham number
Pos number(with decimal)
app number
i only try to update some values is that correct

thanks again

Re: ADO - UPDATE -newbie [modified]

Eytukan5-Jun-06 1:20

Eytukan

5-Jun-06 1:20

Please Display! the error properly.

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-- modified at 7:25 Monday 5th June, 2006

Re: ADO - UPDATE -newbie

David Crow5-Jun-06 3:33

David Crow

5-Jun-06 3:33

antonaras wrote:
command+=",Pos="+strtest;//when i write pos="valField4; i get compilation error

Have you tried:

command += ",Pos=";
command += valField4;

"The largest fire starts but with the smallest spark." - David Crow

Double Buffering?

Sarath C5-Jun-06 1:05

Sarath C

5-Jun-06 1:05

For drawing, we are using double buffering. i.e we will create a new DC and draw into it and finally bitblt to the screen.
Why we are not getting the flickering On BitBlt ing the memory DC?

Can we adopt any other method to avoid flickering.

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Re: Double Buffering?

Nishad S5-Jun-06 1:37

Nishad S

5-Jun-06 1:37

When you are using double buffering method, the drawings are done in the memory DC, which is not seen to us. Then you BitBlt it to the screen DC. The BitBlt is a very fast operation and there is no erasing. Means the content in the memory DC is overwritten to existing screen content. So you will see a full image after the BitBlt.
But if you are drawing directly to the screen, for example, you may have to clear the screen and draw something and then draw something over it, etc. As all these operations are visible to us, we feel it as flickering. But in the case of double buffering, these are done in the memory DC, which is hidden from us, and the final result is shown immediately, replacing the existing one.

I think you got it. Smile | :)

- NS -

Re: Double Buffering?

Sarath C5-Jun-06 2:14

Sarath C

5-Jun-06 2:14

Yes dear thanks alot.

NS17 wrote:
The BitBlt is a very fast operation and there is no erasing. Means the content in the memory DC is overwritten to existing screen content. So you will see a full image after the BitBlt.

I had doubt only in this matter. Smile | :)

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Re: Double Buffering?

Divyang Mithaiwala5-Jun-06 2:34

Divyang Mithaiwala

5-Jun-06 2:34

Hello SaRath,

Yes, I agree with NS17. When you are doing bitblt your OS (as it is system call) will do mass edit of pixel. But when you do this for every pixel your function is call stack process is do and take some time. While for bitblt all pixel changes injust one call.

Divyang Mithaiwala
System Engineer & Software Developer

Please help me

subramanyeswari5-Jun-06 0:45

subramanyeswari

5-Jun-06 0:45

I am running my application in msvc6.0 winxp sp2. I am able to compile it successfully but unable to run it. it is giving error
"Failed to initialize properly 0xc0150002" is coming.

Thanks in advance

Re: Please help me

Eytukan5-Jun-06 0:55

Eytukan

5-Jun-06 0:55

First try it in Debug mode and use the debugger. With this message no one can help you Frown | :(

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Re: Please help me

subramanyeswari5-Jun-06 1:15

subramanyeswari

5-Jun-06 1:15

I tried with debugger by keeping breakpoint. but it is not reaching any of the breakpoints in the application. As soon as i hit debugger it is giving the that error message. Is there any latest version of SP that i need to install for msvc to run under winxp sp2?

Re: Please help me

Eytukan5-Jun-06 1:17

Eytukan

5-Jun-06 1:17

Does this happen for any project you create? even for a win32 console application?

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Re: Please help me

subramanyeswari5-Jun-06 1:24

subramanyeswari

5-Jun-06 1:24

I did not try.. I will try now

Re: Please help me

subramanyeswari5-Jun-06 1:30

subramanyeswari

5-Jun-06 1:30

No it's not coming. it is working fine. Do i need to check any settings for my application.

Regards

Re: Please help me

toxcct5-Jun-06 1:32

toxcct

5-Jun-06 1:32

you certainly have a memory violation due to some bad pointers handling.

see my other post and read the article Wink | ;)

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: Please help me [modified]

Sarath C5-Jun-06 1:01

Sarath C

5-Jun-06 1:01

we are all using MS VC 6.0 with windows Xp Sp2. there is no problem in loading or creating any application.pls check ur code first. if u haven't installed the required service pack for Visual Studio, update with new one.

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

-- modified at 7:02 Monday 5th June, 2006

Re: Please help me [modified]

Eytukan5-Jun-06 1:16

Eytukan

5-Jun-06 1:16

I guess she faces this problem in a particular application. Probably It should be her mistake. But not sure Unsure | :~

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Re: Please help me [modified]

subramanyeswari5-Jun-06 1:18

subramanyeswari

5-Jun-06 1:18

what is the sp that is to be installed for visual studio I mean we have sp6 installed. Is it not the latest one?

Regards

Re: Please help me

Anton Mikhalyov5-Jun-06 1:16

Anton Mikhalyov

5-Jun-06 1:16

I suppose that this error isn't generated by your application, it's an error from windows loader, the whole executable is damaged. If you can post this file somewhere, maybe I can help.

PS Check your linker options, the problem suppose to be here.

Re: Please help me

toxcct5-Jun-06 1:27

toxcct

5-Jun-06 1:27

Surviving the release[^]

also, set a breakpoint at the beginning of your application, and use your debugger. it's your best friend in such cases !!

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

CListCtrl - selection

Luksky5-Jun-06 0:28

Luksky

5-Jun-06 0:28

How can I have always displayed selection of an item?
When user clicks in field (inside list control), where there isn't any item, selection is disapearing - how can I prevent this?

In control properties I have "show selection always" set as TRUE.

~~~~

Re: CListCtrl - selection

Nishad S5-Jun-06 0:55

Nishad S

5-Jun-06 0:55

Map LVN_ITEMCHANGING Notification.
And try this

void CMyDlg::OnItemchangingList1(NMHDR* pNMHDR, LRESULT* pResult) 
{
    NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;
    CPoint pos(GetMessagePos());
    m_list.ScreenToClient( &pos );
    UINT uFlags = 0;
    m_list.HitTest( pos, &uFlags );
    *pResult = ( uFlags & LVHT_ONITEMLABEL ) ? FALSE : TRUE;
}

- NS -

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