SetDiBitsToDevice() - C / C++ / MFC Discussion Boards

Re: puzzled by the following calss defination

Cedric Moonen6-Nov-06 3:37

6-Nov-06 3:37

cy163@hotmail.com wrote:
Can we treat 'm_pCalcNext', 'm_pCalcFinished' 'm_pTerminateThread' and 'm_iCurrentPrime' as four member variables of public type of the class

Why public ? They are private pointers which are instancied in the constructor (at the line you don't understand). Each of this pointers is a pointer to a CEvent class, and a CEvent class require two parameters for its constructor (I didn't look in detail, but it seems by seing the line you posted).

In fact this part of the line: m_pCalcNext( new CEvent( FALSE, FALSE ) ) is more or less equal to m_pCalcNext = new CEvent(FALSE,FALSE); in the body of the constructor.

So what do you don't understand exactly ?

Cédric Moonen
Software developer

Charting control [Updated - v1.1]

Re: puzzled by the following calss defination

led mike6-Nov-06 4:24

led mike

6-Nov-06 4:24

Cedric Moonen wrote:
is more or less equal to

I'm not sure that I agree with your analysis.

m_pCalcNext( new CEvent(FALSE,FALSE))

is calling a constructor of whatever class m_pCalcNext is. The code posted is using the C++ Initialization List to call constructor of non-pointer member variables, and the same for the others.

led mike

Re: puzzled by the following calss defination

Cedric Moonen6-Nov-06 4:38

Cedric Moonen

6-Nov-06 4:38

led mike wrote:
is calling a constructor of whatever class m_pCalcNext is

m_pCalcNext is a pointer to a CEvent object.

So this line: m_pCalcNext( new CEvent(FALSE,FALSE))creates a new instance of the CEvent class, the same way as m_pCalcNext = new CEvent(FALSE,FALSE);

The difference is that here it is in the initialization list and not in the constructor body (that's why I said more or less).

Cédric Moonen
Software developer

Charting control [Updated - v1.1]

Re: puzzled by the following calss defination

led mike6-Nov-06 4:54

led mike

6-Nov-06 4:54

Cedric Moonen wrote:
m_pCalcNext is a pointer to a CEvent object.

Ahhh , didn't look at the link... my bad. Here is one for GWB.... "I was wrong" ... hear that GWB it's not that hard to do you [bleep][bleep][bleep][bleep].

led mike

Re: puzzled by the following calss defination

toxcct6-Nov-06 5:03

toxcct

6-Nov-06 5:03

Use the <pre></pre> tag to format your code Suspicious | :suss:

You don't know where to start ? ask a good friend

[VisualCalc 3.0][Flags Beginner's Guide]

Entrypoint problem in my project

Raghavendra Pise6-Nov-06 3:12

Raghavendra Pise

6-Nov-06 3:12

Please anyone tell me which Entry point(Link->output->Entrypoint) should i use to create a _MBCS(Preproccessor defintion) Project?

Re: Entrypoint problem in my project

Mark Salsbery6-Nov-06 6:55

Mark Salsbery

6-Nov-06 6:55

WinMain() ?

SetDiBitsToDevice()

Waldermort6-Nov-06 3:06

Waldermort

6-Nov-06 3:06

I making a call to SetDIBitsToDevice() specifying a smaller width and height than the actual DIB section. The trouble is the image is always drawn bottom up. ie the bottom edge of the image is locked to the bottom of the specified rectangle. Could somebody please tell me how to draw the image correctly from the top down?

Re: SetDiBitsToDevice()

C^hris L^osinger6-Nov-06 3:19

C^hris L^osinger

6-Nov-06 3:19

with most DIB funcitons, you can just give a negative value for DIB height, to flip the output.

it's worth a try..

image processing | blogging

Re: SetDiBitsToDevice()

Waldermort6-Nov-06 3:35

Waldermort

6-Nov-06 3:35

I tried, without success Frown | :(

, I also tried modifying the other params and creating the DIB with a negative height, but so far nothing has worked.

Here is the function call.

SIZE size = { _x2 - _x1, _y2 - _y1 };
//  SIZE size = GetSize();
    POINT SrcOrigin = {0,0};
    ::SetDIBitsToDevice(
        hdc, 
        _x1, _y1, 
        size.cx, size.cy,
        SrcOrigin.x, SrcOrigin.y,
        SrcOrigin.y, size.cy - SrcOrigin.y, 
        m_ppvBits, m_DIBinfo, 
        m_iColorDataType );

If I swap the commented line, it works fine, but it draws the full sized bitmap which is not what I want.

Re: SetDiBitsToDevice()

Waldermort6-Nov-06 4:11

Waldermort

6-Nov-06 4:11

No matter, I managed to get it working correctly.

SIZE size = GetSize();
POINT SrcOrigin = {0,size.cy - (_y2-_y1) };
::SetDIBitsToDevice(
    hdc, 
    _x1, _y1, 
    _x2-_x1, _y2-_y1,
    SrcOrigin.x, SrcOrigin.y,
    0, size.cy, 
    m_ppvBits, m_DIBinfo, 
    m_iColorDataType );

seems I had some of the paramaters a little messed up.

how to call a function a scheduled time?

Banks K6-Nov-06 3:03

Banks K

6-Nov-06 3:03

now i am able to execute a exe at scheduled time.

but i have to call a function at scheduled time.

suppose a service starts and at scheduled time, can i call a function of that service which is allready running by using task scheduler.

if any have idea please share with me.

thanks & regards
bankey

Re: how to call a function a scheduled time?

benjymous6-Nov-06 3:24

benjymous

6-Nov-06 3:24

It sounds like you want two exes

A) Your service
B) A helper app that sends a message to (A) and tells it to perform its function

The two can talk using inter process communication[^]

--
Help me! I'm turning into a grapefruit!
Buzzwords!

Re: how to call a function a scheduled time?

David Crow6-Nov-06 3:59

David Crow

6-Nov-06 3:59

Banks K wrote:
but i have to call a function at scheduled time.

Set up a timer via SetTimer(). As each WM_TIMER message is received, check the current time with the scheduled time. If they match, call the function.

Banks K wrote:
...can i call a function of that service which is allready running by using task scheduler.

No.

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

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

Re: how to call a function a scheduled time?

led mike6-Nov-06 4:27

led mike

6-Nov-06 4:27

Banks K wrote:
at scheduled time, can i call a function of that service which is allready running by using task scheduler.

I don't understand. A "service which is allready running" would be a process. One process cannot "call functions" in another process. Please be specific when asking questions so we have any clue how to answer.

led mike

Re: how to call a function a scheduled time?

prasad_som6-Nov-06 19:05

prasad_som

6-Nov-06 19:05

Banks K wrote:
suppose a service starts and at scheduled time, can i call a function of that service which is allready running

For this you need to have interfaces exposed on that service.

Banks K wrote:
by using task scheduler.

AFIK, taskscheduled runs only executables at scheduled time. You can access interfaces exposed by service in an executables, call required functions and schedule that exe using task schedular.

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

Re: how to call a function a scheduled time?

Blake Miller7-Nov-06 3:53

Blake Miller

7-Nov-06 3:53

If the service can know when to execute the function, then look into using:
The SetWaitableTimer function activates the specified waitable timer. When the due time arrives, the timer is signaled and the thread that set the timer calls the optional completion routine.

Any sufficiently gross incompetence is nearly indistinguishable from malice.

Please help !

Bravoone_20066-Nov-06 3:01

Bravoone_2006

6-Nov-06 3:01

iHave a CDialog and i want to start my dialog maximized how ? because my dialog is minimized it is small and i don t want to push the buton "maximized" !
Smile | :)

Bravoone

Re: Please help !

pgirish6-Nov-06 3:58

pgirish

6-Nov-06 3:58

During Creation Override OnInitDialog function and
add this ModifyStyle(0, WS_MAXIMIZE); to your code.

Like

void CMyDialog::OnInitDialog()
{
CDialog::OnInitDialog();
ModifyStyle(0, WS_MAXIMIZE);
}

Re: Please help !

Hamid_RT6-Nov-06 18:32

Hamid_RT

6-Nov-06 18:32

You can use of ShowWindow(SW_MAXIMIZE)

WhiteSky

Re: Please help !

Bravoone_20066-Nov-06 19:22

Bravoone_2006

6-Nov-06 19:22

THANKS GUYS !!!!
ShowWindow(SW_MAXIMIZE) IS WORKING !!!!
Smile | :)

Bravoone

Re: Please help !

Hamid_RT6-Nov-06 20:27

Hamid_RT

6-Nov-06 20:27

Glad you found it Smile | :)

WhiteSky

Copy to clipboard problem.

rrrado6-Nov-06 2:50

rrrado

6-Nov-06 2:50

I need to copy some string to the clipboard.
This is the code I use:

handle = GlobalAlloc(GMEM_MOVEABLE,text.GetLength()+1);
if (handle)
{
    if (OpenClipboard(hWnd) && EmptyClipboard() )
    {
        out = (char*)GlobalLock(handle);
                    // this fails sometimes (out=NULL)

My code sometimes fail at out = (char*)GlobalLock(handle);
GlobalLock returns NULL and GetLastError() = 6 (invalid handle).

Any ideas why ?
Is there more reliable code for copying to clipboard ?

Thank you!

rrrado

Re: Copy to clipboard problem.

cje6-Nov-06 9:40

cje

6-Nov-06 9:40

I ran across the following code in one of our projects - not sure if it will help you or not

<br />
HGLOBAL hData = 0;<br />
// open memory file<br />
CSharedFile clipb (GMEM_MOVEABLE|GMEM_DDESHARE|GMEM_ZEROINIT);<br />
clipb.Write(cstrString, cstrString.GetLength()*sizeof(TCHAR));<br />
clipb.Write(_T("\0"), sizeof(TCHAR));<br />
hData = clipb.Detach();<br />
// Now, hand over memory block to clipboard<br />
if (hData)<br />
{<br />
   VERIFY(OpenClipboard());<br />
   SetClipboardData(CF_TEXT, hData);<br />
   VERIFY(CloseClipboard());<br />
}<br />

cje

Re: Copy to clipboard problem.

rrrado7-Nov-06 21:21

rrrado

7-Nov-06 21:21

Thank you. I think I've fouind the problem - I was releasing the memory after SetClipboardData which caused the problems.

rrrado

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