C / C++ / MFC

Re: How can I use LoadBitmap() for loading a bitmap ON button

28-Dec-05 22:10

Are you trying this in a dialog.

Do you already have a button. If so then you have to add a member variable for that button with type as CBitmapButton and then use AutoLoad(). And don't forget to set the ownerdrawn property to true.

m_YourBmpButton.AutoLoad(IDC_MYBUTTON, this);

and then set the images.

Perhaps you may not have to call AutoLoad(...) if you are adding a member variable.

Jesus Loves You and Me Smile | :)

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Identity Undisclosed28-Dec-05 22:30

Identity Undisclosed

28-Dec-05 22:30

The problem is that since u r creating button in a function, so it will be allocated on stack. and as the function is returned back ,where u are creating a button, all items are pop out of the stack. So ur button will no longer exists. Either u make it(myButton) member of class or Create the CBitmapButton object on Heap.

The code for creating on Heap is:

<br />
CBitmapButton* myButton = new CBitmapButton;<br />
myButton->Create(NULL, WS_CHILD|WS_VISIBLE|BS_OWNERDRAW, CRect(10,10,100,100), this, 1);<br />
// Load the bitmaps for this button.<br />
myButton->LoadBitmaps(IDB_UPU, IDB_DOWND, IDB_FOCUSF, IDB_DISABLEX)<br />

Plus u must call delete in ur destructor or the entry after the button is not required.

It hope it helps :P

-- modified at 4:33 Thursday 29th December, 2005

Re: How can I use LoadBitmap() for loading a bitmap ON button

Saday Sarkar28-Dec-05 22:51

Saday Sarkar

28-Dec-05 22:51

Ok I've got .
Very very Thanks

Re: How can I use LoadBitmap() for loading a bitmap ON button

Saday Sarkar28-Dec-05 22:45

Saday Sarkar

28-Dec-05 22:45

Still now I'm not geting the result.
PLz help.
I am using dialog base.
I take a button.
Then create member m_button of the button.
------------------------------------------------------------------
CBitmapButton m_button;//at constractor
-------------------------------------------------------------------
DDX_Control(pDX, IDC_BUTTON1, m_button);(at DoDataExchange)
-------------------------------------------------------------------
I've import bitmaps mamed IDB_UP, IDB_DOWN, IDB_FOCUS, IDB_DISABLE
then using ....
-------------------------------------------------------------------
m_button.LoadBitmaps("IDB_UPU", "IDB_DOWND", "IDB_FOCUSF", "IDB_DISABLEX");
-----------------------------------------------------------------------
Q1> How can i give the property "WS_CHILD|WS_VISIBLE|BS_OWNERDRAW".
Q2> If i use Autoload() then how i can give names of Bitmaps?

Very Very thanks.

Re: How can I use LoadBitmap() for loading a bitmap ON button

Owner drawn28-Dec-05 23:02

Re: How can I use LoadBitmap() for loading a bitmap ON button

28-Dec-05 23:02

Saday Sarkar wrote:
CBitmapButton m_button;//at constractor

What's this.

You declared m_button in the constructor. You must do it in the header file.

using AutoLoad is easy. But I don't think you will need it. But any way here it is.

m_button.AutoLoad(IDC_BUTTON1, this/*parent window*/);

m_button.SetBitmaps(..........)

This should work.

Make sure that the button in the dialog has the ownerdrawn property set to TRUE

Jesus Loves You and Me Smile | :)

Saday Sarkar28-Dec-05 23:36

Saday Sarkar

28-Dec-05 23:36

Yes I've got.
I've not do"the button in the dialog has the ownerdrawn property set to TRUE "
Now ok.
Very Very Thanks.

Re: How can I use LoadBitmap() for loading a bitmap no button

BlackDice29-Dec-05 8:53

BlackDice

29-Dec-05 8:53

I think this way is easier:

//button must have 'Bitmap' property set to true
CButton* pButton = (CButton*)GetDlgItem(IDC_VIEWSCAPS);
ASSERT(pButton);
if(pButton)
{
	VERIFY(m_bmpBSBitmap.LoadBitmap(IDB_ADD));
	HBITMAP hbmp = (HBITMAP)m_bmpBSBitmap.GetSafeHandle();
	pButton->SetBitmap(hbmp);
}

IDB_ADD is replaced with bitmap resource id
IDC_VIEWSCAPS is replaced with button resource id

make sure you set 'bitmap' property for the button to true

My articles

BlackDice

[Message Deleted]

rbofnjtu28-Dec-05 21:00

rbofnjtu

28-Dec-05 21:00

[Message Deleted]

Re: Would you please recommend some books?

QuickDeveloper28-Dec-05 21:56

QuickDeveloper

28-Dec-05 21:56

Programming Windows With MFC- by Jeff Prosise
Programming Windows by Charles Petzold
Programming Microsoft Visual C++ by -David Kruglinski ,Scot Wingo ,George Shepherd

hope that helps.. Smile | :)

QuickDeveloper28-Dec-05 22:15

QuickDeveloper

28-Dec-05 22:15

y did u delete the message?

Prakash Nadar28-Dec-05 22:24

28-Dec-05 22:24

may be he thought that since he got his answer he should delete the message :P

-Prakash

ThatsAlok28-Dec-05 22:28

ThatsAlok

28-Dec-05 22:28

vamshin wrote:
y did u delete the message?

he don't want to share this info with other WTF | :WTF:

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Owner drawn28-Dec-05 22:34

Why one WM_CHAR is hooked twice when install a WH_GETMESSAGE hook?

28-Dec-05 22:34

Got lost

Jesus Loves You and Me Smile | :)

followait28-Dec-05 20:57

followait

28-Dec-05 20:57

Why one WM_CHAR is hooked twice when install a WH_GETMESSAGE hook?

Re: Why one WM_CHAR is hooked twice when install a WH_GETMESSAGE hook?

Owner drawn28-Dec-05 21:31

problem in the *.bmp of the clipboard

28-Dec-05 21:31

Could be one for your thread and one for the system.

Hence two.

Jesus Loves You and Me Smile | :)

greenapplezlp28-Dec-05 20:49

greenapplezlp

28-Dec-05 20:49

I have a question of the *.bmp of the clipboard.
I want to attain the Gray value of the *.bmp in clipboard.but I fail!How to get the Gray value?
help me,please! thank you very much!

greenapplezlp

-- modified at 3:00 Thursday 29th December, 2005

Re: problem in the *.bmp of the clipboard

Identity Undisclosed29-Dec-05 1:55

Identity Undisclosed

29-Dec-05 1:55

You can simply use the below formula
Gray = (r*11 + g*16 + b*5)/32.

Get every Pixel and set it colors with the help of this formula.
I hope u get the basic !!!

Upcasting &amp; Downcasting naming jargon ?

Identity Undisclosed28-Dec-05 20:42

Identity Undisclosed

28-Dec-05 20:42

Well I am a little confused with naming jargon of casting.
My intended goal was:
CBase* pBase = static_cast<CBase*>(derived);

What is it called upcasting/downcasting ?

The below articles says it is upcasting:
http://www.codeproject.com/managedcpp/castingbasics.asp

While in MSDN they interpret as downcasting:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_mfc_static_downcast.asp

Which one is correct ?

-- modified at 2:44 Thursday 29th December, 2005

Re: Upcasting &amp;amp; Downcasting naming jargon ?

GDavy28-Dec-05 22:03

GDavy

28-Dec-05 22:03

Look at the class-hierarchy as an upside-down piramide.
When you cast to a base-class you cast down in the hierarchy -> downcast
When you cast to a derived class you cast up in the hierarchy -> upcast.

Hope this clears it up somewhat for you...
Greetz,
Davy

Re: Upcasting &amp;amp;amp; Downcasting naming jargon ?

Prakash Nadar28-Dec-05 22:20

Re: Upcasting &amp;amp;amp;amp; Downcasting naming jargon ?

28-Dec-05 22:20

GDavy wrote:
Look at the class-hierarchy as an upside-down piramide.

I agree with that, but different ppl should not have different way of representing a inheritance.

base
^
|
Derived

Microsoft always follows this notation in their documentation, so upcasting should have been the rite notation to use.

-Prakash

GDavy28-Dec-05 23:12

GDavy

28-Dec-05 23:12

Mr.Prakash wrote:
base
^
|
Derived

Microsoft always follows this notation in their documentation

yeah, you're right about that. I think the people writing those documents had problems with the concept of an upside-down piramide.

But I still have to disagree with your definition of down-cast / up-cast...

Here's another analogy (a better one perhaps?)->look at it as a tree (but only the part from the ground and up, skip the roots);).
the base-class is the trunk and all derived classes are the branches. Like a family tree.

I see an up-cast as an upgrade -> extra functionality, more specific so from base to derived class.
a down-cast is down-grade-> less functionality, more general handling so from derived to base class.

Re: Upcasting &amp;amp;amp;amp;amp; Downcasting naming jargon ?

Prakash Nadar29-Dec-05 4:54

Re: Upcasting &amp;amp; Downcasting naming jargon ?

29-Dec-05 4:54

GDavy wrote:
Here's another analogy (a better one perhaps?)->look at it as a tree (but only the part from the ground and up, skip the roots).
the base-class is the trunk and all derived classes are the branches. Like a family tree.

I agree with your analogy, but microsoft should follow the standard notation used for derivation IMHO Smile | :)

-Prakash

Prakash Nadar28-Dec-05 22:11