Combo Box Owner Drawn - C / C++ / MFC Discussion Boards

User 98851-Apr-03 6:22

1-Apr-03 6:22

I want to change the default font of a dialog run-time. Is there a comprehensive set of procedures to follow to resize the dialog, and all the controls to accomodate the change in font metrics?

My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers

modified 29-Aug-18 21:01pm.

calling a DLL in VC++

Yank11-Apr-03 6:07

Yank1

1-Apr-03 6:07

I created a VC++ app that calls a VB created ActiveX DLL, but its returns a failure when I execute the CoCreateInstance function for the COM handle.

Re: calling a DLL in VC++

geo_m1-Apr-03 7:49

geo_m

1-Apr-03 7:49

Did you call the CoInitialize or CoInitializeEx on the beginning of your application? (every thread - including main thread of the application must have initialize the support for COM subsystem to be able to use it)

Re: calling a DLL in VC++

Anonymous1-Apr-03 8:05

Anonymous

1-Apr-03 8:05

Yes, I did call the CoInitialize at the beginning of the app. Does the CoCreateInstance work differently in NT as opposed to Win2000 because when I run my app in NT, it seems to run through this step without an error message, but in Win2000 this step generates an error

Re: calling a DLL in VC++

geo_m1-Apr-03 9:19

geo_m

1-Apr-03 9:19

normally not - what exactly the CoCreateInstance returns to you as an error - this HRESULT value?

Enumerating SCSI devices?

dandy721-Apr-03 4:51

dandy72

1-Apr-03 4:51

I need to identify any and all SCSI devices attached to a system, whether it's a scanner, CDROM, hard drive, tape drive, etc.

I've been looking at:

CreateFile( "\\.\SCSIx:", ... ); // x = some int
DeviceIoControl( ..., IOCTL_SCSI_GET_INQUIRY_DATA, ... )

...however this seems to pick up all storage devices...regardless of whether the device is truly SCSI or not (ie, it'll pick up my IDE hard drives, IDE CDROM drives and even virtual IDE CDROM drives).

None of the buffers that get filled in seem to have any indicator of being a "true" SCSI device or not...

What *is* the proper way to iterate through the "real" SCSI chain from a user-mode app written in C/C++?

Re: Enumerating SCSI devices?

FoxholeWilly28-Feb-07 8:56

FoxholeWilly

28-Feb-07 8:56

Ditto and BUMP

Combo Box Owner Drawn

Anthony98871-Apr-03 4:43

Anthony9887

1-Apr-03 4:43

I'm trying to implement the compareitem and drawitem for a combobox. The compareitem is called when I call addstring, but in the drawitem i'm not getting the correct string values. Any ideas.

Thanks

Re: Combo Box Owner Drawn

Dave Bryant1-Apr-03 9:15

Dave Bryant

1-Apr-03 9:15

Can you please be a bit more specific? What are the incorrect values you are getting, and what do you expect there? What is the code you are using to draw the item?

Dave
http://www.cloudsofheaven.org

Re: Combo Box Owner Drawn

Anthony98872-Apr-03 3:56

Anthony9887

2-Apr-03 3:56

The CompareItem Function seems to work fine. I can't get the DrawItem to display the sorted data.

void CCBX::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// TODO: Add your code to draw the specified item
ASSERT(lpDrawItemStruct->CtlType == ODT_COMBOBOX);
LPSTR lpszText = (LPSTR)lpDrawItemStruct->itemData;
CDC dc;

dc.Attach(lpDrawItemStruct->hDC);
dc.DrawText(lpszText, strlen(lpszText),
&lpDrawItemStruct->rcItem,DT_SINGLELINE);
dc.Detach();
}

Thanks

Still trying to SetFocus()

ns1-Apr-03 4:08

1-Apr-03 4:08

I want to set focus in the edit part of the combobox after I select an item from a listCtrl. SO I have in:

OnItemChanged() 
{
GoToDlgCtrl(GetDlgItem(IDC_COMBO1)->GetDlgItem(1001));

When I have the mouse button clicked down (and not yet released back up) while I am in the listCtrl making my selection, the focus does go to the combo editpart. I see the cursor blinking there. The moment I release the mouse the focus vanishes, and the item I selected looks highlighted in blue. How do I make my focus stay in the combo? I even tried postMessaging from within the ItemChanged to setFocus but that didnt do it either....

Appreciate your help,
ns

Of course I had tried the m_combo1.SetFocus() too but no go..

How to Disable F1 pass to CXXApp in pop up dialog?

cadinfo1-Apr-03 3:51

cadinfo

1-Apr-03 3:51

I need a dialog to lock my app, at the same time I locked desktop, so no one can run another app, but F1 key can not disable successfully, when I press F1, it pass through my dialog and to CxxApp, which generate WM_HELP by default, I want to avoid it in this situation, How can I do it?

BOOL CLockDlg::PreTranslateMessage(MSG* pMsg)<br />
{<br />
	if(pMsg->message==WM_KEYDOWN)<br />
	{<br />
		switch(pMsg->wParam)<br />
		{<br />
		case VK_ESCAPE: return TRUE;<br />
			<br />
// This can prevent F1 pass to main window and CXXApp:wtf:<br />
//		case VK_F1:<br />
//			MessageBox("Hello");<br />
//			break;//return TRUE;<br />
		}<br />
	}	<br />
<br />
	return CDialog::PreTranslateMessage(pMsg);<br />
}<br />

Thank you in advance.;)

Best Regards

Another Design question/comment

Maximilien1-Apr-03 2:52

Maximilien

1-Apr-03 2:52

I have a collection of independant UI components, that I can place in dialogs to build more complex dialogs.

When the data from one of the component is modified, I may need to update another component.

I don't want the components to know about other component; and each component has a pointer to its parent dialog.

so, I'm doing something like this :

...
// in the component.
void SomeDerivedComponent::SomeMethodThatChangedTheComponent()
{
 m_pParentDialog->ComponentChanged(this);
}
...
// ComponentChanged is virtual and will be re-defined in parent dialogs
// where "some interaction is needed between components.
void ParentDialogClass::ComponentChanged( ComponentBaseClass* pComponent)
{

 if ( dynamic_cast<SomeDerivedComponent>(pComponent) != NULL )
 {
   // update other component(s)
 }
}

When I update the components in the parent dialog , I only pull info from the components, I don't want to have the components send/push back info to the parent either.

Does it sound ok ?

Thanks.

Maximilien Lincourt
For success one must aquire one's self

Re: Another Design question/comment

Dave Bryant1-Apr-03 9:13

Dave Bryant

1-Apr-03 9:13

It sounds okay.

As a reference, Windows controls tend to use a mixture of the approaches. When they change, or an event occurs, they send a message to their parent (meaning that the parent does not have to implement a certain interface, but may optionally handle the notification messages, normally sent as WM_COMMAND or WM_NOTIFY). Some controls just send a message saying that something changed, like a combo box sends a message saying the selection changed, without providing any information about what the selection has changed to - you need to query it. Other controls, such as a tree control, send much more information in their notify messages, often providing all the information required (such as the previously selected item, the new item, the item state etc.).

The only change i would suggest is to change the controls from using a pointer to the parent and calling a function, to sending a custom message to the parent. This will make the controls easier to reuse in another situation, because they won't be hardcoded to use a specific parent dialog.

Dave
http://www.cloudsofheaven.org

Re: Another Design question/comment

Maximilien1-Apr-03 9:39

Maximilien

1-Apr-03 9:39

Dave Bryant wrote:
The only change i would suggest is to change the controls from using a pointer to the parent and calling a function, to sending a custom message to the parent.

I wanted to do this, but I kinda' don't like Windows that much; and the derived components, are only used in those instances.

But I will try it, since it's not a big change to what I've already done, only replace the pointer by a SendMessage(...);

I also thought of using a observer pattern but that meant too much work ...

Thanks
Max.

Maximilien Lincourt
For success one must aquire one's self

Add more functions for ListBox control?

chen1-Apr-03 2:51

chen

1-Apr-03 2:51

Hi,

In adialog based application, i have a listbox for showing some
info data. Now i want to know how to add "PageUp" and "PageDown"
functions in the listbox? How to do this? Is there any reference about this?

Thanks in advance!

chen

Re: Add more functions for ListBox control?

Dave Bryant1-Apr-03 9:07

Dave Bryant

1-Apr-03 9:07

Try sending a WM_VSCROLL message to the list box (see MSDN for details on what WPARAM and LPARAM are - i can't remember off the top of my head).

Dave
http://www.cloudsofheaven.org

How to prevent IE from caching files

sanskypotov1-Apr-03 2:37

sanskypotov

1-Apr-03 2:37

Hi,
I am trying to prevent IE6 from caching files.
I tried all the MSDN tips , but it's of no use.
Can someone tell me how can I prevent IE from caching files
Thanks,
Sansky Big Grin | :-D

John 3:16

For God so loved the world,

that he gave his only begotten Son ( Jesus Christ ) ,

that whosoever believeth in him should not perish, but have everlasting life.

Collection Classes Needed

#realJSOP1-Apr-03 2:35

#realJSOP

1-Apr-03 2:35

I have a bit of a problem. We have a lot of legacy apps that ares spread across three different platforms - desktop Windows, CE 2.12 devices WITHOUT MFC/user interface stuff, and now, PocketPC 2002 with MFC and user interface stuff. They all use STL for strings and collection stuff.

What I want is a set of collection classes that does NOT use MFC or STL, but that provide the same functionality. The optimum solution would be the MFC collection classes extracted from and with no reliance on the rest of the MFC library.

Barring that, I need an STL library which supports Windows, CE 2.12, CE 3.0, and PocketPC 2002.

I already have a replacement for the MFC CString class that doesn't use STL, but I still need a set of collection classes.

Any info, help, scolding, insulting?

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"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Please review the Legal Disclaimer in my bio.

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Re: Collection Classes Needed

jhwurmbach1-Apr-03 2:55

jhwurmbach

1-Apr-03 2:55

John Simmons / outlaw programmer wrote:
I need an STL library which supports Windows, CE 2.12, CE 3.0, and PocketPC 2002

Does STLPort[^] work with these platforms?
It compiles almost everywhere you can start a c++ compiler.

John Simmons / outlaw programmer wrote:
..scolding, insulting..

If you really insist...;P

My opinions may have changed, but not the fact that I am right.

Re: Collection Classes Needed

#realJSOP1-Apr-03 3:06

#realJSOP

1-Apr-03 3:06

I downloaded STLPort (I hate STL).

------- signature starts

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Please review the Legal Disclaimer in my bio.

------- signature ends

Re: Collection Classes Needed

#realJSOP1-Apr-03 4:10

#realJSOP

1-Apr-03 4:10

I hate STL even more now.

STLPort is NOTHING like the SGI implementation...

So much for portability, eh?

------- signature starts

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Please review the Legal Disclaimer in my bio.

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Re: Collection Classes Needed

User 98851-Apr-03 6:53

User 9885

1-Apr-03 6:53

I never used STLPort. What is the difference?

My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers

modified 29-Aug-18 21:01pm.

Re: Collection Classes Needed

#realJSOP1-Apr-03 9:03

#realJSOP

1-Apr-03 9:03

All of the filenames are different, a lot of types are renamed - it's quite impossible for me to use it.

------- signature starts

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Please review the Legal Disclaimer in my bio.

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Re: Collection Classes Needed

Michael Dunn1-Apr-03 9:32

Michael Dunn

1-Apr-03 9:32

ATL has CSimpleArray and CSimpleMap which can substitute for std::vector and std::map. They might not be good substitutes depending on your needs, but at least all the code is templates so you can just copy & paste it in to try them out.

--Mike--
THERE IS NO THERE IS NO BUT THERE IS MAGIC PIXIE DUST BUSINESS GENIE CODE PROJECT

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