IEnumIDList and Next usage - C / C++ / MFC Discussion Boards

Re: CCtrlView does not show my items

Ben Burnett31-Jul-01 14:24

Ben Burnett

31-Jul-01 14:24

Works fine for me, exept I just had to add in two lines (in bold bellow)

// --> CListView::OnInitialUpdate();<br />
<br />
// this code only works for a report-mode list view<br />
ASSERT(GetStyle() & LVS_REPORT);<br />
<br />
CListCtrl& theCtrl = GetListCtrl();<br />
// Insert a column. This override is the most convenient.<br />
theCtrl.InsertColumn(0, _T("Player Name"), LVCFMT_LEFT);<br />
LVCOLUMN col;<br />
col.mask = LVCF_FMT | LVCF_TEXT;<br />
col.pszText = _T("Jersey Number");<br />
col.fmt = LVCFMT_LEFT;<br />
theCtrl.InsertColumn(1, &col);<br />
// Set reasonable widths for our columns<br />
theCtrl.SetColumnWidth(0, LVSCW_AUTOSIZE_USEHEADER);<br />
theCtrl.SetColumnWidth(1, LVSCW_AUTOSIZE_USEHEADER);<br />
<br />
for (int i=0;i < 10;i++)<br />
{<br />
strText.Format(TEXT("item %d"), i);<br />
<br />
// Insert the item, select every other item.<br />
theCtrl.InsertItem(<br />
LVIF_TEXT|LVIF_STATE, i, strText, <br />
(i%2)==0 ? LVIS_SELECTED : 0, LVIS_SELECTED,<br />
0, 0);<br />
<br />
CString strText;<br />
int nColumnCount = theCtrl.GetHeaderCtrl()->GetItemCount();<br />
<br />
// Initialize the text of the subitems.<br />
for (int j=1;j < nColumnCount;j++)<br />
{<br />
strText.Format(TEXT("sub-item %d %d"), i, j);<br />
theCtrl.SetItemText(i, j, strText);<br />
}<br />
}

Ben Burnett

---------
On the topic of code with no error handling -- It's not poor coding, it's "optimistic" Wink | ;)

Re: CCtrlView does not show my items

Wim Jans1-Aug-01 2:12

Wim Jans

1-Aug-01 2:12

The code in Bold was actualy in my view, I only forgot to copy/paste it in Blush | :O

The form I was testing with uses the BCG library but I've just created an normal MDI mfc program based on CListView, copied the code and it worked fine indeed.

After that, I installed the new version of the BCG library and copied the code over to the view, and guess what: the list appeared. Big Grin | :-D

So, I think I will upgrade my library at home too and I can continue to try to get a grip of Visual C++ - which is a lot easier thanks to CodeProject.

Thanks for your time!

Wim

Extracting features from a BMP

Russel Hawkins31-Jul-01 10:57

Russel Hawkins

31-Jul-01 10:57

Has anyone got experiance with extracting features from a bitmap image. Cool | :cool:

Re: Extracting features from a BMP

C^hris L^osinger31-Jul-01 11:18

C^hris L^osinger

31-Jul-01 11:18

what do you mean by "features" ?

-c

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

Re: Extracting features from a BMP

Russel Hawkins31-Jul-01 21:36

Russel Hawkins

31-Jul-01 21:36

Yes I guess my question was rather broad.

What I have is two finger print bitmaps that I would like to compare the connection points to. This is not generalized graphics but rather a science of forensics.

There are books available on the subject, there seems to be no code guidelines available on who to do this in C++.

Can you help.
Cool | :cool:

Reading int/long lengths from binary file

31-Jul-01 10:08

Sorry to ask again but how do I read INTEGER or LONG length values in from a binary file?
At the moment I can only get single bytes.
Do I use GET or READ?
How to I modify the following code to read an integer length value from address 4110 in the DAT file?

==============================================

ofstream path("c:\\windows\\desktop\\debug.dat");
........................

int pos = 4110;
path.seekg(pos);
int bytevalue = path.get();

================================================

Sorry to be dumb, tried to work it out myself but failed (& no online helpfile)

cheers
Richard Edwards

Re: Reading int/long lengths from binary file

Paolo Messina31-Jul-01 10:45

Paolo Messina

31-Jul-01 10:45

Hi,

I'm not sure, since I don't often use C++ streams to do I/O, but it seems you should use: path.read((char*)&myInt, 4); if you're using ifstream.

Paolo

------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)

IEnumIDList and Next usage

31-Jul-01 9:34

Hi all,

When I use the code below to enumerate the shell namespace, a second thread seems to get started by the IEnumIDList::Next(...) function. This function executes normally and gives me the desired results, but for some reason when my program exits, the second thread (not the application thread) always terminates with a return code of -1 and not 0 (like the main thread). This second thread delays the termination of my program quite considerably and is rather annoying. It would seem to suggest that I'm not using IEnumIDList properly, because if I take out the while(...) loop with the ::Next(...) call in it, the second thread never appears. So, my question is, what is wrong with the following call? What am I not doing to stop this second thread that appears out of nowhere?? Confused | :confused:

------ CODE -------
void CFileTreeView::OnInitialUpdate()
{
HTREEITEM rNode;
ITEMIDLIST *pidl;
IShellFolder *pShellRoot;
DWORD iGot;

// Called inherited constructor.
CTreeView::OnInitialUpdate();

// Clear the view.
GetTreeCtrl().DeleteAllItems();

// Get a pointer to the IShellFolder namespace.
pShellRoot = GetDocument()->GetShellRoot();

// Iterate through the shell namespace for devices.
if(SHGetSpecialFolderLocation(m_hWnd, CSIDL_DESKTOP, &pidl) == NO_ERROR)
{
rNode = AddNode( pShellRoot, pidl, pidl );

IEnumIDList *pidlList;
if(pShellRoot->EnumObjects(m_hWnd, SHCONTF_FOLDERS |
SHCONTF_INCLUDEHIDDEN, &pidlList) == NO_ERROR)
{
while( pidlList->Next(1, &pidl, &iGot) == NO_ERROR )
AddNode( pShellRoot, pidl, pidl, rNode );

pidlList->Release();
}

GetTreeCtrl().Expand( rNode, TVE_EXPAND );
}
else AfxMessageBox("SHGetSpecialFolderLocation() failed! No namespace!");

GetDocument()->ReleaseShellRoot();
}

The AddNode(...) function simply fills out a TV_ITEM structure and creates a node, I am aware that the pidl's from the IEnumIDList(...) are not freed, they are dealt with in an OnDelete() handler for the individual tree nodes.
GetShellRoot() and ReleaseShellRoot() simply wrap the AddRef() and Release() functions for IShellFolder and display TRACE messages if I forget to release an instance.

Any help would be appreciated.
Jonathan Thorpe

Resizing List Control Columns

Scott Evans31-Jul-01 9:13

Scott Evans

31-Jul-01 9:13

Hello All!

I am perplexed and am hoping that someone out there could help me figure this out. I have an application that uses a CListCtrl. When the application window is resized, I would like to dynamically resize each of the columns to fit the view. I have had a little success, however, as the application is resizing, the horizontal scroll bar flickers on and off as the columns are being resized Cry | :((

.

This happens only when I have "show window contents while dragging" enabled in Windows, when this is turned off you don't notice the problem. What I am trying to do is similar to Outlook where the columns are resized as the window is resized.

Please help, as I have exhausted all resources trying to find an answer to this, but have had no success.

Warm Regards,
Scott Evans

Re: Resizing List Control Columns

Tomasz Sowinski31-Jul-01 9:21

Tomasz Sowinski

31-Jul-01 9:21

Need more detailed info - post your OnSize handler or routine you're using to change the widths.

Tomasz Sowinski -- http://www.shooltz.com

Re: Resizing List Control Columns

Paolo Messina31-Jul-01 10:33

Paolo Messina

31-Jul-01 10:33

Hi,

It could be that you're resizing when the scrollbar has already been shown.
Try to do it in OnSizing (WM_SIZING) or try to SetRedraw(FALSE) before, then SetRedraw(TRUE) after the resizing process.

Hope this helps,
Paolo.

------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)

Setting font used by TextOut

31-Jul-01 7:18

I'm writing a DirectDraw program that has a menu at the start from a template. The author of the template uses

TextOut(hDC, MENU_XBEG, MENU_YBEG, szItem, lstrlen(szItem));

to print out a menu item.

I would like to change the size and typeface of the font. How would I accomplish this? SetFont()?

Thanks for the assistance,
Ryan

Re: Setting font used by TextOut

Tomasz Sowinski31-Jul-01 7:39

Tomasz Sowinski

31-Jul-01 7:39

First you need to create font. Use CreateFont or CreateFontIndirect for that. Next, you need to make your font 'selected' with SelectObject. You should call DeleteObject when you no longer need the font. I think tyou should read "Font Creation and Selection" in "Platform SDK : Windows GDI" docs before coding. These docs should be installed with your VC++ help.

Tomasz Sowinski -- http://www.shooltz.com

DISPLAY AMOUNTS WITH COMMAS

31-Jul-01 7:02

does anybody knows how to display an amount with commas? Confused | :confused:

wibi

Re: DISPLAY AMOUNTS WITH COMMAS

Ben Burnett31-Jul-01 14:36

Ben Burnett

31-Jul-01 14:36

Check GetNumberFormat() or GetCurrencyFormat() in your doc's.

Ben Burnett

---------
On the topic of code with no error handling -- It's not poor coding, it's "optimistic" Wink | ;)

Re: DISPLAY AMOUNTS WITH COMMAS

Bret Faller3-Aug-01 10:02

Bret Faller

3-Aug-01 10:02

Also look at COleCurrency. Works like COleDateTime and has a format function that will return a currency in the locale form (such as commas for japan or . if in the US)

Bret Faller
Odyssey Computing, Inc.

change text color in a combo box

31-Jul-01 6:34

I have created a onctlcolor function to change to text color of my controls.
but i can not change the text color in the combo box. Is there another funtion to do this?

Thank you

Problem with Cristi Posea's CSizingControlBar

Jamie Nordmeyer31-Jul-01 6:20

Jamie Nordmeyer

31-Jul-01 6:20

I have (so far) a default MDI app with a CSizingControlBarG derived bar docked on the left side of my frame. Since it's the default MDI implementation (the one created by AppWizard), I have a menu, one toolbar, and a status bar. When I begin a resize operation on the control bar, the splitter shows up as it should, but is drawn on top of the toolbar, and doesn't go all the way to the status bar. So, the splitter is the correct length, but it's shifted up by the height of the toolbar (seemingly). How do I fix this, so it draws from the bottom of the toolbar (instead of over it) down to the status bar?

Thanks in advance.

Jamie Nordmeyer
Portland, Oregon, USA

Jamie Nordmeyer
Portland, Oregon, USA

CFtpFileFind

31-Jul-01 6:13

hello

hsa anyone worked with this class? it causes me a lot of troubles, sometimes it doesnt find existing files and sometimes the CFtpFileFind::IsDirecory() is not working...

pliz help? are there any other alternatives to this class?

thanks
RG

set text color of a combo box

31-Jul-01 5:50

I have created an OnCtlColor function to set the colors of my text boxes, labels,listbox and combo boxes. It works fine with all but the combo box.
Can the text color of a combo box be modified? If so how can it be done?
Thank you

Sending Messages

31-Jul-01 5:05

I am trying to send messages to a process I created using CreateProcess().
For the send function I need a HWND handle of the process' main Window. How can I optain this handle from what I know after calling CreateProcess()?

LP

Re: Sending Messages

Tomasz Sowinski31-Jul-01 9:16

Tomasz Sowinski

31-Jul-01 9:16

There's no general method for that - CreateProcess can spawn the windowless process, after all. You should use WaitForInputIdle with handle of the child process to give it a time to create its main window, and FindWindow to get the HWND of this window. You'll need the window class name, use Spy++ if you don't know what's the class name.

Tomasz Sowinski -- http://www.shooltz.com

Re: Sending Messages

31-Jul-01 12:03

Thank you

LP

ActiveX CView and OpneGL

31-Jul-01 4:52

Hi,

I have an MFC MDI app that I have used to develop a CView derived class that does some pretty involved OpenGL rendering. Nothing heavy computationally, just very focussed on a customers needs.

I now need to apply what I have done in such a way that it can be wrapped by an ActiveX control.

Aside from buying a good book, that I naturally intend to do, can anyone tell me if it possible to reuse the CView derived class Blush | :O

Any pointers would be greatly appreciated to get me going until the book arrives...

Matthew

Re: ActiveX CView and OpneGL

Not Active31-Jul-01 15:35

Not Active

31-Jul-01 15:35

Yes you should be able to reuse this by wraping it in a MFC ActiveX. The book would be the best to help you, I like to avoid using MFC and ActiveX in the same sentence. Damn! Did it twice.;)

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.