C / C++ / MFC Discussion Boards

Re: CTree, change selection on right click

brianwelsch5-Sep-02 16:04

brianwelsch

5-Sep-02 16:04

BW
{insert witty/thought-provoking saying here}

Visual C++ book

marekm5-Sep-02 10:45

marekm

5-Sep-02 10:45

I'm interested in windows programming and I was looking for some books but I don't know wich one to buy. Do you have any suggestions?

marekm

Re: Visual C++ book

brianwelsch5-Sep-02 10:53

brianwelsch

5-Sep-02 10:53

If your interested in MFC, then I'd recommend "Windows Programming with MFC" by Jeff Prosise. It's helped me out, along with the help I've gotten out here.

Good Luck!

BW
{insert witty/thought-provoking saying here}

Re: Visual C++ book

adamUK5-Sep-02 12:31

adamUK

5-Sep-02 12:31

Second that... Jeff's book is great. Smile | :)

Also Sams 'teach yourself c++ in 21 days is quite good'. There's no Windows stuff in it which is great because it sidetracks you from learning the theory.

"I spent a lot of my money on booze, birds and fast cars. The rest I just squandered"
George Best.

Re: Visual C++ book

valikac5-Sep-02 15:32

valikac

5-Sep-02 15:32

Do you want to learn MFC or Win32 API?

For MFC, I highly recommend that you study from these two books in the exact order listed.

Introduction to MFC Programming with Visual C++ by Richard M. Jones
Programming Windows With MFC by Jeff Prosise

For Win32 API, Programming Windows, The Definitive Guide to the Win32 API by Charles Petzold is unparalleled.

Kuphryn

Re: Visual C++ book

Paul Lyons5-Sep-02 19:01

Paul Lyons

5-Sep-02 19:01

For learning straight Win32 API programming - Programming Windows Fifth Edition, Charles Petzold. MS Press, ISBN 1-57231-995-X

For learning the Visual C++ environment and some MFC fundementals - Programming Visual C++ Fifth Edition, Kruglinski, Shepherd, Wingo. MS Press ISBN 1-57231-857-0

and finally...

Programming Windows with MFC Second Edition, Jeff Prosise. MS Press, ISBN 1-57231-695-0

I own all three of these books and find them to be invaluable resources. Blush | :O

Paul Lyons, CCPL
Certified Code Project Lurker

What a long, strange trip it's been - Robert Hunter

Dialog Based & Menu Update :: MFC

valikac5-Sep-02 10:45

valikac

5-Sep-02 10:45

Hi.

I have two questions about menu in a dialog based application.

First, how do you add an on command for menu items in a dialog based app? In other words, without ON_COMMAND how do you add an event handle for menu item?

Second, I saw two solutions for updating, i.e. enable or disable, menu items in a dialog based app.

1) CMenu *pMenu = GetMenu(0)

This solutions is exactly like updating contextmenu. Am I correct? Do you have to call function to redraw the menu?

2) Add an event handle for WM_KICKIDLE

http://www.codeguru.com/dialog/OnUpdate.shtml

I would like to know the preferred solution for updating menu items in a dialog based app.

Thanks,
Kuphryn

Re: Dialog Based & Menu Update :: MFC

Tomasz Sowinski5-Sep-02 11:14

Tomasz Sowinski

5-Sep-02 11:14

I'd go for (2) - it will work with toolbar as well.

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

** Putt knot yore thrust inn spel chequers. **

Re: Dialog Based & Menu Update :: MFC

valikac5-Sep-02 12:29

valikac

5-Sep-02 12:29

Okay. Thanks.

-----
LRESULT CTestDlg::OnKickIdle(WPARAM, LPARAM)
{
CMenu* pMainMenu = GetMenu();
CCmdUI cmdUI;
for (UINT n = 0; n < pMainMenu->GetMenuItemCount(); ++n)
{
CMenu* pSubMenu = pMainMenu->GetSubMenu(n);
cmdUI.m_nIndexMax = pSubMenu->GetMenuItemCount();
for (UINT i = 0; i < cmdUI.m_nIndexMax;++i)
{
cmdUI.m_nIndex = i;
cmdUI.m_nID = pSubMenu->GetMenuItemID(i);
cmdUI.m_pMenu = pSubMenu;
cmdUI.DoUpdate(this, FALSE);
}
}
return TRUE;
}
-----

The code above is from solution #2 using WM_KICKIDLE. I am not sure what to set to enable and/or disable an item. Does this line do it?

-----
cmdUI.DoUpdate(this, FALSE);
-----

Kuphryn

Re: Dialog Based & Menu Update :: MFC

jhwurmbach5-Sep-02 20:31

jhwurmbach

5-Sep-02 20:31

And you can use UpdateDialogControls() for updating toolbars and anything that has a ON_COMMAND_UI handler in your dialog.

Re: Dialog Based & Menu Update :: MFC

JT Anderson5-Sep-02 12:39

JT Anderson

5-Sep-02 12:39

You do use ON_COMMAND to handle menu commands in a dialog based app. I'm not sure what you are getting at.

As for disabling menu items, add an OnInitMenuPopup handler similar to this:

void CMyDialog::OnInitMenuPopup(CMenu* pPopupMenu,
UINT nIndex,
BOOL bSysMenu)
{
CDialog::OnInitMenuPopup(pPopupMenu, nIndex, bSysMenu);

CCmdUI cmdui;

cmdui.m_pMenu = pPopupMenu;
cmdui.m_nIndexMax = pPopupMenu->GetMenuItemCount();

for (cmdui.m_nIndex = 0; cmdui.m_nIndex < cmdui.m_nIndexMax; cmdui.m_nIndex++) {
cmdui.m_nID = pPopupMenu->GetMenuItemID(cmdui.m_nIndex);
if (cmdui.m_nID == 0) continue;

cmdui.DoUpdate(this, FALSE);
}
}

Then you can use the normal ON_UPDATE_COMMAND_UI mechanism to enable/disable your menu items.

Re: Dialog Based & Menu Update :: MFC

valikac5-Sep-02 13:55

valikac

5-Sep-02 13:55

Nice!!! Thanks.

One last question. JohnCz of CodeGuru criticized the use of a dialog based app. He mentioned about using SDI without doc and using a CFormView. What are you inputs on using CFormView? What are the advantagesand disadvantages o using CFormView over a dialog based app and vice versa?

Thanks
Kuphryn

how to check that a certain table exists in the db?

ns5-Sep-02 10:18

5-Sep-02 10:18

Using ADO, I want to check and see in a database (its only got one table) what the name of the table is. Any clues or links to this?
Thanks,
ns

Re: how to check that a certain table exists in the db?

Carlos Antollini5-Sep-02 10:28

Carlos Antollini

5-Sep-02 10:28

Use ADOX.... You can see the catalog...
Or with ado, you can make a select to the sysobjects catalog.
For example

select name, id, xtype from sysobjects where xtype='u'

regards

Carlos Antollini.
Sonork ID 100.10529 cantollini

Re: how to check that a certain table exists in the db?

ns5-Sep-02 10:45

5-Sep-02 10:45

I just ran into your cadox class on CP....I'm going to try it....

Re: how to check that a certain table exists in the db?

ns5-Sep-02 10:50

5-Sep-02 10:50

In you cadox class,

void GetTableName(long nTableIndex, CString strTableName);

if I only have one table what is the index?

Thanks,
ns

SendMessage returns LB_ERR when sending LB_SETITEMDATA message.

5-Sep-02 10:03

What i would like to do is, that I'm enumerating a list with all the system's different audio compressors. Each time i add a compressor name to the list, i want to set that item's user data to a driver identifier to the compressor. The driver identifier is 4 bytes so it should fit, but when i send the message, it returns LB_ERR. Here's the code:

BOOL WINAPI listCallback(HACMDRIVERID hadid, DWORD dwInstance, DWORD fdwSupport)
{
	ACMDRIVERDETAILS details;
	int i;
	
	details.cbStruct = sizeof(details);

	acmDriverDetails(hadid, &details, NULL);

	SendMessage(GetDlgItem(ghWnd, IDC_CODECS), LB_INSERTSTRING, -1, (LPARAM)details.szLongName);
	i = SendMessage(GetDlgItem(ghWnd, IDC_CODECS), LB_GETCOUNT, 0, 0) - 1;
	SendMessage(GetDlgItem(ghWnd, IDC_CODECS), LB_SETITEMDATA, i, (LPARAM)hadid);

	return TRUE;
}

I've also tested if the GetDlgItem(ghWnd, IDC_CODECS) returns a valid handle and it does. And I've also tried replacing the (LPARAM)hadid with, for instance, 2, but it still returns LB_ERR. What am i doing wrong?

Thanks in advance.

-Rune Svendsen

Re: SendMessage returns LB_ERR when sending LB_SETITEMDATA message.

Joaquín M López Muñoz5-Sep-02 12:31

Joaquín M López Muñoz

5-Sep-02 12:31

What happens if you omit the LB_SETITEMDATA part? Do the list items appear (altough without being associated with their respective HACMDRIVERID)? If not, then the problem is somewhere else.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

How can I use LPBITMAPINFOHEADER to store and redisplay view contents?

Ted Christiansen5-Sep-02 8:50

Ted Christiansen

5-Sep-02 8:50

Hello,

This is code from an OnEditCopy handler of the Visualization Toolkit. I am trying to add animations to my application by generating the frames (as bitmaps) and then redisplaying them. I have tried using the CPicture class here and the vtk offscreen rendering (using a bitmap writer object), but it is unreliable, crashing the program.

Another solution would be to adapt this code to store the contents. I have never used LPBITMAPINFOHEADER. Can anyone point me in the right direction on how to copy this bitmap data onto the view, thus displaying it? Thanks.

Ted

LPBITMAPINFOHEADER lpbi; // pointer to BITMAPINFOHEADER
DWORD dwLen; // size of memory block
HANDLE hDIB = NULL; // handle to DIB, temp handle

vtkWindow *vtkWin = pView->GetVTKWindow();
int *size = vtkWin->GetSize();
int dataWidth = ((size[0]*3+3)/4)*4;

dwLen = sizeof(BITMAPINFOHEADER) + dataWidth*size[1];

// allocate memory for the bitmap
hDIB = ::GlobalAlloc(GHND, dwLen);

// setup bitmap info header
lpbi = (LPBITMAPINFOHEADER) ::GlobalLock(hDIB);
lpbi->biSize = sizeof(BITMAPINFOHEADER);
lpbi->biWidth = size[0];
lpbi->biHeight = size[1];
lpbi->biPlanes = 1;
lpbi->biBitCount = 24;
lpbi->biCompression = BI_RGB;
lpbi->biClrUsed = 0;
lpbi->biClrImportant = 0;
lpbi->biSizeImage = dataWidth*size[1];

// start memory rendering
pView->SetupMemoryRendering(size[0],size[1], pView->GetDC()->GetSafeHdc());
vtkWin->Render();

// copy the bitmap data into the bitmap
memcpy((LPSTR)lpbi + lpbi->biSize, pView->GetMemoryData(), dataWidth*size[1]);

::GlobalUnlock(hDIB);

// turn screen rendering back on
pView->ResumeScreenRendering();

// now how can we draw this bitmap on the view (CDC)?

Re: How can I use LPBITMAPINFOHEADER to store and redisplay view contents?

C^hris L^osinger5-Sep-02 9:21

C^hris L^osinger

5-Sep-02 9:21

Ted Christiansen wrote:
now how can we draw this bitmap on the view (CDC)?

use CDC::StretchDIBits

-c

"I am angry that so many of the sons of the powerful and well-placed... managed to wangle slots in Reserve and National Guard units...Of the many tragedies of Vietnam, this raw class discrimination strikes me as the most damaging to the ideal that all Americans are created equal and owe equal allegiance to their country."
--Colin Powell, not talking about his boss

Re: How can I use LPBITMAPINFOHEADER to store and redisplay view contents?

Ted Christiansen7-Sep-02 2:49

Ted Christiansen

7-Sep-02 2:49

Chris,

I have tried this and I cant seem to figure out why the memory CDC's are 1x1 pixels.
I added these calls to set the size after I noticed this fact and they are
still 1x1:

CDC *frame = GetDocument()->AddFrame();
ASSERT(frame);
// pic->Load(tmpname);
frame->CreateCompatibleDC(GetDC());
CRect rect;
GetClientRect(&rect);
frame->SetViewportExt(rect.Width(), rect.Height());
frame->SetWindowExt(rect.Width(), rect.Height());
frame->BitBlt(0, 0, rect.Width(), rect.Height(), GetDC(), 0, 0, SRCCOPY);

CSize s = frame->GetWindowExt();
TRACE("CVtksampleView::OnSaveimage window: %d %d viewport: ", s.cx, s.cy);
s = frame->GetViewportExt();
TRACE("%d %d\n", s.cx, s.cy);

What am I missing?

Ted

Re: How can I use LPBITMAPINFOHEADER to store and redisplay view contents?

C^hris L^osinger7-Sep-02 5:35

C^hris L^osinger

7-Sep-02 5:35

Ted Christiansen wrote:
I cant seem to figure out why the memory CDC's are 1x1 pixels

you need to create a compatible bitmap, then select it into your memory DC, before you draw into it. by default, a DC comes with a 1x1 mono biitmap. (also, be sure to use the real dc, not the memory DC, when you make the compatible bitmap, otherwise, you'll get another 1x1).

-c

Argue for your limitations, and sure enough, they're yours.

PostQuitMessage(0) wont quit the app

ns5-Sep-02 8:25

5-Sep-02 8:25

I have a CFileDlgST browseforFolder that is spawned at the start of the app. If I do cancel, the app quits:

if(nRetValue == IDCANCEL)
{
    AfxMessageBox ("No Image folder selected, terminating application");
    PostQuitMessage(0);
}

BUT

if I already have the app up and running, and then this same CFileDialogST (from CP) pops up to select a browse folder, (it does go into the IDCANCEl condition), but the app doesnt terminate! The dlg vanishes but thats all!
??? Confused | :confused:

I just read that it terminates a thread. I dont have a nmultithreaded app or anything, but would the dialog be considered a thread?

Thanks,
ns

Re: PostQuitMessage(0) wont quit the app

ns5-Sep-02 8:31

5-Sep-02 8:31

I tried exit(0) instead and the app crashed! So one function crashes it and one is ignored by the app!!!
The crash only happens if the app is already running (and I didnt cancel out the first time), but then in the next time that same dialog comes upp, and I cancel it crashes! If I cancel out the fisrt time all is well.

Re: PostQuitMessage(0) wont quit the app

dazinith5-Sep-02 9:22

dazinith

5-Sep-02 9:22

where are you strying to exit from (what class)? I dont call any explicit commands to exit in my program.. however in my InitInstance() of my CMyApp i return false if anything fails to load, etc..

if you are forcing your users to browse when the program opens then do this in your app's InitInstance() function.. then if they hit cancel you can just return FALSE and the app will not continue to load..

hope that helps.

-dz

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