C / C++ / MFC Discussion Boards

Christian Graus5-Dec-02 7:30

5-Dec-02 7:30

student() wrote:
for(int i = 0; i < iColSize; i++)
Organism aOrgArray[i] = {new Organism (iNumChroms)};

You seem to be trying to impliment what Nick gave you rather than what I said. With all due respect to Nick, in this case he is mistaken, this code will not work. I don't see where you have actually created this array, for starters, and to assign values like this you'd need to be using the heap.

Organism * aOrgArray = new Organism [iColSize];

for (int i = 0; ....)
aOrgArray[i] = new Organism(iNumChroms];

don't forget delete [] aORgArray; at the end if you do it this way. The other is to provide a constructor that takes no arguments, and then you can do this:

Organism [20] aOrgArray; // A const int value may work, I am not sure.

for (int i = 0;.....
aOrgArray[i].SetNumberChroms(iNumChroms);

Method B is neater IMO.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: An easy one for you pro's...

Brent Lamborn5-Dec-02 9:30

Brent Lamborn

5-Dec-02 9:30

Christian..

Method B works perfectly...and I could even use a const although I had to do this:

Organism aOrgArray [20];

instead of

Organism [20] aOrgArray;

but that's no biggie.

Damn...now I owe you lunch...

Re: An easy one for you pro's...

Christian Graus5-Dec-02 9:39

Christian Graus

5-Dec-02 9:39

student() wrote:
Method B works perfectly...

great !!!

student() wrote:
and I could even use a const

Cool - I wasn't sure, I gave it about a 50/50 Smile | :)

student() wrote:
although I had to do this

Yeah, the syntax did not look right when I typed it, but it was 4:30 am and I was burning a DVD, which means I cannot really fire up a compiler because the PC is so slow.

student() wrote:
Damn...now I owe you lunch...

See you at 12:00..... :P

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Help with an Array of Controls and message maps

VanHlebar4-Dec-02 13:47

VanHlebar

4-Dec-02 13:47

I have some questions regarding Arrays of Controls. I have two arrays declared as follows:

<br />
#define MAX_NUMBER 10<br />
<br />
CStatic m_cStaticArray[MAX_NUMBER];<br />
CString m_strStringArray[MAX_NUMBER];<br />

Now what I would like to do is be able to set the m_strStringArray to a value and then use DDX to update the Static control that relates to it. My problem is that the application may not actuall use all 10 of the CStatic controls. Depending on the user it may only use 1, none, some or all of them. The controls are created depending on certain variables that occur during run time. I have defined all the IDs ahead of time in the Resource.h file for the static controls.

Do I have to perform the movement of the data from the CString variable to the CStatic control manually or can I still use DDX in some way to automate this?

As a side question that I just thought of, if I override the OnHScroll method of a CScrollView derived class do I have to then perform all the various functions required to get the view to scroll or can I do just a small amount of data manipulation and still let the CScrollView handle moving the view?

Thanks for any help,
-Eric

Re: Help with an Array of Controls and message maps

Roger Allen5-Dec-02 1:27

Roger Allen

5-Dec-02 1:27

You should be able to do this with the DDX mechanism. You need to add the entries to map them manually:

//{{AFX_DATA_MAP(CRefineTab)
DDX_Control(pDX, IDC_DROP_GRAPHS, m_DropGraphs);
DDX_Control(pDX, IDC_RESULTS, m_lcResults);
DDX_Control(pDX, IDC_PKA_LIST, m_lcpKaList);
DDX_Control(pDX, IDC_GRAPH, m_YSExtrapolation);
//}}AFX_DATA_MAP
for (int i = 0 ; i < number_of_controls ; i++)
    {
    DDX_Control(pDX, IDC_OF_FIRST_STATIC + i, m_cStaticArray[i]);
    }

Just don't put your code inside the AFX_DATA_MAP tags otherwise class wizard will complain.

Roger Allen
Sonork 100.10016

In case you're worried about what's going to become of the younger generation, it's going to grow up and start worrying about the younger generation. - Roger Allen, but not me!

Re: Help with an Array of Controls and message maps

VanHlebar5-Dec-02 1:48

VanHlebar

5-Dec-02 1:48

Roger Allen wrote:

 //{{AFX_DATA_MAP(CRefineTab) DDX_Control(pDX, IDC_DROP_GRAPHS, m_DropGraphs); DDX_Control(pDX, IDC_RESULTS, m_lcResults); DDX_Control(pDX, IDC_PKA_LIST, m_lcpKaList); DDX_Control(pDX, IDC_GRAPH, m_YSExtrapolation); //}}AFX_DATA_MAP for (int i = 0 ; i < number_of_controls ; i++) { DDX_Control(pDX, IDC_OF_FIRST_STATIC + i, m_cStaticArray[i]); } 

Just don't put your code inside the AFX_DATA_MAP tags otherwise class wizard will complain.

Thanks for the help, but I still get an assertion error on the UpdateData() method in my OnInitialUpdate function.

Here is what my DoDataExchange looks like:

<br />
void CMyView::DoDataExchange(CDataExchange *pDX)<br />
{<br />
	for(int i = 0; i < MAX_USERS; i++)<br />
	{<br />
		DDX_Text(pDX, IDC_STATIC_ONE + i, m_strUsers[i]);<br />
	}<br />
}<br />

Any other thoughts?

-Eric

Re: Help with an Array of Controls and message maps

Roger Allen5-Dec-02 3:13

Roger Allen

5-Dec-02 3:13

You should only call DDX_Text on an item is you actually create it. Thinking on it, you may need to move this code into your OnInitDialog() as the DDX stuff gets called for you by the CDialog::OnInitDialog() implementation which will be before you create your controls properly (unless you do it in the WM_CREATE message handler).

Roger Allen
Sonork 100.10016

In case you're worried about what's going to become of the younger generation, it's going to grow up and start worrying about the younger generation. - Roger Allen, but not me!

Re: Help with an Array of Controls and message maps

VanHlebar5-Dec-02 11:07

VanHlebar

5-Dec-02 11:07

Roger,

Thanks for the help. I got it working properly now by adding a member variable to my View class indicating the number of controls created. Then in the DoDataExchange function I just did a simple for loop until I reached that number.

Thanks again for the help!

-Eric

Changing the toolbar

Rand Al'thor4-Dec-02 12:40

Rand Al'thor

4-Dec-02 12:40

Hi,

I'm creating an app with single document but multiple views.
I'm trying to dynamically change the toolbar as different views are activated.
At the moment, I overwrite the ActivateView() function of each view to make a call to the following function:

BOOL CMainFrame::SetupMainFrameToolbar(UINT ToolbarResourceID, BOOL loadToolbar/* = TRUE */)<br />
{	// Load the toolbar as necessary<br />
	if (loadToolbar == TRUE)<br />
	{	if (!m_wndToolBar.LoadToolBar(ToolbarResourceID))<br />
		{	TRACE0("Failed to create toolbar\n");<br />
			return (FALSE);      <br />
		}<br />
	}<br />
	<br />
	int tempID, location;<br />
	CString stringToDisplay, tempString;<br />
	// Loop through all of the buttons of the toolbar<br />
	UINT ButtonCounter = m_wndToolBar.GetCount();<br />
	for (int index = 0; index < ButtonCounter; index++)<br />
	{	// Get the command ID of the button<br />
		tempID = m_wndToolBar.GetItemID (index);<br />
		// Get the string resource associated with that command ID<br />
		tempString.LoadString(tempID);<br />
		// Find the last string in that resource<br />
		location = tempString.GetLength() - tempString.ReverseFind ('\n') - 1;<br />
		// Cut it and set as the button's title<br />
		stringToDisplay = tempString.Right (location);<br />
		m_wndToolBar.SetButtonText (index, _T((LPCTSTR) stringToDisplay));<br />
	}<br />
<br />
	// change the toolbar size to accomodate the text<br />
	m_wndToolBar.SetSizes (TOOLBAR_BUTTON_SIZE, TOOLBAR_BUTTON_IMAGE_SIZE);<br />
<br />
	if (loadToolbar == TRUE)<br />
	{	// Float and redock this toolbar to recalculate sizes<br />
		FloatControlBar(&(m_wndToolBar), CPoint(50,50));<br />
		DockControlBar (&(m_wndToolBar), AFX_IDW_DOCKBAR_TOP);<br />
	}<br />
	// Recalculate the main frame's layout to position the toolbar appropriately.<br />
	RecalcLayout();<br />
	// Invalidate the window containing the toolbar so it gets redrawn<br />
	m_wndToolBar.InvalidateRect (NULL, TRUE);<br />
	// done correctly<br />
	return (TRUE);<br />
}

As you can see, I was forced to float and redock the toolbar, as AutoSize() doesn't work (it clips my new toolbar to the width of the old toolbar) and RecalcLayout() makes my toolbar buggy (text is only displayed after first a mouse has hovered over the toolbar).

Anybody has ever done this before? Like totally replace the main toolbar everytime a new view is activated?

Help ^^

Big Grin | :-D

Re: Changing the toolbar

Rand Al'thor4-Dec-02 15:23

Rand Al'thor

4-Dec-02 15:23

Again, no reply.. and again, I've solved the problem ^^

What I do is I create an array of toolbars in my MainFrame, and turn them on and off and redock them as the need arise.
Okay.. thanks.

Add grid control to a dialog

peter ho4-Dec-02 12:35

peter ho

4-Dec-02 12:35

Can anyone provide me some more details of how to add the MFC grid control (wrote by Christ Maunder) to a dialog? I can't make it work using his instruction in the article.

Many thanks,

peter.

Re: Add grid control to a dialog

Christian Graus4-Dec-02 15:29

Christian Graus

4-Dec-02 15:29

It's probably appropriate that you ask this in the forum for the article, as Chris is the best person to answer you, and he will get a copy via email if you ask there. It would also help to explain what difficulty you're having. What are the errors you are getting ? What is not working ? etc.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: Add grid control to a dialog

Kannan Kalyanaraman4-Dec-02 19:18

Kannan Kalyanaraman

4-Dec-02 19:18

If you dont mind using it as a activex control, there is an article here on CP porting it to COM. Using Activex control in dialog is very simple. Would work similar to flexgrid.

ATL Grid control[^]

Cheers
Kannan

Disabled

Larsson4-Dec-02 12:29

Larsson

4-Dec-02 12:29

Need to disabled mouse and Alt + TAB and Ctrl, Alt, Del
Anyone??

\Larsson

Re: Disabled

tongc4-Dec-02 14:34

tongc

4-Dec-02 14:34

You can prevent the CTRL+ALT+DEL and ALT+TAB key combinations from opening a task list in Windows 95, Windows 98, or Windows Me by calling the SystemParametersInfo function in the Win32 API.

NOTE: This is possible only in Windows 95, Windows 98, or Windows Me.

Re: Disabled

Larsson5-Dec-02 4:03

Larsson

5-Dec-02 4:03

Thank's!

Utility to scan for unused headers?

Andrew Welch4-Dec-02 12:22

Andrew Welch

4-Dec-02 12:22

Does anyone know of a utility that will scan through your Visual C++ project and list out unused header files, multiply-included headers and the like?

We have a big project with some old code that really could use a cleaning like this.

Thanks in advance.
Andrew

CDatabase

MFC is the Best4-Dec-02 12:03

MFC is the Best

4-Dec-02 12:03

hello @all,

i connected my mfc program and an access database with ODBC.

CDatabase db;<br />
db.Open(_T( "MyDatabase" ), FALSE,<br />
               FALSE, _T( "ODBC"));<br />

the ODBC driver of my database is called 'MyDatabase'. but when i use this code, the database is not selected. i must select it myself!
what must i change to select my odbc driver from the program (i have to do nothing, after i start the program)? Unsure | :~

thanks
mfc

creating CPropertyPages

mariuszpopiolek4-Dec-02 11:37

mariuszpopiolek

4-Dec-02 11:37

Hi
I have two CPropertyPages dialogs, handled by CPropertySheet. I'm executing some code in the second page OnInitDialog handler. This code should be executed during creation of CTreeCtrl located on the second page. After executing this code I receive the data that is needed in first page OnInitDialog handler. Of course I can repeat execution of this code in first page OnInitDialog handler but it would be time consuming (or I can store result of this code so as to use it in second page OnInitDialog, but it means storing it in tree and I want to find easier solution). I have an idea how to solve this problem: second page must be displayed on the beginning (not a problem for me) and after that first page should be activated. The problem is that I cannot fully activate first page. I was able only to change active tab, not the active window inside propertysheet dialog. Thanks in advance for any hints.

Mariusz Popiolek

passing an iterator

Member 1043934-Dec-02 11:34

Member 104393

4-Dec-02 11:34

I am working with some legacy code where a vector<string> t is passed into my function. I created an iterator to read through the vector: vector<string>iterator p
I then pass the vector into another function. I want to also pass the iterator so that the new function continues to know where in the vector it is. What is the best way to pass this information? Thanks.

Re: passing an iterator

Christian Graus4-Dec-02 11:48

Christian Graus

4-Dec-02 11:48

You want to know the index ? Why ? I guess you could pass the index as a number, I just don't get why you would do so.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: passing an iterator

Member 1043934-Dec-02 12:10

Member 104393

4-Dec-02 12:10

This program needs to read through the vector and essentially reads off strings sequentially as it is passed through the functions. This is old code but there is too much to rewrite anew. So the first function reads several "lines" (i.e. strings) an then the vector is passed to another function which needs to read off a variable number of "lines" and passes to other functions, etc. Each read takes the next string, thus, I am hopint to pass the iterator to keep track where it is (each function using the iterator to know which index is next to read). I have not used iterators except in very basic uses within one fuction and have not figured out how to pass one. Thanks.

Re: passing an iterator

Christian Graus4-Dec-02 13:34

Christian Graus

4-Dec-02 13:34

I don't see why it would be hard to pass one - where are you stuck ?

Iterators from a vector support random access, so you can both use ++ and -- to step.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: passing an iterator

Member 1043934-Dec-02 13:50

Member 104393

4-Dec-02 13:50

Here is what I have:

static int read_layout(std::vector<std::string> &, vector<std::string>iterator, char *)

static int read_layout(std::vector<std::string> & trs, vector<std::string>iterator pr, char *szName)
{

}

void StartReading(std::vector<std::string> & trs)
{
vector<std::string>::iterator pr;
pr = trs.begin();
string s = *pr;
strcpy( szHeader, s.c_str() );
pr++; //there are several of these types of access prior to function call

iStatus = read_layout_truss(trs, pr, szName)
}

I am not able to get this to compile as is. Hopefully I did not post this previously as my keyboard seems to be freezing on me. Thanks for your input.

Re: passing an iterator

Christian Graus4-Dec-02 15:22

Christian Graus

4-Dec-02 15:22

I see - damn typedefs. They should not do any harm, beyond obsfucating your code.

I suspect you need to pass them by reference, as the vector is also being passed.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

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