C / C++ / MFC Discussion Boards

11-Aug-01 21:34

I am writing a function that need to return a variant data type ,some times string sometimes integral and so on.so I declare a variale with a VARIANT data type but I chocked when I know that I must determine wich type of variant before I use it(VT_U8,VT_I and ...).
I thought it is like a Variant type in Visual Basic.
So can any body tell me how can do that.

Mad | :mad:

M.S.

Re: VARIANT data type.

13-Aug-01 10:27

have you looked in msdn documentation for _variant_t. I am certain you will find your answer there.

Confused | :confused:

Re: VARIANT data type.

Carlos Antollini13-Aug-01 10:44

Carlos Antollini

13-Aug-01 10:44

Is Simple.
If you have a value like Integer.
you need to use some like this

_variant_t var;

var.vt = VT_I2;
var.iVal = iVal; //where iVal is your variable.

VT_I4 is for Long, etc....

For a variable type string you need to make this.
vtFld.vt = VT_BSTR;
vtFld.bstrVal = _bstr_t(strValue);

And for read variants is the same...
Good Luck!!!!!
Big Grin | :-D

Carlos Antollini.

CEdit help

aarong11-Aug-01 20:53

aarong

11-Aug-01 20:53

Is there a way i can manipulate a CString in order for me to insert a linebreak manually for an edit box. I am changing data inside the editbox via CString and need to be able to line break, and the regular \n doesn't work, it just shows an unusual character.

Thanks

Re: CEdit help

Stephen McGeown12-Aug-01 2:37

Stephen McGeown

12-Aug-01 2:37

Try \r\n instead of \n on its own.

Cheers.

ATL hell - import object to MFC project part III

Christian Graus11-Aug-01 18:30

Christian Graus

11-Aug-01 18:30

I thought I'd just done something wierd last time, because I created a new object and was able to use it right away using the code I posted before. But now I've created a new ATL project, on a different machine and the same thing is happening.

I create an ATL object, I create a method, and I compile it. I use MinDependency, making sure I specify -GX for try/catch unwinding and remove _ATL_MIN_CRT if necessary.

Then I #import the .tlb file in my stdafx of a brand new, stock standard dialog project. I call CoInitialise(NULL) before anything else in InitInstance, and in ExitInstance I call CoUninitialise().

Then in my OnInitDialog I try something like IMyClassPtr ptr(_uuidof(MyClass)); and if I do it in a try catch block I get a Message Box up with the _com_error ErrorMessage(), which is Class Not Registered ( or something similar, maybe Object Not Registered ? ).

I have tried RegSrv32 to register it myself, verified it has the proper Registry entries ( to the best of my knowledge, the name is stored under the IID with some other info ), and this despite VC++ putting up a 'registering server' type message when I compile. I've tried other methods of creating the file and my pointer is always NULL. The book I am working from seems to assume what I am doing will *always* work, because it gives no further info. Is there something glaringly obvious I am doing wrong ?

Thanks again...

Christian

Secrets of a happy marriage #27:

Never go to bed if you are mad at each other. It's more fun to stay up and fight.

Re: ATL hell - import object to MFC project part III

11-Aug-01 21:07

If your interface not derives from IDispatch then
it should have proxy-stub also being registered.
You should build and register YourClassps.dll .
There is YourClassps.mk makefile to help.

CWnd::MoveWindow(...) in CScrollView doesn't work

Craig Miller11-Aug-01 18:16

Craig Miller

11-Aug-01 18:16

Hi,

I have a CWnd that I create in my CScrollView::OnCreate(...) like so:

int CMyScrollView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CScrollView::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// TODO: Add your specialized creation code here
	m_myCwnd.Create( NULL, "", WS_CHILD|WS_VISIBLE|WS_BORDER, CRect(50,50,100,100), this, 23423 );

	m_myCwnd.Create( this );
	
        return 0;
}

Then in my CScrollView::OnSize(...) I want to make the CWnd the same size as the CScrollView so I call MoveWindow(...) like so:

void CMyScrollView::OnSize(UINT nType, int cx, int cy) 
{
	CRect myRect;
	GetClientRect(&myRect);

	ClientToScreen(myRect);
	m_myCwnd.MoveWindow(myRect.left, myRect.top, myRect.Width(), myRect.Height(), TRUE);

	CScrollView::OnSize(nType, cx, cy);
}

The problem is that after the call to MoveWindow(...) nothing happens, my CWnd is still the same size and position as when it was created.

Does anyone have any idea wht I'm doing incorrectly?

Any help would be greatly appreciated,

Craig

Self Extracting Exe

sankar11-Aug-01 15:42

sankar

11-Aug-01 15:42

Dear All
When I install the visual C++, I find an option under tools for creating "Self Extracting exe" - how can I make use of this??

regards
Sankar

MFC SDI application: opening documents

11-Aug-01 9:37

Hey
How do I access the files that I select when I goto "Open" in an MFC built SDI app?
What is the string of the path, or how can I then open that file for reading??

AND

How can I stop the default "new file" on start up, and get it to wait for a document to be specified to open?

Please help a desparate newbie! Smile | :)

Tim T

Re: MFC SDI application: opening documents

12-Aug-01 6:40

Come on guys, this is really important to me!
Please!

Re: MFC SDI application: opening documents

Stephen McGeown12-Aug-01 11:16

Stephen McGeown

12-Aug-01 11:16

OK!

In your new app, go to the class wizard, select the object ID called "ID_FILE_OPEN". Then click on the COMMAND text in the box marked "Messages". Next, click "Add function" and it'll prompt you to name the function - probably "OnFileOpen".

It will generate a member function called OnFileOpen() somewhere in your code, probably as part of your mainframe class. So, you find your OnFileOpen() function, which will be empty except for some comments like "Add your command handler code here".

Add some code like this to your OnFileOpen() function:

{
CString strFilter;
CString path;
FILE *myfile;

CFileDialog MyFileDialog(TRUE,
"*.txt",
NULL,
NULL,
"Text file (*.txt)|*.txt" );

/* Display the File Dialog box */
int result = MyFileDialog.DoModal();

/* Return the path (including filename) */
path = MyFileDialog.GetPathName();

/* Open it up */
myfile = fopen(path, "r");
/* etc...*/
}

Haven't tested this out but it might be worth a bash. As for your second question, no idea but I've noticed that the behaviour differs between Win9x and Win NT.

Hope it helps. Cheers.

change tabstop

11-Aug-01 9:09

I want to change the order in which my controls react on the tabstop.
I.e. I want to change the tabstop-order, how can I do this?

Re: change tabstop

11-Aug-01 9:39

Select the dialog that contains your controls. Then go to the 'Layout' menu and select 'Tab Order'.

You'll see a whole bunch of numbers which denote the order that the tabs are set to. Click on these numbers to adjust the order. Your first click will be the first tab, second click will be the second tab, and so on...

Hope this helps.

Re: change tabstop

11-Aug-01 12:16

Thanks a lot!!

Works fine Smile | :)

Custom Draw in CListView

11-Aug-01 7:52

Hi
I want to paint some items in my CListView-derivered class in different colors.
I know how this works with CListCtrl, you have to work with these functions:

afx_msg void DoNotify(NMHDR* pNMHDR, LRESULT* pResult);

and you have to set a ON_NOTIFY(NM_CUSTOMDRAW, IDC_ONLINE, DoNotify) into the Message-map

But ON_NOTIFY requiers a control-id from a CListCtrl.
So how can I do it with a CListView not CListCtrl?

thanks in advance

Re: Custom Draw in CListView

Michael Dunn11-Aug-01 7:55

Michael Dunn

11-Aug-01 7:55

Use the ON_NOTIFY_REFLECT macro in your view class.

--Mike--
http://home.inreach.com/mdunn/
"Make sure that if you are using a blow torch that you don't set anything on fire."
-- Chris Maunder

Re: Custom Draw in CListView

11-Aug-01 8:02

Yeah thanks, I just found out by myself.
Could you please tell me what's wrong with this code:
The items are not painted in red font-color Confused | :confused:

NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<nmlvcustomdraw*>( pNMHDR );

if ( CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage )
{
*pResult = CDRF_NOTIFYITEMDRAW;
}
else if ( CDDS_ITEMPREPAINT || CDDS_SUBITEM == pLVCD->nmcd.dwDrawStage )
{
*pResult = CDRF_NOTIFYSUBITEMDRAW;
}
else if ( (CDDS_ITEMPREPAINT) == pLVCD->nmcd.dwDrawStage )
{
COLORREF crText;

crText = RGB(255,0,0);

pLVCD->clrText = crText;

*pResult = CDRF_DODEFAULT;
}

thanks Smile | :)

Re: Custom Draw in CListView

11-Aug-01 8:09

It found out again, no more help needed Smile | :)

How to search for multiple file types?

James Spibey11-Aug-01 5:44

James Spibey

11-Aug-01 5:44

Hi,

How can I use CFileFind to search for more than one type of file at once - like if I want to search for .cpp and .h files in one sweep. I know I can create a class for each search but on a global search that will require searching my whole computer for each file type.

Cheers

James

How can I do to know how datas is in my serial buffer when I use CreateFile ?

youssef11-Aug-01 5:36

youssef

11-Aug-01 5:36

Hi,

I would like the command for know how datas I have in my serial buffer .

Thanks

youssef

Re: How can I do to know how datas is in my serial buffer when I use CreateFile ?

Tim Deveaux11-Aug-01 7:32

Tim Deveaux

11-Aug-01 7:32

One way is to call ClearCommError. This will fill a COMSTAT structure, whose cbInQue member will then hold the number of chars in the buffer.

Re: How can I do to know how datas is in my serial buffer when I use CreateFile ?

youssef11-Aug-01 23:28

youssef

11-Aug-01 23:28

Dear,

Thank you for your answer.
I use ClearCommError, COMSTAT and cbInQue;

Best regards

youssef

List control in LVS_REPORT doesn't show all my columns

Wim Jans11-Aug-01 5:10

Wim Jans

11-Aug-01 5:10

Hello,

I've a problem when using a list control in report mode.
If I use distinct values for the first column (col 0), all my other columns are filled in correctly.
If I have several equal values in the first column, some other columns are blank. Only the last line of a distinct value is shown.

eg.
value1 <empty> <epmty>
value1
value2
value3 <empty> <empty>
value3

It's like he tries to group my values.
As I said before, this doesn't happen when I have all different values in the first column.

I use a LVIF_TEXT mask to insert my values, using InsertItem for the first column and setItem for the consecutive columns.

Anyone an idea Confused | :confused:

Thanks

Wim

Re: List control in LVS_REPORT doesn't show all my columns

Wim Jans11-Aug-01 5:12

Wim Jans

11-Aug-01 5:12

Oeps, forgot to escape something

value1 <empty> <epmty>
value1 <a value> <a value>
value2 <a value> <a value>
value3 <empty> <empty>
value3 <a value> <a value>

Blush | :O

Wim

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