C / C++ / MFC Discussion Boards

Williams23-Jul-02 2:48

23-Jul-02 2:48

Hi,
Can someone tell me how can I get the width of a text to one determined font, cause I want to draw a rectangle that just fit around the text. Cool | :cool:

Re: CDC::GetTextExtent equivalent in GDI+

567890123423-Jul-02 3:19

5678901234

23-Jul-02 3:19

Graphics::MeasureString

Re: CDC::GetTextExtent equivalent in GDI+

Williams23-Jul-02 3:35

Williams

23-Jul-02 3:35

Very thanks!!!;)

I have a problem wint CSingleDocTemplate

cycosi23-Jul-02 2:48

cycosi

23-Jul-02 2:48

Hi.
I have a problem with my SingleDocTemplate applicaation.
When I quit, I have the following message in the debug window:
Warning: destroying CSingleDocTemplate with live document.
This causes a memory leak with my document.
I tried to solve it for 3 days, but can't make it work.
Please help me.
OMG | :OMG:

Is this a genuine memory leak?

Gavin Jerman23-Jul-02 2:44

Gavin Jerman

23-Jul-02 2:44

BoundsChecker is reporting the following code as a memory leak:

void foo()
{
_bstr_t bstrA;
_bstr_t bstrB;

bstrA = "Fred";
bstrB = "Wilma";

bstrB = bstrA.copy(); // this causes the leak
// this fixes the leak - bstrB = bstrA
}

At first I thought it was a leak, then I decided it wasn't, now I can't decide! Is it, or isn't it Confused | :confused:

Gavin

Re: Is this a genuine memory leak?

Tim Smith23-Jul-02 2:58

Tim Smith

23-Jul-02 2:58

Yes, that will leak. "copy" will create a copy and then the assignment will create another copy since it can not assume that the original is free for ownership.

bstrB = bstrA;
bstrB .Attach (bstrA .copy ());
bstrB = bstrA .copy (false);

These should all work just fine. But I don't do a lot of _bstr_t work.

Tim Smith

"Programmers are always surrounded by complexity; we can not avoid it... If our basic tool, the language in which we design and code our programs, is also complicated, the language itself becomes part of the problem rather that part of the solution."
Hoare - 1980 ACM Turing Award Lecture

Changing to Landscape for Printing

Desmond Mardle23-Jul-02 2:41

Desmond Mardle

23-Jul-02 2:41

I have spent a few hours trying to change the printed page to Landscape.
I have tried setting the dmorirntation in the DEVMODE structure but it made no difference. I can not seem to get to the print setup dialog info.

Could you please help by telling me how to change the page orenientaion to landscape so when I define may printed page in OnPrint and view it in print preview it is correct.

any help would be appreciated.

Desmond Mardle

Re: Changing to Landscape for Printing

567890123423-Jul-02 3:23

5678901234

23-Jul-02 3:23

You can see how to do this in MSDN topic CWinApp::GetPrinterDeviceDefaults.

Image size tracker problem

chen23-Jul-02 2:02

chen

23-Jul-02 2:02

Hi,

In a dialog based application, I have three resizable windows.
The first one is used for a 2D curve and it can be resized in both of x-axis and y-axis directions. The second window (image container) only can be resized at x-axis and the third window only can be resized in y-axis direction. This looks like follows:

********************
* * *
* curve (1) *(3) *
* * *
* * *
********************
* image (2) *
* *
********************

Also I can change the size of the bmp image by using StretchBlt
function.
Now, I hope that the length of the image (not the length of the second window) should follows the length of the first window in the case of resizable of whole window.
How should i do this? How can i get the length of the first window?

Thanks in advance!

chen

Re: Image size tracker problem

chen23-Jul-02 2:13

chen

23-Jul-02 2:13

sorry, the window changed when post above message.
It looks like:

111111111111133333
111111111111133333
111111111111133333
111111111111133333
222222222222222222
222222222222222222

chen

I'm a beginner,who can explain the VARIANT STRUCT to me? Thanx!

glinda23-Jul-02 1:41

glinda

23-Jul-02 1:41

Thanks1

Re: I'm a beginner,who can explain the VARIANT STRUCT to me? Thanx!

Navin23-Jul-02 2:23

Navin

23-Jul-02 2:23

It has to do with COM and Automation. It is basically just a wrapper for any possible type of data you can transmit through Automation. I think it was designed like that to work with Visual Basic Dead | X|

better...

Even if you win the rat race, you're still a rat.

Re: I'm a beginner,who can explain the VARIANT STRUCT to me? Thanx!

glinda23-Jul-02 16:25

glinda

23-Jul-02 16:25

I want to make a serial port communication program. I define a STRUCT variable
struct _COMM_PACK
{
char sID[PACK_ID_LEN];
BYTE cCmdCode;
UINT nVerifySum;
int nDataLen;
BYTE cData[MAX_DATA_LEN];
}aSendPack;
and want to send 'aSendPack'in the Mscomm control-comm like:
comm.SetOutput(aSendPack);
but the SetOutput need a VARIANT variable
how can I do that?
thanx!

Re: I'm a beginner,who can explain the VARIANT STRUCT to me? Thanx!

Le centriste23-Jul-02 3:39

Le centriste

23-Jul-02 3:39

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wcedcom/htm/cerefVARIANTVARIANTARG.asp

Michel

It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.

- TreeBeard

Standard checkbox and radio images

Aggtaa23-Jul-02 1:16

Aggtaa

23-Jul-02 1:16

Could anyone tell me, where does windows store its default checkbox and radio images?
I've found some odd resources in ctl3d32.dll (these seem to be pre-win32), some in ctl32v2.dll (this even is not a valid PE Smile | :)

) and some in mfc42.dll. But 1st) i cant believe that non-mfc progs use this library, and 2nd) it hardly can believe that win produce grayed copies of these (for pressed-and-holding-buttons) on the fly.
The main purpose of this quest is creation of owner-drawn button, but I dont want to follow Davide Pizzolato's footsteps and include images as resources in built project like he did in his CxShadeButton.
Confused | :confused:

Cryst

Puzzling OnInitialUpdate() behavior for CHtmlView derived class

Nish Nishant23-Jul-02 1:15

Nish Nishant

23-Jul-02 1:15

Here is my code :-

void CReportView::OnInitialUpdate()
{
    Navigate2(_T("about:blank"),NULL,NULL);
     
    IHTMLDocument2 *pDoc=(IHTMLDocument2 *)GetHtmlDocument();        
    if(!pDoc)
    {        
        return;
    }    

    HRESULT hr;
    SAFEARRAY* psa = SafeArrayCreateVector(VT_VARIANT, 0, 1);
    VARIANT *param;    

    MessageBox("L"); // If I comment out this line it fails

    BSTR bsData = m_html.AllocSysString();
    hr =  SafeArrayAccessData(psa, (LPVOID*)&param);
    param->vt = VT_BSTR;
    param->bstrVal = bsData;
    hr = pDoc->write(psa);
    hr = pDoc->close();
    SysFreeString(bsData);
    SafeArrayDestroy(psa);        
}

You can see the MessageBox call there. If the MessageBox is there, it works right and shows the html rendering of the source contained in m_html which is a CString. If I remove the MessageBox, the html comes rightly for about 0.005 seconds [approximate guess] and then it becomes blank Frown | :-(

Regards
Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Puzzling OnInitialUpdate() ... [work-around]

Nish Nishant23-Jul-02 1:39

Nish Nishant

23-Jul-02 1:39

Okay, this is a sorta make-shift work-around Smile | :)

void CReportView::OnInitialUpdate()
{
	CHtmlView::OnInitialUpdate();

	Navigate2(_T("about:blank"),NULL,NULL);	
}

That's all Smile | :)

Now I have my own

void CReportView::RenderView()
{
...
...
}

This has sorta solved the issue. I call RenderView when I want to change the contents

Nish Unsure | :~

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Puzzling OnInitialUpdate() behavior for CHtmlView derived class

Gavin Jerman23-Jul-02 4:16

Gavin Jerman

23-Jul-02 4:16

An off topic question - how did you get your code snippet nicely formatted?

Gavin

Re: Puzzling OnInitialUpdate() behavior for CHtmlView derived class

Nish Nishant23-Jul-02 6:38

Nish Nishant

23-Jul-02 6:38

Using the PRE tag Smile | :)

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Getting the class In the class view.

grshankar23-Jul-02 1:13

grshankar

23-Jul-02 1:13

Hai,
My class(eg.CMyView) is not looking in the class view. It is getting disapeared all of a sudden and I'm not able to get context sensitive help
also. This is happening to me frequently these days.

Ravi shankar

Re: Getting the class In the class view.

567890123423-Jul-02 3:51

5678901234

23-Jul-02 3:51

When this happens, close VC and delete project files *.aps, *.ncb, *.opt. Open project again - it should work properly.

No don't

Abin23-Jul-02 12:40

Abin

23-Jul-02 12:40

Don't need to close the project and do those stuff, all you need to do are the following:

1, Use "file view" to open the header file of that "disappeared" class.

2, Intentionally produce at least one error in that header file, for example, type a few dummy characters somewhere. Build your project, and of course you'll get some compiler errors, good!

3, Clean the error(Remove those dummy characters you typed), rebuild your project again.

That's it. Now go to "class view" and you'll see that class appears again.

How to implement Drag and drop

Bhikshapathi Gorantla23-Jul-02 0:53

Bhikshapathi Gorantla

23-Jul-02 0:53

Hi I want to create an explorer like application in that I want one more

pane at right side and if I select some items displayed in the second

pane and drag them into third pane I should be able to copy them into

some other location and I should see those dragged items in the third

plane.How can Ii chieve using MFC classes?
Please help me in this reagard or show me any code which is built

already in the form of dlls or whatsoever so that I can use it simply

in my application.
Thanks in advance,
regards
Pathi

Pathi

Re: How to implement Drag and drop

cycosi23-Jul-02 2:45

cycosi

23-Jul-02 2:45

Hi.
You can use the Ole drag and drop.
It's a little tricky at first, but works fine.
You can find some example on this web site.
Search for Ole Drag and Drop.
Here's a tip.
Add the methos OnDragEnter(...) and OnDragOver(...), in your drop target, and add the following code in it:
return DROPEFFECT_COPY (or MOVE).
It took me 3 days to find that.
I hope this helps. Cool | :cool:

Updating records in CArrayRowset

User 2237023-Jul-02 0:52

User 22370

23-Jul-02 0:52

Hi,

I am using a CArrayRowset to populate rows in a virtual listview from a Jet 4.0 database.

As the user moves back and forth through the list the underlying CArrayRowset is left pointing to the furthest record loaded sequentially from the database.

My question is about updating data. The user selects an item in the listview which is different to the record currently pointed to by CArrayRowset, this item is cached in the CArrayRowset and so does not cause the record pointer to move.

To update this I need to be able to move the CArrayRowset's record pointer to the selected record and this is the bit I can't quite work out - I've looked at the CBookmark class briefly but it seems to me that in order to get a bookmark to the required row, I'd have to be on the row anyway which kinda defeats the whole purpose - maybe I'm misunderstanding the use of this class.

Can anyone help me with this one? I've done a quick search through deja but not found a great deal of information. This isn't the first time I've hit this issue with CArrayRowset, in the past I've avoided the problem by using a second rowset to edit the record, this worked OK because the listview contained lots of columns and a row displayed an editing dialog.

In this case, however, I want the editing to be inplace and using a second rowset seems a bit messy, especially when considering how to handle deletions.

Thanks for reading this message.

Regards,

Jason Wilden.

modified 10-Jul-19 21:02pm.

Last Visit: 31-Dec-99 18:00 Last Update: 11-Jun-24 0:09

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