|
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 
Gavin
|
|
|
|
|
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
|
|
|
|
|
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
|
|
|
|
|
You can see how to do this in MSDN topic CWinApp::GetPrinterDeviceDefaults.
|
|
|
|
|
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
|
|
|
|
|
sorry, the window changed when post above message.
It looks like:
111111111111133333
111111111111133333
111111111111133333
111111111111133333
222222222222222222
222222222222222222
chen
|
|
|
|
|
Thanks1
|
|
|
|
|
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  better...
Even if you win the rat race, you're still a rat.
|
|
|
|
|
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!
|
|
|
|
|
|
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 ) 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.
Cryst
|
|
|
|
|
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");
BSTR bsData = m_html.AllocSysString();
hr = SafeArrayAccessData(psa, (LPVOID*)¶m);
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 
Regards
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
|
|
|
|
|
Okay, this is a sorta make-shift work-around 
void CReportView::OnInitialUpdate()
{
CHtmlView::OnInitialUpdate();
Navigate2(_T("about:blank"),NULL,NULL);
}
That's all
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 
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
|
|
|
|
|
An off topic question - how did you get your code snippet nicely formatted?
Gavin
|
|
|
|
|
|
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
|
|
|
|
|
When this happens, close VC and delete project files *.aps, *.ncb, *.opt. Open project again - it should work properly.
|
|
|
|
|
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.
|
|
|
|
|
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
|
|
|
|
|
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.
|
|
|
|
|
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.
|
|
|
|
|
Hi,
I am trying to write a small utility that allows users to customise the icon of my program, which is a precompiled EXE (similar in function to MicroAngelo etc, but much simpler, with only the option of choosing the new icon, which will then be applied to the EXE). I believe UpdateResource() can do this for NT (and the _UpdateResource class over at http://www.codeguru.com/misc/resources.html does pretty much the same for Win 9x). However, I can't figure out how to use UpdateResource correctly. I can't even get the sample code from MSDN to compile correctly.
Could anybody tell me how I can use BeginUpdateResource(), UpdateResource() and EndUpdateResource() to swap the icon in an EXE file for another .ico file (ie the end user will just have to select an .ico file)?
Many, many thanks to anybody who can help or give me any pointers.
All the best,
KB
|
|
|
|
|
How To Code a Meter To Track the Amount of Data Sent/ Recd from some Internet Connection
Manish Bhatia
|
|
|
|
|
Scenario :-
Main Dialog -> Child Dialog
[Means we have a main CDialog derived modal dialog, which brings up a second modal child dialog]
Child Dialog - CFrameWnd derived class F
[The child dialog creates and shows a CFrameWnd derived class F
in F's OnCreate() we do this :-
We create a CHtmlView derived class.
This is done calling CHtmlView::Create(...)
Now the problem is that Create fails and returns false
If I bring it up from the main dialog, it works.
It only fails when I bring it up from the 2nd dialog
Is there any way to figure out why and how Create is failing
This project is compiled with the /clr option by the way as it uses a good amount of managed code. Thus the debugging features are sorta mostly useless.
I created a test dialog app, added a child dialog and popped up a frame window with the CHtmlView derived view and made it a /clr app. That worked with no issues at all.
Do you guys think that with all the managed code, I am causing some kinda memory overflow or some other problem for MFC???
I feel miserable!
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
