C / C++ / MFC

23-Sep-03 0:28

CPaintDC dc(this);<br />
<br />
CRect r(0,0,10,10);<br />
CBrush brush(RGB(0,0,0));<br />
<br />
dc.FillRect(&r,&brush);<br />

This piece of code draws a filled rectangle at position 0,0.

How can I change the offset of the DC, that the rectangle will paint at, for instance, (x50,y50), without changing the CRect object itself?

I've tried some of the OffsetViewportOrg and SetWindowOrg methods, but I can't seem to make it work. It only changes the clip region.

I've tried SetBrushOrg too, together with Unrealize and SelectObject, but that doesn't change anything at all. If I read the msdn right, this is the function to use! But how?

How can I change the DC's offset?

using: [VISUAL STUDIO 6.0 sp5] [WIN98/2]

vcplusplus23-Sep-03 3:14

23-Sep-03 3:14

Did you try SetViewportOrg()?

Did you check your "Mapping Modes"?

Remember (0,0) is the upper left corner of the screen and the default mapping mode is MM_TEXT. This means X+ goes from left to right and y+ goes from top to bottom.

The scribble tutorial might give you some ideas.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vctutor98/html/_gs_scribble_tutorial.asp

Zizilamoroso23-Sep-03 3:29

23-Sep-03 3:29

dwccgc wrote:
Did you try SetViewportOrg()?

Yes, it only moves the clip rectangle. The rectangle itself is still painted at 0,0.

dwccgc wrote:
Did you check your "Mapping Modes"?

Mapmode is 1 (==MM_TEXT).

I think I have to use the SetBrushOrg, but that doesn't seem to work.

using: [VISUAL STUDIO 6.0 sp5] [WIN98/2]

vcplusplus23-Sep-03 7:21

23-Sep-03 7:21

I found some old code where I draw a Polygon. I use CClientDC instead of CPaintDC.

CMyView::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)
{

   CClientDC dc(this);
   ..
   ..
   CRect rcArea(lpDrawItemStruct->rcItem);
   rcArea.DeflateRect(20, 20);
   dc.SetViewportOrg(rcArea.left, rcArea.bottom);
   ..
   ..
   dc.Polygon(PolyPoints.pt, PolyPoints.nCoord);
   ..
   ..
}

Did you have any luck with that MS Scribble Link I left on the previous message?

Zizilamoroso24-Sep-03 0:08

24-Sep-03 0:08

I'll try it.

No, I don't have the examples, and there's no download at that page.

using: [VISUAL STUDIO 6.0 sp5] [WIN98/2]

vcplusplus24-Sep-03 1:56

24-Sep-03 1:56

Here is a link to the sample files;

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample98/html/_sample_mfc_scribble.asp

You can also find the samples on your MSDN Library Disks

Good Luck

Zizilamoroso24-Sep-03 5:25

SAS Window: Winlogon.exe Application error.

24-Sep-03 5:25

dwccgc wrote:
You can also find the samples on your MSDN Library Disks

I know, but I don't have the disks either...

But, meanwhile, I found a solution (workaround).

Instead of this:

CPaintDC dc(this)<br />

Use this:

PAINTSTRUCT ps;<br />
CDC* pDC=NULL;<br />
pDC=BeginPaint(&ps);<br />
<br />
...<br />
<br />
EndPaint(&ps);<br />

With the second code, the DC's offsets work the way they should. I don't know why they don't work with CPaintDC (nor CClientDC).

using: [VISUAL STUDIO 6.0 sp5] [WIN98/2]

rohit.dhamija22-Sep-03 23:42

rohit.dhamija

22-Sep-03 23:42

Dear ALL,

I am developing an application for Windows 2000 in MFC VC++ Version 6.0.

My application runs as an interactive service.

I am using a dll in my program which is used to hide given key(s) from the registry. The program works fine and hides the given keys from registry. But when i log off my system and login, the following error occurs:
...............................
SAS Window: Winlogon.exe Application error.
The instruction at "0x01007f2d" refereced memory at "0x00006c". The memory could not be read. Click ok to close and cancel to debug.
...............................
On clicking ok the system restarts.

I think I need to free the dll before logging out. So I tried FreeLibrary in QueryEndSession, but it didnot helped.
Is there any other way to free the dll.

Or any other way out to solve the problem ?
The program is working fine when I restart and login (probably because at that time the dll is freed and loaded again,, but the same is not in case of log off and log in)

Thanks
Rohit Rose | [Rose]

Re: SAS Window: Winlogon.exe Application error.

Mike Dimmick23-Sep-03 0:39

Mike Dimmick

23-Sep-03 0:39

'Hide keys from the registry' - explain?

If you're dynamically hiding the ones that WinLogon relies on, this may well be causing this crash.

WinLogon is considered a critical service by Windows NT-based operating systems. The Session Manager subsystem, SMSS.EXE, which starts WinLogon, waits on WinLogon's process handle. If WinLogon (or CSRSS, also a critical service) terminates unexpectedly, SMSS crashes the system (which typically leads to an automatic reboot, if you haven't changed the defaults).

Have you perhaps installed a custom GINA?

Re: SAS Window: Winlogon.exe Application error.

rohit.dhamija23-Sep-03 0:58

rohit.dhamija

23-Sep-03 0:58

Dear Mike,

I have not used custom GINA.

I have used the dll to hide the registry specified keys.
I got it from:
http://www.codeproject.com/system/hidereg.asp

This dll hides a registry string from regedit by hooking the RegEnumValueW API. I used this dll in my application to hide the password string from the registry.

I am loading this dll from my application which is running as an interactive service. As soon as the person opens registry editor , I load the dll and and this dll hides the password string. The program is working fine when i restart my system and login. This is becoz When i restart the system the dll is unloaded automatically , but when i logoff and login , the problem occurs (perhaps becoz the dll is not freed )
What do you suggest ??

Please let me know if my problem is clear or not.

Re: SAS Window: Winlogon.exe Application error.

Mike Dimmick23-Sep-03 7:24

Mike Dimmick

23-Sep-03 7:24

There are better ways to store secret information.

See the documentation for PStore[^], LSA secrets[^] or the Data Protection API[^].

Don't paint the blue "Hi-light" rectangle

Urban Olars22-Sep-03 23:07

Urban Olars

22-Sep-03 23:07

I'm using MFC and VS6. I have a dialog with a list control on. My question is if there is a way to prevent the blue "Hi-light" rectangle from being drawn when I click on an item in the list control? I'm already using CustomDraw to colorize certain rows in it.
Can CustomDraw be used or do I have to use OwnerDraw? I'm a newbie in C++, so I have no experience from OwnerDraw yet.
Would be thankful if someone could point me out in the right direction!

Re: Don't paint the blue "Hi-light" rectangle

Mike Dimmick23-Sep-03 0:03

Mike Dimmick

23-Sep-03 0:03

My simple answer is don't do it. The user will want to know which item in the tree is selected, and is likely to be used to the convention used by Explorer.

If you propose using another form of feedback to indicate the selected item, remember that the user has configured colours in the operating system to indicate selected items - it is not necessarily blue (and may not be for a partially sighted user). To get the appropriate colour, use GetSysColor or GetSysColorBrush with the COLOR_HIGHLIGHT argument.

Re: Don't paint the blue "Hi-light" rectangle

vcplusplus23-Sep-03 1:59