Getting the coordinate of a child window - C / C++ / MFC Discussion Boards

tareqsiraj18-Apr-04 3:43

18-Apr-04 3:43

Hi all, I'm developing a filter driver for an audio device and for installation, i'm using and custom made application instead of an inf. For installing the filter driver, I need to insert the service name into the HKLM\CurrentControlSet\Enum\<device-type>\<vendor-id>\<sub-value>. But as i understand, this is a protected area of windows registry and needs permission to be added for the current user. How do i do this in my program? RegOpenKeyEx() fails opening this key. Something like this has been done in an application i ran across a couple of weeks ago (cant seem to find it right now... i think it was from numega). Is there any other suggestions on installing the filter driver? thank you.

-Tareq

Re: Edit the Enum Section of the registry

Antti Keskinen18-Apr-04 6:26

Antti Keskinen

18-Apr-04 6:26

Have you tried installing the filter driver by using an .inf file ? Why can't you use the .inf file ?

I believe you can't write to this area of the registry directly, but your application could try calling RegSrv32 to register the filter driver from it's DLL when it is started, and removing it upon exit ?

Leaving it there is also an option, and you might write a setup program that registers the filter driver if it is not yet registered. And remove it when the application is removed from a system.

If you find the name of the application you mentioned, post it here as well.

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

Re: Edit the Enum Section of the registry

tareqsiraj20-Apr-04 0:09

tareqsiraj

20-Apr-04 0:09

Found this source code that gives you the key for the enum section or subsections. Now looking for a way to be able to write there.
http://www.sysinternals.com/ntw2k/source/accessenum.shtml[^]

-Tareq

Re: Edit the Enum Section of the registry

tareqsiraj21-Apr-04 5:39

tareqsiraj

21-Apr-04 5:39

Got it to work using SetupDiSetDeviceRegistryProperty() ... didnt know of this.

-Tareq

error C2440

ketil b18-Apr-04 3:36

ketil b

18-Apr-04 3:36

Hi All

Im geting the compiler error

error C2440: '=' : cannot convert from 'short (__thiscall CMSComm::*)(void)' to 'short'

on this line

sCommEvent = m_ctlMSComm.GetCommEvent;

sCommEvent is a short and m_ctlMSComm is the control varable for the MSComm ActiveX control

is this error saying it cant convert from a short to a short.

im using VC++ 6

Cherrs Ketil

Re: error C2440

Michael Dunn18-Apr-04 3:58

Michael Dunn

18-Apr-04 3:58

You forgot the parens:

m_ctlMSComm.GetCommEvent()

--Mike--
Personal stuff:: Ericahist | Homepage
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----
Kosh reminded me of some of the prima-donna programmers I've worked with. Knew everything but when you asked them a question; never gave you a straight answer.
-- Michael P. Butler in the Lounge

Re: error C2440

ketil b18-Apr-04 4:17

ketil b

18-Apr-04 4:17

Its OK figerd it out

I will get me cote

Getting the coordinate of a child window

Alton Williams18-Apr-04 3:15

Alton Williams

18-Apr-04 3:15

I having a problem with a control (say an edit box) on a Dialogue or FormView.
in my resource script is as follows

    EDITTEXT        IDC_EDIT1,34,50,26,14,ES_AUTOHSCROLL | NOT WS_BORDER<br />
   PUSHBUTTON      "&Size Info",IDC_SIZE_INFO,69,91,56,26<br />
<br />

I've a handler for the button
as follows:

<br />
void CMyDialog::OnSizeInfo()<br />
{<br />
CRect ButtonRect, EditRect;<br />
CWnd *pEdit = GetDlgItem(IDC_EDIT1);<br />
CWnd *pButton = GetDlgItem(IDC_SIZE_INFO);<br />
pEdit->GetClientRect(EditRect);<br />
pButton->GetClientRect(ButtonRect);<br />
}<br />

<br />
void CMyDialog::OnSizeInfo()<br />
{<br />
CRect ButtonRect, EditRect;<br />
CWnd *pEdit = GetDlgItem(IDC_EDIT1);<br />
CWnd *pButton = GetDlgItem(IDC_SIZE_INFO);<br />
pEdit->GetWindowRect(EditRect);<br />
pButton->GetWindowRect(ButtonRect);<br />
}<br />

<br />
void CMyDialog::OnSizeInfo()<br />
{<br />
CRect ButtonRect, EditRect;<br />
CWnd *pEdit = GetDlgItem(IDC_EDIT1);<br />
CWnd *pButton = GetDlgItem(IDC_SIZE_INFO);<br />
::GetClientRect(pEdit,EditRect);<br />
::GetClientRect(pButton,ButtonRect);<br />
}<br />

<br />
void CMyDialog::OnSizeInfo()<br />
{<br />
CRect ButtonRect, EditRect;<br />
CWnd *pEdit = GetDlgItem(IDC_EDIT1);<br />
CWnd *pButton = GetDlgItem(IDC_SIZE_INFO);<br />
::GetWindowRect(pEdit,EditRect);<br />
::GetWindowRect(pButton,ButtonRect);<br />
}<br />

in all cases the top and left properties are 0 and 0 and not 34 and 50 (EditRect) or 69 and 91 (ButtonRect). How I get this programatically.

Many thanks
Alton

Re: Getting the coordinate of a child window

ohadp18-Apr-04 4:53

ohadp

18-Apr-04 4:53

You can :

CPoint pt(0,0);

child->ClientToScreen(&pt);
parent->ScreenToClient(&pt);

I believe pt will now contain the position of child relative to parent.

urgent help required about LAP link

amir_iiui17-Apr-04 22:21

amir_iiui

17-Apr-04 22:21

i want to buit an application that can connect two pc's using LPT1 using LAPlink cable. can some body send me this source code developed in C++. or help me in any other way.

inheritance problem

kfaday17-Apr-04 16:28

kfaday

17-Apr-04 16:28

Inheritance problem
Hello
I'll describe my problem. I've got a vehicle class (cVehicle), and two 'heirs', car (cCar)and van (cVan). The vehicle class has atributes X and Y, car has C and van has V, and both heirs inherit X and Y.

i have a class called Vehiclefactory which has a method which recieves a string with the atributes and it must return a Cvehicle object. Then i must add it to a list.

<br />
CVehiculo* temp = Vehiclefactory.Create (" string with atributes");<br />
VehicleList.Add (temp);<br />

Inside Vehiclefactory.create function, if i get a string with a C, i must create a car, and if i get a string with a V i must create a van

<br />
if (c==C)<br />
{<br />
        cCar * car = new cCcar(X,Y,C);<br />
        return aut;<br />
}<br />
if (c==V)<br />
{<br />
        cVan * van = new cVan(X,Y,V);<br />
        return van;<br />
}<br />

but the function returns a cVehicle class, so i lost the car or van atribute.

<br />
class cVehiclefactory<br />
{<br />
	private:<br />
	  FILE *data;<br />
	public: <br />
	  void read (char * filename);<br />
	  cvehiculo * Create (char data[51]);<br />
};<br />

i really need the create function to return a Cvehicle class, but i need to actualle return a car or a van, to be able to see its atributes and then to add it to a list. these lines of code must be in the program

<br />
CVehiculo* temp = Vehiclefactory.Create (" string with atributes");<br />
VehicleList.Add (temp);<br />

hope you can help me!!
thanks

Re: inheritance problem

Ravi Bhavnani17-Apr-04 17:36

Ravi Bhavnani

17-Apr-04 17:36

CVehiculo could have a private member (with a public accessor) that specifies the type of class (car/van). This member is set in CVehiculo's constructor. CCar and CVan should pass the appropriate value to CVehiculo's constructor during their own construction.

CCar (c, x, y) :
  CVehiculo (CVehiculo::Type::Car, x, y)
{
  m_c = c;
}

CVan (v, x, y) :
  CVehiculo (CVehiculo::Type::Van, x, y)
{
  m_v = v;
}

You should make CVehiculo's default constructor private, in order to prevent an uninitialized CVehiculo from being created. You could test the type of object returned by the factory by using CVehiculo's accessor, eg:

class CVehiculo
{
  public:
    CVehiculo::Type getType()
      { return m_type; }
   ...
  private:
    CVehiculo::Type m_type;
 }

/ravi

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Re: inheritance problem

monrobot1317-Apr-04 18:16

monrobot13

17-Apr-04 18:16

Shouldn't you be able to just cast the return to the type you want.

- Aaron

Re: inheritance problem

markkuk18-Apr-04 0:19

markkuk

18-Apr-04 0:19

You can use dynamic_cast or the typeid operator to find out the true class of a CVehiculo object. See http://www.icce.rug.nl/documents/cplusplus/cplusplus14.html#l191

How do you add coloring to text...

S^nyp17-Apr-04 15:38

S^nyp

17-Apr-04 15:38

Like in visual studio for c++ docs it adds support for coloring text "for, if..." how can I make the same text coloring by default?

Actual Linux Penguins were harmed in the creation of this message.

Re: How do you add coloring to text...

Dominik Reichl17-Apr-04 22:43

Dominik Reichl

17-Apr-04 22:43

You are looking for a syntax-coloring edit control? Have a look at these:

http://www.codeproject.com/editctrl/brainchild.asp

http://www.codeproject.com/editctrl/crysedit.asp

http://www.codeproject.com/editctrl/scintillawnd.asp

Best regards, Smile | :)

Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

How do you clear recent documents...

S^nyp17-Apr-04 15:35

S^nyp

17-Apr-04 15:35

When I made an MFC app I included support for 4 recent documents but how can you erase these?

Actual Linux Penguins were harmed in the creation of this message.

Re: How do you clear recent documents...

Mike Dimmick18-Apr-04 1:47

Mike Dimmick

18-Apr-04 1:47

I think you'll have to use the undocumented class CRecentFileList, which manages this file list. The file list is owned by CWinApp, which has the m_pRecentFileList member. This member is protected, so you'll have to add code to manipulate it to your application class which derives from CWinApp.

Stability. What an interesting concept. -- Chris Maunder

Multiple dialogs

Ashman17-Apr-04 14:18

Ashman

17-Apr-04 14:18

Hi,
I was wondering how I might be able to have multiple child dialogs opening off of the main dialog?
What I mean is, when I click a button in my main dialog to open another dialog using

CDialog dlg;
dlg.DoModal();

it will open the other dialog but I cannot access the main dialog unless I closed the newly opened one. How can I get around this so I can focus the main dialog when the opened dialog is open?

Thanks
Ash

Re: Multiple dialogs

Maximilien17-Apr-04 14:37

Maximilien

17-Apr-04 14:37

you need to create modeless dialogs ...

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Multiple dialogs

Ashman17-Apr-04 14:39

Ashman

17-Apr-04 14:39

This sounds dumb....but how? hehe

Thanks

Re: Multiple dialogs

Ashman17-Apr-04 14:50

Ashman

17-Apr-04 14:50

Sorry ill rephrase that... how do I make it a modeless dialog?

Re: Multiple dialogs

Ravi Bhavnani17-Apr-04 16:02

Ravi Bhavnani

17-Apr-04 16:02

A nice tutorial on modeless (and modal) dialogs is available here[^].

/ravi

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about reflact message on ComboBox!!

GreenXML17-Apr-04 14:09

GreenXML

17-Apr-04 14:09

i'd like to capture the message when key down or up on ComboBox.
.eg. when press the return key,then add a word to the ComboBox.
and how to capture the return key press?thx

GreenXML

Re: about reflact message on ComboBox!!

Ravi Bhavnani17-Apr-04 17:49

Ravi Bhavnani

17-Apr-04 17:49

Hmmm, you could use GetWindow (GW_CHILD) to get at the combo box's edit control, then subclass that (override it's PreTranslateMessage()) to notify you when the user has pressed [Return].

Please post an article at CP if you get it to work. Thanks!

/ravi

My new year's resolution: 2048 x 1536
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