C / C++ / MFC

Re: a question about Edit Box

18-May-04 2:43

Mahendra_786 wrote:
In your Dialog class add this to OnInitDialog:

m_myEdit.SubclassDlgItem(IDC_EDIT1, this);

This is highly unnecessary, and is handled automatically when a member variable is mapped to a control (using ClassWizard).

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Mahendra_78619-May-04 14:15

Mahendra_786

19-May-04 14:15

That is

HIGHLY

correct and
my way in fact may be insufficient not just unnecessary. In fact
DDX_* somewhere calls SubclassWindow to do this.
Moreover the way I suggested I am not sure how
UpdateData will work beside other side-effects.

Due Regards
Mahendra

Administrator Privileges

Deian17-May-04 16:05

17-May-04 16:05

Hello guys and girls Smile | :)

I was wondering if it's possible to programatically adjust the privileges of an application, running on let's say 2K/XP, so it can perform actions like installations and other restricted operations when the app is running at accounts without proper permissions. Is that possible at all?

Any information is appreciated.

Thanks in advance Smile | :)

valikac17-May-04 18:29

valikac

17-May-04 18:29

Maybe it it were running as a service.

Kuphryn

David Crow18-May-04 2:46

18-May-04 2:46

Deian wrote:
I was wondering if it's possible to programatically adjust the privileges of an application...

Check out OpenProcessToken() and AdjustTokenPrivileges().

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Deian18-May-04 5:36

18-May-04 5:36

I use the following code to enable "all" privileges, but still, after enabling them, I can't perform uninstall programatically Frown | :(

What am I doing wrong?

// Get the privileges<br />
DWORD dwLen;<br />
BOOL bRes = FALSE;<br />
HANDLE hToken; <br />
// Get a token for this process. <br />
if (!OpenProcessToken(GetCurrentProcess(), <br />
TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) <br />
{ <br />
	AfxMessageBox("no waaay!");<br />
} <br />
<br />
// obtain dwLen<br />
bRes = GetTokenInformation(<br />
  hToken, <br />
  TokenPrivileges, <br />
  NULL, <br />
  0,<br />
  &dwLen<br />
); <br />
<br />
BYTE* pBuffer = new BYTE[dwLen];<br />
if(pBuffer == NULL)<br />
{<br />
  CloseHandle(hToken);<br />
  AfxMessageBox("no memory");<br />
} <br />
<br />
bRes = GetTokenInformation(<br />
  hToken, <br />
  TokenPrivileges, <br />
  pBuffer,     <br />
  dwLen,        <br />
  &dwLen<br />
);<br />
<br />
if (!bRes)<br />
{<br />
  CloseHandle(hToken);<br />
  delete [] pBuffer;<br />
  AfxMessageBox("Access denied");<br />
} <br />
<br />
// Iterate through all the privileges and enable them all<br />
TOKEN_PRIVILEGES* pPrivs = (TOKEN_PRIVILEGES*)pBuffer;<br />
for (DWORD i = 0; i < pPrivs->PrivilegeCount; i++)<br />
{<br />
  pPrivs->Privileges[i].Attributes |= SE_PRIVILEGE_ENABLED;<br />
} <br />
// Store the information back in the token<br />
bRes = AdjustTokenPrivileges(<br />
  hToken, <br />
  FALSE, <br />
  pPrivs, <br />
  0, NULL, NULL<br />
);<br />
<br />
delete [] pBuffer;<br />
CloseHandle(hToken); <br />
<br />
if (!bRes)<br />
  AfxMessageBox("Access denied");<br />
else<br />
  AfxMessageBox("success");

David Crow18-May-04 6:20

18-May-04 6:20

What is the return value of AdjustTokenPrivileges()?

Deian wrote:
...but still, after enabling them, I can't perform uninstall programatically

What problems are you seeing?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Deian18-May-04 7:01

18-May-04 7:01

Well, the return from the above code is "success". After that if I call GetLastError(), I get "Operation completed successfully". This means that all privileges are enabled, but still, when I try to programatically uninstall any aplication, I get an error, that the app is installed by user with administrative privileges and I can't uninstall such apps Frown | :(

. I'm trying to perform this uninstall under restricted "Guest" account. I'm sure that there is a workaround for that though Frown | :(

David Crow18-May-04 7:48

18-May-04 7:48

Deian wrote:
when I try to programatically uninstall any aplication, I get an error

How are you doing this, and what is the error?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Deian18-May-04 7:57

Re: UNICODE problem: fgetws

18-May-04 7:57

I'm executing the "UninstallString" value from the registry for any application, and it works perfectly - if it's let's say done under privileged account, the error is "A user with administrative privileges has installed this application, you can not uninstall it" or something similar. I get this error *ONLY* under restricted accounts under 2K/XP. It deals with system policy I guess, but I need a workaround so I can perform these "forbidden" actions.

Thanks for the attention and time spent Mr. Crow Smile | :)

UNICODE problem: fgetws

IGx8917-May-04 16:01

IGx89

17-May-04 16:01

I'm trying to read a file (which could be using ANSI or MBCS/UNICODE encoding) using the fgetws function, but am having problems. Here's my code:

FILE *file = fopen(tmp,"r");<br />
wchar_t *line = new wchar_t[2001];<br />
wcscpy(line,L"");<br />
wchar_t buf[501];<br />
while(fgetws(buf,500,file) != NULL)<br />
    wcscat(line,buf);<br />

The problem is that only the first fgetws function call seems to work correctly; all the following calls return semi-invalid strings, almost double-UNICODE encoded: if there are, say, three spaces, they are stored as 00 00 00 32 00 00 00 32 00 00 00 32 in memory! I'm completely new to UNICODE programming, so I certainly could be making a simple mistake; I just haven't been able to find it yet Frown | :(

Mike Dimmick18-May-04 2:58

Mike Dimmick

18-May-04 2:58

If opened in Text mode (the default), the MS C run-time treats the file as if it is ANSI (i.e. encoded using your default locale's character set). fgetws passes the data read through MultiByteToWideChar to get a UTF-16 string.

If the file is already UTF-16, you'll get the wrong answer (what you're seeing here).

Files opened in Binary mode (by adding a 'b' to the mode parameter) are treated as-is, with no conversions. This also means that CR+LF pairs are not converted to line feeds alone: you'll see \r as well as \n.

Stability. What an interesting concept. -- Chris Maunder

Re: UNICODE problem: fgetws

IGx8918-May-04 4:12

IGx89

18-May-04 4:12

Ok, thanks for the help! So I'll just try reading the file as binary, and see how that works.

Is using fgetws the best way to fill a char array with the contents of a file, in a straight-Win32 app?

Reusing a dialog resource in a New Project

jerry1211a17-May-04 15:53

jerry1211a

17-May-04 15:53

I have a dialog resource IDD_FORM_XXX in a project. I want to use this resource in another project. Can I copy the dialog resource into the other project?? I cant figure out how to do it...or how to import it.

Thanks.
Jerry

monrobot1317-May-04 16:31

monrobot13

17-May-04 16:31

If nothing else you could copy the dialog from the resource (.rc) file and paste it into the new project.

- Aaron

jerry1211a17-May-04 16:51

jerry1211a

17-May-04 16:51

I tried that. I dont know why but that will not work.

Jerry

Jason Henderson17-May-04 19:14

Jason Henderson

17-May-04 19:14

Make sure you paste it in the dialog section of the new rc file. You will probably have to modify your resource.h for the IDs too.

"We have done so much in the last 2 years, and it doesn't happen by standing around with your finger in your ear, hoping everyone thinks that that's nice." - Donald Rumsfeld

Jason Henderson
blog

create/control dynamic combo box

Prakash Nadar17-May-04 18:36

Prakash Nadar

17-May-04 18:36

open the two .rc (src and dest) file only in the same IDE.
then drag and drop from one window to another, if you hold the ctrl key down a copy will be made, else the resource will be moved.

Regards.

I'll write a suicide note on a hundred dollar bill - Dire Straits

elephantstar17-May-04 14:06

elephantstar

17-May-04 14:06

Hi there,

Is there a way I can create a CComboBox pointer for a combo box that I have created within Resources? I want to be able to add items dynamically depending on user input. Whey can't it just do that in C++ like it does in ASP for select controls. The reason I ask is because I can't seem to position the dynamic combo box where I would like it. How to I find the coordinates for its position in order to position it properly?

For example, I have created a combo box in a dialog box which I will call IDD_COMBO. Its member variable defined in the header file is m_COMBO. Is it possible to add items to the box without having to create a CComboBox pointer?

Any help would be much appreciated. Thanks!

alex.barylski17-May-04 14:44

alex.barylski

17-May-04 14:44

Right click on your combobox control, click class wizard...then click on member variables tab. Double click on IDD_COMBO in the list below and make sure your categorey is control NOT value.

Otherwise...

CComboBox* pControl = GetDlgItem(IDD_COMBO)
ASSERT(pControl);

pControl->AddString("My string ");

Cheers

How do I print my voice mail?

elephantstar18-May-04 6:17

elephantstar

18-May-04 6:17

I had set the category to control and inserted the 3 lines of code above but it gave me the following error.

Error: cannot convert from 'class CWnd *' to 'class CComboBox *'

Also, how can I apply ON_CBN_SELCHANGE to a dynamic combo box?

Thanks!

alex.barylski18-May-04 7:06

alex.barylski

18-May-04 7:06

If you set the categorey to control, you don't need the control pointer

instead you would

m_ctrlCombo.AddString("");

However, if your categorey was set to value because your relying on MFC's DDX and Updatedata() then keep it that way...so your combo is updated automagically...by the framework...

You will need a pointer if you want to add items dynamically...using AddString()...becuase value will store a member variable of type CString(I think) not CComboBox you can't call the string with a function like AddString...

Cheers Smile | :)

How do I print my voice mail?