C / C++ / MFC

activex ctrl in modeless dialog

27-Oct-04 1:25

If the code is no too long, post the .h and .cpp files from your dialog class. This can help us a lot Smile | :)

sarath_babu27-Oct-04 0:27

sarath_babu

27-Oct-04 0:27

CFile

vc-programmer-26-Oct-04 22:28

26-Oct-04 22:28

how to update CFile in vc++.
i want to change data.

(for example)
//existing data
dataid=1
datades=data1

//updating data
dataid=1
datades=dataone

CFile is like as sql have new,delete,update.
i know only create file, read file.
i don't know update file.
vc++ have update file or not.

Re: CFile

ytod26-Oct-04 22:44

ytod

26-Oct-04 22:44

The Simplest way to do so is to open the file again and then write your new data. Actually, I always did so in the following way...;P

SOMETYPE SomeFunction()
{
CFile l_File; // local CFile object
l_File.Open( "C:\\FileName.txt",
CFile::modeCreate | CFile::modeReadWrite );
// using the open flags CFile::modeCreate OR CFile::modeReadWrite
// wrting your file by calling CFile::Write()
...
}

Re: CFile

vc-programmer-26-Oct-04 22:59

implicit pointer conversion

26-Oct-04 22:59

Sir...
my existing create code is following..
void ARMManagementRecords::SaveDomains()
{
// For domains
BOOL bCanSave = FALSE;

UINT nFlags = CFile::typeBinary | CFile::modeWrite;

// file doesn't exist, so create it
if (_access(DATA_FILE_DOMAIN, 0))
{
nFlags |= CFile::modeCreate;
bCanSave = TRUE;
}
else
{
bCanSave = CanSerializeDomain();
}

if (bCanSave)
{
CFile file;
CFileException fe;

// file exists with read & write permissions
if (file.Open(DATA_FILE_DOMAIN, nFlags, &fe))
{
CArchive arDomain(&file, CArchive::store);
//CStringArray m_domainArray;
m_domainArray.Serialize(arDomain);
}

file.Close();
}
}

Re: CFile

vcplusplus27-Oct-04 3:10

vcplusplus

27-Oct-04 3:10

vc-programmer- wrote:
CFile is like as sql have new,delete,update.

Here is a list of all the methods for CFile.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_mfc_cfile_class_members.asp[^]

pesho293226-Oct-04 21:55

pesho2932

26-Oct-04 21:55

does anybody have an idea why c++ would not allow the following:

const char * * cp = NULL;
char * * p = NULL;

cp = p;

i'm getting really disappointed by the language... only intelligent ideas, please! D'Oh! | :doh:

Re: implicit pointer conversion

geo_m26-Oct-04 23:14

geo_m

26-Oct-04 23:14

because if this would be allowed, you'll be able to modify the const objects.
See:

<br />
const char p1 = 'a'; //constant it should never change<br />
char* p2;<br />
const char** p3 = &p2;    // this is illegal<br />
*p3 = &p1;    // now p3 points to 'a'<br />
*p2 = 'b'; // now we have modified 'a'<br />

Normally C++ standard allows you to cast from char* to const char* as it only adds the const. But the conversion from char** to const char** is problematic as you can see above.

[example taken from compl.lang.c++]

Re: implicit pointer conversion

pesho293227-Oct-04 0:13

pesho2932

27-Oct-04 0:13

ok.. i see now.. thanks

EnableWindow in vc++

vc-programmer-26-Oct-04 21:24

26-Oct-04 21:24

//this is tree view class
//CLeftTreeCtrl class
void CLeftTreeCtrl::EditCategory()
{
CAddDlg dlg; //call dialog
dlg.GetDlgItem(IDC_COM1)->EnableWindow(FALSE);
}

when i run my mdi application,it have no error.
but i call dialog, my application is not work.
i don't know.what happen??

Cedric Moonen26-Oct-04 21:31

26-Oct-04 21:31

You need to call dlg.DoModal in order to make your dialog appear on the screen. But as DoModal doesn't return until the user close it, you'll need to call GetDlgItem(IDC_COM1)->EnableWindow(FALSE); in the OnInitDialog from your dialog.

Hope this helps...

vc-programmer-26-Oct-04 21:50

26-Oct-04 21:50

-sometime EnableWindow is (FALSE)
-sometime EnableWindow is (TRUE)
how to control this??
OnInitDialog is only one time or not.
onther class is control dialog EnableWindow or not.

//my code
//LeftTreeCtrl.h
void CLeftTreeCtrl::EditCategory()
{
CAddCategoryDlg dlg;
dlg.m_strcom1=cry->m_strCom;
dlg.GetDlgItem(IDC_COM1)->EnableWindow(FALSE);
if (IDOK == dlg.DoModal())
{
//code
}
}
void CLeftTreeCtrl::AddCategory()
{
CAddCategoryDlg dlg;
dlg.m_strcom1=cry->m_strCom;
dlg.GetDlgItem(IDC_COM1)->EnableWindow(TRUE);
if (IDOK == dlg.DoModal())
{
//code
}
}

i wrote this two function.
this is not access.
Other class can not control other dialog class.
please answer me.

Cedric Moonen26-Oct-04 22:03

26-Oct-04 22:03

Yes, OnInitDialog is just called once when you call DoModal. But, when you create your dialog again, it is of course called again. If you want to enable or disable your control but without knowing it before, I suggest you to add a member variable to your class dialog (say bEnable for example) and add a member function:

void CYourDialog SetEnabled(BOOL bEn) { bEnabled = bEn; }. So you call this member function before calling DoModal (and after creating your dialog) and then, in OnInitDialog, add this:
...->EnableWindow(bEnabled);

vc-programmer-26-Oct-04 22:15

Find changed Control on Dialog.

26-Oct-04 22:15

thank you so much...
working my application..

Sumit Kapoor26-Oct-04 20:59

Sumit Kapoor

26-Oct-04 20:59

Hi..
How to find any control on dialog has changed without tracking setfocus() lostFocus() of each control. As there are too many screens & too many controls on those screens. I just find out, if need for Save on OK Button or not needed.

I'm saving data when user press OK.. I want to check that if user changed something then only I run sql to update otherwise nothing should be done...

Can anybody help me?
Regards
Sumit Kapoor

Never consider anything impossible before trying to solve that..---Sumit Kapoor--- sumit_kapoor1980@hotmail.com

Re: Find changed Control on Dialog.

Cedric Moonen26-Oct-04 21:10