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Revision as of 13:40, 1 July 2008 by Forum Nokia KB (Talk | contribs)

Creating a password dialog with secret editors using Symbian C++

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Template:KBCS

ID CS001056 Creation date July 1, 2008
Platform S60 3rd Edition, FP1 Tested on devices Nokia N93
Category Symbian C++ Subcategory Files/Data


Keywords (APIs, classes, methods, functions): CAknMultiLineDataQueryDialog, CAknTextQueryDialog, NUMSECRETED, SECRETED, CAknMultiLineDataQueryDialog::ExecuteLD, CAknTextQueryDialog::ExecuteLD

Overview

This code snippet shows how to create a password dialog with secret editors. Numeric secret editors can be defined using s NUMSECRETED resource structure in a resource file and alphanumeric secret editors are defined using a SECRETED resource structure. This code snippet implements two example dialogs with SECRETED structures. The first one is a multiline query dialog containing password and confirmation fields and the second one is a simple text query dialog with one password field.

This snippet can be self-signed.

MMP file

The following libraries are required:

LIBRARY     avkon.lib   //Avkon resources


Resource file

.rss

#define KMaxPasswordLength 10
 
RESOURCE DIALOG r_dialog_password_and_confirmation_query
{
flags = EGeneralQueryFlags;
 
buttons = R_AVKON_SOFTKEYS_OK_CANCEL;
items =
{
DLG_LINE
{
type = EAknCtMultilineQuery;
id = EMultilineFirstLine;
control = AVKON_DATA_QUERY
{
layout = EMultiDataFirstSecEd;
label = "Enter Password:";
control = SECRETED
{
num_letters = KMaxPasswordLength;
};
};
},
DLG_LINE
{
type = EAknCtMultilineQuery;
id = EMultilineSecondLine;
control = AVKON_DATA_QUERY
{
layout = EMultiDataSecondSecEd;
label = "Confirm Password:";
control = SECRETED
{
num_letters = KMaxPasswordLength;
};
};
}
};
}
 
 
RESOURCE DIALOG r_dialog_password_query
{
flags = EAknGeneralQueryFlags;
 
buttons = R_AVKON_SOFTKEYS_OK_CANCEL;
items =
{
DLG_LINE
{
type = EAknCtQuery;
id = EGeneralQuery;
control = AVKON_DATA_QUERY
{
layout = ECodeLayout;
label = "Enter Password:";
control = SECRETED
{
num_letters = KMaxPasswordLength;
};
};
}
};
}


Header file

#ifndef __PASSWORDAPPUI_H__
#define __PASSWORDAPPUI_H__
 
const TInt KMaxPasswordLength = 10;
//...
 
class CPasswordAppUi : public CAknAppUi
{
//...
private:
//...
TBool ShowPasswordAndConfirmationDialogL(TDes& aPassword);
TBool ShowPasswordDialogL(TDes& aPassword);
void UsePasswordDialogsL(); //a test method for dialogs
private:
//...
HBufC* iPassword;
};
 
#endif // __PASSWORDAPPUI_H__


Source file

#include <AknQueryDialog.h>
#include <Password_0xE0859401.rsg>
 
//...
CPasswordAppUi::CPasswordAppUi():iPassword(NULL)
{
}
 
CPasswordAppUi::~CPasswordAppUi()
{
//...
if (iPassword)
{
delete iPassword;
iPassword=NULL;
}
}
 
TBool CPasswordAppUi::ShowPasswordAndConfirmationDialogL(TDes& aPassword)
{
TBuf<KMaxPasswordLength> password;
TBuf<KMaxPasswordLength> confirmation;
 
CAknMultiLineDataQueryDialog* dlg =
CAknMultiLineDataQueryDialog::NewL(password, confirmation);
 
if (!dlg->ExecuteLD(R_DIALOG_PASSWORD_AND_CONFIRMATION_QUERY))
{
//Cancel key pressed
//do something...
return EFalse;
}
else
{
if(password.Compare(confirmation) == 0)
{
//password and confirmedPassword match.
//do something...
 
aPassword.Copy(password);
return ETrue;
}
else if(password.Length() != confirmation.Length())
{
//password buffer and confirmation buffer have different lengths
//do something...
 
return EFalse;
}
else
{
//password buffer and confirmation buffer have different contents
//do something...
 
return EFalse;
}
}
}
 
TBool CPasswordAppUi::ShowPasswordDialogL(TDes& aPassword)
{
TBuf<KMaxPasswordLength> password;
 
CAknTextQueryDialog* dlg =
new(ELeave) CAknTextQueryDialog(password, CAknQueryDialog::ENoTone );
 
if(!dlg->ExecuteLD(R_DIALOG_PASSWORD_QUERY))
{
//Cancel key pressed
//do something...
return EFalse;
}
else
{
//OK do something...
aPassword.Copy(password);
return ETrue;
}
}
 
 
void CPasswordAppUi::UsePasswordDialogsL()
{
//reset old password if exists
if(iPassword)
{
delete iPassword;
iPassword=NULL;
}
 
iPassword = HBufC::NewL(KMaxPasswordLength);
TPtr bufPtr = iPassword->Des();
 
//show password and confirmation dialog and store the given
//password in member variable iPassword if input values are ok
TBool ret = ShowPasswordAndConfirmationDialogL(bufPtr);
 
if(ret)
{
//create a temporary buffer to store the given password
HBufC* tmpPassword = HBufC::NewLC(KMaxPasswordLength);
TPtr tmpPtr = tmpPassword->Des();
 
//show a password dialog
TBool ret2 = ShowPasswordDialogL(tmpPtr);
 
if(ret2)
{
//compare the given password with member variable iPassword
if (tmpPassword->Compare(*iPassword) == 0)
{
//passwords match ok, do something....
}
else
{
//The given password is not correct, do something...
}
}
else
{
//the user pressed cancel, there is no password to compare
//do something...
}
 
CleanupStack::PopAndDestroy(); //tmpPassword
}
else
{
//giving a new password failed, do something...
delete iPassword;
iPassword=NULL;
}
}


Postconditions

The example code shows a password and confirmation dialog to the user and stores the given password into the member variable iPassword. After this, a simple password query dialog is shown to the user.

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