Iam totally in confusion .......Pls help me

[jennie]

Pls see the code.Iam opening the ContactsDataBase and getting the FirstName field text from the records and encrypting the FirstName.
If only one contact is present in the PhoneBook,its encrypting successfully.But when more than 1 contact is present in the PhoneBook only 1contact is encrypting and the emulator crashes with "user 42" Panic error.

// Read name of the default database
_LIT( KOrgContactFile,"" );
TBuf<KMaxDatabasePathAndNameLength> orgContactFile( KOrgContactFile );
CContactDatabase::GetDefaultNameL( orgContactFile );
orgContactFile.LowerCase();
if ( iContactDb )
{
if ( !iDbName.Compare( orgContactFile ) )
{
return;
}
iContactDb->CloseTables();
delete iContactDb;
iContactDb = NULL;
}
//Open the Default DataBase
TRAPD(err, iContactDb = CContactDatabase::OpenL( orgContactFile );
// Check if database already exist
if ( err != KErrNotFound )//If the DataBase already Exists then Read Contacts From the DataBase
{
iContactDb->SetDbViewContactType( KUidContactCard );
TFieldType aFieldType1( KUidContactFieldFamilyName );//FirstName
TFieldType aFieldType2( KUidContactFieldGivenName );//LastName
CContactDatabase::TSortPref sortPref1( aFieldType1 );
CContactDatabase::TSortPref sortPref2( aFieldType2 );
// Sort contacts by Family and Given Name
CArrayFixFlat<CContactDatabase::TSortPref>* aSortOrder =
new (ELeave) CArrayFixFlat<CContactDatabase::TSortPref>(2);
CleanupStack::PushL( aSortOrder );
aSortOrder->AppendL( sortPref1 );
aSortOrder->AppendL( sortPref2 );
// The database takes ownership of the sort order array passed in
iContactDb->SortL( aSortOrder );
// The caller does not take ownership of this object.
// so do not push it onto the CleanupStack
const CContactIdArray* contacts = iContactDb->SortedItemsL();
// Go through each contact item and
const TInt nc( contacts->Count() );
for(TInt i=0; i <= nc-1; i++)
{
CContactItem* contact = NULL;
// The caller takes ownership of the returned object.
// So push it onto the CleanupStack
contact = iContactDb->OpenContactL( (*contacts)[i] );
CleanupStack::PushL( contact );
//This is used to get the count of Fields in a Record
CContactItemFieldSet& fieldSet = contact->CardFields();
//Now get the Text of Fields in a Record
HBufC* firstNameBuf = NULL;
HBufC* lastNameBuf = NULL;
// Get first name
TInt findpos( fieldSet.Find( KUidContactFieldGivenName ) );
// Check that the first name field is actually there.
CContactTextField* firstName;
// Check that the first name field is actually there.
if ( (findpos > -1) || (findpos >= fieldSet.Count()) )
{
CContactItemField& firstNameField = fieldSet[findpos];
firstName = firstNameField.TextStorage();

//Get the FirstName Text to firstNameText
TPtrC firstNameText = firstName->Text();
TInt firstNameTextLength = firstNameText.Length();

//Store the FirstNameText to unsigned char
unsigned char *encryptdata = new unsigned char;
for( TInt item=0;item<firstNameTextLength;item++)
{
encryptdata[item] = (unsigned char)firstNameText[item];
}

unsigned char *DKey = new unsigned char [16]; //to store Key

//Generate Key
KeyGen(DKey, 16);

//Passing the Key and Encrypting the FirstNameText
Encrypt(encryptdata,dwDataLength,DKey);

TBuf8<100>DataEncryption;
DataEncryption.Copy(encryptdata);
TBuf<100>DataAfterEncryption;
DataAfterEncryption.Copy(DataEncryption);

//Set the Encrypted text to FirstName
firstName->SetTextL(DataAfterEncryption);

//Allocate the FirstName Text to firstNameBuf
firstNameBuf = firstName->Text().AllocLC();
}

[kiran10182]

I have done it before few months.

Check this Wiki Article: Encrypt-Decrypt Contact Database

I hope it will help you at some extent.

Kiran.

[jennie]

Hai Kiran,
Thanks for ur help.Iam able to get all the fields text and Encrypt .But in my application Iam using my own AES Algorithm to encrypt the data.

Its Prototype:
int Encrypt(unsigned char pbData[], unsigned long dwDataLen, const unsigned char*pbIV);

So I try to get the Text from TPtrc to unsigned char*.Upto some extent its working but the emulator crashes with "User 42" Panic Error.

CContactDatabase *contactDB = CContactDatabase::OpenL();
CleanupStack::PushL(contactDB);
TContactIter iter(*contactDB);
TContactItemId aContactId;
const CContactIdArray* contactArray = contactDB->SortedItemsL();
TInt cnt=contactArray->Count();
for(TInt i=0;i<cnt;i++)
{
CContactItem* contactItem=NULL;
contactItem= contactDB->OpenContactL((*contactArray)[i]);
CleanupStack::PushL(contactItem);
CContactItemFieldSet& fieldSet= contactItem->CardFields();
TInt fieldCount=fieldSet.Count(); // This will give number of contact fields.
for(TInt index=0; index < fieldCount; index++)
{
CContactItemField& field = fieldSet[index];
const CContentType& type = field.ContentType();
if(!(type.ContainsFieldType(KUidContactFieldBirthday)))
{
TPtrC name = contactItem->CardFields()[index].TextStorage()->Text();

TInt FieldTextLength = name.Length();
unsigned char *encryptdata = new unsigned char;
for( TInt item=0;item<FieldTextLength;item++)
{
encryptdata[item] = (unsigned char)name[item];
}

Encrypt(encryptdata,dwDataLength,DKey);

TBuf8<70>DataAfterEncryption;
DataAfterEncryption.Copy(encryptdata);
TBuf16<70> aValue;
aValue.Copy(DataAfterEncryption);contactItem->CardFields()[index].TextStorage()->SetTextL(aValue);
}
} //Inner for loop ends here
contactDB->CommitContactL(*contactItem);
CleanupStack::PopAndDestroy(contactItem
} //Outer for loop ends here
CleanupStack::PopAndDestroy(contactDB);

[kiran10182]

Hi Jennie,

...Upto some extent its working but the emulator crashes with "User 42" Panic Error.

Clean/Re-Build the project. Also debug your application. Finally deploy it on real device and then see the behavior.

PS: Please take a backup of your contacts.

Kiran.

[jennie]

Yes Kiran,I Debug the code.But not understanding Why the emulator crashes.While Decrypting also Iam observing the same behaviour.

[jennie]

Hai Kiran,
I changed the line
unsigned char *encryptdata = new unsigned char;

to

unsigned char *encryptdata = new unsigned char[100];

now the "User 42" error is not occuring.Encryption and decryption is happenning.But after decryption the contact name is appended with some extra characters.
(Suppose if the contact name is Raj Rani after decryption the name is becoming "RajXp Ranipppppppppp").Pls help me to solve this.

[wizard_hu_]

You should preserve the length of contact fields. Try Copy(encryptdata,FieldTextLength).