public void BorrowBook()
{
try
{ //show a loading message
View.ShowLoading();
using (IServiceClientProxy proxy = new IServiceClientProxy(binding, new ProtocolVersion11()))
{
//execute the borrow request
int bookId = LibraryModelSingleton.Instance.Book.ID;
int userId = LibraryModelSingleton.Instance.User.ID;
Borrow borrowRequest = new Borrow() { bookID = bookId, userID = userId };
BorrowResponse response = proxy.Borrow(borrowRequest);
//show positive a message if the result is valid otherwise a negative message
//and return in the welcome page
state = InnerState.WELCOME;
string msg = (response.BorrowResult.StartDate.Equals(DateTime.MinValue)) ? BORROW_FAILED_MSG : OPERATION_COMPLETED_MSG;
View.ShowMessageWithButton(msg, () => { View.ShowWelcomePage(); });
}
}
//show a message and then returns in the login page
catch (Exception) { View.ShowMessageWithButton(ERROR_MSG, () => { this.Logout(); }); }
}
public void RecognizeBarcode(Bitmap bitmap)
{
if (state != InnerState.BORROWING && state != InnerState.RETURNING) { throw new InvalidOperationException("The user is in an invalid state!"); }
if (bitmap == null)
{
//invalid request, show in the welcome page
View.ShowWelcomePage();
return;
}
try
{
short port = 0;
//show a loading message
View.ShowLoading();
//call the web service to send the picture
using (IServiceClientProxy proxy = new IServiceClientProxy(binding, new ProtocolVersion11()))
{
SendBarcodeImage sendImageRequest = new SendBarcodeImage();
SendBarcodeImageResponse response = proxy.SendBarcodeImage(sendImageRequest);
port = response.SendBarcodeImageResult;
//send the image
string code = SendImage(port, GHI.Utilities.Bitmaps.ConvertToFile(bitmap));
if (code == null)
{
//the bar code was not recognized
//show the camera page
View.ShowMessageWithButton(CODE_NOT_RECOGNIZED_MSG, () => { View.ShowCamera(); });
return;
}
//get book info
GetBookInformationsResponse bookInfoResponse = proxy.GetBookInformations(new GetBookInformations() { barcode = code });
if (bookInfoResponse.GetBookInformationsResult.ISBN == null)
{
//the book is not in the WS database
View.ShowMessageWithButton(INVALID_BARCODE_MSG, () => { View.ShowCamera(); });
return;
}
LibraryModelSingleton.Instance.Book = bookInfoResponse.GetBookInformationsResult;
if (state == InnerState.BORROWING)
{
//show the book information
View.ShowBooKForLoan();
}
else if (state == InnerState.RETURNING)
{
//call the ws in order to get the loan information
GetLoanState loanStateRequest = new GetLoanState();
loanStateRequest.bookID = bookInfoResponse.GetBookInformationsResult.ID;
loanStateRequest.userID = LibraryModelSingleton.Instance.User.ID;
loanStateRequest.returned = false;
GetLoanStateResponse loanStateResponse = proxy.GetLoanState(loanStateRequest);
if (loanStateResponse.GetLoanStateResult.LoanStateCompositeType.Length == 0)
{
//the book was not borrowed by the user
View.ShowMessageWithButton(INVALID_BARCODE_MSG, () => { View.ShowWelcomePage(); });
}
else
{
//show the book information
LibraryModelSingleton.Instance.StartDate = loanStateResponse.GetLoanStateResult.LoanStateCompositeType[0].LoanStartDate;
LibraryModelSingleton.Instance.DueDate = loanStateResponse.GetLoanStateResult.LoanStateCompositeType[0].LoanExpirationDate;
View.ShowBooKForReturning();
}
}
}
}
catch (Exception)
{ //show a message and then returns in the login page
state = InnerState.INITIAL;
View.ShowMessageWithButton(ERROR_MSG, () => { this.Logout(); });
}
}
public void Login(string id)
{
if (state != InnerState.INITIAL) throw new InvalidOperationException("The user is already logged in!");
IServiceClientProxy proxy = null;
try
{
//using (IServiceClientProxy proxy = new IServiceClientProxy(binding, new ProtocolVersion11()))
//{
proxy = new IServiceClientProxy(binding, new ProtocolVersion11());
//login request to the WS
LogIn loginRequest = new LogIn() { card_number = id };
LogInResponse response = proxy.LogIn(loginRequest);
if (response.LogInResult.FirstName == null)
{
//show a message and return in the login page
Action action = () => { View.ShowLoginPage(); };
View.ShowMessageWithButton(UNREGISTERED_USER_MSG, action);
return;
}
//set the the logged user and show the welcome page
LibraryModelSingleton.Instance.User = response.LogInResult;
state = InnerState.WELCOME;
View.ShowWelcomePage();
//}
}
catch (Exception)
{
//show a message and then returns in the login page
state = InnerState.INITIAL;
View.ShowMessageWithButton(ERROR_MSG, () => { View.ShowLoginPage(); });
}
finally
{
// if (proxy != null) { proxy.Dispose(); }
}
}
