Delphi Error Message Dialog
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Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community jqgrid error message dialog of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Create error messages Delphi 7 up vote 3 down vote favorite Ok, I am currently a Grade
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11 student thats taking IT. I am trying to finish a Practical assignment but I ran into a bit of a problem, the textbook I am using didn't show me how to Create an error message if the user did not enter data into a RichEdit. Could anyone advise me on how to do this? thank you for taking the time to help. delphi windows-7 error-handling share|improve this question asked Oct messagedialog delphi 8 '13 at 15:56 DNgentle 314 1 E.g. this way if RichEdit1.Text = '' then MessageDlg('The field cannot be empty!', mtError, [mbOK], 0) in an event which will do the validation (usually OnExit event). –TLama Oct 8 '13 at 15:59 Thanks! that was fast... trying it now. –DNgentle Oct 8 '13 at 16:02 1 @DNgentle One advice would be to be proactive, Use your resources available to you before putting your guns down :-) . –Suraj Singh Oct 8 '13 at 16:18 1 What did your instructor say when you asked in class? –Rob Kennedy Oct 8 '13 at 17:05 @RobKennedy Indeed the instructor may know exactly where to look in your textbook –Jerry Dodge Oct 8 '13 at 17:08 | show 1 more comment 1 Answer 1 active oldest votes up vote 4 down vote This is how you raise a generic exception (using the SysUtils.Exception class): raise Exception.Create('Error Message'); An unhandled exception causes the execution path to escape into a default exception handler inside of the Delphi RTL, which will then display the value of the Exception.Message to the user. You could even handle your own exception like this: try ... raise Exception.Create('Error Message'); ... except on E: Exception do begin ShowMessage(E.Message); end; end
This example shows to you about how to use the function MessageDlg for making a Confirmation Dialog. There are two
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techniques that can be used: If the condition is not complicated,
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you can use if ... then. If you have a complicated purpose, you can use case ... of delphi inputbox instead. Screenshot Message Dialog - Confirmation Message Dialog - OK Message Dialog - Cancel Technique To make more effective in writing source code you have, please use one of http://stackoverflow.com/questions/19252589/create-error-messages-delphi-7 technique below. Technique 1: Using Case ... Of By using this technique, your Message Dialog more interactive with simple way. unit Unit1; interface uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, // Automatically added by IDE Vcl.StdCtrls; type TForm1 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public http://docwiki.embarcadero.com/CodeExamples/Berlin/en/MessageDlgConfirmation_(Delphi) declarations } end; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.Button1Click(Sender: TObject); begin case MessageDlg('Are you ready to learn Delphi in LUCCA?', mtConfirmation, [mbOK, mbCancel], 0) of mrOk: begin // Write code here for pressing button OK ShowMessage('Thank you. Please visit us soon.'); end; mrCancel: begin // Write code here for pressing button Cancel ShowMessage('Don''t hesitate to contact us when you need more information.'); end; end; end; end. Technique 2: Using If ... Then This technique can be implemented for simple use. MessageDlg (Delphi) Notes If you are using Delphi XE2, you have to use library Vcl.Dialogs or Dialogs in Interface or Implementation section. And for previous version, such as: Delphi XE, Delphi 2010, Delphi 2009, etc.., use library Dialogs. Normally, if you add a new VCL Form or VCL Frame to your project or just create it, library Dialogs already available. But, if you add a new Data Module or Unit, you have to add library Dialogs manually. Uses Vcl.Dialogs.MessageDlg ( fr | de | ja ) See
for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for https://www.experts-exchange.com/questions/21431056/Delphi-Error-Dialog-Boxes.html a Full Time Job Ways to Get Help Expand Search Submit Close Search Login Join Today Products BackProducts Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange > Questions http://wiki.freepascal.org/Dialog_Examples > Delphi Error Dialog Boxes Want to Advertise Here? Solved Delphi Error Dialog Boxes Posted on 2005-05-20 Delphi 1 Verified Solution 12 Comments 1,453 Views Last Modified: 2009-07-29 My application has exception error message handling....which works fine: in that the errors are captured and handled. However on detection of an exception, the application still generates a dialog box displaying the error message. Can Delphi (version 7) generate these error dialog boxes automatically?....(I have searched, and found none of my previous - design time - "ShowMessage(E.Message)" code). 0 Question by:VEEPROG Facebook Twitter LinkedIn Google Best Solution byCetusMOD PAQed with error message dialog points refunded (100) CetusMOD Community Support Moderator Go to Solution 11 Comments LVL 27 Overall: Level 27 Delphi 26 Message Expert Comment by:kretzschmar2005-05-20 if you run the app within the delphi-ide, the ide catches exceptions before your internal exceptionhandler and shows an errorbox you can disable this (not in mind where yet) meikl ;-) 0 LVL 11 Overall: Level 11 Delphi 9 Message Expert Comment by:pcsentinel2005-05-20 What error message is being displayed. The error may be occuring in a component/class and the code in there might be displaying the dialog box rather than promoting the error. 0 Message Author Comment by:VEEPROG2005-05-20 It is a floating point error. The app is run from the exe (not in IDE) 0 LVL 11 Overall: Level 11 Delphi 9 Message Expert Comment by:pcsentinel2005-05-20 Are you handling Application.Exception which covers any exceptions not caught specifically in the code? if not then FP error might be in a part of your code that is not handling exceptions. Run the app under the IDE and try and trace where the exception is occuring. As I said the error may be occuring in a component/clas
slovenĨina(sk) │ Contents 1 Some useful dialogs 1.1 Message Dialogs 1.1.1 ShowMessage 1.1.2 MessageBox 1.1.3 MessageDLG 1.1.4 QuestionDlg 1.2 Text input Dialogs 1.2.1 InputBox 1.2.2 InputQuery 1.2.3 PasswordBox 1.3 Constants and Types used in message dialogs Some useful dialogs Here are some useful dialogs not found in the Component Palette: procedure ShowMessage (const Msg: string); function MessageBox (Text, Caption: PChar; Flags: Word): Integer; function MessageDlg (const Msg: string; AType: TMsgDlgType; AButtons: TMsgDlgButtons; HelpCtx: LongInt): Word; function InputBox (const ACaption, APrompt, ADefault: string); string; function InputQuery (const ACaption, APrompt: string; var Value: string): Boolean; function PasswordBox(const ACaption, APrompt: String): String; Each of these components causes a small popup box to be displayed, which contains some information and requires a user response: either a button press or some text entry or both. The programmer has little control over the format, size or position of these popup boxes, but can influence their textual content. The reason why there are often several very similar alternatives, is to allow different methods of calling the component and receiving data back from the procedure or function. These dialogs might be platform dependent i.e. they might be displayed differently. For example, strings which are fully displayed in Windows XP, might be truncated in Windows 7. Message Dialogs Message dialogs display a message and wait for a key-press or mouse-click response. ShowMessage procedure ShowMessage(const Msg: string); { Defined in Dialogs.pp } The simplest message dialog: takes a simple string as parameter, displays it in a stereotyped box, and waits for a mouse-click or enter-key event before returning to the calling routine or program. This is a modal procedure call, that is the box is displayed, recei