CODEWITHSUNDEEP
delphi
yannis_kal
yannis_kal

Reputation: 55

Undeclared identifier 'ShowMessage' in Delphi 10

Ι am encountering an error in this code:

Result := TempStr;
ShowMessage('test');

Undeclared identifier 'ShowMessage'

Any ideas what I am doing wrong?

Upvotes: 1

Views: 2316

Answers (1)

Andreas Rejbrand
Andreas Rejbrand

Reputation: 108963

If you look at the documentation, you'll see that the ShowMessage function is found in the Dialogs unit.

Therefore, to use the ShowMessage function in a program or unit, you need to make sure to include the Dialogs unit in an appropriate uses clause.

The Dialogs unit is by default included in GUI forms (both VCL and FMX), so most likely you are creating a new, non-form unit in a GUI application or developing a console application. In either case, you must add the unit yourself.

Here is a console example:

program Error;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  SysUtils;

begin
  ShowMessage('Test');
end.

becomes

program Solution;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  SysUtils, Dialogs;

begin
  ShowMessage('Test');
end.

Upvotes: 7

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