System.SysUtils.EConvertError
Delphi
EConvertError = class(Exception);
C++
class PASCALIMPLEMENTATION EConvertError : public Exception
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| class | public | System.SysUtils.pas System.SysUtils.hpp |
System.SysUtils | System.SysUtils |
Description
EConvertError is the exception class for string and object conversion errors.
EConvertError is raised when:
- An application makes an unsuccessful attempt to convert an integer, float, date, or time to a string, or to convert a string to one of these other types.
- An application passes an invalid argument to a formatting routine.
- An application attempts to assign one type of component derived from TPersistent to another component derived from TPersistent when such an assignment is not possible. For example, EConvertError is raised by the attempted assignment of a TButton control to a TEdit control.
In the examples below, an EConvertError exception is raised on the attempt to convert a String to a TDateTime and the date in the String is invalid. The type of exception and the error message are displayed.
//Delphi example
const
LF = #10;
var
TempDate: TDateTime;
begin
try
TempDate := StrToDateTime('99/99/1998');
except
on E: EConvertError do
ShowMessage(E.ClassName + LF + E.Message);
end;
end;
//C++ example
TDateTime TempDate;
try
{
TempDate = StrToDateTime("99/99/1998");
}
catch (EConvertError &E)
{
ShowMessage(AnsiString(E.ClassName()) + "\n" + AnsiString(E.Message));
}
See Also
Code Examples