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   ► KBTo/From GuidesCorel ParadoxStatements  Print This    All Groups  

Corel Paradox Statements

Exception Trapping

Languages Focus

A common usage of exception handling is to obtain and use resources in a "try-it" block, deal with any exceptions in an "exceptions" block, and release the resources in some kind of "final" block which executes whether or not any exceptions are trapped.

Corel Paradox:   try...onFail

ObjectPAL has a try...onFail statement but does not have a finally-type component. However, the code afer endTry will execute.

try
onFail
endTry
Syntax Example:
var
i SmallInt
endVar
try
i = 0
i = 1/i
onFail
msgInfo("", "You cannot divide by zero.")
endTry




Cross Reference Examples:

ASP Classic:   On Error
Syntax Example:
On Error Resume Next
Response.Write FormatDateTime(f_CurrentActualDate, vbShortDate)
  
  If ErrNumber <> 0 Then
Break(f_CurrentActualDate)
End If
On Error Goto 0
C#:   try...catch...finally

C# uses a try...catch...finally statement to trap for errors.

try {}
catch {}
finally {}
Syntax Example:
try
{
int y = 0;
y = 1 / y;
}
catch
{
MessageBox.Show("you cannot divide by zero");
}
C++:   try/catch
Syntax Example:
try {
  //Some code.
}
catch(AnError) {
  //Error code here.
}
Delphi:   try..except, try..finally

Use a try..except..end block to trap and process errors.

Delphi also offers a try...finally where code will execute in the finally section no matter what. It's common to put a try..except inside a try..finally.

Syntax Example:
var
y : Double;
begin
try
y := 0;
y := (1/y);
ShowMessage(FloatToStr(y));
except
ShowMessage('You cannot divide by zero.');
end;
end;
Delphi Prism:   try..except, try..finally

Use a try..except..end block to trap and process errors.

Delphi also offers a try...finally where code will execute in the finally section no matter what. It's common to put a try..except inside a try..finally.

Syntax Example:
try
  var y: Integer;
  y := 0;
  y := 1/y;
except
  MessageBox.Show("You cannot divide by zero.");
end;
Java:   try/catch/finally
Syntax Example:
try {
  /* Risky code here. */
}
catch (SomeException) {        //one or more.
  /* Recovery here. */
}
finally {                      //0 or one.
  /* Do something. */
}
JavaScript:   try/catch/finally

See "throw" to raise (throw) an error.

Syntax Example:
try {
  //Do something.
}
catch(e) {        //one or more.
  //Do something.
}
finally {         //0 or one.
  //Do something.
}
VB.Net:   Try...Catch...Finally

VB.Net uses a try...catch...finally statement to trap for errors.

Try
Catch
Finally
End Try
Syntax Example:
Try
Dim y As Integer = 0
y = 1 / y
Catch
MessageBox.Show("you cannot divide by zero")

End Try




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