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[Gollum]

Hallo,

folgend ein Ausschnitt aus der Fastreport-Doku. Vielleicht hilfts:

Delphi-Quellcode:

Modifying the variable’s value

There are two ways to modify the value of a variable:

  frxReport1.Variables['My Variable 2'] := 10;

or

var
  Index: Integer;
  Variable: TfrxVariable;

{ search for the variable }
  Index := frxReport1.Variables.IndexOf('My Variable 2');
{ if it is found, change a value }
  if Index <> -1 then
  begin
    Variable := frxReport1.Variables.Items[Index];
    Variable.Value := 10;
  end;

It should be noted, that when accessing a report variable its value is calculated if it is of string type. That means the variable which value is 'Table1."Field1"' will return a value of a DB field, but not the 'Table1."Field1"' string. You should be careful when assigning a string-type values to report variables. For example, the next code will raise exception "unknown variable 'test'" when running a report:
 

frxReport1.Variables['My Variable'] := 'test';
 

because FastReport trying to calculate a value of such variable. The right way to pass a string values is:
 

frxReport1.Variables['My Variable'] := '''' + 'test' + '''';

In this case the variable value - string 'test' will be shown without errors. But keep in mind that:

- string should not contain single quotes. All single quotes must be doubled;

- string should not contain #13#10 symbols.

 
In some cases it is easier to pass variables using a script.