Difference between revisions of "FPC message: Wrong number of parameters specified"

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m
(syntaxhighlight)
Line 8: Line 8:
  
 
For example:
 
For example:
  Button1.Click := Button1Click;
+
<syntaxhighlight>Button1.Click := Button1Click;</syntaxhighlight>
 
    
 
    
 
In mode objfpc you must add the @ to tell the compiler, that you want the pointer to the function, not the result of the function:
 
In mode objfpc you must add the @ to tell the compiler, that you want the pointer to the function, not the result of the function:
  Button1.Click := @Button1Click;
+
<syntaxhighlight>Button1.Click := @Button1Click;</syntaxhighlight>
  
 
Delphi users often confuse this, because Delphi allows it and adds the @ internally. If you prefer the Delphi syntax you can use {$mode Delphi} instead of {$mode ObjFPC}.
 
Delphi users often confuse this, because Delphi allows it and adds the @ internally. If you prefer the Delphi syntax you can use {$mode Delphi} instead of {$mode ObjFPC}.

Revision as of 07:52, 7 May 2012

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Missing parameter or too many parameters

You confused the function and forgot a parameter or added a parameter too much.

Missing @

For example:

Button1.Click := Button1Click;

In mode objfpc you must add the @ to tell the compiler, that you want the pointer to the function, not the result of the function:

Button1.Click := @Button1Click;

Delphi users often confuse this, because Delphi allows it and adds the @ internally. If you prefer the Delphi syntax you can use {$mode Delphi} instead of {$mode ObjFPC}.