Difference between revisions of "FPC message: Wrong number of parameters specified"
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For example: | For example: | ||
| − | <syntaxhighlight>Button1.Click := Button1Click;</syntaxhighlight> | + | |
| + | <syntaxhighlight lang=pascal>Button1.Click := Button1Click;</syntaxhighlight> | ||
In [[Mode ObjFPC|<code>{$mode objfpc}</code>]] you must add the [[@|<code>@</code>-address-operator]] to tell the compiler, that you want the pointer to the function, not the result of the function: | In [[Mode ObjFPC|<code>{$mode objfpc}</code>]] you must add the [[@|<code>@</code>-address-operator]] to tell the compiler, that you want the pointer to the function, not the result of the function: | ||
| − | <syntaxhighlight>Button1.Click := @Button1Click;</syntaxhighlight> | + | |
| + | <syntaxhighlight lang=pascal>Button1.Click := @Button1Click;</syntaxhighlight> | ||
Delphi users often confuse this, because Delphi allows it and adds the @ internally. | Delphi users often confuse this, because Delphi allows it and adds the @ internally. | ||
If you prefer the Delphi syntax you can use [[Mode Delphi|<code>{$mode Delphi}</code>]] instead of <code>{$mode ObjFPC}</code>, or use the [[sGlobalModeswitch|mode switch]] <code>{$modeswitch classicprocvars on}</code>. | If you prefer the Delphi syntax you can use [[Mode Delphi|<code>{$mode Delphi}</code>]] instead of <code>{$mode ObjFPC}</code>, or use the [[sGlobalModeswitch|mode switch]] <code>{$modeswitch classicprocvars on}</code>. | ||
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Latest revision as of 03:06, 16 February 2020
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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 {$mode objfpc} you must add the @-address-operator to tell the compiler, that you want the pointer to the function, not the result of the function:
Button1.Click := @Button1Click;
Delphi users often confuse this, because Delphi allows it and adds the @ internally.
If you prefer the Delphi syntax you can use {$mode Delphi} instead of {$mode ObjFPC}, or use the mode switch {$modeswitch classicprocvars on}.
