FPC message: Wrong number of parameters specified: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: FPC message: Wrong number of parameters specified
| Old | New | Line | |
|---|---|---|---|
| 1 | + | ## Missing parameter or too many parameters | |
| 2 | + | ||
| 3 | + | You confused the function and forgot a parameter or added a parameter too much. | |
| 4 | + | ||
| 5 | + | ## Missing `@` | |
| 6 | + | ||
| 7 | + | For example: | |
| 8 | + | ||
| 9 | + | ``` pascal | |
| 10 | + | Button1.Click := Button1Click; | |
| 11 | + | ``` | |
| 12 | + | ||
| 13 | + | In [[Mode ObjFPC|{$mode objfpc}]] you must add the [[@|@-address-operator]] to tell the compiler, that you want the pointer to the function, not the result of the function: | |
| 14 | + | ||
| 15 | + | ``` pascal | |
| 16 | + | Button1.Click := @Button1Click; | |
| 17 | + | ``` | |
| 18 | + | ||
| 19 | + | Delphi users often confuse this, because Delphi allows it and adds the @ internally. If you prefer the Delphi syntax you can use [[Mode Delphi|{$mode Delphi}]] instead of `{$mode ObjFPC}`, or use the [[sGlobalModeswitch|mode switch]] `{$modeswitch classicprocvars on}`. | |
| 20 | + | ||
| 21 | + | --- | |
| 22 | + | *From the Free Pascal wiki, page "FPC message: Wrong number of parameters specified", as it stood on 2020-02-16 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).* |