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Author
Topic: Identifier not found (Read 653 times)
jan741
New Member
Posts: 15
Identifier not found
«
on:
December 09, 2022, 05:16:53 pm »
Identifier deproc not found on function-call(see comment in code below). Exactly based on this example.
https://wiki.lazarus.freepascal.org/Asynchronous_Calls
What's going wrong?
Code: Pascal
[Select]
[+]
[-]
unit
Unit1
;
{$mode objfpc}{$H+}
interface
uses
Classes
,
SysUtils
,
Forms
,
Controls
,
Graphics
,
Dialogs
,
StdCtrls
,
dbugintf
,
LazLoggerBase
,
pingsend
;
const
threadcount
=
100
;
stringlen
=
10000
;
type
{ TForm1 }
TForm1
=
class
(
TForm
)
Button1
:
TButton
;
Button2
:
TButton
;
procedure
Button1Click
(
Sender
:
TObject
)
;
procedure
Button2Click
(
Sender
:
TObject
)
;
private
{ private declarations }
procedure
deproc
(
input
:
PtrInt
)
;
public
{ public declarations }
end
;
myrec
=
record
i
:
longint
;
s
:
string
;
end
;
Pmyrec
=
^
myrec
;
var
Form1
:
TForm1
;
finished
:
longint
;
y
:
longint
;
nr
:
integer
;
threadvar
thri
:
ptrint
;
implementation
{$R *.lfm}
{ TForm1 }
function
f
(
p
:
Pointer
)
:
ptrint
;
var
s
:
ansistring
;
thisrec
:
myrec
;
begin
thisrec
:
=
Pmyrec
(
p
)
^
;
Writeln
(
'thread '
,
longint
(
thisrec
.
i
)
,
' started'
)
;
thri
:
=
0
;
while
(
thri<stringlen
)
do
begin
s
:
=
s
+
'1'
;
inc
(
thri
)
;
end
;
Writeln
(
'thread '
,
thisrec
.
i
,
' finished with'
,
thisrec
.
s
)
;
InterLockedIncrement
(
finished
)
;
f
:
=
0
;
nr
:
=
10
;
Application
.
QueueAsyncCall
(
@
deproc
,
nr
)
;
//<--------------------------------------------------------------------------------------- error happening here
end
;
procedure
TForm1
.
Button1Click
(
Sender
:
TObject
)
;
begin
y
:
=
1
;
end
;
procedure
TForm1
.
Button2Click
(
Sender
:
TObject
)
;
var
r
:
array
[
1
..
threadcount
]
of
myrec
;
pr
:
^
myrec
;
x
:
longint
;
begin
finished
:
=
0
;
for
x
:
=
1
to
threadcount
do
begin
r
[
x
]
.
s
:
=
' test '
;
r
[
x
]
.
i
:
=
x
;
BeginThread
(
@
f
,
@
r
[
x
]
)
;
writeln
(
'ready for next'
)
;
end
;
while
finished<threadcount
do
;
end
;
procedure
deproc
(
input
:
PtrInt
)
;
begin
writeln
(
'async called.'
)
;
end
;
end
.
«
Last Edit: December 09, 2022, 05:21:20 pm by jan741
»
Logged
Handoko
Hero Member
Posts: 5158
My goal: build my own game engine using Lazarus
Re: Identifier not found
«
Reply #1 on:
December 09, 2022, 05:51:50 pm »
That
line #97
, should be:
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
deproc
(
input
:
PtrInt
)
;
Logged
howardpc
Hero Member
Posts: 4144
Re: Identifier not found
«
Reply #2 on:
December 09, 2022, 05:53:15 pm »
Try this adaptation:
Code: Pascal
[Select]
[+]
[-]
unit
Unit1
;
{$mode objfpc}{$H+}
{$IFDEF MSWINDOWS} {$apptype console} {$EndIf}
interface
uses
Classes
,
SysUtils
,
Forms
,
Controls
,
Graphics
,
Dialogs
,
StdCtrls
;
const
threadcount
=
100
;
stringlen
=
10000
;
type
TForm1
=
class
(
TForm
)
Button2
:
TButton
;
procedure
Button2Click
(
Sender
:
TObject
)
;
private
procedure
deproc
(
input
:
PtrInt
)
;
end
;
myrec
=
record
i
:
longint
;
s
:
string
;
end
;
Pmyrec
=
^
myrec
;
var
Form1
:
TForm1
;
finished
,
nr
:
LongInt
;
threadvar
thri
:
PtrInt
;
implementation
{$R *.lfm}
function
f
(
p
:
Pointer
)
:
PtrInt
;
var
s
:
AnsiString
=
''
;
thisrec
:
myrec
;
begin
thisrec
:
=
Pmyrec
(
p
)
^
;
Writeln
(
'thread '
,
thisrec
.
i
,
' started'
)
;
thri
:
=
0
;
while
(
thri<stringlen
)
do
begin
s
:
=
s
+
'1'
;
Inc
(
thri
)
;
end
;
Writeln
(
'thread '
,
thisrec
.
i
,
' finished with'
,
thisrec
.
s
)
;
InterLockedIncrement
(
finished
)
;
f
:
=
0
;
nr
:
=
10
;
Application
.
QueueAsyncCall
(
@
Form1
.
deproc
,
nr
)
;
// <--------------- error happening here
end
;
procedure
TForm1
.
Button2Click
(
Sender
:
TObject
)
;
var
r
:
array
[
1
..
threadcount
]
of
myrec
;
pr
:
^
myrec
;
x
:
longint
;
begin
finished
:
=
0
;
for
x
:
=
1
to
threadcount
do
begin
r
[
x
]
.
s
:
=
' test '
;
r
[
x
]
.
i
:
=
x
;
BeginThread
(
@
f
,
@
r
[
x
]
)
;
writeln
(
'ready for next'
)
;
end
;
while
finished<threadcount
do
;
end
;
procedure
TForm1
.
deproc
(
input
:
PtrInt
)
;
begin
WriteLn
(
'async called.'
)
;
end
;
end
.
«
Last Edit: December 09, 2022, 06:44:41 pm by howardpc
»
Logged
Thaddy
Hero Member
Posts: 14392
Sensorship about opinions does not belong here.
Re: Identifier not found
«
Reply #3 on:
December 09, 2022, 06:16:22 pm »
The error may be here:
longint
(thisrec.i). That should be
ptrUint
not ptrInt. Pointers can not be negative and longint does not work above 32 bit.
«
Last Edit: December 09, 2022, 06:18:04 pm by Thaddy
»
Logged
Object Pascal programmers should get rid of their "component fetish" especially with the non-visuals.
howardpc
Hero Member
Posts: 4144
Re: Identifier not found
«
Reply #4 on:
December 09, 2022, 06:46:12 pm »
@Thaddy
Actually the Longint() cast is not needed at all, since the record field is already a longint.
He is not casting a pointer at that point in the code.
I've changed my example accordingly.
Logged
jan741
New Member
Posts: 15
Re: Identifier not found
«
Reply #5 on:
December 10, 2022, 12:00:04 am »
It works now. Thanks.
Logged
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