If you tell me how I will do it.

I am trying.

I compiled with fpc 1.0.10

I hope the next is the stack back trace: (bt)

#0 $006ccc43 in PCHAR_TO_ANSISTR (A=$0, P=$a918) at astrings.inc:266 #1 $0068d3bd in PROPENUMPROC (WINDOW=656794, STR=$a918, DATA=-1) at win32callback.inc:66
#2 $77d398a1 in USER32!EnumDesktopWindows () from /cygdrive/c/WINDOWS/system32/user32.dll
#3 $77d398df in USER32!EnumPropsA () from
/cygdrive/c/WINDOWS/system32/user32.dll
#4 $77d37ad7 in USER32!SetWindowPlacement () from /cygdrive/c/WINDOWS/system32/user32.dll
#5 $77d3ccd4 in USER32!DefRawInputProc () from
/cygdrive/c/WINDOWS/system32/user32.dll
#6 $77d145bd in USER32!TranslateMessageEx () from /cygdrive/c/WINDOWS/system32/user32.dll
#7 $77d147d4 in USER32!DefWindowProcA () from
/cygdrive/c/WINDOWS/system32/user32.dll
#8 $77f65da3 in ntdll!LdrDestroyOutOfProcessImage () from ntdll.dll #9 $00653620 in CNSENDMESSAGE (LM_MESSAGE=1026, SENDER=$36a56f4, DATA=$0) at controls.pp:1266
#10 $00659894 in TWINCONTROL__DESTROYCOMPONENT (this=$36a56f4) at wincontrol.inc:2640
#11 $00659aa9 in TWINCONTROL__DESTROYWND (this=$36a56f4) at wincontrol.inc:2704
#12 $0065731d in TWINCONTROL__DESTROYHANDLE (this=$36a56f4) at wincontrol.inc:1546
#13 $00657304 in TWINCONTROL__DESTROYHANDLE (this=$36a3e64) at wincontrol.inc:1543
#14 $0065867f in TWINCONTROL__DESTROY (this=$36a3e64) at wincontrol.inc:2169 #15 $0064a04c in TSCROLLINGWINCONTROL__DESTROY (this=$36a3e64) at scrollingwincontrol.inc:163
#16 $0064a2f0 in TCUSTOMFORM__DESTROY (this=$36a3e64) at customform.inc:119 #17 $0066366e in TPROMPTDIALOG__DESTROY (this=$36a3e64) at promptdialog.inc:209
#18 $006ce7a6 in TOBJECT__FREE (this=$36a3e64) at objpas.inc:56 #19 $00663d1b in SHOWPROMPTDIALOG (DIALOGCAPTION=$6e92c9, DIALOGMESSAGE=$6e9203, DIALOGTYPE=256, BUTTONS=$366ef34, BUTTONCOUNT=1, DEFAULTINDEX=0, ESCAPERESULT=9, USEDEFAULTPOS=true, X=0, Y=0) at promptdialog.inc:370
#20 $006c5977 in TINTERFACEBASE__PROMPTUSER (DIALOGCAPTION=$6e92c9, DIALOGMESSAGE=$6e9203, DIALOGTYPE=256, BUTTONS=$366ef34, BUTTONCOUNT=1, DEFAULTINDEX=0, ESCAPERESULT=9, this=$89f008) at interfacebase.inc:1286 #21 $0067520e in PROMPTUSER (DIALOGCAPTION=$6e92c9, DIALOGMESSAGE=$6e9203, DIALOGTYPE=256, BUTTONS=$366ef34, BUTTONCOUNT=1, DEFAULTINDEX=0, ESCAPERESULT=9) at winapi.inc:896
#22 $00662a22 in MESSAGEDLG (ACAPTION=$6e92c9, AMSG=$6e9203, DLGTYPE=MTWARNING, BUTTONS=[MBIGNORE], HELPCTX=0) at messagedialogs.inc:164 #23 $0040da57 in SETUPFPCSOURCEDIRECTORY (INTERACTIVESETUP=true) at initialsetupdlgs.pas:107
#24 $00614536 in TMAINIDE__LOADGLOBALOPTIONS (this=$36a2f64) at main.pp:790 #25 $006146fb in TMAINIDE__CREATE (THEOWNER=$89ef38, this=$36a2f64) at main.pp:826
#26 $0064edcb in TAPPLICATION__CREATEFORM (INSTANCECLASS=$7d0834, REFERENCE=void, this=$89ef38) at application.inc:1101 #27 $006d40dc in main () at lazarus.pp:74

If I try to close the dialog window with the [x] (close button), it crashes sooner.

Horacio

Okay, now we getting there. Now when you start gdb type:
- 'file lazarus.exe' (you did that, i guess)
- 'b win32callback.inc:66'
- 'run'
- when it stops on win32callback.inc:66, step into the PCHAR_TO_ANSISTR function with 's', then print some variables 'print a', and 'x/s p', which dumps the string at location p.

HTH,

Micha.

Hmm it seems p does not point to a valid string after, maybe it's some windows atom. In that case, I think you need to comment the assert code (the line 66 in win32callback.inc) and try again. It seems parameter Str is expected to be a string, but apparantly this is not the case.

What do other people think?

Regards,

Micha.

Have you compiled with debugging on?

'make DEBUG=1 OPT=-g all' or something alike? Otherwise it's fairly logical you don't see the bug because the code isn't there, no assertions.

Regards,

Micha.

Micha Nelissen wrote

What do other people think?

Are the snapshots being updated?
I don't see these problems with CVS version (Until 23/08).

karl

Ok,

What i found:

in astrings.inc - procedure PChar_To_AnsiStr - line 266:

print a -> $8 = (PCHAR) $0

print p -> $6 = (PCHAR) $a918

x/s p -> $a918: <Address $a918 out of bounds>

print p[0] -> Error: Cannot access memory at address $a918

any hint?

Horacio

Can you see _why_ it crashes? Nil-pointer dereference etc? Can you start in gdb and give a stack trace? What compiler version are you using?

Regards,

Micha.

Hi,
�
I downloaded today snapshot and compiled ok on
win32.
As always until today, I can't start Lazarus
properly.
�
The splash screen is properly shown, then the FPC
Sources Directory not found dialog appears, and when I press Ignore, Lazarus crashes.
I followed the error, and it is raised
on:
Line 2169 of wincontrol.inc ->
DestroyHandle;
�
It is called from the Inherited clause on the
Dialog free.
�
Horacio Jamilis