Lite-C confusion

Gamestudio Links

Zorro Links

loading historical data 1st time
by AndrewAMD. 04/14/23 12:54

Trade at bar open
by juanex. 04/13/23 19:43

Bug in Highpass2 filter
by rki. 04/13/23 09:54

Adding Limit Orders For IB
by scatters. 04/11/23 16:16

FisherN
by rki. 04/11/23 08:38

AUM Magazine

Latest Screens

4 registered members (AndrewAMD, fogman, Grant, juanex), 972 guests, and 7 spiders.

Key: Admin, Global Mod, Mod

Newest Members

Print Thread

Rate Thread

Lite-C confusion #244186 01/03/09 04:27 01/03/09 04:27
Joined: Dec 2008 Posts: 43 D DavidM OP Newbie
DavidM OP Newbie D Joined: Dec 2008 Posts: 43	Being a C/C++/Java/D/Python programmer, Lite-C's semantics have me confused at times. Look at the following function: Code: function vec_dump(STRING * name, VECTOR* vec ) { if ( name==NULL ) return; diag_var( "%s", name ); if ( vec==NULL ) diag("NULL"); else { diag_var(" x=%f", vec.x ); diag_var(" y=%f", vec.y ); diag_var(" z=%f\n", vec.z ); } } void main() { VECTOR foo ; vec_set( foo, vector(1,2,3) ); vec_dump( "Show Me", foo ); } The vec_dump function crashes when the passed VECTOR* is accessed. PS. I realize I am passing a stack object(foo) to a pointer function but the manual explains Lite-C converts structs references to struct pointers.

Re: Lite-C confusion [Re: DavidM] #244190 01/03/09 06:55 01/03/09 06:55
Joined: Mar 2002 Posts: 1,774 Magdeburg F FlorianP Serious User
FlorianP Serious User F Joined: Mar 2002 Posts: 1,774 Magdeburg	Well, the problem is not the vector - its the diag_var. I don't really know why it crashs but e.g. diag(name); works. I think diag_var uses c++ structs and cannot convert the gamestudio-strings Last edited by FlorianP; 01/03/09 06:57. I <3 LINQ

Re: Lite-C confusion [Re: FlorianP] #244220 01/03/09 12:46 01/03/09 12:46
Joined: Dec 2008 Posts: 43 D DavidM OP Newbie
DavidM OP Newbie D Joined: Dec 2008 Posts: 43	If I comment out the lines which log the vector x,y,z then the function works. It seems to have a problem with the vector.

Re: Lite-C confusion [Re: DavidM] #244227 01/03/09 13:04 01/03/09 13:04
Joined: Oct 2007 Posts: 5,209 İstanbul, Turkey Quad Senior Expert
Quad Senior Expert Joined: Oct 2007 Posts: 5,209 İstanbul, Turkey	VECTOR* foo = vector(0,0,0); vec_set( foo, vector(1,2,3) ); vec_dump( "Show Me", foo ); 3333333333

Re: Lite-C confusion [Re: Quad] #244231 01/03/09 13:24 01/03/09 13:24
Joined: Dec 2008 Posts: 43 D DavidM OP Newbie
DavidM OP Newbie D Joined: Dec 2008 Posts: 43	Thanks for the post Quad but my question is why my code doesn't work. vector() uses a pool of 64 temporaries so it isn't always appropriate and I want a function which can dump local, global or temporaries.

Re: Lite-C confusion [Re: DavidM] #244247 01/03/09 15:49 01/03/09 15:49
Joined: Sep 2003 Posts: 928 Spirit Moderator
Spirit Moderator Joined: Sep 2003 Posts: 928	This is interesting, it works when I call vec_dump( "Show Me", &foo ); as I would in C++, but lite-C is supposed to save newbies from the '&' stuff, maybe diag_var is an exception? Or it is a bug in lite-C?

Re: Lite-C confusion [Re: Spirit] #244249 01/03/09 16:01 01/03/09 16:01
Joined: Sep 2003 Posts: 928 Spirit Moderator
Spirit Moderator Joined: Sep 2003 Posts: 928	I have to take this back, it now crashes with &foo as well - but now I see the reason: diag_var( "%s", name ); That's the crash. "name" is not a var, its a char* so youre passing a wrong argument type, and "%s" wont work in diag_var anyway I guess. Last edited by Spirit; 01/03/09 16:05.