On Sun, Dec 7, 2008 at 1:03 PM, arpin <[EMAIL PROTECTED]> wrote:
> I have tried to resolve this crash but I am getting nowhere.
> -----------------------------------------
> f = wx.wxFrame(wx.NULL, -1, "Hello")
>
> gridtable = wx.wxLuaGridTableBase();
> function gridtable:GetNumberCols () return 1 end
> function gridtable:GetNumberRows () return 1 end
> function gridtable:GetValue (row, col) return 99 end
> grid = wx.wxGrid(f, wx.wxID_ANY)
> grid:SetTable(gridtable)
> gridtable:SetView( grid )
>
> f:Show(true)
> ---------------------------------------
>
> The problem is in thje function gridtable:GetValue the return type is wrong it
> should be string instead of a number.
>
> It seems that the GetwxStringType is checking for the argument of a function
> instead of a return value. I really do not understand the code enough to find
> a fix. I work on it for a number of hours and finally gave up.
>
> I hope you can figure this out.
Thanks for the code snippet. It makes duplicating the error much easier.
I fixed a little problem in that if Lua has no stack (not in a Lua
function) that we'd crash hard. This was because wxLua's error
function would try to fill a lua_Debug struct to create a nice error
message, but a call to lua_getinfo(L, lua_Debug) would segfault. The
added check was easy so we don't crash... but none the less the
program still exits since Lua calls it's panic() function if
lua_error() is called without a stack. The reason why Lua doesn't have
a stack is not a fault or problem, it's that the C++ virtual function
is being called from C++ code which runs the Lua code (your GetValue()
function) which returns ok, but when we try to get a string off the
top of the stack, we get a number so we error(). Again, I think this
is fine, in that we have to notify the programmer that they're doing
something wrong. Unfortunately, this is where Lua calls it's panic()
function which calls the C function exit() that abruptly ends the
program.
So, long story short: You now get the message below and the program exits:
PANIC: unprotected error in call to Lua API (wxLua: Expected a
'string' or 'wxString' for parameter -1, but got a 'number'.
Function called: '?'
This is woefully uninformative, in that it doesn't say where it
happened because we can't get any help from Lua. I could write another
set of functions or a flag to the current ones to NOT error, but
rather just print() the error and continue. I have to think about if
it's worth it in that I don't want the bindings to grow until they're
too much for me to handle.
===============
As a side note; you may want to use this form of the virtual functions
so you can get at the 'self'
function gridtable.GetValue (self, row, col) print(self, row, col);
return '99' end
Regards,
John
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