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Re: [Help-glpk] VBA/dll for Excel
From: |
Andrew Makhorin |
Subject: |
Re: [Help-glpk] VBA/dll for Excel |
Date: |
Tue, 18 Mar 2008 20:23:09 +0300 |
> I produced a DLL as well by adding __stdcall __export to the right
> function calls. [BTW, I'm using the free Turbo C++ compiler from
> Borland.]
> BUT, I cannot seem to get the callback function for "glp_term_hook" to
> properly work. Before I begin to setup the problem, I use very similar
> VBA code to what the Version 10 of the Informatiks software uses:
> Const MAXMSG as long = 500
> Private ActMsg as long
> Private Messages(MAXMSG) as string
> Public sub INIT_GLPK()
> Dim info as long
> info = 0
> glp_term_hook AddressOf MessageHandler, info
> ActMsg = 0
> end sub
> and
> public function MessageHandler(ByVal info As Long, ByVal msg As Long)
> As Long
> Dim l As Long
> Dim Err_Message As String
> On Error Resume Next
> If ActMsg < MAXMSG Then
> ActMsg = ActMsg + 1
> End If
> l = lstrlen(msg)
> Err_Message = Space$(l + 1)
> lstrcpy Err_Message, msg
> Err_Message = Left(Err_Message, l)
> Messages(ActMsg) = Err_Message
> MessageHandler = 1
> End Function
> However, when the "xputs" function in GLPK tries to return, the code
> bombs. The "xputs" does call the "MessageHandler", and it seems to pass
> in the correct string, and xputs does see the correct return. I believe
> that somehow the stack gets messed up a bit, but I haven't figured out
> any workaround.
> Any ideas on how to successfully invoke the call-back function for the
> terminal hook?
In glpk 4.27 all terminal output goes thru the internal routine
xputc (see file glplib05.c), which outputs a single character; so
may be it would be easier simply replace it by your own routine?
- [Help-glpk] VBA/dll for Excel, Meketon, Marc, 2008/03/17
- Re: [Help-glpk] VBA/dll for Excel, Xypron, 2008/03/18
- RE: [Help-glpk] VBA/dll for Excel, Meketon, Marc, 2008/03/18
- Re: [Help-glpk] VBA/dll for Excel,
Andrew Makhorin <=
- Re: RE: [Help-glpk] VBA/dll for Excel, glpk xypron, 2008/03/18
- [Help-glpk] Hook needed in xfault(), glpk xypron, 2008/03/18
- Re: [Help-glpk] Hook needed in xfault(), Andrew Makhorin, 2008/03/19
- Re: [Help-glpk] Hook needed in xfault(), glpk xypron, 2008/03/19
- Re: [Help-glpk] Hook needed in xfault(), Andrew Makhorin, 2008/03/19
- Re: [Help-glpk] Hook needed in xfault(), glpk xypron, 2008/03/19
- Re: [Help-glpk] Hook needed in xfault(), Andrew Makhorin, 2008/03/19
RE: [Help-glpk] VBA/dll for Excel, Meketon, Marc, 2008/03/18