[Cbc] Pass model and/or data to the executable via standard input

[John Forrest]

Pietro,

You should be able to read a gmpl file into Cbc (If GMPL installed using 
ThirdParty).  The format is something like

cbc -import gmpl_model_file%gmpl_data_file -solve

The code may be broken if nobody has used the facility for years but 
should be easy to fix.

John Forrest

On 16/04/13 14:22, Pietro Scionti wrote:
>
> Hi,
>
> i am learning CBC in order to transition to it from GLPK.
>
> Since I cannot lose GMPL's capabilities but for various reasons I am 
> constrained to use the unmodified executable, my modus operandi is
>
> 1) run GLPK with the "--wlp model.lp --check" option to make the mod-> 
> lp transition
>
> 2) run cbc solving the .lp model
>
> I would like to know, is there a way to pass the model to be solved 
> via the console standard input? My models (all integer) get pretty big 
> pretty fast, and I am concerned I might use a huge amount of disk 
> space that I then need to clean up, while this could all be avoided if 
> I could feed the model to cbc in memory.
>
> If i was not clear, what I want to accomplish in GLPK can be done like 
> this (language is C#, i am on Windows 7):
>
>             System.Diagnostics.Process process = new 
> System.Diagnostics.Process();
>
> process.StartInfo.UseShellExecute = false;
>
>             process.StartInfo.FileName = glpsolPath;
>
>             process.StartInfo.Arguments = String.Format("--math 
> /dev/stdin --output {0} --log {1}", outputStreamPath, logPath);
>
> process.StartInfo.RedirectStandardInput = true;
>
>             process.Start();
>
>             StreamReader tr = new StreamReader(modelPath);
>
> process.StandardInput.Write(tr.ReadToEnd());
>
> Thanks everyone,
>
> Pietro Scionti
>
>
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