Permissions issue when writing lp file from mosel

Are you configuring any restrictions for the Mosel model execution? Otherwise the access rights will depend on the user who is running the process.

Would you mind sharing some further detail, in particular the statement that you are using for writing out the matrix file?

Hi Susan,

This is the statement

exportprob(0, TemplpFile, TotalRevenue)

TemplpFile is the path to the file. The folder part is picked up in C# as the user's default temporary folder and has a file name appended to it. The main application executable has no problems writing to the temp folder but the bim file does.

Many thanks,

Stewart

Before trying to write out the file this way, could you try to run some experiments by adding a few lines into your Mosel source:

1. Check whether the destination directory exists and is writeable (requires: uses "mmsystem"):

 writeln(TemplpFile)

tdir:= pathsplit(SYS_DIR,TemplpFile)

 writeln(tdir)

 fstat:=getfstat(tdir)

 if bittest(fstat, SYS_TYP)<>SYS_DIR

   then writeln("tdir is not a directory")

 end-if

 if bittest(fstat, SYS_WRITE)<>SYS_WRITE

   then writeln("tdir is not writeable")

 end-if

2.Check whether Mosel's temporary directory can be used for writing the file:

 tdir:=gettmpdir

 writeln(tdir)

exportprob(0, string(tdir))

Mosel uses the user's temporary directory as its temporary directory, so you should be seeing some similar output from the second as what you get in the first case.

Thanks Susan,

Having asked the customer's IT Group to investigate further this seems to be general permissions problem. Another (non-Mosel) operation that involves a temporary file, and which I'd been informed was working, was in fact failing due to the same issue. I wasn't aware of the mmsystem features in the code above, they will prove useful!