DboTclHelper_sCloseCFile returns "RuntimeError..."

Hi Sir,

    I tried to use DboPage_CopyToFile and DboPage_CopyFromFile, and those two procedure need CFile* argument. There are two functions in DboTclHelper about CFile: DboTclHelper_sGetCFile and DboTclHelper_sCloseCFile.  But i can not get any information about how to set FileMode (in sGetCFile), and after called CopyFromFile and then sCloseFile, it will return a Error: "RuntimeError unknown exception", this error will cause Capture crash.

My Question:

1. How to set the FileMode argument (read/write/append/.... )?

2. How to close CFile* gracefully?

     Any document about those functions will be appreciated.

     Thank you.

Daniel