Microsoft KB Archive/105043

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Maximum Number of Bytes Read Using Low-Level Functions

Article ID: 105043

Article Last Modified on 12/3/2003


  • Microsoft Visual FoxPro 3.0 Standard Edition
  • Microsoft FoxPro 2.0
  • Microsoft FoxPro 2.5b for MS-DOS
  • Microsoft FoxPro 2.5a
  • Microsoft FoxPro 2.5b
  • Microsoft FoxPro 2.5a

This article was previously published under Q105043


When you are using FoxPro low-level functions to read a file, the maximum number of bytes that can be read in is 65,535. If this number is exceeded, error message #11 "Invalid function argument value, type or count" will be generated.


The number of bytes read is for a single command only, which means a file of greater size can be read but the number of bytes read at one time can not exceed 65,535. This can be demonstrated with the following example. After the error message is generated, the user may choose Ignore to continue with the program execution.

   ? FREAD(mchan,65536)
   *error message number 11 generated
   ? FGETS(mchan,65536)
   *error message number 11 generated
   ? FREAD(mchan,65535)
   * or
   ? FGETS(mchan,65535)
   * no error is generated
   ? FCLOSE(mchan)

Additional query words: VFoxWin FoxDos FoxWin errmsg err msg

Keywords: kberrmsg KB105043