Microsoft KB Archive/110968

Knowledge Base

INFO: FoxPro Header Check to Determine if Table is Corrupt

Article ID: 110968

Article Last Modified on 2/22/2005

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APPLIES TO

• Microsoft Visual FoxPro 3.0 Standard Edition
• Microsoft FoxPro 2.5b
• Microsoft FoxPro 2.5a
• Microsoft FoxPro 2.5b
• Microsoft FoxPro 2.6 Standard Edition
• Microsoft FoxPro 2.5b for MS-DOS
• Microsoft FoxPro 2.5a
• Microsoft FoxPro 2.5b for MS-DOS
• Microsoft FoxPro 2.6 for MS-DOS
• Microsoft FoxPro 2.5b for Macintosh

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This article was previously published under Q110968

SUMMARY

When opening a database file (.DBF), FoxPro checks the header for the following five conditions that indicate corruption in a table:

1. Is the record length invalid?
   • Record length <= 1
   • Record length > maximum record length
2. Are there no fields?
3. Are there more fields than permitted?
4. Is the number of records < 0?
5. Is the file size invalid?
   • (Start-of-data + the # of records) * rec. length > file size
   NOTE: Start-of-data is where the first byte of the first record begins.

Keywords: kbinfo KB110968

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