Microsoft KB Archive/58800

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Using _dos_findfirst Function to Retrieve Disk Volume

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Q58800

5.10 6.00 6.00a 6.00ax 7.00 | 1.00 1.50 MS-DOS | WINDOWS kbprg -- The information in this article applies to: - The C Run-time (CRT), included with: - Microsoft C for MS-DOS, versions 5.1, 6.0, 6.0a, and 6.0ax - Microsoft C/C++ for MS-DOS, versions 7.0 - Microsoft Visual C++ for Windows, version 1.0 and 1.5 -- SUMMARY ======= In Microsoft C, using the _dos_findfirst function to find a disk volume with the _A_VOLID attribute gets the disk volume correctly unless the volume name is greater than eight characters. MORE INFORMATION ================ Volume labels are a specific type of directory entry specified by setting bit 3 in the attribute field to 1 or 0x08. They are a special type of file that can only be in the root directory. The maximum number of characters a volume label can have is 11 characters (8 characters for the filename followed by a three-character extension). The C run-time function _dos_findfirst will return the volume label in an 8.3 file format because MS-DOS stores the volume label in the file format. For example, if a disk has a volume label of &quot;A_LONG_NAME&quot;, calling _dos_findfirst with the _A_VOLID attribute will return the volume label as &quot;A_LONG_N.AME&quot;. Additional reference words: kbinf 5.10 6.00 6.00a 6.00ax 7.00 1.00 1.50 KBCategory: kbprg KBSubcategory: CRTIss

Keywords : kb16bitonly

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Technology : kbVCsearch kbAudDeveloper kbCRT