Using OpenFile() with Sharing and Inheritance Bits

The information in this article applies to:

• Microsoft Windows Software Development Kit (SDK) for Windows versions 3.1 and 3.0

SUMMARY

The following information describes the file-access, file-sharing, and inheritance codes used with MS-DOS Interrupt 21h Function 3Dh that are compatible with the Windows OpenFile() API.

A call to the OpenFile() API that specifies OF_CREATE as the value for the wStyle parameter is translated into a call to the MS-DOS Create File with Handle function (Interrupt 21h Function 3Ch). Because Windows does not pass any style bits (other than OF_CREATE) to MS-DOS, the file is always created with normal attributes.

A call to the OpenFile() API that does not specify OF_CREATE is translated into a call to the MS-DOS Open File with Handle function (Interrupt 21h Function 3Dh). Windows places the value of the low- order byte of the wStyle parameter into the AL register to specify file-access and file- sharing codes.

NOTE: The sharing bits take effect only if the MS-DOS SHARE utility is running on a system.