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[[database drivers.htm|Database Drivers]]

[[choosing the right database driver.htm|Choosing the Right Database Driver]]

[[common database driver features.htm|Common Database Driver Features]]

[[driver strings.htm|Driver Strings]]

[[dos database driver.htm#apu 2gm|DOS:Specifications]]

[[dos database driver.htm#ame43qt|DOS:Data Types]]

[[dos supported commands and attributes.htm|DOS:Supported Commands and Attributes]]

[[dos driver strings.htm|DOS:Driver Strings]]

**DOS:Specifications**

The DOS file driver reads and writes any binary, byte-addressable files. Neither fields nor records are delimited. When reading a record, the driver reads the number of bytes defined in the file's RECORD structure, unless a length parameter is specified in the GET statement.

The DOS driver supports the length parameter for the ADD, APPEND, GET, and PUT statements; this allows for variable length records in a DOS file.

The POINTER function returns the relative byte position within the file of the beginning of the last record accessed by an ADD, APPEND, GET, or NEXT statement.

This file driver performs forward sequential processing //only//. No key or transaction processing functions are supported, and the PREVIOUS statement is not supported.

{{tipbox.jpg|TipBox.jpg}}

**Due to its limitations, the main function of this driver is as a disk editor for binary files.**

| **Files:** | **ClaDOSXL.LIB** | Windows Static Link Library |
|  | **ClaDOSX.LIB** | Windows Export Library |
|  | **ClaDOSX.DLL** | Windows Dynamic Link Library (32-bit) |

**DOS:Data Types**

| **BYTE** | **DECIMAL** |
| **SHORT** | **PDECIMAL** |
| **USHORT** | **STRING** |
| **LONG** | **CSTRING** |
| **ULONG** | **PSTRING** |
| **SREAL** | **DATE** |
| **REAL** | **TIME** |
| **BFLOAT4** | **GROUP** |
| **BFLOAT8** |  |

**DOS:File Specifications/Maximums**

**File Size:            4,294,967,295**

**Records per File:     4,294,967,295**

**Record Size:          64K**

**Field Size:           64K**

**Fields per Record:    64K**

**Keys/Indexes per File:n/a**

**Key Size:             n/a**

**Memo fields per File: n/a**

**Memo Field Size:      n/a**

**Open Data Files:      Operating system dependent**