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<TITLE>Int 21/AH=3Fh
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Int 21/AH=3Fh - DOS 2+ - READ - READ FROM FILE OR DEVICE -
AH = 3Fh
BX = file handle
CX = number of bytes to read
DS:DX - buffer for data
Return: CF clear if successful
AX = number of bytes actually read (0 if at EOF before call)
CF set on error
AX = error code (05h,06h) (see #01680 at AH=59h/BX=0000h)
Notes: data is read beginning at current file position, and the file position
is updated after a successful read
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<h2>Int 21/AH=3Fh
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<h3><font color=#C00040>DOS 2+ - READ - READ FROM FILE OR DEVICE</font></h3>
<PRE>
AH = 3Fh
BX = file handle
CX = number of bytes to read
DS:DX -> buffer for data<br>
<p><b>Return:</b><br>CF clear if successful
AX = number of bytes actually read (0 if at EOF before call)
CF set on error
AX = error code (05h,06h) <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01680 at AH=59h/BX=0000h)
</PRE>
<p><b>Notes:</b>
Data is read beginning at current file position, and the file position
is updated after a successful read.
The returned AX may be smaller than the request in CX if a partial
read occurred.
If reading from CON, read stops at first CR.
Under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
<p><b>BUG:</b>
Novell NETX.EXE v3.26 and 3.31 do not set CF if the read fails due to
a record lock (see AH=5Ch), though it does return AX=0005h; this
has been documented by Novell
<p><b>See Also:</b>
<a href="rb-2683.htm" tppabs="http://www.ctyme.com/intr/rb-2683.htm">AH=27h</a> - <a href="rb-2791.htm" tppabs="http://www.ctyme.com/intr/rb-2791.htm">AH=40h</a> - <a href="rb-3268.htm" tppabs="http://www.ctyme.com/intr/rb-3268.htm">AH=93h</a> - <a href="rb-4312.htm" tppabs="http://www.ctyme.com/intr/rb-4312.htm">INT 2F/AX=1108h</a>
<p>
<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
DOS Kernel</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
- <a href="alpha-d.htm" tppabs="http://www.ctyme.com/intr/alpha-d.htm">
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