Différences

Ci-dessous, les différences entre deux révisions de la page.

--- back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_40 [2023/01/10 11:55] – supprimée - modification externe (Unknown date) 127.0.0.1
+++ back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_40 [2023/01/16 17:54] (Version actuelle) – modification externe 127.0.0.1
@@ Ligne 1: / Ligne 1: @@
+====== INT 0x21 - 0x40 - Write To File or Device Using Handle ======
+===== Request/Call: =====
+{{tablelayout?rowsHeaderSource=Auto&colwidth=""}}
+^  reg  ^  value  ^  descr  ^
+|  AH   |  0x40   |         |
+|  BX   |     | File Handle |
+|  CX    |    | number of bytes to write, a zero value truncates/extends the file to the current file position |
+|  DS:DX  | pointer to data buffer to write |
+===== Return: =====
+** CF cleared : success **
+{{tablelayout?rowsHeaderSource=Auto&colwidth=""}}
+^  reg  ^   descr  ^
+|  AX   | number of written bytes |
+** CF Set: error **
+{{tablelayout?rowsHeaderSource=Auto&colwidth=""}}
+^  reg  ^   descr  ^
+|  AX   | error code (see (see [[back2root:ibm-pc-ms-dos:hardware:informations:dos_error_code|DOS Error Code]])) |
+===== Notes & Comments =====
+<WRAP round box>
+  * if AX is not equal to CX on return, a partial write occurred
+  * this function can be used to truncate a file to the current file position by writing zero bytes
+</WRAP>
+[[start|Back]]

Nox-Rhea WiKi